JPH0519591Y2 - - Google Patents
Info
- Publication number
- JPH0519591Y2 JPH0519591Y2 JP1987076275U JP7627587U JPH0519591Y2 JP H0519591 Y2 JPH0519591 Y2 JP H0519591Y2 JP 1987076275 U JP1987076275 U JP 1987076275U JP 7627587 U JP7627587 U JP 7627587U JP H0519591 Y2 JPH0519591 Y2 JP H0519591Y2
- Authority
- JP
- Japan
- Prior art keywords
- air
- working
- valve
- spool valve
- working air
- 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
Links
- 238000010586 diagram Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 3
- 239000003973 paint Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
Landscapes
- Reciprocating Pumps (AREA)
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案は、塗料等を圧送するポンプとして用い
られ、圧縮空気によつて作動するダイアフラムポ
ンプを両側に配置し、交互に圧送するダブルダイ
アフラム式ポンプに関するものである。[Detailed description of the invention] [Industrial application field] This invention is a double diaphragm type pump that is used as a pump to pump paint, etc., and has diaphragm pumps operated by compressed air arranged on both sides and pumps the paint alternately. It concerns pumps.
［従来の技術］
いわゆる、ダブルダイアフラムポンプと呼ば
れ、両側に設けたダイアフラムに交互に圧縮空気
を供給し、往復作動を繰り返しながら、圧送する
ポンプは作動空気の切替にパイロツトエアーを使
用していることが多い。[Prior art] This pump, so-called a double diaphragm pump, alternately supplies compressed air to diaphragms installed on both sides, and uses pilot air to switch the operating air while repeating reciprocating operation. There are many things.
パイロツトエアーはダイアフラムと連結された
作動軸の移動によつて供給が制御され、それによ
つて切替弁（通常はスプール弁が多く使われてい
る）を動かし、作動空気の供給を制御する。 The supply of pilot air is controlled by the movement of an operating shaft connected to the diaphragm, which moves a switching valve (usually a spool valve) to control the supply of operating air.
スプール弁の供給口より一方の作動空気室に圧
縮空気を送つている時は、他方の作動空気室は、
スプール弁を介して排気通路に連通されている。
また、パイロツトエアー通路は、それぞれの作動
空気室とダイアフラムの作動終端近くで連通する
よう構成されている。したがつて、第３図におい
て、ダイアフラムを右に作動させると、このダイ
アフラムの作動終端近くで、パイロツトエアーは
通路１３からスプール弁１２の左側のパイロツト
エアー口ａに送られ、ピストン１４ａを押しスプ
ール弁１４を右側に移動させる。これによつて、
作動空気はスプール弁のｂよりｃを通り左側のダ
イアフラム室７に圧縮空気を送り込み、ポンプ室
６を左に作動させる。 When compressed air is being sent to one working air chamber from the supply port of the spool valve, the other working air chamber is
It is communicated with the exhaust passage via a spool valve.
The pilot air passages are also configured to communicate with the respective working air chambers near the working ends of the diaphragms. Therefore, in FIG. 3, when the diaphragm is operated to the right, near the end of operation of this diaphragm, pilot air is sent from the passage 13 to the pilot air port a on the left side of the spool valve 12, pushing the piston 14a and pushing the spool. Move valve 14 to the right. By this,
The operating air passes from b to c of the spool valve and sends compressed air into the diaphragm chamber 7 on the left side, thereby operating the pump chamber 6 to the left.
ダイアフラムの作動によつて吸込、吐出しを行
うポンプ室は圧送液容器と連絡している吸込口が
接続され、また吐出口は圧送ホースを介し、スプ
レーガン等に接続されるのが一般的であり、ポン
プ作動は圧送ポンプ側の圧力と、作動空気圧力が
同じになつた時つり合つて停止する。したがつて
スプレーガン等を接続して圧送液を吐出すれば、
ダイアフラムは吐出量に応じて作動し、吐出を停
止すればバランスを保ち、停止する構造となつて
いる。 The pump chamber, which performs suction and discharge through the operation of a diaphragm, is connected to a suction port that communicates with a pressurized liquid container, and the discharge port is generally connected to a spray gun, etc. via a pressurized hose. Yes, the pump operation will be balanced and stop when the pressure on the pressure pump side and the operating air pressure become the same. Therefore, if you connect a spray gun etc. and discharge the liquid under pressure,
The diaphragm operates according to the amount of discharge, and when the discharge is stopped, it maintains balance and stops.
［考案が解決しようとする問題点］
この種のポンプは一般に低圧力で液を圧送する
傾向があり、ダイアフラムを駆動する空気圧力も
必然的に低圧となる。このような状態で運転する
と、切替用のスプール弁を動かす力が不足し、し
ばしば切替不良を起す。また、始動、停止時はど
うても低圧作動空気が送り込まれるため、動油に
切替不良を起しやすい状態となる。また、スプー
ル弁のパイロツトエアー圧力が低いと、スプール
弁の作動抵抗や、反対側の残圧のため、スプール
弁がつり合つてしまい、いずれの方向にも作動空
気が流れないところで停止してしまうことがあ
る。[Problems to be Solved by the Invention] This type of pump generally tends to pump liquid at low pressure, and the air pressure that drives the diaphragm is also inevitably at low pressure. When operating under such conditions, there is insufficient force to move the switching spool valve, often resulting in switching failures. Furthermore, since low-pressure working air is inevitably sent during startup and shutdown, switching failures in the hydraulic fluid are likely to occur. Also, if the pilot air pressure of the spool valve is low, the spool valve will become unbalanced due to the operating resistance of the spool valve and the residual pressure on the opposite side, and the spool valve will stop when the operating air cannot flow in either direction. Sometimes.
［問題点を解決するための手段］
作動空気をある程度高圧にすることによつて、
スプール弁の切替えの動きを確実にすることが必
要である。このため、ダイアフラムポンプに圧縮
空気の供給を開始してポンプを始動させる時は、
このダイアフラムポンプに作動空気を送り込む減
圧弁は、最低圧力を保持し、それ以下では減圧弁
からダイアフラムポンプへ供給されない構成とす
る。[Means for solving the problem] By increasing the pressure of the working air to a certain degree,
It is necessary to ensure the switching movement of the spool valve. Therefore, when starting the pump by supplying compressed air to the diaphragm pump,
The pressure reducing valve that sends working air to this diaphragm pump is configured to maintain a minimum pressure, and below which pressure is not supplied from the pressure reducing valve to the diaphragm pump.
更に、作動空気源と減圧弁の間に抜気孔付三方
弁をセツトし、ダイアフラムポンプに作動空気を
送らない時、すなわち、ダイアフラムポンプの作
動を終了させる停止時は、抜気孔付三方弁の通路
を切り換えて空気源からの供給を停止することに
よつて、スプール弁を通して作動空気室並びにス
プール弁の残存空気を抜気孔付三方弁の抜気孔よ
り外部へ排気する。これによつて、停止時は必ず
スプール弁、作動空気室内を大気圧にもどすた
め、大気圧に至るまでの低圧の残存空気によつ
て、スプール弁を押し、スプール弁が途中位置で
停止してしまう不確実な作動を防止し得るととも
に、次の再駆動時の確実な作動に備えることがで
きる。 Furthermore, a three-way valve with a vent hole is set between the working air source and the pressure reducing valve, and when the working air is not being sent to the diaphragm pump, that is, when the diaphragm pump is stopped to end its operation, the passage of the three-way valve with a vent hole is set between the working air source and the pressure reducing valve. By switching to stop the supply from the air source, residual air in the working air chamber and the spool valve is exhausted to the outside through the air vent hole of the three-way valve with air vent hole. As a result, when stopping, the spool valve and the working air chamber are always returned to atmospheric pressure, so the spool valve is pushed by the low-pressure remaining air until it reaches atmospheric pressure, and the spool valve stops at an intermediate position. It is possible to prevent unreliable operation due to erroneous operation, and to prepare for reliable operation at the next re-driving.
［実施例］
本考案の１実施例を図面より説明する。第１図
は全体の作動エアー回路図であり、ダイアフラム
ポンプ５のダイアフラム４は、パイロツトエアー
式スプール弁１２によつて作動空気が交互に左右
の作動空気室７に供給され、連続的に往復移動す
る。パイロツトエアー式スプール弁１２への圧縮
空気供給は、空気源２１より抜気孔付三方弁２２
を介し、減圧弁２３を経て供給される。抜気孔付
三方弁２２は、ダイアフラムポンプの作動中、第
４図の左図に示すように、右側に接続された空気
源２１から圧縮空気が供給され、左側に接続され
た減圧弁２３側に圧縮空気が送出されるようにな
つており、ダイアフラムポンプの作動の停止時、
第４図の右図に示すように通路を切り換えること
によつて、空気源２１から減圧弁２３への供給を
停止するとともに、減圧弁２３側の残圧を抜気孔
２４から大気へ排気し、ダイアフラムポンプの作
動空気室７とスプール弁１２へ連絡するパイロツ
トエアー通路１３内を大気圧の状態とする構造の
ものである。[Example] An example of the present invention will be described with reference to the drawings. FIG. 1 is an overall working air circuit diagram, in which the diaphragm 4 of the diaphragm pump 5 is continuously moved back and forth, with working air being alternately supplied to the left and right working air chambers 7 by a pilot air type spool valve 12. do. Compressed air is supplied to the pilot air type spool valve 12 from an air source 21 through a three-way valve 22 with a vent hole.
It is supplied via the pressure reducing valve 23. During operation of the diaphragm pump, the three-way valve 22 with a vent hole is supplied with compressed air from the air source 21 connected to the right side, and is supplied with compressed air to the pressure reducing valve 23 side connected to the left side, as shown in the left diagram of FIG. Compressed air is delivered and when the diaphragm pump stops operating,
By switching the passage as shown in the right diagram of FIG. 4, the supply from the air source 21 to the pressure reducing valve 23 is stopped, and the residual pressure on the pressure reducing valve 23 side is exhausted to the atmosphere from the vent hole 24. It is of a structure in which the inside of the pilot air passage 13 communicating with the working air chamber 7 of the diaphragm pump and the spool valve 12 is kept at atmospheric pressure.
次に第２図、第３図に於いて、１はダイアフラ
ム式ポンプ本体で、該ダイアフラムポンプ本体の
中央に穿設した軸孔２に作動軸３を挿通し、該作
動軸３の両端にダイアフラム４，４を備えたダイ
アフラムポンプ５を構成するとともに、各ダイア
フラム４は本体端のケーシング部１ａを２分区画
し、ポンプ室６と作動空気室７を夫々の側に形成
している。該ポンプ室６には吸込弁８と吐出弁９
が両側に設けられ、作動空気室７には作動孔１０
が臨んでいる。また、作動軸３の両端部には細径
部１１，１１を一方の作動端部に達したとき、そ
の作動空気室７と連通すると共に、他方を非連通
となる位置に夫々形成している。この細径部１
１，１１の摺動部にはパイロツトエアー式スプー
ル弁１２に導くように本体１に穿設されたパイロ
ツトエアー通路１３，１３が軸穴２に臨み、該パ
イロツトエアー通路１３，１３はダブルパイロツ
ト式５ポートスプール弁１２のスプール１４のピ
ストン１４ａ，１４ｂの両端に連通するようにそ
れぞれ構成されている。１５，１６は細径部１１
の前後に配された洩防止のＶパツキンとＯリング
である。次に、このダイアフラムポンプ５の作動
を説明すると、先ずこのダイアフラムポンプ５は
左右の作動空気室７，７に交互に圧縮空気を送り
込むことによつて、左右のポンプ室６，６に吸
込、吐出を交互に行わせ、ポンプ全体として常に
吐出を行わせるようにしたものである。例えば、
右側のポンプ室６が吸込みの場合は、左側のポン
プ室６では吐出が行われる。このとき、作動空気
室７，７より交互に繰出されるパイロツトエアー
でスプール弁１２が制御される。即ち、作動軸３
の移動によつて作動空気室７内に一定以上作動軸
３が入り込むと、該作動軸３の作動端部の細径部
１１が軸孔２より外れて作動空気室７部に端部が
臨み、作動空気室７とパイロツトエアー通路１３
とが、細径部１１を介して連通状態となるため
（第３図参照）、該作動空気室７内の圧縮空気が細
径部１１に入り込み、これがパイロツトエアーと
してスプール弁１２に送られる。このパイロツト
エアーの取入れは、作動軸３の両端に等しく形成
された細径部１１と、夫々の作動空気室７との連
通により交互に為されるため、円滑なパイロツト
エアーの制御が出来る。 Next, in FIGS. 2 and 3, 1 is a diaphragm type pump body, an operating shaft 3 is inserted into a shaft hole 2 bored in the center of the diaphragm pump body, and a diaphragm is attached to both ends of the operating shaft 3. Each diaphragm 4 divides the casing portion 1a at the end of the main body into two parts, and forms a pump chamber 6 and a working air chamber 7 on each side. The pump chamber 6 has a suction valve 8 and a discharge valve 9.
are provided on both sides, and an operating hole 10 is provided in the operating air chamber 7.
is coming. In addition, narrow diameter portions 11, 11 are formed at both ends of the operating shaft 3 at positions that communicate with the operating air chamber 7 when one of the operating ends is reached, and do not communicate with the other end. . This narrow diameter part 1
At the sliding parts 1 and 11, pilot air passages 13 and 13 bored in the main body 1 to lead to the pilot air type spool valve 12 face the shaft hole 2, and the pilot air passages 13 and 13 are double pilot type. The pistons 14a and 14b of the spool 14 of the 5-port spool valve 12 are configured to communicate with both ends of the pistons 14a and 14b, respectively. 15 and 16 are the narrow diameter portions 11
There are V gaskets and O-rings placed on the front and back to prevent leakage. Next, to explain the operation of this diaphragm pump 5, firstly, this diaphragm pump 5 alternately sends compressed air to the left and right working air chambers 7, 7, thereby sucking in and discharging air to the left and right pump chambers 6, 6. This is done alternately so that the pump as a whole always discharges. for example,
When the pump chamber 6 on the right side is for suction, the pump chamber 6 on the left side is for discharge. At this time, the spool valve 12 is controlled by pilot air alternately delivered from the working air chambers 7,7. That is, the operating shaft 3
When the actuating shaft 3 enters the working air chamber 7 by a certain amount or more due to the movement of the actuating shaft 3, the narrow diameter portion 11 at the working end of the actuating shaft 3 comes out of the shaft hole 2 and the end faces the working air chamber 7. , working air chamber 7 and pilot air passage 13
are in communication via the narrow diameter portion 11 (see FIG. 3), so compressed air within the working air chamber 7 enters the narrow diameter portion 11 and is sent to the spool valve 12 as pilot air. This intake of pilot air is performed alternately through communication between the narrow diameter portions 11 equally formed at both ends of the operating shaft 3 and the respective operating air chambers 7, so that smooth control of the pilot air can be achieved.
尚、このパイロツトエアー式スプール弁１２の
作用を詳述すれば、ａポートにパイロツトエアー
が供給されると、ピストン１４ａが押圧されスプ
ール弁１４が右側に移動し、流路を切換え、ｂポ
ートとｃポート、ｄポートｅポートが通じ、パイ
ロツトエアーを排気してもパイロツトエアー式ス
プール弁１４はそのままの位置を保持する。ま
た、逆にｆポートにパイロツトエアーが供給され
ると、ピストン１４ｂが押圧され、スプール弁１
４が左側に移動し流路を切換え、ｂポートとｄポ
ート、ｃポートとｇポートが通じるものとなる。 In addition, to explain the operation of this pilot air type spool valve 12 in detail, when pilot air is supplied to the a port, the piston 14a is pressed and the spool valve 14 moves to the right, switching the flow path and connecting it to the b port. The c port, d port and e port are in communication, and the pilot air type spool valve 14 maintains its position even if the pilot air is exhausted. Conversely, when pilot air is supplied to the f port, the piston 14b is pressed and the spool valve 1
4 moves to the left side and switches the flow path, so that the b port and the d port, and the c port and the g port communicate with each other.
作動用圧縮空気は第１図並びに第４図に示す如
く、空気源２１より抜気孔付三方弁２２を通して
減圧弁２３に送られ、この減圧弁２３で作動圧力
を調整した後、スプール弁１２のｂに導入され
る。減圧弁２３は吐出側最低圧力が決められ、こ
れが維持できるものが用いられている。本実施例
では１Kg／cm2以上でなければ吐出されない構造と
している。 As shown in FIGS. 1 and 4, compressed air for operation is sent from an air source 21 through a three-way valve 22 with a vent hole to a pressure reducing valve 23, and after adjusting the operating pressure with this pressure reducing valve 23, the spool valve 12 is b. The minimum pressure on the discharge side is determined for the pressure reducing valve 23, and a valve that can maintain this is used. In this embodiment, the structure is such that the discharge is not performed unless the amount is 1 Kg/cm 2 or more.
今、ダイアフラムポンプ５を始動させる時は、
まず、抜気孔付三方弁２２を第４図の左図に示す
位置とし、かつ、減圧弁２３の設定圧力を１Kg／
cm2と設定しておくと、作動空気室７には、１Kg／
cm2の高い圧力が供給され、作動軸３の移動によ
り、パイロツトエアー通路１３を介してスプール
弁の一方のピストンに１Kg／cm2の高い圧力が供給
されるため、確実にスプール弁の切り換えがなさ
れる。 Now, when starting the diaphragm pump 5,
First, place the three-way valve 22 with a vent hole in the position shown in the left diagram of Fig. 4, and set the pressure of the pressure reducing valve 23 to 1 kg/kg.
cm 2 , the working air chamber 7 will have 1 kg/kg.
A high pressure of 1 kg/cm 2 is supplied, and as the operating shaft 3 moves, a high pressure of 1 kg/cm 2 is supplied to one piston of the spool valve via the pilot air passage 13, so the spool valve can be switched reliably. It will be done.
又、ダイアフラムポンプ５の停止時は、抜気孔
付三方弁２２を第４図の右図に示す位置とするこ
とによつて、減圧弁２３、作動空気室７、パイロ
ツトエアー通路１３内の圧縮空気が抜気され、大
気圧の状態になる。これによつて、１Kg／cm2未満
の残存空気によるスプール弁の不確実な作動を防
ぎ、押す力の不足で生じるスプール弁の作動切換
不良を防止できる。 When the diaphragm pump 5 is stopped, the compressed air in the pressure reducing valve 23, the working air chamber 7, and the pilot air passage 13 is removed by setting the three-way valve 22 with a vent hole to the position shown in the right diagram of FIG. is vented and becomes atmospheric pressure. This prevents unreliable operation of the spool valve due to residual air of less than 1 kg/cm 2 and prevents malfunction of the spool valve due to insufficient pushing force.
［考案の効果］
以上の如く本考案は、パイロツトエアー式スプ
ール弁によつて、交互に作動空気を送り、ダイア
フラムポンプを作動させる場合、最低圧力を保持
する減圧弁により、スプール弁、ダイアフラムポ
ンプにある程度の高圧の圧縮空気を供給できるた
め、１Kg／cm2未満の低圧域で起こりやすいスプー
ル弁の切替不良が防止でき、作動中に不都合が生
ずることなく安定した作業が行える。また、抜気
孔付三方弁を第４図の右図に示す如く閉じた際、
ダイアフラムポンプの作動空気室の内圧を抜気す
ることができるため、作動空気室の１Kg／cm2未満
の残圧によるスプール弁の不確実な移動を防止で
きる。よつて、再度、圧縮空気を空気源から供給
して行う駆動を円滑に行うことができるなど取扱
い上の不都合を大きく改善することが出来る。[Effects of the invention] As described above, in the present invention, when operating a diaphragm pump by sending working air alternately using a pilot air type spool valve, a pressure reducing valve that maintains the minimum pressure is used to control the spool valve and diaphragm pump. Since compressed air at a certain level of high pressure can be supplied, it is possible to prevent spool valve switching failures that tend to occur in the low pressure range of less than 1 kg/cm 2 , and stable work can be performed without any inconvenience during operation. Also, when the three-way valve with vent hole is closed as shown in the right diagram of Figure 4,
Since the internal pressure of the working air chamber of the diaphragm pump can be vented, it is possible to prevent the spool valve from moving unreliably due to residual pressure of less than 1 kg/cm 2 in the working air chamber. Therefore, inconveniences in handling can be greatly improved, such as smooth driving by supplying compressed air from the air source again.
第１図は、本考案の一実施例を示すポンプ駆動
のエアー回路図、第２図は、同じくダイアフラム
ポンプの構造を示す半断面図、第３図は第２図ダ
イアフラムポンプの作動を示す機構図、第４図
は、抜気孔付三方弁のそれぞれの流れを示すもの
である。
４……ダイアフラム、７……作動空気室、１２
……スプール弁、１３……パイロツトエアー通
路、２１……空気源、２２……抜気孔付三方弁、
２３……減圧弁。
Fig. 1 is a pump drive air circuit diagram showing an embodiment of the present invention, Fig. 2 is a half-sectional view showing the structure of the diaphragm pump, and Fig. 3 is a mechanism showing the operation of the diaphragm pump shown in Fig. 2. Figure 4 shows the respective flows of the three-way valve with air vent. 4...Diaphragm, 7...Working air chamber, 12
... Spool valve, 13 ... Pilot air passage, 21 ... Air source, 22 ... Three-way valve with vent hole,
23...Pressure reducing valve.
Claims (1)
空気室７をそれぞれ両側に配し、両ダイアフラム
４，４を作動軸３で連結し、さらに、パイロツト
エアー式スプール弁１２の供給口ｃ，ｄより両作
動空気室７，７に交互に作動空気を供給すると共
に、一方の作動空気室７に供給空気が連通してい
る時は、他方の作動空気室７は排気通路と連通さ
せ、一方のダイアフラム４の作動終端近くで、パ
イロツトエアー式スプール弁１２のパイロツトエ
アー通路１３と一方の作動空気室７とを連通させ
ることによつて交互に往復動させ、吸込、吐出を
繰り返す複動式ダイアフラムポンプにおいて、前
記パイロツトエアー式スプール弁１２の供給口ｂ
を最低圧力を保持する減圧弁２３と抜気孔付三方
弁２２を介して作動空気源２１に接続してなるダ
イアフラムポンプの作動装置。 A pump chamber 6 and a working air chamber 7 separated by a diaphragm 4 are arranged on both sides, and both diaphragms 4, 4 are connected by a working shaft 3. Working air is alternately supplied to the working air chambers 7, 7, and when the supply air is in communication with one of the working air chambers 7, the other working air chamber 7 is communicated with the exhaust passage, and one of the diaphragms 4 In a double-acting diaphragm pump that alternately reciprocates and repeats suction and discharge by communicating the pilot air passage 13 of the pilot air spool valve 12 with one working air chamber 7 near the end of operation. Supply port b of the pilot air type spool valve 12
A diaphragm pump operating device which is connected to a working air source 21 via a pressure reducing valve 23 that maintains the lowest pressure and a three-way valve 22 with a vent hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987076275U JPH0519591Y2 (en) | 1987-05-21 | 1987-05-21 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987076275U JPH0519591Y2 (en) | 1987-05-21 | 1987-05-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63186983U JPS63186983U (en) | 1988-11-30 |
| JPH0519591Y2 true JPH0519591Y2 (en) | 1993-05-24 |
Family
ID=30923203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987076275U Expired - Lifetime JPH0519591Y2 (en) | 1987-05-21 | 1987-05-21 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0519591Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0310942D0 (en) * | 2003-05-13 | 2003-06-18 | Itw Ltd | Diaphragm pump system |
| KR101138133B1 (en) * | 2010-05-19 | 2012-04-23 | 배방희 | Driving unit for diaphragm pump and diaphragm pump using the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5461302A (en) * | 1977-10-24 | 1979-05-17 | Taisuke Kitagawa | Aerodynamic diaphragm pump |
-
1987
- 1987-05-21 JP JP1987076275U patent/JPH0519591Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5461302A (en) * | 1977-10-24 | 1979-05-17 | Taisuke Kitagawa | Aerodynamic diaphragm pump |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63186983U (en) | 1988-11-30 |
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