JP2005256659A - Pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a pump maintaining stability of sliding between a first seal member and a second seal member and excellent in seal reliability. <P>SOLUTION: This has a construction comprising a pump housing 1 with an intake passage 2 and a discharge passage 3 formed in range with each other via a seal chamber 4, an impeller 5 attached to a shaft 6 of a motor and disposed in the seal chamber 4, the first seal member 7 rotated by rotation of the shaft 6, the second seal member 8 attached to an inner wall of the seal chamber 4, forming a seal sliding surface with the first seal member 7 and isolating the seal chamber 4 from the atmosphere, a supply fluid passage 13 connecting the seal chamber 4 and the discharge passage 3 for introducing a part of fluid flowing through the discharge passage 3 into the seal chamber 4 and a fluid dispersion jet member 15 disposed near an outer periphery of the seal sliding surface, forming a space on an outer peripheral wall side with which the feed fluid passage 13 communicates and having jet holes 17 formed at a plurality of positions and extending through from an outer peripheral wall to an inner peripheral wall for jetting the fluid introduced in the seal chamber 4 toward the seal sliding surface. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pump, and more particularly to a pump seal that applies pressure to a fluid.

  In a conventional pump, an impeller fixed to a rotating shaft of a motor is arranged in a pump chamber connected to a suction passage and a discharge passage, and the pump chamber is partitioned from the atmosphere by a mechanical seal. The mechanical seal is composed of a stationary sliding ring attached to the housing via a packing and a rotating sliding ring that is pressed against the stationary sliding ring by a spring and rotates with the rotation of the impeller. The moving ring is fixed via a packing to a rotating shaft of a motor that rotates the impeller. Then, the stationary side sliding ring and the rotating side sliding ring are pressed against each other to prevent water leakage. Furthermore, it is common to provide a fluid path for introducing a part of the fluid to be fed into the mechanical seal sliding part from the discharge passage of the housing at one location by a pressure difference.

  Hereinafter, a conventional pump will be described with reference to FIGS.

  Here, FIG. 5 is a cross-sectional view showing a state in which a conventional pump is in water-flow operation, and FIG. 6 is a cross-sectional view showing a jet port viewed from the axial direction of the shaft of the mechanical seal stationary side sliding ring in the pump of FIG. It is.

  As shown in FIGS. 5 and 6, the first housing portion 1-a and the second housing portion 1-b are combined to constitute the pump housing 1. A suction passage 2 and a discharge passage 3 are formed in the pump housing 1 through the mechanical seal chamber 4. The mechanical seal chamber 4 is provided with an impeller 5 that is attached to a motor shaft 6 and has a communication passage 5 a that connects the suction passage 2 and the discharge passage 3.

  In the mechanical seal chamber 4, a mechanical seal rotating side sliding ring 7 and a mechanical seal stationary side sliding ring 8 for isolating the mechanical seal chamber 4 from the atmosphere are attached adjacent to each other. Here, the mechanical seal rotating side sliding ring 7 is held by a mechanical seal rotating side sliding ring fixing packing 10 fitted to the shaft 6, and the mechanical seal stationary side sliding ring 8 is positioned around the shaft 6. The mechanical seal stationary side sliding ring fixing packing 9 attached to the inner wall of the mechanical seal chamber 4 is held. A washer 18 is fixed to the impeller 5 side of the shaft 6. The mechanical seal rotating side sliding ring 7 and the mechanical seal stationary side sliding ring 8 are pressed against each other by the pressing force of the pressing spring 14 fitted between the washer 18 and the mechanical seal rotating side sliding ring fixing packing 10. To be slid. Therefore, the contact surface between the mechanical seal rotating side sliding ring 7 and the mechanical seal stationary side sliding ring 8 becomes the seal sliding surface.

  A feed fluid passage 13 is formed in the pump housing 1 so as to communicate the vicinity of the mechanical seal stationary side sliding ring 8 of the mechanical seal chamber 4 and the vicinity of the outlet of the discharge passage 3. The fluid inlet 11 and the mechanical seal chamber 4 side serve as a supply fluid ejection port 12.

  Next, the operation of the pump having such a configuration will be described.

As shown in these drawings, when the shaft 6 rotates, the impeller 5 fixed to the shaft 6 also rotates. Then, the water that has entered from the suction passage 2 is stirred by the impeller 5 in the mechanical seal chamber 4, and the water around the impeller 5 moves from the center toward the outside.

  At this time, the rotation of the impeller 5 gives centrifugal force to the water, and the water flow introduced into the impeller 5 is increased in pressure to create a high-pressure area outside the impeller 5. Is generated. Further, since a high pressure area is generated outside the impeller 5, a negative pressure is generated in the mechanical seal chamber 4. Accordingly, a part of the water to the discharge passage 3 passes through the supply fluid passage 13 from the supply fluid inlet 11 of the discharge passage 3 and is guided to the mechanical seal chamber 4 from the supply fluid ejection port 12.

  And the heat | fever which generate | occur | produces by the rotational friction in the seal sliding surface of the mechanical seals 7 and 8 is cooled with the water which flowed in from the feed fluid jet nozzle 12, and the said sliding surface is stabilized.

  Furthermore, the negative pressure generated in the mechanical seal chamber 4 is reduced, and the vibration of the impeller 5 due to the pressure difference is reduced.

Such pumps are described in, for example, Japanese Utility Model Publication No. 62-38497 and Japanese Utility Model Application Publication No. 62-111994.
Japanese Utility Model Publication No. 62-38497 Japanese Utility Model Publication No. 62-111994

  However, according to the above-described conventional technology, since a part of the supply fluid is introduced from the discharge passage to the seal sliding portion of the mechanical seal chamber using the pressure difference, the lubricity of the seal sliding portion is Although it is possible to reduce and eliminate problems such as wear and heat generation of the seal sliding portion, the feed fluid is introduced to the seal sliding portion at one location, so the entire seal sliding surface and the entire circumference of the seal The pressure is not evenly applied, wears unevenly or the water pressure from one direction of the feed fluid shifts the sliding ring on the rotating side of the mechanical seal, resulting in poor slidability and shortening the life of the mechanical seal. Occurs.

  In general, the impeller rotates while being pulled toward the suction passage side by a force pulled toward the suction passage side. However, when air bubbles enter from the suction passage, the force with which the impeller is pulled toward the suction passage becomes weak, and the balance with the force drawn toward the mechanical seal is lost, causing abnormal vibration, and the mechanical seal seal slides. An abnormal vibration load is applied to the moving surface, and wear of the sliding surface is promoted. Also, when water is supplied after air bubbles enter from the suction passage, the seal sliding surface is deviated by the water flow from one direction because the jet port of the supply fluid to the seal sliding surface is biased from one place. Failure occurs, uneven wear of the sliding surface of the seal occurs, roughening of the sliding surface of the seal occurs, resulting in a short life of the mechanical seal and water leakage.

  In this case, when the impeller rotates at a high speed, the force attracted to the mechanical seal side becomes very large, and these problems occur at an accelerated rate.

  Then, an object of this invention is to provide the pump excellent in sealing reliability.

In order to solve this problem, a pump according to the present invention includes a pump housing in which a suction passage and a discharge passage are connected to each other via a seal chamber, and a blade attached to the shaft of the motor and disposed in the seal chamber. A seal sliding surface is formed between the vehicle, a first seal member attached to the shaft in the seal chamber and rotated by rotation of the shaft, and an inner wall of the seal chamber, and a seal sliding surface is formed between the first seal member and the seal A second seal member that isolates the chamber from the atmosphere, a feed fluid passage that connects the seal chamber and the discharge passage, and introduces a part of the fluid flowing through the discharge passage into the seal chamber, and the vicinity of the outer periphery of the seal sliding surface And a space through which the feed fluid passage communicates on the outer peripheral wall side, and the fluid that penetrates from the outer peripheral wall to the inner peripheral wall and is introduced into the seal chamber is ejected toward the seal sliding surface. Holes is obtained by a structure having a fluid distribution ejection member formed at a plurality of locations.

  In a preferred embodiment of the present invention, the ejection holes are formed at a predetermined angle with respect to the radial direction of the shaft.

  In a further preferred embodiment of the present invention, the ejection hole has a diameter that increases toward the ejection direction.

  According to the present invention, the water introduced into the seal chamber flows out from the plurality of ejection holes formed in the fluid dispersion ejection member to the entire periphery of the seal sliding surface with a uniform force. An effective effect that the sliding with the second seal member can be stably maintained is obtained.

  In addition, according to the present invention, there is no problem that the seal sliding surface is displaced due to a biased water flow, so that the sliding surface is not easily roughened due to uneven wear or displacement of the seal member, and the seal member has a short service life. An effective effect of suppressing the cause of water leakage and water leakage can be obtained.

  Thereby, the effective effect that the seal reliability of a pump improves is acquired.

  According to a first aspect of the present invention, there is provided a pump housing in which a suction passage and a discharge passage are connected to each other via a seal chamber, an impeller mounted on a motor shaft and disposed in the seal chamber. A seal sliding surface is formed between the first seal member attached to the shaft in the seal chamber and rotated by the rotation of the shaft and the inner wall of the seal chamber, and a seal sliding surface is formed between the first seal member and the seal chamber. Arranged in the vicinity of the outer periphery of the seal sliding surface, a second sealing member that is isolated from the atmosphere, a supply fluid passage that connects the seal chamber and the discharge passage, and introduces a part of the fluid flowing through the discharge passage into the seal chamber In addition, there are a plurality of ejection holes that form a space that communicates with the supply fluid passage on the outer peripheral wall side and that ejects fluid introduced into the seal chamber through the outer peripheral wall to the inner peripheral wall toward the seal sliding surface. Number And a fluid dispersion jet member formed on the sliding surface, which can stably maintain sliding between the first seal member and the second seal member, and a sliding surface caused by uneven wear or displacement of these seal members. As a result, it is difficult to cause roughening, and thus a pump having excellent sealing reliability can be obtained.

  The invention according to claim 2 of the present invention is the pump according to claim 1, wherein the ejection hole is formed at a predetermined angle with respect to the radial direction of the shaft, and the seal sliding surface side Since the squirting water flow does not directly hit the seal sliding surface, and this squirting water flow rotates around the first and second sealing members, it is possible to further suppress the occurrence of displacement of the sealing sliding surface. Have.

  The invention according to claim 3 of the present invention is the pump according to claim 1 or 2, wherein the ejection hole is a pump whose diameter is expanded in the ejection direction, and the discharge flow velocity from the ejection hole becomes slow. And, it has the effect that the occurrence of the displacement of the seal sliding surface can be further suppressed.

(Embodiment 1)
Hereinafter, the best mode for carrying out the present invention will be described more specifically with reference to the drawings. Here, in the accompanying drawings, the same reference numerals are given to the same members, and duplicate descriptions are omitted. In addition, since description here is the best form by which this invention is implemented, this invention is not limited to the said form.

  FIG. 1 is a cross-sectional view showing a state during a water flow operation in a pump according to an embodiment of the present invention, and FIG. 2 is a jet port viewed from the axial direction of a shaft of a mechanical seal stationary side sliding ring in the pump of FIG. FIG. 3 is a cross-sectional view showing an example of a jet port viewed from the axial direction of the shaft of the stationary ring on the stationary side of the mechanical seal in the pump of FIG. 1, and FIG. 4 is a mechanical view of the mechanical pump in the pump of FIG. It is sectional drawing which shows another example of the jet nozzle seen from the axial direction of the shaft of the seal stationary side sliding ring.

  As shown in FIGS. 1 and 2, the pump of the present embodiment includes a pump housing 1 in which a first housing part 1-a and a second housing part 1-b are crimped and fitted by welding or screwing. Is configured. A suction passage 2 and a discharge passage 3 are formed in the pump housing 1 through a mechanical seal chamber (seal chamber) 4. The mechanical seal chamber 4 is provided with an impeller 5 that is attached to a motor shaft 6 and has a communication passage 5 a that connects the suction passage 2 and the discharge passage 3.

  The entrance through which water (fluid) enters the impeller 5 from the suction passage 2 has a shape that matches the shape of the water inlet of the impeller 5. Further, the fitting portion between the first housing portion 1-a and the second housing portion 1-b is fitted through a rubber packing in order to prevent water leakage.

  In the mechanical seal chamber 4, two mechanical seals 7 and 8 for isolating the mechanical seal chamber 4 from the atmosphere, that is, a mechanical seal rotating side sliding ring (first seal member) 7 and a mechanical seal stationary side slide are provided. A moving ring (second seal member) 8 is slidably attached with the surfaces in contact with each other as seal sliding surfaces. Here, the mechanical seal rotation side sliding ring 7 is elastically fixed to a mechanical seal rotation side sliding ring fixing packing 10 fitted in the shaft 6. The mechanical seal stationary side sliding ring 8 is press-fitted and fixed to a mechanical seal stationary side sliding ring fixing packing 9 attached to the inner wall of the mechanical seal chamber 4 located around the shaft 6 to prevent water leakage. Yes.

  A washer 18 is fixed to the impeller 5 side of the shaft 6. The mechanical seal rotating side sliding ring 7 and the mechanical seal stationary side sliding ring 8 are pressed against each other by the pressing force of the pressing spring 14 fitted between the washer 18 and the mechanical seal rotating side sliding ring fixing packing 10. To be slid. Therefore, the contact surface between the mechanical seal rotating side sliding ring 7 and the mechanical seal stationary side sliding ring 8 becomes the seal sliding surface as described above. The mechanical seal rotating side sliding ring 7 rotates together with the shaft 6, the pressing spring 14, and the impeller 5 while being pressed against the mechanical seal stationary side sliding ring 8 at the seal sliding surface by the pressing spring 14.

  The shaft 6 has a flat surface for fixing one of the impeller 5 and the pressing spring 14, and the impeller 5 described above is fastened and fixed with a bolt. However, the flat surface for fixing the pressing spring 14 may be realized by inserting a washer.

  With the above configuration, the shaft 6, the impeller 5, the pressing spring 14, the mechanical seal rotation side sliding ring 7 and the mechanical seal rotation side sliding ring fixing packing 10 are rotated by the rotation of the shaft 6, and the mechanical seal stationary side slide is rotated. The mechanical seal stationary side sliding ring 8 that seals between the rotating ring sliding ring 7 and the mechanical seal by pressing the moving ring fixing packing 9 and the pressing spring 14 prevents water leakage from each pressure contact joint. .

  A feed fluid passage 13 is formed in the pump housing 1 so as to communicate the vicinity of the mechanical seal stationary side sliding ring 8 of the mechanical seal chamber 4 and the vicinity of the outlet of the discharge passage 3. The fluid inlet 11 and the mechanical seal chamber 4 side serve as a supply fluid ejection port 12.

  As shown in detail in FIG. 2, in the vicinity of the outer periphery of the seal sliding surface of the mechanical seals 7 and 8, there are a plurality of ejection holes 17 penetrating from the outer peripheral wall to the inner peripheral wall (here, four at equal intervals in the circumferential direction). The fluid dispersion jetting member 15 formed at the location is formed with an annular space communicating with the feed fluid jet port 12 of the feed fluid passage 13 on the outer peripheral wall side and fixed by press-fitting or screwing.

  Next, the operation of the pump having such a configuration will be described.

  The impeller 5 fixed to the shaft 6 is rotated by the rotation of the shaft 6. Then, the rotation of the impeller 5 gives a centrifugal force to the water that flows in, and the water flow introduced into the impeller 5 is boosted by the impeller 5 to generate a radially high pressure area on the outer periphery of the impeller 5. Then, the water in the vicinity of the impeller 5, the pump housing 1, and the fluid dispersion jetting member 15 is drawn by the outflow water toward the outer periphery of the impeller 5, and passes through the gap between the impeller 5 and the fluid dispersion jetting member 15. A flow that flows out to the outer peripheral portion of the gas is generated. As a result, the water in the mechanical seal chamber 4 flows out between the fluid dispersion jetting member 15 and the impeller 5.

  Therefore, a part of the water to the discharge passage 3 is formed on the outer peripheral wall side of the fluid dispersion jet member 15 from the feed fluid outlet 12 through the feed fluid passage 11 from the feed fluid inlet 11 of the discharge passage 3. It flows into the annular space of the mechanical seal chamber 4. And it ejects toward the mechanical seals 7 and 8 from the ejection hole 17 formed in this fluid dispersion | distribution ejection member 15. FIG.

  The water ejected from the ejection holes 17 of the fluid dispersion ejection member 15 includes the side surfaces of the mechanical seal stationary side sliding ring 8 and the mechanical seal rotating side sliding ring 7, and the mechanical seal stationary side sliding ring 8 and the mechanical seal rotating side sliding. It flows into the seal sliding surface where the moving ring 7 is in pressure contact. The inflowing water cools the water in the mechanical seal chamber 4 heated by the frictional heat generated on the seal sliding surface, while the side surfaces of the mechanical seal stationary side sliding ring 8 and the mechanical seal rotating side sliding ring 7; The seal sliding surface where the mechanical seal stationary side sliding ring 8 and the mechanical seal rotating side sliding ring 7 are in pressure contact is cooled to stabilize the sliding surface, and at the same time, this seal sliding surface is lubricated. Further, the negative pressure generated in the mechanical seal chamber 4 is reduced, and the vibration of the impeller 5 due to the pressure difference is reduced.

  Then, the water flowing into the mechanical seal chamber 4 moves to the impeller 5 side of the fluid dispersion ejecting member 15, passes through the gap between the fluid dispersion ejecting member 15 and the impeller 5 on the mechanical seal chamber 4 side, and again is a suction passage. The water flows from 2 to the discharge passage 3 and flows out to the discharge passage 3.

  If no part of the discharged water is supplied and supplied to the mechanical seals 7 and 8, no water as a lubricant and coolant on the sliding surface of the seal will be lost. The life of the seals 7 and 8 will be extremely impaired.

  Here, as shown in FIG. 2, the water introduced into the mechanical seal chamber 4 from the supply fluid ejection port 12 passes through the four ejection holes 17 formed in the fluid dispersion ejection member 15 to the mechanical seals 7 and 8. Since it flows out to the entire circumference of the seal sliding surface with a uniform force, no water flow is generated from one direction that causes the mechanical seal rotating side sliding ring 7 to be laterally displaced, and the mechanical seal stationary side sliding ring 8 and the mechanical seal rotating side Sliding with the sliding ring 7 can be kept stable.

  In addition, there is no problem that the sliding surface of the seal is displaced due to an uneven water flow, the sliding surface of the mechanical seals 7 and 8 is hardly worn and the roughening of the sliding surface due to the shift is difficult, and the mechanical seals 7 and 8 are short. Longevity and cause of water leakage are suppressed.

  Therefore, even when the impeller 5 rotates at a high speed and the force attracted toward the mechanical seals 7 and 8 becomes very large, the occurrence of the above-described problem is suppressed.

  Thus, according to this embodiment, since water is supplied from a plurality of locations to the seal sliding surfaces of the mechanical seals 7 and 8, a pump having excellent seal reliability with the mechanical seals 7 and 8 can be obtained. Can do.

  Here, as shown in FIG. 3, the ejection holes 17 formed in the annular fluid dispersion ejection member 15 are formed to be inclined by, for example, 30 degrees with respect to the radial direction of the shaft 6. The angle is preferably as large as 90 degrees, but a range of 20 to 60 degrees is practical considering the ease of manufacturing. However, the inclination angle can be set freely.

  By forming the ejection holes 17 so as to be inclined in this manner, the jet water flow to the seal sliding surface side does not directly hit the seal sliding surface, and this jet water flow rotates around the mechanical seals 7 and 8. Furthermore, the occurrence of displacement of the seal sliding surface can be suppressed.

  Further, as shown in FIG. 4, the ejection holes 17 formed in the annular fluid dispersion ejection member 15 are formed to be inclined by, for example, 30 degrees with respect to the radial direction, and the diameter is further expanded toward the ejection direction.

  In this way, in addition to the case shown in FIG. 3, the discharge flow rate from the ejection hole 17 becomes slower, so that the occurrence of displacement of the seal sliding surface can be further suppressed.

  In addition, although the flow of water can be made gentle, so that the opening magnification of the ejection hole 17 in the fluid dispersion | distribution ejection member 15 is large, the relevance with the path | route, magnitude | size, and shape of the supply fluid channel | path 13 is also large. In the present embodiment, the diameter of the feeding fluid passage 13 is 2 mm, the cross-sectional shape of the ejection hole 17 formed in the fluid dispersion ejection member 15 is a rectangular parallelepiped of 2 mm × 4 mm, the entrance of the ejection hole 17 is a 1 mm circular tube, The outlet was 3 mm. Thereby, the impact by the water flow to the seal sliding face vicinity of the mechanical seals 7 and 8 is reduced, and generation | occurrence | production of this seal | sticker sliding face can be suppressed.

  The present invention relates to a technique effective when applied to a seal member of a pump that applies pressure to a fluid.

Sectional drawing which shows the state in the water flow driving | operation in the pump which is one embodiment of this invention Sectional drawing which shows an example of the jet nozzle seen from the axial direction of the shaft of the mechanical seal stationary side sliding ring in the pump of FIG. Sectional drawing which shows another example of the jet nozzle seen from the axial direction of the shaft of the mechanical seal stationary side sliding ring in the pump of FIG. Sectional drawing which shows another example of the jet nozzle seen from the axial direction of the shaft of the mechanical seal stationary side sliding ring in the pump of FIG. Sectional drawing which shows the state in the water pumping operation in the conventional pump Sectional drawing which shows the jet nozzle seen from the axial direction of the shaft of the mechanical seal stationary side sliding ring in the pump of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pump housing 1-a 1st housing part 1-b 2nd housing part 2 Suction passage 3 Discharge passage 4 Mechanical seal chamber (seal)
5 Impeller 6 Shaft 7 Mechanical seal rotating side sliding ring (first seal member)
8 Mechanical seal stationary side sliding ring (second seal member)
9 Mechanical seal stationary side sliding ring fixing packing 10 Mechanical seal rotation side sliding ring fixing packing 11 Feed fluid inlet 12 Feed fluid ejection port 13 Feed fluid passage 14 Press spring 15 Fluid dispersion ejection member 17 Ejection hole 18 Washer

Claims (3)

A pump housing in which a suction passage and a discharge passage are connected to each other via a seal chamber;
An impeller mounted on the shaft of the motor and disposed in the seal chamber;
A first seal member attached to the shaft in the seal chamber and rotated by rotation of the shaft;
A second seal member attached to the inner wall of the seal chamber, forming a seal sliding surface with the first seal member and isolating the seal chamber from the atmosphere;
A feed fluid passage that communicates the seal chamber with the discharge passage and introduces a part of the fluid flowing through the discharge passage into the seal chamber;
A space that is disposed in the vicinity of the outer periphery of the seal sliding surface and that communicates with the supply fluid passage is formed on the outer peripheral wall side, and the fluid that penetrates from the outer peripheral wall to the inner peripheral wall and is introduced into the seal chamber. A pump comprising: a fluid dispersion ejection member having ejection holes ejected toward the seal sliding surface formed at a plurality of locations. The pump according to claim 1, wherein the ejection hole is formed at a predetermined angle with respect to a radial direction of the shaft. The pump according to claim 1, wherein the ejection hole has a diameter that increases in the ejection direction.

Images