JPS6151672B2 - - Google Patents
Info
- Publication number
- JPS6151672B2 JPS6151672B2 JP8222582A JP8222582A JPS6151672B2 JP S6151672 B2 JPS6151672 B2 JP S6151672B2 JP 8222582 A JP8222582 A JP 8222582A JP 8222582 A JP8222582 A JP 8222582A JP S6151672 B2 JPS6151672 B2 JP S6151672B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- tank
- pump
- pressure regulating
- water level
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 92
- 230000001105 regulatory effect Effects 0.000 claims description 26
- 230000002265 prevention Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 2
- 239000010865 sewage Substances 0.000 description 10
- 238000001514 detection method Methods 0.000 description 7
- 238000005273 aeration Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Description
【発明の詳細な説明】
この発明は調圧タンクを利用した、ポンプのキ
ヤビテーシヨン防止装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pump cavitation prevention device using a pressure regulating tank.
たとえば汚水処理設備においては、エアレーシ
ヨン槽に流入する汚水の流量を一定に保つため
に、流入した汚水を受ける水槽にせきを設けて、
溢流した汚水を貯水槽に一時的に貯え、水源の水
量が減少したとき、貯水槽内の汚水をポンプによ
り上記流入側の水槽へ返送する方式が用いられる
場合がある。この方式においては、貯水槽側の水
位が大となり、ポンプの実揚程の変動が大きくな
る。 For example, in sewage treatment equipment, in order to maintain a constant flow rate of sewage flowing into the aeration tank, a weir is installed in the water tank that receives the inflowing sewage.
A method is sometimes used in which overflowing sewage is temporarily stored in a water tank, and when the amount of water at the water source decreases, the sewage in the tank is returned to the water tank on the inflow side using a pump. In this method, the water level on the water tank side becomes large, and the fluctuation in the actual head of the pump becomes large.
これに対処するために、ポンプの運転点を低い
揚程範囲に選定した場合、最大実揚程時にはポン
プの吐出水量が減少し、時には送排水ができなく
なる場合が生じる。上記の場合とは逆に運転点を
高い揚程範囲で選定した場合、最小実揚程時には
ポンプの吐出水量が増加し、また場合によつては
キヤビテーシヨンが発生し、ポンプを著じるしく
損傷する。 In order to cope with this, if the operating point of the pump is selected in a low head range, the amount of water discharged by the pump decreases at the maximum actual head, and sometimes water cannot be sent or drained. Contrary to the above case, if the operating point is selected in a high head range, the amount of water discharged by the pump increases at the minimum actual head, and cavitation may occur in some cases, seriously damaging the pump.
この発明は上述の欠点を排除するためになされ
たものであつて、実揚程が小さい範囲でもキヤビ
テーシヨンの発生を防止できる装置を提供するこ
とを目的とするものである。 The present invention has been made to eliminate the above-mentioned drawbacks, and it is an object of the present invention to provide a device that can prevent cavitation even in a range where the actual lift is small.
この発明は上記の目的を達成するために、ポン
プから給水される側の水槽に設けた調圧タンクに
ポンプから給水するとともに、調圧タンク内の空
気圧を供給側の水槽の水位により制御する。これ
によつてポンプの実揚程は所望の最小揚程以上に
保持され、流量の不要な増大を防止し、ポンプの
キヤビテーシヨンが防止される。 In order to achieve the above object, the present invention supplies water from a pump to a pressure regulating tank provided in a water tank on the side to which water is supplied from the pump, and controls the air pressure in the pressure regulating tank by the water level of the water tank on the supply side. This maintains the actual head of the pump above the desired minimum head, prevents unnecessary increases in flow rate, and prevents cavitation of the pump.
以下にこの発明の一実施例を図面とともに説明
する。 An embodiment of the present invention will be described below with reference to the drawings.
第１図はこの発明を汚水処理システムに適用し
た例を示しており、１は汚水源Ａから汚水が流入
する受水槽であり、この受水槽１に流入した汚水
は水槽２を介してエアレーシヨン槽（図示せず）
に供給され、またせき３を溢流した汚水は貯水槽
４に供給され、この貯水槽４内に一時的に貯留さ
れる。エアレーシヨン槽への給水は一定流量とな
るように制御され、もし水源からの流入水量が減
少した場合にはポンプ５を運転して貯水槽４の水
を受水槽１に供給し、エアレーシヨン槽２への流
量を一定に保つ。 Fig. 1 shows an example in which the present invention is applied to a sewage treatment system, where 1 is a water receiving tank into which sewage flows from a sewage source A, and the sewage that flows into this water receiving tank 1 is passed through a water tank 2 to an aeration tank. (not shown)
The sewage that has overflowed the weir 3 is supplied to a water storage tank 4, and is temporarily stored in this water storage tank 4. The water supply to the aeration tank is controlled to be a constant flow rate, and if the amount of water flowing from the water source decreases, the pump 5 is operated to supply water from the water storage tank 4 to the water receiving tank 1, and then to the aeration tank 2. Keep the flow rate constant.
６は受水槽１に設けた調圧タンクであり、この
調圧タンク６は下端のみ開口７しており、その下
端開口７は受水槽１内の水面下に浸漬されるよう
に設置されている。調圧タンク６の上部の空気部
分はポンプ５の吐出口と接続され、貯水槽４から
の給水を受けるとともに、適宜な空気源８から所
定圧力の空気が供給され、さらに貯水槽４に設け
た下端に開口９を有し、貯水槽４の水面下に浸漬
された水位検出管１０の空間部分に連通するよう
に接続されている。 Reference numeral 6 denotes a pressure regulating tank provided in the water receiving tank 1. This pressure regulating tank 6 has an opening 7 only at the lower end, and the lower end opening 7 is installed so as to be immersed under the water surface in the water receiving tank 1. . The upper air portion of the pressure regulating tank 6 is connected to the discharge port of the pump 5 and receives water from the water storage tank 4, and is also supplied with air at a predetermined pressure from an appropriate air source 8. It has an opening 9 at its lower end and is connected to communicate with the space of the water level detection tube 10 immersed below the water surface of the water storage tank 4 .
上記のような構成において、空気源８から所定
圧の空気が供給されており、調圧タンク６内に充
填され、この調圧タンク６内の水位６ａは、受水
槽１の水位１ａよりも低くなつている。また調圧
タンク６内の空気は連結管１１を介して水位検出
管１０に送給され、この水位検出管１０の水位１
０ａは貯水槽４の水位よりも低くなつている。 In the above configuration, air at a predetermined pressure is supplied from the air source 8 and filled into the pressure regulating tank 6, and the water level 6a in the pressure regulating tank 6 is lower than the water level 1a in the water receiving tank 1. It's summery. Furthermore, the air in the pressure regulating tank 6 is fed to the water level detection pipe 10 via the connecting pipe 11, and the water level of this water level detection pipe 10 is 1.
0a is lower than the water level of the water tank 4.
この水位検出管１０の水位１０ａは貯水槽４の
水位４ａの高低に応じて上下し、したがつて調圧
タンク６内の空気圧も貯水槽４の水位に対応して
増減し、その結果ポンプ５の実揚程が低くなるの
を防止する。 The water level 10a of this water level detection tube 10 rises and falls according to the height of the water level 4a of the water tank 4, and therefore the air pressure in the pressure regulating tank 6 also increases and decreases corresponding to the water level of the water tank 4, and as a result, the pump 5 prevent the actual head from becoming low.
第２図は調圧タンク６がある場合とない場合と
のポンプ５の実揚程と貯水槽４の水位の変化を定
性的に示しており、点線は調圧タンク６がない場
合、実線は調圧タンク６がある場合を示す。 Figure 2 qualitatively shows the changes in the actual head of the pump 5 and the water level in the water storage tank 4 with and without the pressure regulating tank 6. A case where a pressure tank 6 is provided is shown.
第１図の装置において、受水槽１の水位１ａと
調圧管６の下端との差をL1、貯水槽４の水位と
水位検出管１０の下端との差をL2、受水槽１の
水位と貯水槽４の水位差を△Ｌ、受水槽１の水位
とポンプ５の調圧タンク６の接続位置との高さの
差をｈ、水位検出管１０の下端と貯水槽４の低面
間距離をL3とすると、ポンプ５の実揚程Ｈは
L2＜L1のとき Ｈ＝△Ｌ＋L2＋ｈ
L2＞L1のとき Ｈ＝△Ｌ＋L1＋ｈ
となる。 In the device shown in FIG. 1, the difference between the water level 1a of the water tank 1 and the lower end of the pressure regulating pipe 6 is L 1 , the difference between the water level of the water tank 4 and the lower end of the water level detection pipe 10 is L 2 , and the water level of the water tank 1 is L 1 . and the water level difference between the water tank 4 and the water tank 4, △L, the height difference between the water level of the water receiving tank 1 and the connection position of the pressure regulating tank 6 of the pump 5, h, and the distance between the lower end of the water level detection pipe 10 and the lower surface of the water tank 4. When the distance is L 3 , the actual head H of the pump 5 is H=ΔL+L 2 +h when L 2 <L 1 and H=ΔL+L 1 +h when L 2 >L 1 .
ここでL1＝△Ｌ＋L2とすれば、貯水槽４の水
位がL2内にあれば、実揚程はL1＋ｈで一定とな
り、この水位がL3以下になると実揚程はL1＋ｈ
＋L3となる。 Here, if L 1 = △L + L 2 , then if the water level of the water tank 4 is within L 2 , the actual head will be constant at L 1 + h, and if this water level falls below L 3 , the actual head will be L 1 + h.
+L 3 .
第３図はこの発明の他の実施例を示し、第１図
の実施例における構成部分と均等なものには同一
の符号を付して、その部分の説明は省略する。 FIG. 3 shows another embodiment of the present invention, in which components equivalent to those in the embodiment of FIG. 1 are given the same reference numerals, and explanations of those parts will be omitted.
第３図においては２０は貯水槽４の水位検出
器、２１はPI（比例・積分）調節器、２２は空気
流量調節弁２３を駆動する電動機である。空気流
量調節弁２３で調節された空気は調圧タンク６内
に供給される。 In FIG. 3, 20 is a water level detector for the water tank 4, 21 is a PI (proportional/integral) regulator, and 22 is an electric motor that drives the air flow control valve 23. Air regulated by the air flow rate regulating valve 23 is supplied into the pressure regulating tank 6.
上記の構成において、貯水槽４の水位が上下す
ると、調節器２１の出力によつて、電動機２２が
制御され、空気流量調節弁２３の開度が制御さ
れ、調圧タンク６に供給される空気量が変化し、
調圧タンク６内の圧力が貯水槽４の水位に応じて
変化する。即ち貯水槽４の水位が高ければ調圧タ
ンク６内の圧力を上昇させて、ポンプ５の実揚程
の異常な低下を防止する。 In the above configuration, when the water level of the water tank 4 rises and falls, the output of the regulator 21 controls the electric motor 22 and the opening degree of the air flow control valve 23, thereby controlling the air flow that is supplied to the pressure control tank 6. The amount changes,
The pressure inside the pressure regulating tank 6 changes according to the water level in the water storage tank 4. That is, if the water level in the water tank 4 is high, the pressure in the pressure regulating tank 6 is increased to prevent the actual head of the pump 5 from being abnormally lowered.
以上詳述したように、この発明は水位の変動が
大きい第１の水槽からポンプを介して第２の水槽
へ給水する設備において、給水を受ける第２の水
槽に調圧タンクを設けて、ポンプから吐出される
流体を上記調圧タンク内に供給するとともに、調
圧タンク内の圧力を第１の水槽の水位に応じて増
減するようにしたものであるから、第１の水槽の
水位が上昇した場合には調圧タンク内の圧力が上
昇し、ポンプの実揚程をみかけ上高くすることが
でき、したがつて小揚程、大流量によるポンプの
キヤビテーシヨンを防止することができる。 As described in detail above, the present invention provides a system for supplying water from a first tank with large fluctuations in water level to a second tank via a pump, in which a pressure regulating tank is provided in the second tank that receives the water supply, and the pump The fluid discharged from the pressure regulating tank is supplied to the pressure regulating tank, and the pressure in the pressure regulating tank is increased or decreased according to the water level of the first water tank, so that the water level of the first water tank rises. In this case, the pressure in the pressure regulating tank increases, making it possible to make the actual head of the pump appear higher, thereby preventing cavitation of the pump due to a small head and a large flow rate.
第１図はこの発明の一実施例を示すブロツク
図、第２図は第１図の実施例におけるポンプの実
揚程を示すグラフ、第３図はこの発明の他の実施
例を示すブロツク図である。
１……受水槽、２……水槽、３……せき、４…
…貯水槽、５……ポンプ、６……調圧タンク、７
……開口、８……空気源、９……開口、１０……
水位検出管、１１……連結管、２０……水位検出
器、２１……PI調節器。
Fig. 1 is a block diagram showing one embodiment of the present invention, Fig. 2 is a graph showing the actual head of the pump in the embodiment of Fig. 1, and Fig. 3 is a block diagram showing another embodiment of the invention. be. 1...water tank, 2...water tank, 3...weir, 4...
...Water tank, 5...Pump, 6...Pressure adjustment tank, 7
...Opening, 8...Air source, 9...Opening, 10...
Water level detection tube, 11... Connecting pipe, 20... Water level detector, 21... PI regulator.
Claims (1)
ンプを介して第２の水槽へ流体を供給する供給装
置に用いられるポンプのキヤビテーシヨン防止装
置であつて、第２の水槽に調圧タンクを設けて、
上記ポンプにより第１の水槽の液体を上記調圧タ
ンク内に供給するとともに、調圧タンク内の空気
圧を第２の水槽の液面に応じて変化させることを
特徴とするポンプのキヤビテーシヨン防止装置。1. A cavitation prevention device for a pump used in a supply device that supplies fluid from a first water tank with relatively large water level fluctuations to a second water tank via a pump, in which a pressure regulating tank is provided in the second water tank. hand,
A cavitation prevention device for a pump, characterized in that the pump supplies the liquid in the first water tank into the pressure regulating tank and changes the air pressure in the pressure regulating tank according to the liquid level in the second water tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8222582A JPS58200088A (en) | 1982-05-15 | 1982-05-15 | Apparatus for preventing cavitation of pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8222582A JPS58200088A (en) | 1982-05-15 | 1982-05-15 | Apparatus for preventing cavitation of pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58200088A JPS58200088A (en) | 1983-11-21 |
| JPS6151672B2 true JPS6151672B2 (en) | 1986-11-10 |
Family
ID=13768460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8222582A Granted JPS58200088A (en) | 1982-05-15 | 1982-05-15 | Apparatus for preventing cavitation of pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58200088A (en) |
-
1982
- 1982-05-15 JP JP8222582A patent/JPS58200088A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58200088A (en) | 1983-11-21 |
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