JPH0448952B2 - - Google Patents
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- Publication number
- JPH0448952B2 JPH0448952B2 JP57008654A JP865482A JPH0448952B2 JP H0448952 B2 JPH0448952 B2 JP H0448952B2 JP 57008654 A JP57008654 A JP 57008654A JP 865482 A JP865482 A JP 865482A JP H0448952 B2 JPH0448952 B2 JP H0448952B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- section
- pump
- flow path
- control
- 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 - Lifetime
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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
- F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
Landscapes
- Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Description
【発明の詳細な説明】
本発明は定流量ポンプに関し、更に詳述すれば
内部に流量校正機能を有する定流量ポンプに関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a constant flow pump, and more particularly to a constant flow pump having an internal flow rate calibration function.
従来、所定流量で送液するプランジヤポンプは
ある。しかし、その送液量は温度、粘度、シール
部材の摩耗による漏れ、負荷圧力の変動等により
変化し、一定のものではない。流量の変動に対し
ては、従来はポンプの吐出量を実測し、これから
目標値との偏差を求め、ポンプに設けられた流量
調節用螺子等を適当に調節することを繰返して行
なつていた。しかし、上記方法による場合には、
流量の調節は勘に頼る部分が多くなり、時間がか
かるのが一般である。また、予め流量の実測値と
目盛の関係（検量線）を作成しておいて、この検
量線を用いてポンプの流量を定めることも行なわ
れている。しかし、この方法による場合には、上
述したように、送液する流体、温度、粘度その他
が変わる毎に検量線も変化し、従つてその都度、
検量線を作り直すことが必要となり、やはり繁雑
なものである。 Conventionally, there are plunger pumps that pump liquid at a predetermined flow rate. However, the amount of liquid fed varies depending on temperature, viscosity, leakage due to wear of the sealing member, fluctuations in load pressure, etc., and is not constant. In the past, to deal with fluctuations in flow rate, the method was to measure the pump's discharge volume, calculate the deviation from the target value, and repeatedly adjust the flow adjustment screws etc. installed on the pump. . However, in the case of the above method,
Adjusting the flow rate requires a lot of intuition and is generally time consuming. Furthermore, a relationship (calibration curve) between the measured value of the flow rate and the scale is created in advance, and the flow rate of the pump is determined using this calibration curve. However, when using this method, as mentioned above, the calibration curve changes every time the fluid to be delivered, temperature, viscosity, etc. change, and therefore, each time,
It is necessary to recreate the calibration curve, which is still complicated.
本発明は上記事情を改善するためになされたも
ので、演算処理機能と流量の計量機能を送液ポン
プに付与することにより、簡単かつ確実に所望の
校正された流量で送液するポンプを提供すること
を目的とする。 The present invention has been made to improve the above-mentioned situation, and provides a pump that easily and reliably delivers liquid at a desired calibrated flow rate by providing a calculation processing function and a flow rate measurement function to the liquid sending pump. The purpose is to
以下、本発明の一実施例につき図面を参照して
説明する。 Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
図中１は基板２に取付けられたポンプヘツド
で、その内部には垂直方向に輸送液体の通路３が
穿設されている。この通路３の下部にはバルブシ
ール４とボール５とからなる下部逆止弁を介装し
て吸入部６が、また通路３の上部にはバルブシー
ト７とボール８とからなる上部逆止弁を介装して
吐出部９が形成されている。 In the figure, reference numeral 1 denotes a pump head attached to a substrate 2, in which a passage 3 for transporting liquid is perforated in the vertical direction. In the lower part of this passage 3, a lower check valve consisting of a valve seal 4 and a ball 5 is interposed, and a suction part 6 is installed, and in the upper part of the passage 3, an upper check valve consisting of a valve seat 7 and a ball 8 is installed. A discharge portion 9 is formed by interposing.
前記ポンプヘツド１内には通路３方向に向つて
上向傾斜をもつてポンピングシリンダ孔１０が穿
設されており、通路３と前記ポンピングシリンダ
孔１０はポンプヘツド１内において連通してい
る。このシリンダ孔１０内にはプランジヤ１１の
一端側がパツキン１２を介装して液密かつその軸
方向に摺動自在に挿入されている。 A pumping cylinder hole 10 is bored in the pump head 1 with an upward slope toward the passage 3, and the passage 3 and the pumping cylinder hole 10 communicate with each other in the pump head 1. One end of a plunger 11 is inserted into the cylinder hole 10 with a packing 12 interposed therebetween in a fluid-tight manner and slidable in the axial direction thereof.
また、プランジヤ１１の他端には円柱状のラツ
ク１３が取付けられている。そして、このラツク
１３はパルスモータ１４の回転軸１５に取付けら
れたピニオン１６に噛み合されており、回転軸１
５の回転運動がこれらピニオン１６及びラツク１
３により直線運動に変換されてプランジヤ１１に
伝達され、プランジヤ１１がシリンダ孔１０内を
その軸方向に沿つて往復運動せしめられ、これに
より吸入部６からシリンダ内に吸入された液体が
上部逆止弁を介して吐出部９から吐出されるもの
である。１７は外部から入力を行なう入力部を備
え、外部からの入力に基づいて各種演算、制御を
予め組込まれたプログラムに従つて実行する制御
部で、この制御部の送出する制御量であるパルス
に対応して、前記パルスモータ１４の回転方向及
び回転角が制御される。 Further, a cylindrical rack 13 is attached to the other end of the plunger 11. This rack 13 is engaged with a pinion 16 attached to a rotating shaft 15 of a pulse motor 14.
The rotational movement of these pinions 16 and racks 1
3, the liquid is converted into a linear motion and transmitted to the plunger 11, and the plunger 11 is caused to reciprocate within the cylinder hole 10 along its axial direction, whereby the liquid sucked into the cylinder from the suction portion 6 passes through the upper check valve. It is discharged from the discharge section 9 via a valve. Reference numeral 17 denotes a control unit that is equipped with an input unit that receives input from the outside, and executes various calculations and controls based on the input from the outside according to a pre-installed program. Correspondingly, the rotation direction and rotation angle of the pulse motor 14 are controlled.
前記吐出部９には吐出パイプ１８の一端が連結
されて、これにより吐出側流路が形成され、この
パイプ１８を通つて送液すべき液体が圧送され
る。この吐出パイプ１８には、前記制御部１７に
より流路の切換えを制御される三方電磁弁１９が
介装されている。前記電磁弁１９には分岐管２０
の一端が接続されていると共に、他端は計量部２
１の計量管２２内に配設され、これにより計量部
流路が形成されている。前記計量管２２は透明の
シリンダを垂直に立設すると共に、その外周壁に
垂直方向に沿つて所定間隔毎にそれぞれ一対の第
１〜第４発光部２３ａ〜ｄ及び第１〜第４受光部
２４ａ〜ｄが対向して配設されており、この各発
光部２３ａ〜ｄの放射する光量の変化をそれぞれ
対向する受光部２４ａ〜ｄが検出し、これを制御
部に送ることにより計量管２２内の液面位置を検
出する。 One end of a discharge pipe 18 is connected to the discharge section 9, thereby forming a discharge side flow path, through which the liquid to be sent is pumped. This discharge pipe 18 is provided with a three-way solenoid valve 19 whose flow path switching is controlled by the control section 17 . A branch pipe 20 is connected to the solenoid valve 19.
One end is connected to the measuring section 2, and the other end is connected to the measuring section 2.
The measuring tube 22 is disposed within one metering tube 22, thereby forming a metering section flow path. The metering tube 22 has a transparent cylinder arranged vertically, and pairs of first to fourth light emitting parts 23a to 23d and first to fourth light receiving parts, respectively, arranged at predetermined intervals along the vertical direction on the outer peripheral wall of the metering tube 22. 24a to 24d are arranged to face each other, and the opposing light receiving parts 24a to 24d detect changes in the amount of light emitted by each of the light emitting parts 23a to 23d, and send this to the control part to control the measurement tube 22. Detects the liquid level position inside.
次に、上記ポンプを用いて所定の流量で送液す
る場合につき説明する。 Next, a case will be described in which the pump is used to send liquid at a predetermined flow rate.
まず、制御部１７の入力部から所望の送液流量
を入力しスタートボタン（図示せず）を押すと、
制御部１７に組込まれた制御プログラムが起動
し、校正の準備が行なわれる。即ち、制御部１７
から三方電磁弁１９に信号が送られて電磁弁１９
の流路が計量部流路に切換えられると共に、制御
部１７からパルスモータ１４に所定時間当りのパ
ルス数（第２図においてはf1）のパルスが送られ
る。すると、ポンプ１４は所定時間当りのパルス
数（f1）に応じた送液流量（第２図においては
v1）で送液し、送液された液体は吐出パイプ１
８、三方弁１９、分岐管２０を通つて計量管２２
内に吐出される。これにより、計量管２２内の液
面が上昇し、最下部に配設された第１受光部２４
ａを液面が越える際に、対向する第１発光部２３
ａから第１受光部２４ａに到達する光量が変化す
る。この光量の変化が第１受光部２４ａで検知さ
れて検知信号が制御部１７に送られ、この時から
第２受光部２４ｂを液面が越えるまでの送液に要
するパルス数が制御部１７で測定される。そし
て、予め実測により求めてある第１受光部２４ａ
と第２受光部２４ｂとの間の計量管の容積と、こ
の容積を満すのに要した前記実測パルス数とか
ら、ポンプの送液流量が制御部１７で算出され、
所定時間当りのパルス数f1に対する送液流量v1が
制御部１７のメモリに記憶される。 First, input the desired liquid feeding flow rate from the input section of the control section 17 and press the start button (not shown).
A control program installed in the control unit 17 is activated and preparations for calibration are made. That is, the control section 17
A signal is sent from the three-way solenoid valve 19 to the solenoid valve 19.
The flow path is switched to the metering section flow path, and at the same time, pulses are sent from the control section 17 to the pulse motor 14 at a predetermined number of pulses (f 1 in FIG. 2). Then, the pump 14 pumps the liquid at a flow rate (in Fig. 2) according to the number of pulses (f 1 ) per predetermined time.
v 1 ), and the delivered liquid is sent to the discharge pipe 1.
8. Three-way valve 19, metering pipe 22 through branch pipe 20
discharged inside. As a result, the liquid level inside the metering tube 22 rises, causing the first light receiving section 24 disposed at the bottom to rise.
When the liquid level exceeds a, the opposing first light emitting section 23
The amount of light reaching the first light receiving section 24a changes from a. This change in the amount of light is detected by the first light receiving section 24a and a detection signal is sent to the control section 17. From this point on, the control section 17 determines the number of pulses required to feed the liquid until the liquid level exceeds the second light receiving section 24b. be measured. The first light receiving portion 24a is determined in advance by actual measurement.
The liquid flow rate of the pump is calculated by the control unit 17 from the volume of the metering tube between and the second light receiving part 24b and the measured number of pulses required to fill this volume,
The liquid feeding flow rate v 1 for the number of pulses f 1 per predetermined time is stored in the memory of the control unit 17 .
次に、所定時間当りのパルス数の異なるパルス
列（第２図においてはf2）が制御部１７からパル
スモータ１４に送られ、前記同様にして第３受光
部２４ｃから第４受光部２４ｄに液面が到達する
のに要するパルス数が測定され、これから同様に
して所定時間当りのパルス数f2に対する送液流量
v2が算出されメモリに記憶される。次いで、この
ようにして求めたそれぞれの所定時間当りのパル
ス数に対する送液流量の関係を用いて検量線が作
成され、これがメモリに記憶される。 Next, a pulse train having a different number of pulses per predetermined time (f 2 in FIG. 2) is sent from the control section 17 to the pulse motor 14, and in the same manner as described above, the liquid is transferred from the third light receiving section 24c to the fourth light receiving section 24d. The number of pulses required for the surface to reach the surface is measured, and from this the flow rate for the number of pulses per predetermined time f 2 is determined in the same way.
v 2 is calculated and stored in memory. Next, a calibration curve is created using the thus determined relationship between the number of pulses per predetermined time and the liquid flow rate, and this curve is stored in the memory.
その後、制御部１７のメモリに記憶された前記
検量線を用いて最初に入力部から入力された所望
の送液流量の値から、最初に入力された送液流量
（第２図においてはv3）に対応する所定時間当り
のパルス数（第２図においてはf3）が算出され、
このパルス数のパルスがパルスモータ１４に送出
され、所望の流量の液体が送液される。 Thereafter, using the calibration curve stored in the memory of the control unit 17, the value of the desired liquid feeding flow rate inputted first from the input unit is calculated from the initially inputted liquid feeding flow rate (v 3 in FIG. 2). ) is calculated, and the number of pulses per predetermined time (f 3 in Figure 2) is calculated,
This number of pulses is sent to the pulse motor 14, and a desired flow rate of liquid is delivered.
本実施例のポンプにおいては、制御部１７内に
予め組込まれたプログラムに従つて、所定時間当
りのパルス数の異なるパルスを順次パルスモータ
１２に送つて送液を行なうと共に、それぞれの異
なる所定時間当りのパルス数における送液流量を
計量部で実測して求め、これらのパルス数と送液
流量実測値との関係から検量線を作成してメモリ
に予め記憶しておき、入力部から入力された所望
の送液流量値から前記検量線を用いてパルスモー
タ１４に送出すべき所定時間当りのパルス数を決
定しているため、ポンプの送液流量は極めて正確
なもので、しかもこれらの操作は制御部１７の制
御下に自動的に行なわれるため、このポンプの取
扱いは極めて簡単なものである。そして、駆動源
としてパルスモータ１４を使用してその回転運動
をラツク１３、ピニオン１６により直線運動に変
換し、これを直接プランジヤ１１に伝達するよう
にしたので構造が簡素化され、しかもプランジヤ
１１の運動が数値化されているため、ポンプの送
液精度は高いものである。更に、シリンダ孔１０
を上向傾斜をもつて形成したので、何らかの原因
で気泡が混入又は発生し、これがシリンダ孔１０
内に滞留することにより送液流量に影響を与える
等の事故もない。 In the pump of this embodiment, according to a program pre-installed in the control unit 17, pulses with different numbers of pulses per predetermined time are sequentially sent to the pulse motor 12 to perform liquid feeding, and each pulse is delivered for a different predetermined time. The liquid feeding flow rate at a given number of pulses is actually measured using the metering unit, and a calibration curve is created from the relationship between these pulse numbers and the measured liquid feeding flow rate, stored in memory in advance, and inputted from the input unit. Since the number of pulses per predetermined time to be sent to the pulse motor 14 is determined from the desired liquid feeding flow rate value using the calibration curve, the liquid feeding flow rate of the pump is extremely accurate, and moreover, these operations Since this is automatically carried out under the control of the control section 17, handling of this pump is extremely simple. The pulse motor 14 is used as a drive source, and its rotary motion is converted into linear motion by the rack 13 and pinion 16, and this is directly transmitted to the plunger 11, which simplifies the structure. Since the movement is digitized, the pump has high liquid delivery accuracy. Furthermore, the cylinder hole 10
Since the cylinder hole 10 is formed with an upward slope, air bubbles may be mixed in or generated for some reason, and this may cause the cylinder hole 10 to have an upward slope.
There are no accidents such as influence on the flow rate due to the liquid remaining inside.
なお、上記実施例においては送液流量の測定に
際し、送液容量を測定するために計量管２２を用
いたがこれに限られず、例えば重量センサー等を
用いて送液重量を測定するようにしても良く、ま
たプランジヤ１１の駆動源もパルスモータ１４に
限られず、各種の公知の駆動源が利用でき、更に
シリンダ孔１０も上向傾斜をなして形成したがこ
れに限られず、その他本発明の要旨を逸脱しない
範囲で種々変形して差支えない。 In the above embodiment, the measuring tube 22 is used to measure the volume of the liquid to be fed when measuring the flow rate of the liquid to be fed, but the present invention is not limited to this. For example, a weight sensor or the like may be used to measure the weight of the liquid to be fed. Furthermore, the driving source of the plunger 11 is not limited to the pulse motor 14, and various known driving sources can be used.Furthermore, although the cylinder hole 10 is also formed with an upward slope, the present invention is not limited to this. Various modifications may be made without departing from the gist.
而して、本発明のポンプは外部から演算処理部
に入力を行なう入力部と、外部からの入力に基づ
いて各種演算、制御を行なう制御部と、制御部の
送出する制御量信号によりその送液流量が制御さ
れる送液ポンプと、送液ポンプの吐出側流路に存
し制御部からの信号により吐出側流路と計量部流
路とを切換える流路切換弁と、計量部流路に連結
され送液ポンプの送液流量を計量すると共に、得
られる計量値を制御部に返送する計量部とからな
り、送液するに際し予め制御部の信号により切換
弁を吐出側流路から計量部流路に切換えた後、制
御部から順次異なる制御量信号を送液ポンプに送
出して送液ポンプを作動させると共に、前記送出
した順次異なる制御量信号に対応して作動する送
液ポンプの送液流量をそれぞれ計量部で計量して
その計量値を制御部に送り、制御部でこれらの制
御量と計量値とから検量線を作成してこれを制御
部内のメモリに一時記憶しておき、その後制御部
の信号により切換弁を計量部流路から吐出側流路
に切換えると共に、入力部から入力される送液流
量を前記検量線を用いて制御量に換算し、この換
算した制御量信号を送液ポンプに送出してその送
液流量を校正するように構成したので、その送液
精度は極めて高いものであり、またこれら校正操
作は全て自動的に行なわれるため取扱いが簡単で
ある等の特長を有する。 The pump of the present invention has an input section that inputs input to the arithmetic processing section from the outside, a control section that performs various calculations and controls based on input from the outside, and a control section that controls the amount of data sent by the control amount signal sent from the control section. A liquid feeding pump whose liquid flow rate is controlled, a flow path switching valve which is present in the discharge side flow path of the liquid feeding pump and switches between the discharge side flow path and the metering portion flow path based on a signal from the control section, and a metering portion flow path. The metering section is connected to the pump and measures the flow rate of the liquid sent by the liquid sending pump, and returns the obtained measured value to the control section.When sending the liquid, the switching valve is connected to the control section in advance to measure the flow rate from the discharge side flow path. After switching to the partial flow path, the control unit sequentially sends different control amount signals to the liquid feeding pump to operate the liquid feeding pump, and also causes the liquid feeding pump to operate in response to the sequentially different control amount signals sent out. Each flow rate of the liquid to be sent is measured by a measuring section, and the measured values are sent to the control section.The control section creates a calibration curve from these controlled quantities and the measured values, and temporarily stores it in the memory within the control section. Thereafter, the switching valve is switched from the metering section flow path to the discharge side flow path according to a signal from the control section, and the liquid feeding flow rate inputted from the input section is converted into a control amount using the calibration curve, and the converted control amount is Since it is configured to send a signal to the liquid pump to calibrate the liquid feeding flow rate, the liquid feeding accuracy is extremely high, and all of these calibration operations are performed automatically, making it easy to handle. It has the following features.
第１図は本発明の一実施例を示す一部断面側面
図、第２図は所定時間当りのパルス数とポンプの
送液流量の関係を示すグラフである。
１……ポンプヘツド、６……吸入部、９……吐
出部、１４……パルスモータ、１７……制御部、
１９……三方電磁弁、２０……分岐管、２１……
計量部、２２……計量管。
FIG. 1 is a partially sectional side view showing an embodiment of the present invention, and FIG. 2 is a graph showing the relationship between the number of pulses per predetermined time and the flow rate of liquid sent by the pump. DESCRIPTION OF SYMBOLS 1... Pump head, 6... Suction part, 9... Discharge part, 14... Pulse motor, 17... Control part,
19... Three-way solenoid valve, 20... Branch pipe, 21...
Measuring section, 22...Measuring tube.
Claims (1)
と、外部からの入力に基づいて各種演算、制御を
行なう制御部と、制御部の送出する制御量信号に
よりその送液流量が制御される送液ポンプと、送
液ポンプの吐出側流路に存し制御部からの信号に
より吐出側流路と計量部流路とを切換える流路切
換弁と、計量部流路に連結され送液ポンプの送液
流量を計量すると共に、得られる計量値を制御部
に返送する計量部とからなり、送液するに際し予
め制御部の信号により切換弁を吐出側流路から計
量部流路に切換えた後、制御部から順次異なる制
御量信号を送液ポンプに送出して送液ポンプを作
動させると共に、前記送出した順次異なる制御量
信号に対応して作動する送液ポンプの送液流量を
それぞれ計量部で計量してその計量値を制御部に
送り、制御部でこれらの制御量と計量値とから検
量線を作成してこれを制御部内のメモリに一時記
憶しておき、その後制御部の信号により切換弁を
計量部流路から吐出側流路に切換えると共に、入
力部から入力される送液流量を前記検量線を用い
て制御量に換算し、この換算した制御量信号を送
液ポンプに送出してその送液流量を校正するよう
構成したことを特徴とするポンプ。 ２ 送液ポンプがパルスモータで駆動される特許
請求の範囲第１項記載のポンプ。[Scope of Claims] 1. An input section that inputs input to the arithmetic processing section from the outside, a control section that performs various calculations and controls based on input from the outside, and a controlled amount signal sent from the control section to control the flow rate of the liquid to be sent. a liquid transfer pump that is controlled; a flow path switching valve that is located in the discharge side flow path of the liquid transfer pump and switches between the discharge side flow path and the metering section flow path based on a signal from the control section; and a flow path switching valve that is connected to the metering section flow path. The measuring section measures the flow rate of the liquid sent by the liquid sending pump and returns the obtained measured value to the control section.When sending liquid, the switching valve is switched from the discharge side flow path to the metering section flow according to a signal from the control section in advance. After switching to the channel, the control unit sequentially sends different control amount signals to the liquid feeding pump to operate the liquid feeding pump, and the liquid feeding pump operates in response to the sequentially different control amount signals sent out. Each flow rate is measured by the measuring section and the measured values are sent to the control section.The control section creates a calibration curve from these controlled variables and the measured values, temporarily stores it in the memory in the control section, and then The switching valve is switched from the metering section flow path to the discharge side flow path according to a signal from the control section, and the liquid feeding flow rate inputted from the input section is converted into a control amount using the calibration curve, and this converted control amount signal is A pump characterized in that the pump is configured to send liquid to a liquid feeding pump and calibrate the flow rate of the liquid. 2. The pump according to claim 1, wherein the liquid feeding pump is driven by a pulse motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP865482A JPS58126489A (en) | 1982-01-22 | 1982-01-22 | pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP865482A JPS58126489A (en) | 1982-01-22 | 1982-01-22 | pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58126489A JPS58126489A (en) | 1983-07-27 |
| JPH0448952B2 true JPH0448952B2 (en) | 1992-08-10 |
Family
ID=11698914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP865482A Granted JPS58126489A (en) | 1982-01-22 | 1982-01-22 | pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58126489A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6264912A (en) * | 1985-09-17 | 1987-03-24 | Minoru Atake | Distributive injection apparatus |
| JPH0627837Y2 (en) * | 1985-12-06 | 1994-07-27 | 日本電子株式会社 | Liquid delivery pump device |
| JPH0440170U (en) * | 1990-02-27 | 1992-04-06 | ||
| JPH046776U (en) * | 1990-04-27 | 1992-01-22 | ||
| EP3483434B1 (en) * | 2014-10-13 | 2023-03-22 | Alfa S.r.l. | Positive-displacement pump and pumping group for fluid products and method for the use thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5529262A (en) * | 1978-08-23 | 1980-03-01 | Hitachi Ltd | Brush holder |
-
1982
- 1982-01-22 JP JP865482A patent/JPS58126489A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58126489A (en) | 1983-07-27 |
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