JP4423803B2 - Horizontal shaft type pump - Google Patents

Description

表１で明らかなように、水潤滑においてＰＥＥＫ系樹脂を用い、二層ステンレス鋼や超硬合金との組み合わせにより、５ＭＰａ以上の極めて高い限界面圧が得られ、試験後摺動面の観察結果で回転側損傷及び固定側損傷の何れも無いことが認められた。特に、超硬合金被膜とＰＥＥＫ系樹脂との組み合わせにおいては、試験片Ｎｏ．２で明らかなように７ＭＰａという極めて高い限界面圧（試験片Ｎｏ．１の二層ステンレス鋼とＰＥＥＫ系樹脂との組み合わせによる限界面圧５ＭＰａに比較してさらに４０％も高い限界面圧）が得られた。なお、二層ステンレス鋼はビッカース硬度が６００以上のもので、超硬合金被膜は耐食性を有するニッケルバインダー系の超硬合金を用いた。
【００３０】
また、熱可塑性樹脂材４ａ２、４ｂ２、４ｃ２を形成するＰＥＥＫ系樹脂にカーボン繊維を混合させることにより、熱可塑性樹脂材４ａ２、４ｂ２、４ｃ２の機械的強度が向上すると共に、このカーボン繊維部が水溜めになり格段に優れた潤滑効果が発揮されることが分かった。
【００３１】
図４に本発明の第２実施例を示す。本実施例において、上述した第１実施例と異なる点は以下の通りである。
【００３２】
本実施例は、摺動面に耐食性の超硬合金被膜１３ａを有するスリーブ１３がポンプ主軸１に固定されると共に、スラストカラー５の両側摺動面に耐食性の超硬合金被膜１３ｂが被覆されている点にて、第１実施例と相違している。このスリーブ１３は、ＳＵＳ３０４製であり、ラジアル軸受４ａの位置する部分にラジアル軸受４ａより若干長く装着され、回り止め（図示せず）によりポンプ主軸１に固定されている。スリーブ１３のその表面には耐食性の超硬合金被膜１３ａが被覆されている。
【００３３】
本実施例によれば、スリーブの表面１３ａが万一損傷を受けた場合には、スリーブ１３のみの交換で済み、主軸そのものを交換する場合に比較して交換費用を安く済ませることができる。また、表１から明らかなように、スリーブ１３及びスラストカラー５の表面に耐食性の超硬合金被膜１３ａ、１３ｂが施されているので、損傷を受け難く、表面が変形し難いことにより、耐荷重性が格段に向上する。そして、超硬合金と熱可塑性樹脂の組み合わせているので、なじみ性が良好となり、スリーブ１３及び軸受４ａの摺動面の粗さが小さく滑らかになっていく。このため、起動直後から水膜形成が良好となり、耐荷重性の改善が図られる。なお、本実施例では超硬合金被膜を耐食性金属（ＳＵＳ３０４等）に施した場合について説明したが、超硬合金被膜１３ａ、１３ｂの代わりに超硬合金ソリッドを用いても良い。また、超硬合金の材質は耐食性を有するニッケルバインダー系の超硬合金が望ましい。
【００３４】
図５に本発明の第３実施例を示す。本実施例において、上述した第１実施例と異なる点は以下の通りである。
【００３５】
本実施例は、スラストカラー５をポンプ主軸１の端部の溝に直接嵌め込んで固定し、熱可塑性樹脂のみで構成されたラジアル軸受４ａの端面をスラストカラー５に摺動可能としている点にて、第１実施例と相違するものである。本実施例によれば、ラジアル軸受４ａがスラスト軸受を兼ねているので、構成が簡単で安価なものとすることができる。
【００３６】
図６に本発明の第４実施例を示す。本実施例において、上述した第３実施例と異なる点は以下の通りである。
【００３７】
本実施例は、横軸排水ポンプであり、ポンプケーシング３の中に一方のラジアル軸受４ａを設置し、ポンプ主軸１の他端側のポンプケーシング３の側面部分に他方のラジアル軸受４ａとスラスト軸受４ｂ、４ｃを設置した点にて、第３実施例と相違している。この横軸排水ポンプは、ポンプ主軸１に羽根２が固定され、この羽根２の外周を囲むようにポンプケーシング３が設けられ、ラジアル軸受４ａがポンプケーシング３の中に設置され、残りのラジアル軸受４ａとスラスト軸受４ｂ、４ｃがポンプケーシング３側に固定されている。さらに、ポンプケーシング３側の軸受４ａ、４ｂ、４ｃに揚水を使用するための配管１４を吐出側に接続している。即ち、他側のラジアル軸受４ａの一方の側をポンプケーシング３の吸込み側通路に連通すると共に、このラジアル軸受４ａの他方の側でかつスラスト軸受４ｂ、４ｃにポンプケーシング３の吐出側通路を連通している。この種のポンプの場合、通常の運転ではポンプケーシング３側に設けた軸受部４ａ、４ｂ、４ｃが負圧状態となり揚水が供給されないので、吐出側に接続した配管１４によりスラスト軸受４ｂとシール７の間に揚水を供給する。運転に際しては、起動前にポンプケーシング３の中を揚水で充満させ、充満後に起動して排水運転を始める。
【００３８】
本実施例では、ポンプケーシング側に設けた軸受部４ａ、４ｂ、４ｃに揚水を確実に供給することができるので、上述した両吸込み渦巻きポンプと同様に、揚水による直接潤滑でき、長期間安定した性能が維持できると共に高信頼性の横軸排水ポンプが得られる。
【００３９】
【発明の効果】
本発明によれば、メンテナンスフリーでしかも長期間安定して運転できると共に、ラジアル軸受の片当たりによる損傷を防止ができる信頼性の高い横軸型ポンプを得ることができる。
【００４０】
また、本発明によれば、メンテナンスフリーで高速回転時の振動を低減してポンプの小型高速化及び効率向上を図ることが可能な横軸型ポンプを得ることができる。
【図面の簡単な説明】
【図１】本発明の第１実施例を示す両吸込み渦巻きポンプの縦断面図である。
【図２】図１の両吸込み渦巻きポンプの一側の軸受部の拡大図である。
【図３】図１の両吸込み渦巻きポンプの他側の軸受部の拡大図である。
【図４】本発明の第２実施例を示す両吸込み渦巻きポンプの軸受部の縦断面図ある。
【図５】本発明の第３実施例を示す両吸込み渦巻きポンプの縦断面図である。
【図６】本発明の第４実施例を示す横軸排水ポンプの縦断面図である。
【符号の説明】
１…ポンプ主軸、２…羽根、３…ポンプケーシング、３ａ…軸受支持部、４ａ…ラジアル軸受、４ａ０…裏金、４ａ１…焼結フィルター、４ａ２…熱可塑性樹脂材、４ｂ、４ｃ…スラスト軸受、４ｂ０、４ｃ０…裏金、４ｂ１、４ｃ１…焼結フィルター、４ｃ２、４ｃ２…熱可塑性樹脂材、５…スラストカラー、６…ケーシングカバー、７…シール、８…つば部、９…ナット、１２…溝、１３…スリーブ、１３ａ、１３ｂ…超硬合金皮膜、１５…ボルト、１６…カップリング部、１７…ケーシングカバー。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a horizontal axis type pump, and is particularly suitable for a horizontal axis type pump used as a pump for drainage of rainwater or water supply.
[0002]
[Prior art]
This type of horizontal shaft pump includes a double suction centrifugal pump and a horizontal shaft drain pump. As a conventional double suction centrifugal pump, a pump main shaft with fixed blades, a pump casing that surrounds the outer periphery of the blade to form a water passage, and bearings that support the pump main shaft on both sides of the fixed portion of the blades are provided. The bearing on one side is formed of a ceramic radial bearing consisting of a sliding bearing that is lubricated by pumping water, and is held by the side facing the water passage of the pump casing, and the bearing on the other side is oil-lubricated white metal or grease-lubricated. There is a structure in which a radial bearing composed of a rolling bearing and a thrust bearing arranged in parallel therewith are configured to be held at a position away from the pump casing (Prior Art 1). For example, Japanese Patent Application Laid-Open No. 9-137795 is available.
[0003]
Further, as a conventional horizontal axis drainage pump, a pump main shaft with fixed blades, a pump casing that surrounds the outer periphery of the blades to form a water passage, and bearings that support the pump main shaft on both sides of the fixed portions of the blades. The bearing on one side is made of a ceramic radial bearing consisting of a sliding bearing lubricated by pumping water and held in the pump casing, and the other bearing is made of oil lubricated white metal or grease lubricated rolling bearing. There is a structure that is formed by a radial bearing and a thrust bearing arranged in parallel therewith and is held at a position away from the pump casing (prior art 2). For example, Japanese Patent Application Laid-Open No. 11-93985 is related to this.
[0004]
[Problems to be solved by the invention]
However, since the conventional bearings 1 and 2 use radial bearings made of oil-lubricated white metal or grease-lubricated rolling bearings on the other side, the lubricating oil and grease used in the bearings are regularly replaced. Therefore, it is difficult to make maintenance-free, and there is a risk that the lubricating oil or grease may leak and contaminate the surroundings.
[0005]
Further, in the prior arts 1 and 2, since the other bearing is held at a position away from the pump casing, the radial support span between the two bearings becomes longer, and vibration during high-speed rotation is suppressed. However, it was difficult to reduce the size and speed.
[0006]
Furthermore, in the prior arts 1 and 2, because one side bearing is formed by a ceramic radial bearing consisting of a sliding bearing lubricated by pumping water, it has excellent wear resistance. If the pump main shaft is tilted due to misalignment of the pump or due to fluid force during operation, the end of the ceramic radial bearing will come into contact with the pump main shaft, and if the contact condition is strong, local water film breakage will occur. As a result, both the pump main shaft and the radial bearing may be damaged.
[0007]
An object of the present invention is to obtain a highly reliable horizontal shaft type pump that is maintenance-free and that can be stably operated for a long period of time, and that can prevent damage due to contact of a radial bearing.
[0008]
Another object of the present invention is to obtain a horizontal shaft type pump that is maintenance-free and that can reduce vibration during high-speed rotation, thereby enabling a reduction in size and speed and improvement in efficiency of the pump.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a horizontal shaft type pump that is one of the representative inventions of the present invention includes a pump main shaft to which a blade is fixed, a pump casing that surrounds the outer periphery of the blade and forms a water passage, In a horizontal shaft type pump comprising a bearing that supports the pump main shaft on both sides of a portion to which the blades are fixed, a thrust collar fixed to the pump main shaft, and a casing cover fixed to a side surface of the pump casing , The bearing on one side is a sliding bearing and is formed by a radial bearing having a groove, and the bearing on the other side is a sliding bearing , and is on both sides of the radial bearing having a groove and the thrust collar. It is formed in the thrust bearing provided in a space of the through the casing cover communicating with the water channel through the groove side of the radial bearing, heat Allowed the sliding portion of the two radial bearings And forming at RESIN, which is constituted so as to use the pumping of the pump as a lubricant of the all bearings.
[0010]
In order to achieve the above-mentioned another object, a horizontal shaft type pump, which is one of the representative inventions of the present invention, includes a pump main shaft to which blades are fixed, and a pump casing that surrounds the outer periphery of the blade to form a water passage. A horizontal shaft pump comprising: a bearing that supports the pump main shaft on both sides of a portion to which the blades are fixed; a thrust collar fixed to the pump main shaft; and a casing cover fixed to a side surface of the pump casing. The one side of the bearing is a sliding bearing and is formed of a radial bearing having a groove, and the other side of the bearing is a sliding bearing, the radial bearing having a groove and both sides of the thrust collar, the formed through the grooves of the other side of the radial bearing in the thrust bearing provided in a space of the through the casing cover communicating with the water channel, the said other side of the radial bearing Pump and maintained at a water passage portion of the casing, which is constituted so as to use the pumping of the pump as a lubricant of the all bearings.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In the second and subsequent embodiments, the duplicate description of the configuration common to the first embodiment is omitted. In addition, the same code | symbol in the figure of each Example shows the same thing or an equivalent.
[0012]
First, a first embodiment of the present invention will be described with reference to FIGS. 1 is a longitudinal sectional view of a double suction centrifugal pump showing a first embodiment of the present invention, FIG. 2 is an enlarged view of a bearing portion on one side of the double suction centrifugal pump of FIG. 1, and FIG. 3 is a double suction spiral of FIG. It is an enlarged view of the bearing part of the other side of a pump.
[0013]
The double suction centrifugal pump constituting the horizontal shaft type pump is used, for example, as a pump for rainwater drainage or water supply, and includes a pump main shaft 1, a blade 2, a pump casing 3, a radial bearing 4a, and a thrust bearing 4b. 4c, thrust collar 5, casing cover 6, seal 7 and the like.
[0014]
The pump main shaft 1 formed of double-layer stainless steel is horizontally supported by a pump casing 3 via a bearing, and one end portion projects outward from the pump casing 3. A coupling portion 16 connected to the drive mechanism is attached to the one end portion. The blade 2 is fixed to the outer periphery of the central portion of the pump main shaft 1 and rotates together with the pump main shaft 1 so as to suck water from both sides and discharge it in the outer peripheral direction. The pump casing 3 is provided so as to surround the outer periphery of the blade 2, and bearing support portions 3a are provided on both side surfaces facing the water passage. Bearings 4 a, 4 b, 4 c that support the pump main shaft 1 are disposed on both sides of the blade 2.
[0015]
Two radial bearings 4 a configured by cylindrical slide bearings are fixed in close contact with bearing support portions 3 a provided on both side surface portions of the pump casing 3, and portions positioned on both sides of the blade 2 of the pump main shaft 1. It is supported so that it can rotate and slide. The pump casing portion located on the water passage side (inner side) of the radial bearing 4a has a gap with the pump main shaft 1 so that the inner side of the radial bearing 4a communicates with the water passage in the pump casing 3. It is configured. As a result, the radial bearing 4 a is supplied with pumped water in the water passage in the pump casing 3. Further, the radial bearing 4a is provided with a plurality of grooves 12 (two in this embodiment) that are penetrated in the axial direction in the horizontal position. Thus, the pumped water is circulated from the water passage through the plurality of grooves, and the sliding surface of the radial bearing 4a is reliably lubricated.
[0016]
As shown in FIGS. 2 and 3, the radial bearing 4a is provided with a thermoplastic resin material 4a2 on the sliding surface, and specifically, on a back metal 4a0 (material: corrosion resistant material such as SUS316, SUS304). The sintered filter 4a1 (material: corrosion resistant material such as SUS316, SUS304, etc.) is joined with nickel braze or the like, and the thermoplastic resin material 4a2 is press-fitted onto the surface of the joined sintered filter 4a1 and attached using the anchor effect. Configured. For the thermoplastic resin material 4a2, a polyetheretherketone resin (hereinafter referred to as PEEK resin) in which carbon fibers are not mixed or mixed is used.
[0017]
Here, the resin layer 4a2 is formed only on the sliding surface to manufacture the radial bearing 4a. However, the radial bearing 4a is manufactured using only a resin ring, a resin pipe, or the like without using a back metal or the like, and the pump casing 3 is manufactured. You may make it attach directly to (refer FIG. 5 of 3rd Example). In addition, waterproofing is applied so that the pumped water penetrates between the back metal 4a0 and the sintered filter 4a1 and corrosion and pitting corrosion do not occur. In this waterproofing treatment, in the resin bearing, a coating film is formed with an adhesive or the like on the remaining portion excluding the sliding surface, thereby reliably preventing the entry of pumped water. The reliability can be further improved by fixing the corrosion-resistant metal plate after forming the coating film.
[0018]
The casing cover 17 is in close contact with the side surface of the pump casing 3 so as to close the outside of the radial bearing 4a and is detachably fixed with bolts or the like. The seal 7 is provided in order to prevent leakage of water from the gap between the pump main shaft 1 and the casing cover 17 to the outside.
[0019]
The radial bearing 4a on the coupling side shown in FIG. 2 and the radial bearing 4a on the other side shown in FIG. 3 have basically the same configuration, but the radial bearing 4a on the other side has a thrust bearing 4c on the back metal 4a0. The difference is that a flange portion 8 to be attached is formed.
[0020]
In FIG. 3, the casing cover 6 is in close contact with the side surface of the pump casing 3 so as to close the outer side of the radial bearing 4a and is detachably fixed by bolts or the like. The thrust collar 5 is a member that receives the thrust force of the thrust bearings 4b and 4c. The thrust collar 5 is disposed inside the casing cover 6 in contact with the other end surface of the pump main shaft 1, and is pumped by bolts 15 and nuts 9. It is fixed to the main shaft 1. Accordingly, the thrust collar 5 rotates together with the pump main shaft 1.
[0021]
Further, the thrust bearing 4 b is formed in a ring shape and is fixed inside the casing cover 6. The thrust bearing 4 b slides in contact with the left surface of the thrust collar 5 so as to receive the leftward thrust force of the pump main shaft 1. On the other hand, the thrust bearing 4c is formed in a ring shape and is fixed to the outside of the flange portion 8 of the back metal 4a0. The thrust bearing 4 c slides in contact with the right surface of the thrust collar 5 so as to receive the thrust force in the right direction of the pump main shaft 1. Thus, the thrust bearings 4b and 4c are disposed on both sides of the thrust collar 5 and are located outside the radial bearing 4a. The thrust bearings 4b and 4c are tapered land bearings having a tapered portion formed on the sliding surface. The number of taper portions, the width, and the like are set according to the magnitude of the thrust load. In addition, since the thrust bearing 4b is being fixed to the casing cover 6, the gap of a thrust direction can be adjusted easily.
[0022]
As shown in FIG. 3, the thrust bearings 4b and 4c are provided with thermoplastic resin materials 4b2 and 4c2 on the sliding surfaces. Specifically, the back metal 4b0 and 4c0 (materials: corrosion resistance such as SUS316 and SUS304). Sintered filters 4b1 and 4c1 (materials: corrosion resistant materials such as SUS316 and SUS304) are joined to the material) with nickel brazing or the like, and thermoplastic resin materials 4b2 and 4c2 are attached to the surface of the joined sintered filter 4a1. Has been.
[0023]
Further, the space in the casing cover 6 in which the thrust bearings 4b and 4c are disposed is communicated with the water passage in the pump casing 3 through the groove 12 formed in the radial bearing 4a, and pumped water is supplied. An air vent 11 is installed on the upper surface of the casing cover 6 so that bubbles do not remain in the space in the casing cover 6. The air vent 11 is opened when the pumped water before activation is filled and closed when the pumped water is filled. The pumped water that has passed through the groove 12 is guided to the thrust bearings 4b and 4c for lubrication.
[0024]
In the double suction centrifugal pump of this embodiment, pumping water is used as a lubricant for all the bearings 4a, 4b and 4c, so that the conventionally used lubricating oil and grease are no longer necessary and maintenance-free is realized. In addition, it is possible to eliminate environmental contamination due to leakage of lubricating oil and grease, and to make an environmentally friendly pump.
[0025]
Further, since the radial bearing 4a for supporting both sides of the pump main shaft 1 is held by the water passage portion of the pump casing 3, both radials are compared with the conventional bearing supported at a position away from the pump casing. The span between the bearings 4a can be reduced, and thereby the bearing support rigidity can be increased. As a result, vibration during high-speed rotation of the pump can be reduced, and the pump can be reduced in size and speed and the pump efficiency can be improved.
[0026]
Furthermore, since the sliding parts of both radial bearings 4a and thrust bearings 4b, 4c are formed of thermoplastic resin materials 4a2, 4b2, 4c2, conventional thermosetting resins (for example, under water lubrication using pumped water) The shape change due to swelling such as phenol resin) hardly occurs, a stable low coefficient of friction is obtained up to a high load region, and the initial bearing sliding surface shape can be maintained for a long period of time. Thereby, the reliability with respect to long-term driving | operation is improved significantly. Further, the thermoplastic resin materials 4a2, 4b2, and 4c2 forming the sliding portions of the radial bearings 4a and the thrust bearings 4b and 4c are locally ruptured by a single contact with the pump main shaft 1 in a high load region. Even if this occurs, the sliding surface softens and flows easily, and smoothing proceeds to stabilize the pump shaft 1 and the thrust collar 5 in a familiar state. Thus, since the thermoplastic resin materials 4a2, 4b2, and 4c2 easily flow when locally contacted, damage to the main shaft side and the thrust cover side can be prevented. Therefore, stable pump performance can be maintained, and high reliability is ensured over a long period of time.
[0027]
In order to confirm the effect of using thermoplastic resin materials 4a2, 4b2, 4c2 for bearing sliding parts, sliding element tests were conducted on various materials in combination with ring-shaped rotating side materials and ring-shaped fixed side materials. Pressure and sliding surface damage were examined. As operating conditions, six radial grooves for water lubrication are formed on the fixed side material, and water is flowed through the groove to water lubricate the sliding surface, and the friction coefficient starts to increase rapidly at a peripheral speed of 5 m / s. The rotating side material is rotated for about 30 minutes at the surface pressure (limit surface pressure).
[0028]
The results of this sliding element test are shown in Table 1.
[0029]
[Table 1]

As is apparent from Table 1, PEEK-based resin is used in water lubrication, and a very high limit surface pressure of 5 MPa or more can be obtained by combining with double-layer stainless steel or cemented carbide. It was confirmed that there was no damage on the rotating side and no damage on the fixed side. In particular, in the combination of the cemented carbide film and the PEEK resin, the test piece No. As shown in FIG. 2, the extremely high limit surface pressure of 7 MPa (limit surface pressure which is 40% higher than the limit surface pressure of 5 MPa by the combination of the double-layer stainless steel of the test piece No. 1 and the PEEK resin) Obtained. The double-layer stainless steel has a Vickers hardness of 600 or more, and the cemented carbide coating is a nickel binder-based cemented carbide having corrosion resistance.
[0030]
In addition, by mixing carbon fibers with the PEEK resin forming the thermoplastic resin materials 4a2, 4b2, and 4c2, the mechanical strength of the thermoplastic resin materials 4a2, 4b2, and 4c2 is improved, and the carbon fiber portions are water-soluble. It was found that the lubrication effect was remarkably excellent because it became a reservoir.
[0031]
FIG. 4 shows a second embodiment of the present invention. This embodiment is different from the first embodiment described above as follows.
[0032]
In the present embodiment, a sleeve 13 having a corrosion-resistant cemented carbide coating 13a on the sliding surface is fixed to the pump main shaft 1, and a corrosion-resistant cemented carbide coating 13b is coated on both sliding surfaces of the thrust collar 5. This is different from the first embodiment. The sleeve 13 is made of SUS304, and is attached to a portion where the radial bearing 4a is located slightly longer than the radial bearing 4a, and is fixed to the pump main shaft 1 by a detent (not shown). The surface of the sleeve 13 is coated with a corrosion-resistant cemented carbide coating 13a.
[0033]
According to the present embodiment, when the surface 13a of the sleeve is damaged, only the sleeve 13 needs to be replaced, and the replacement cost can be reduced compared to the case where the main shaft itself is replaced. Further, as apparent from Table 1, since the corrosion-resistant cemented carbide coatings 13a and 13b are applied to the surfaces of the sleeve 13 and the thrust collar 5, they are not easily damaged and the surface is difficult to be deformed. Sexually improves. Since the cemented carbide and the thermoplastic resin are combined, the conformability is improved, and the roughness of the sliding surfaces of the sleeve 13 and the bearing 4a becomes small and smooth. For this reason, water film formation becomes favorable immediately after startup, and load resistance is improved. In this embodiment, the case where the cemented carbide coating is applied to the corrosion resistant metal (SUS304 or the like) has been described. However, a cemented carbide solid may be used in place of the cemented carbide coatings 13a and 13b. The material of the cemented carbide is preferably a nickel binder-based cemented carbide having corrosion resistance.
[0034]
FIG. 5 shows a third embodiment of the present invention. This embodiment is different from the first embodiment described above as follows.
[0035]
In this embodiment, the thrust collar 5 is directly fitted and fixed in the groove at the end of the pump main shaft 1 so that the end face of the radial bearing 4a made of only a thermoplastic resin can slide on the thrust collar 5. This is different from the first embodiment. According to the present embodiment, since the radial bearing 4a also serves as a thrust bearing, the configuration can be simple and inexpensive.
[0036]
FIG. 6 shows a fourth embodiment of the present invention. This embodiment is different from the above-described third embodiment as follows.
[0037]
This embodiment is a horizontal shaft drainage pump, in which one radial bearing 4a is installed in a pump casing 3, and the other radial bearing 4a and a thrust bearing are provided on the side surface of the pump casing 3 on the other end side of the pump main shaft 1. The difference from the third embodiment is that 4b and 4c are provided. In this horizontal axis drainage pump, a blade 2 is fixed to a pump main shaft 1, a pump casing 3 is provided so as to surround the outer periphery of the blade 2, a radial bearing 4 a is installed in the pump casing 3, and the remaining radial bearings 4a and thrust bearings 4b and 4c are fixed to the pump casing 3 side. Furthermore, piping 14 for using pumped water to the bearings 4a, 4b, 4c on the pump casing 3 side is connected to the discharge side. That is, one side of the radial bearing 4a on the other side communicates with the suction side passage of the pump casing 3, and the discharge side passage of the pump casing 3 communicates with the other side of the radial bearing 4a and the thrust bearings 4b and 4c. is doing. In the case of this type of pump, in normal operation, the bearings 4a, 4b, 4c provided on the pump casing 3 side are in a negative pressure state and pumped water is not supplied, so the thrust bearing 4b and the seal 7 are connected by the pipe 14 connected to the discharge side. Supply pumped water during At the time of operation, the pump casing 3 is filled with pumped water before the start-up, and the pump casing 3 is started after the filling to start the drainage operation.
[0038]
In the present embodiment, the pumped water can be reliably supplied to the bearing portions 4a, 4b, and 4c provided on the pump casing side. Therefore, as with the above-described two-suction centrifugal pump, the pump can be directly lubricated and stable for a long time. A high-reliability horizontal shaft drainage pump can be obtained while maintaining performance.
[0039]
【The invention's effect】
According to the present invention, it is possible to obtain a highly reliable horizontal shaft type pump that is maintenance-free and that can be stably operated for a long period of time and that can prevent damage due to contact of a radial bearing.
[0040]
In addition, according to the present invention, it is possible to obtain a horizontal shaft type pump that is maintenance-free and that can reduce vibration during high-speed rotation and can achieve a reduction in size and speed and improvement in efficiency of the pump.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a double suction centrifugal pump showing a first embodiment of the present invention.
2 is an enlarged view of a bearing portion on one side of both suction centrifugal pumps of FIG. 1;
FIG. 3 is an enlarged view of a bearing portion on the other side of the both suction centrifugal pumps of FIG. 1;
FIG. 4 is a longitudinal sectional view of a bearing portion of a double suction centrifugal pump showing a second embodiment of the present invention.
FIG. 5 is a longitudinal sectional view of a double suction centrifugal pump showing a third embodiment of the present invention.
FIG. 6 is a longitudinal sectional view of a horizontal axis drainage pump showing a fourth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Pump main shaft, 2 ... Blade | wing, 3 ... Pump casing, 3a ... Bearing support part, 4a ... Radial bearing, 4a0 ... Back metal, 4a1 ... Sintered filter, 4a2 ... Thermoplastic resin material, 4b, 4c ... Thrust bearing, 4b0 4c0 ... back metal, 4b1, 4c1 ... sintered filter, 4c2, 4c2 ... thermoplastic resin material, 5 ... thrust collar, 6 ... casing cover, 7 ... seal, 8 ... rib, 9 ... nut, 12 ... groove, 13 ... Sleeve, 13a, 13b ... Cemented carbide film, 15 ... Bolt, 16 ... Coupling part, 17 ... Casing cover.

Claims (7)

A pump main shaft with fixed blades; a pump casing that surrounds the outer periphery of the blade to form a water passage; bearings that support the pump main shaft on both sides of the fixed portion of the blade; and a thrust fixed to the pump main shaft In a horizontal shaft type pump comprising a collar and a casing cover fixed to a side surface of the pump casing ,
The bearing on one side is a sliding bearing, formed by a radial bearing having a groove ,
The bearing on the other side is a sliding bearing , a radial bearing having a groove , and on both sides of the thrust collar, in a space in the casing cover communicated with the water passage through the groove of the radial bearing on the other side. is formed by a thrust bearing provided,
A horizontal shaft type pump characterized in that the sliding parts of both radial bearings are made of thermoplastic resin, and pumping water is used as a lubricant for all the bearings. A pump main shaft with fixed blades; a pump casing that surrounds the outer periphery of the blade to form a water passage; bearings that support the pump main shaft on both sides of the fixed portion of the blade; and a thrust fixed to the pump main shaft In a horizontal shaft type pump comprising a collar and a casing cover fixed to a side surface of the pump casing ,
The bearing on one side is a sliding bearing, formed by a radial bearing having a groove ,
The bearing on the other side is a sliding bearing , a radial bearing having a groove , and on both sides of the thrust collar, in a space in the casing cover communicated with the water passage through the groove of the radial bearing on the other side. is formed by a thrust bearing provided,
A horizontal shaft type pump characterized in that the sliding parts of both the radial bearing and the thrust bearing are made of thermoplastic resin, and pumping water is used as a lubricant for all of these bearings.   3. The horizontal shaft pump according to claim 1, wherein the sliding portion of the bearing is made of a polyether ether ketone resin.   3. The thermoplastic resin forming the sliding portion of the bearing according to claim 1 or 2 is a polyether ether ketone resin, and the sliding portion of the pump main shaft is formed of a nickel binder cemented carbide having corrosion resistance. Horizontal shaft type pump characterized by A pump main shaft with fixed blades; a pump casing that surrounds the outer periphery of the blade to form a water passage; bearings that support the pump main shaft on both sides of the fixed portion of the blade; and a thrust fixed to the pump main shaft In a horizontal shaft type pump comprising a collar and a casing cover fixed to a side surface of the pump casing ,
The bearing on one side is a sliding bearing, formed by a radial bearing having a groove ,
The bearing on the other side is a sliding bearing, a radial bearing having a groove , and on both sides of the thrust collar, in a space in the casing cover communicated with the water passage through the groove of the radial bearing on the other side. is formed by a thrust bearing provided,
Holding the radial bearing on the other side in the water passage portion of the pump casing;
A horizontal shaft type pump using pumping water as a lubricant for all the bearings.   6. The other side radial bearing according to claim 5, wherein one side of the other radial bearing communicates with the suction side passage of the pump casing, and the discharge side passage of the pump casing communicates with the other side of the radial bearing and the thrust bearing. A horizontal shaft type pump characterized by that. A pump main shaft with fixed blades; a pump casing that surrounds the outer periphery of the blade to form a water passage; bearings that support the pump main shaft on both sides of the fixed portion of the blade; and a thrust fixed to the pump main shaft In a horizontal shaft type pump comprising a collar and a casing cover fixed to a side surface of the pump casing ,
The bearing on one side is a sliding bearing, formed by a radial bearing having a groove ,
The bearing on the other side is a sliding bearing , a radial bearing having a groove , and on both sides of the thrust collar, in a space in the casing cover communicated with the water passage through the groove of the radial bearing on the other side. is formed by a thrust bearing provided,
The sliding parts of both the radial bearings are formed of a thermoplastic resin, and the radial bearing on the other side is held by a side part facing the water passage of the pump casing, and pumping water for the pump as a lubricant for all the bearings A horizontal axis type pump characterized by using

Images