JPS5832993A - Overheat rreventing method for speed control system pump - Google Patents
Overheat rreventing method for speed control system pumpInfo
- Publication number
- JPS5832993A JPS5832993A JP13109281A JP13109281A JPS5832993A JP S5832993 A JPS5832993 A JP S5832993A JP 13109281 A JP13109281 A JP 13109281A JP 13109281 A JP13109281 A JP 13109281A JP S5832993 A JPS5832993 A JP S5832993A
- Authority
- JP
- Japan
- Prior art keywords
- pump
- solenoid valve
- detection means
- discharge
- flow rate
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は速度制御式ポンプの過熱防止方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing overheating of a speed controlled pump.
一般に、過熱防止用ミニマムフローの液量をポンプ速度
に応じて調整するためには、その流量を検出しである一
定流量以下になると過熱防止弁を開きミニマムフローさ
せている。Generally, in order to adjust the minimum flow amount of liquid for superheat prevention according to the pump speed, the flow rate is detected and when the flow rate falls below a certain level, the superheat prevention valve is opened to allow minimum flow.
しかしながら、従来の速度制御式ポンプの過熱防止方法
は100%回転数でも低速回転数でも一5定流量でミニ
マム70−させていたので、低速回転時において必要以
上の液量を液槽にもどすことになり無駄が生じるほか、
もどす液量が多いとポンプ軸動力が増加するので、無駄
な動力を余計に消費せしめる等の欠陥があった。However, the conventional method for preventing overheating of speed-controlled pumps is to maintain a constant flow rate at a minimum of 70- at both 100% rotation speed and low rotation speed, so it is difficult to return more liquid than necessary to the liquid tank during low-speed rotation. In addition to causing waste,
If the amount of liquid to be returned is large, the power of the pump shaft increases, which has the disadvantage of consuming unnecessary power.
本発明は上記欠陥を解消すべくなされたもので、その目
的とするところは、過熱防止用ミニマムフローの液量を
、ポンプ速度に応じて調整するようになし、ポンプが低
速回転で運転されてい゛るときに必要以上の揚液を吐出
ラインから逃がさなくてすむようにした運転経済上好適
な速度制御式ポンプの過熱防止方法を提供せんとするも
のである。The present invention was made in order to eliminate the above-mentioned defects, and its purpose is to adjust the minimum flow liquid amount for overheating prevention according to the pump speed, so that the pump is operated at low speed. It is an object of the present invention to provide a method for preventing overheating of a speed-controlled pump, which is suitable for economical operation and eliminates the need to release pumped liquid more than necessary from a discharge line when pumping.
以下、本発明の一実施例を図面に基づいて具体的に説明
する。Hereinafter, one embodiment of the present invention will be specifically described based on the drawings.
第1図において、1はポンプPおよび逆止弁2を備える
ポンプ吐出ラインであり、このポンプ吐出ライン1の前
記ポンプPおよび逆止弁2の下流側には流量計などの流
量検出手段3および圧力スイッチなどの圧力検出手段4
が設けられており、その吐出側には需要バルブ1a、1
b、ic、1d、1eが連設される。In FIG. 1, 1 is a pump discharge line equipped with a pump P and a check valve 2, and on the downstream side of the pump P and check valve 2 of this pump discharge line 1, a flow rate detection means 3 such as a flow meter and a Pressure detection means 4 such as a pressure switch
is provided, and demand valves 1a, 1 are provided on the discharge side thereof.
b, ic, 1d, and 1e are arranged in series.
前記ポンプ吐出ライン1のポンプPおよび逆止弁2と流
量検出手段6および圧力検出手段4との間からは過熱防
止用逃し配管5がバイノでスされており、この過熱防止
用逃し配管5によって揚液の一部を吐出側から吸込側の
液槽6へ還流せしめる。また、前記過熱防止用逃し配管
5上には電磁弁Mおよびオリフィス8が設けられる。An overheating prevention relief piping 5 is installed between the pump P and check valve 2 of the pump discharge line 1 and the flow rate detection means 6 and pressure detection means 4, and this overheating prevention relief piping 5 A part of the pumped liquid is returned from the discharge side to the liquid tank 6 on the suction side. Further, a solenoid valve M and an orifice 8 are provided on the overheat prevention relief pipe 5.
9は制御装置であり、前記流量検出手段6で検出される
前記ポンプ吐出ライン1の流量Q1の信号がこの制御装
置9に入力される。そして、この制御装置9に入力され
ん前記流量信号Q1を前記圧力検出手段4のオンオフ条
件と合わせ、圧力段階を二辺上に分けて判別し、その結
果前記過熱防止用逃し配管5の電磁弁Mを開閉制御する
。Reference numeral 9 denotes a control device, into which a signal of the flow rate Q1 of the pump discharge line 1 detected by the flow rate detection means 6 is inputted. Then, the flow rate signal Q1 input to the control device 9 is combined with the on/off conditions of the pressure detection means 4, and the pressure stage is divided into two sides and determined, and as a result, the solenoid valve of the overheat prevention relief pipe 5 is determined. Controls opening and closing of M.
次に、第2図はミニマムフローで流出させる場合の全揚
程曲線を示すもので、ポンプ100%回転速度でのミニ
マムフローの液量を、0(m/m1n)とすれば、低速
回転時でのミニマムフローの液量9.1(m/m1n)
はg−1中?。×fj(こ\で、N0は100%回転時
における回転数(rpm)、N1は低速回転時の回転数
(rpm)を示す)となり?。は?1より小さくてよい
。Next, Figure 2 shows the total head curve when discharging at minimum flow.If the minimum flow liquid volume at 100% pump rotation speed is 0 (m/m1n), then at low speed rotation Minimum flow liquid volume of 9.1 (m/m1n)
Is he in g-1? . ×fj (here, N0 indicates the rotation speed (rpm) at 100% rotation, and N1 indicates the rotation speed (rpm) at low speed rotation)? . teeth? It may be smaller than 1.
次に第3図はミニマムフローとポンプの液温上昇との関
係を示す温度上昇曲線の一例である。Next, FIG. 3 is an example of a temperature rise curve showing the relationship between the minimum flow and the rise in liquid temperature of the pump.
いま、ポンプケーシングより外部への放熱、グランド部
よりの漏洩を無視すれば、温度上昇は次式で計算するこ
とができる。Now, if we ignore heat radiation from the pump casing to the outside and leakage from the gland, the temperature rise can be calculated using the following formula.
△t=H−(1則−1)
427Cη
こ\で、△t:温度上昇(’C)
H:ポンプ運転状態の全揚程(2))
C:揚液の比熱
η :ポンプ運転状態でのポンプ効率(%)許容温度上
昇は吸液温度とNPSHにもよるが一般に10〜15℃
におさえるのがよい。第6図の温度上昇曲線において、
温度上昇値△tはポンプ特性によって変わり、温度上昇
限界をきめると、ミニマムフロー液量?が定まる。△t=H- (Rule 1-1) 427Cη Here, △t: Temperature rise ('C) H: Total head in pump operating state (2)) C: Specific heat of pumped liquid η: In pump operating state Pump efficiency (%) The allowable temperature rise depends on the suction temperature and NPSH, but is generally 10 to 15 degrees Celsius.
It is better to keep it in check. In the temperature rise curve in Figure 6,
The temperature rise value △t changes depending on the pump characteristics, and when the temperature rise limit is determined, the minimum flow liquid volume? is determined.
また、第4図は本発明の電磁弁Mの開閉制御を示すブロ
ック線図である。いま、流量検出手段3で検出されるポ
ンプ吐出ラインの流量信号Q1を制御装置9に入力し、
圧力検出手段4のON。Moreover, FIG. 4 is a block diagram showing the opening/closing control of the electromagnetic valve M of the present invention. Now, the flow rate signal Q1 of the pump discharge line detected by the flow rate detection means 3 is inputted to the control device 9,
Pressure detection means 4 is turned on.
OFF条件により次のごとく電磁弁Mが作用する。Depending on the OFF condition, the solenoid valve M operates as follows.
まず圧力検出手段4がON(ある圧力設定値以上である
条件を満たしている)されており、かつQi<t1’な
らば電磁弁Mを全開せしめ、更に制御装置9によりQl
〉?。′ならば電磁弁Mを全開せしめ、またQl〉?。First, if the pressure detection means 4 is turned ON (the condition that the pressure is higher than a certain pressure set value is satisfied) and Qi<t1', the solenoid valve M is fully opened, and then the control device 9
〉? . ′, then the solenoid valve M is fully opened, and Ql〉? .
′でないときは電磁弁Mを全開のま\の状態に保つ。一
方、Ql〈g、1′でないときは、電磁弁Mを全開させ
ることなくそのま\Qi>t□’の制御装置9にかけら
れ、以下Qi<t1’のときと同様の電磁弁Mの開閉制
御が行われる。If not, keep the solenoid valve M fully open. On the other hand, when Ql<g, 1', the solenoid valve M is not fully opened and is directly applied to the control device 9 of \Qi>t Control takes place.
また、圧力検出手段4がOFFされており、かつQi<
’t1ならば電磁弁■を全開せしめ、更に制御装置9に
よりQl〉?。ならば電磁弁Mを全開せしめ、またQl
〉?。でないときは電磁弁Mを全開のま\の状態に保つ
。一方、Qi<tlでないときは、電磁弁Mを全開させ
ることなくそのま\Q1〉柿の制御装置9にかけられ、
以下Qi<ylのときと同様の電磁弁Mの開閉制御が行
われる。Further, the pressure detection means 4 is turned off, and Qi<
If 't1, the solenoid valve ■ is fully opened, and furthermore, the control device 9 allows Ql>? . If so, fully open solenoid valve M, and Ql again.
〉? . Otherwise, keep solenoid valve M fully open. On the other hand, when Qi<tl, the control device 9 for \Q1> persimmon is directly applied without fully opening the solenoid valve M.
Thereafter, the opening/closing control of the solenoid valve M is performed in the same manner as when Qi<yl.
なお、前記実施例では圧力検出手段4を二接点形式とし
たものを示したが、前記圧力検出手段4を多接点形式H
1,N2 sH3、・・・・・・・・・として圧力条件
を多くすればより経済的である。In the above embodiment, the pressure detecting means 4 is of a two-contact type, but the pressure detecting means 4 is of a multi-contact type H.
It is more economical to increase the pressure conditions such as 1, N2 sH3, . . . .
また、前記圧力検出手段4の代りに回転スイッチなどの
回転数検出手段を設けて回転数条件でミニマムフロー?
を変えることも可能である。Also, instead of the pressure detection means 4, a rotation speed detection means such as a rotation switch is provided to detect the minimum flow under the rotation speed condition.
It is also possible to change.
以上のごとく、本発明はポンプ吐出ラインに流量検出手
段、圧力検出手段を設けるとともに前記ポンプ吐出ライ
ンに過熱防止用逃し配管を設け、この過熱防止用逃し配
管上の電磁弁を開閉制御して過熱防止する方法であって
、前記流量検出手段で検出される流量の信号を制御装置
に入力し、前記流量信号を圧力検出手段のON。As described above, the present invention provides a flow rate detection means and a pressure detection means in a pump discharge line, and also provides a relief pipe for overheating prevention in the pump discharge line, and controls the opening and closing of a solenoid valve on this relief piping to prevent overheating. In this method, a flow rate signal detected by the flow rate detection means is input to a control device, and the flow rate signal is turned on to the pressure detection means.
Claims (1)
るとともに、前記ポンプ吐出ラインに過熱防止用逃し配
管を設け、この過熱防止用逃し配管上の電磁弁を開閉制
御して過熱防止する方法であって、前記流量検出手段で
検出される流量の信号を制御装置に入力し、前記流量信
号を圧力検出手段のON、OFF’条件により二以上の
圧力段階に分けて判別し、前記電磁弁を開閉制御させる
ようにしたことを特徴とする速度制御式ポンプの過熱防
止方法。A method of preventing overheating by providing a flow rate detection means and a pressure detection means in a pump discharge line, and providing a relief pipe for overheating prevention in the pump discharge line, and controlling the opening and closing of a solenoid valve on the relief piping for overheating prevention. , the flow rate signal detected by the flow rate detection means is inputted to a control device, the flow rate signal is divided into two or more pressure stages depending on the ON/OFF' conditions of the pressure detection means, and the opening/closing control of the electromagnetic valve is controlled. A method for preventing overheating of a speed-controlled pump, characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13109281A JPS5832993A (en) | 1981-08-20 | 1981-08-20 | Overheat rreventing method for speed control system pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13109281A JPS5832993A (en) | 1981-08-20 | 1981-08-20 | Overheat rreventing method for speed control system pump |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5832993A true JPS5832993A (en) | 1983-02-26 |
Family
ID=15049786
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13109281A Pending JPS5832993A (en) | 1981-08-20 | 1981-08-20 | Overheat rreventing method for speed control system pump |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5832993A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59163200A (en) * | 1983-03-03 | 1984-09-14 | キング醸造株式会社 | Liquid feeder |
CN107676272A (en) * | 2017-09-14 | 2018-02-09 | 江苏大学 | A kind of fast adjuster of Working Conditions of Centrifugal Injection Pumps |
-
1981
- 1981-08-20 JP JP13109281A patent/JPS5832993A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59163200A (en) * | 1983-03-03 | 1984-09-14 | キング醸造株式会社 | Liquid feeder |
CN107676272A (en) * | 2017-09-14 | 2018-02-09 | 江苏大学 | A kind of fast adjuster of Working Conditions of Centrifugal Injection Pumps |
CN107676272B (en) * | 2017-09-14 | 2019-05-31 | 江苏大学 | A kind of fast adjuster of Working Conditions of Centrifugal Injection Pumps |
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