JPS6253721B2 - - Google Patents
Info
- Publication number
- JPS6253721B2 JPS6253721B2 JP8195181A JP8195181A JPS6253721B2 JP S6253721 B2 JPS6253721 B2 JP S6253721B2 JP 8195181 A JP8195181 A JP 8195181A JP 8195181 A JP8195181 A JP 8195181A JP S6253721 B2 JPS6253721 B2 JP S6253721B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- oil
- pressure oil
- tank
- valve
- 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
- 238000001514 detection method Methods 0.000 claims description 13
- 239000003921 oil Substances 0.000 description 129
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
- F15B1/265—Supply reservoir or sump assemblies with pressurised main reservoir
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は水力発電所の圧油装置に係り、特にア
ンローダパルブの切り換わりにより、圧油ポンプ
を起動停止させて圧油タンクに空気補給を確実に
行ない圧油タンクの油面上昇を防止するようにし
た圧油装置に関する。Detailed Description of the Invention [Objective of the Invention] (Industrial Field of Application) The present invention relates to a pressure oil system for a hydroelectric power plant, and in particular, starts and stops a pressure oil pump by switching an unloader valve, thereby reducing pressure oil. This invention relates to a pressure oil device that reliably supplies air to the tank and prevents the oil level from rising in the pressure oil tank.
（従来の技術）
従来の圧油装置のアンロード状態が第１図に示
されている。(Prior Art) An unloaded state of a conventional pressure oil device is shown in FIG.
第１図において、符号１は圧油タンクであり、
その圧油タンク１には内部の油圧に応じて動作す
る圧力スイツチ２が設けられている。 In FIG. 1, numeral 1 is a pressure oil tank;
The pressure oil tank 1 is provided with a pressure switch 2 that operates according to the internal oil pressure.
また、圧油タンク１にはパイロツトバルブ３を
介してアンローダバルブ４が接続されている。そ
のパイロツトバルブ３は圧油タンク１内の油圧を
検出してアンローダバルブ４をアンロード状態と
オンロード状態に切り換えるように動作させる。
貯油タンク５に接続された圧油ポンプ６はアンロ
ーダバルブ４を介して空気タンク７と主回路８に
接続されている。その空気タンク７と主回路８は
それぞれ逆止弁９，１０を介して圧油タンク１に
接続されている。 Further, an unloader valve 4 is connected to the pressure oil tank 1 via a pilot valve 3. The pilot valve 3 detects the oil pressure in the pressure oil tank 1 and operates the unloader valve 4 to switch between an unload state and an on-load state.
A pressure oil pump 6 connected to the oil storage tank 5 is connected to an air tank 7 and a main circuit 8 via an unloader valve 4. The air tank 7 and main circuit 8 are connected to the pressure oil tank 1 via check valves 9 and 10, respectively.
また、空気タンク７はアンローダバルブ４の切
り換え動作により開閉する空気吸入弁１１を介し
て貯油タンク５に接続されている。 Further, the air tank 7 is connected to the oil storage tank 5 via an air suction valve 11 that is opened and closed by the switching operation of the unloader valve 4.
更に、圧油タンク１にアンローダバルブ４の切
り換え動作により開閉する空気排出弁１２が接続
されている。 Further, an air discharge valve 12 is connected to the pressure oil tank 1 and is opened and closed by switching operation of the unloader valve 4.
このような従来の圧油装置にあつては主機運転
中には圧油ポンプ６は連続運転されている。 In such a conventional pressure oil system, the pressure oil pump 6 is continuously operated while the main engine is operating.
そして、圧油タンク１内の油圧が高い場合には
圧油タンク１内の油圧を検出するパイロツトバル
ブ３の圧力変化によつてアンローダバルブ４がア
ンロード状態に切換えられる。 When the oil pressure in the pressure oil tank 1 is high, the unloader valve 4 is switched to the unload state based on the pressure change of the pilot valve 3 that detects the oil pressure in the pressure oil tank 1.
このとき、空気タンク７内の油はアンローダバ
ルブ４より貯油タンク５内に排出され、空気吸入
弁１１を開いて空気と置換される。また、圧油ポ
ンプ６によつて貯油タンク５に吸上げられた油は
再び貯油タンク５に戻されるように循環してい
る。 At this time, the oil in the air tank 7 is discharged from the unloader valve 4 into the oil storage tank 5, and is replaced with air by opening the air intake valve 11. Further, the oil sucked into the oil storage tank 5 by the pressure oil pump 6 is circulated so as to be returned to the oil storage tank 5 again.
次に、圧油タンク１内の油圧が低下した場合に
は、パイロツトバルブ３の圧力変化によつてアン
ローダバルブ４がオンロード状態に切り換えられ
る。 Next, when the oil pressure in the pressure oil tank 1 decreases, the unloader valve 4 is switched to the on-load state due to a change in the pressure of the pilot valve 3.
このとき、圧油ポンプ６によつて貯油タンク５
から吸上げられた圧油は主回路８、逆止弁１０を
通り圧油タンク１に補給される。また、空気吸入
弁１１が閉じられており、このとき空気タンク７
内の空気は、圧油の流入によつて徐々に圧縮され
て逆止弁９を開き、圧油タンク１に補給される。 At this time, the oil storage tank 5 is
The pressure oil sucked up from the main circuit 8 and the check valve 10 is supplied to the pressure oil tank 1. Also, the air intake valve 11 is closed, and at this time the air tank 7
The air inside is gradually compressed by the inflow of pressure oil, opens the check valve 9, and is replenished into the pressure oil tank 1.
そして、圧油タンク１内の油圧が上昇し、アン
ローダバルブ４がオンロード状態からアンロード
状態に切り換わる圧力（以下アンロード圧力とい
う）になり、圧油タンク１内の空気が過剰で油面
が低いときには空気吸入弁１１と同様に空気排出
弁１２が開いて空気を排出して油面を調整する。
その油面の調整後、圧油タンク１内の油圧がアン
ロード圧力を越えると、アンローダバルブ４がオ
ンロード状態からアンロード状態に切り換えられ
る。 Then, the oil pressure in the pressure oil tank 1 rises to a pressure at which the unloader valve 4 switches from the on-load state to the unload state (hereinafter referred to as unload pressure), and the air in the pressure oil tank 1 becomes excessive and the oil level When the oil level is low, the air exhaust valve 12 opens like the air intake valve 11 to exhaust air and adjust the oil level.
After adjusting the oil level, when the oil pressure in the pressure oil tank 1 exceeds the unload pressure, the unloader valve 4 is switched from the on-load state to the unload state.
このようにオンロードとアンロードの繰り返し
により、圧油タンク１内の油面と油圧は規定範囲
内に保持される。 By repeating on-loading and unloading in this way, the oil level and oil pressure in the pressure oil tank 1 are maintained within a specified range.
ところで、主機運転停止時には圧油タンク１に
おける消費量が少ないため、圧油ポンプ６は、圧
力スイツチ２による間欠運転が行われる。 By the way, since the consumption amount in the pressure oil tank 1 is small when the main engine is stopped, the pressure oil pump 6 is operated intermittently by the pressure switch 2.
このとき、圧力スイツチ２のOFF圧力を第２
図中ａの例に破線で示す如く、アンロード圧力P1
より上に設定すると、アンローダバルブ４はアン
ロード圧力でアンロード状態に切り換わるが圧力
スイツチ２はOFFにならないので、圧油ポンプ
６は連続運転となつてしまう。また、同じ圧力に
設定した場合にも圧力スイツチの誤差や経年変化
があるため、圧力スイツチ２のOFF圧力をアン
ロード圧力よりやや下に設定するのが普通であ
る。 At this time, set the OFF pressure of pressure switch 2 to the second
As shown by the broken line in the example of a in the figure, the unloading pressure P 1
If it is set higher, the unloader valve 4 is switched to the unload state by the unload pressure, but the pressure switch 2 is not turned off, so the pressure oil pump 6 is in continuous operation. Furthermore, even if the pressure is set at the same pressure, there are errors in the pressure switch and changes over time, so it is normal to set the OFF pressure of pressure switch 2 slightly below the unloading pressure.
（発明が解決しようとする問題点）
そこで、圧力スイツチ２のOFF圧力P2を第２
図中ｂの例に破線で示す如く、アンロード圧力よ
り下に設定したと仮定する。(Problem to be solved by the invention) Therefore, the OFF pressure P2 of the pressure switch 2 is
Assume that the pressure is set below the unloading pressure, as shown by the broken line in the example b in the figure.
この場合、圧力スイツチ２がONすれば圧油ポ
ンプ６によつて圧油が圧油タンク１内に補給さ
れ、圧力スイツチ２がOFF圧力に上昇すると、
圧油ポンプ６が停止し、圧油の補給は停止され
る。しかし、圧油タンク１内の油圧はアンロード
圧力に達しないため、アンローダバルブ４はアン
ロード状態に切換わらず、オンロード状態のまま
である。 In this case, when the pressure switch 2 is turned on, pressure oil is replenished into the pressure oil tank 1 by the pressure oil pump 6, and when the pressure switch 2 is raised to the OFF pressure,
The pressure oil pump 6 is stopped, and the supply of pressure oil is stopped. However, since the oil pressure in the pressure oil tank 1 does not reach the unload pressure, the unloader valve 4 does not switch to the unload state and remains in the on-load state.
なお、P3は圧力スイツチのON圧力を示し、P1
とP3間がアンローダバルブ動作範囲となる。 In addition, P 3 indicates the ON pressure of the pressure switch, and P 1
The unloader valve operating range is between and P3 .
したがつて、圧油ポンプ６の停止時に空気タン
ク７内の油はアンローダバルブ４より貯油タンク
５内に排出されない。また、空気吸入弁１１は閉
じたままであるため、空気タンク７内の油は空気
と置換できない。この状態から圧油タンク１内の
圧力が各機器からの漏油により低下すると、圧力
スイツチ２がON圧力となり、圧油ポンプ６が再
び起動して圧油タンク１内に圧油が補給される
が、空気タンク７内には空気が補給されていない
ため、漏気によつて圧油タンク１内の油面が規定
油面より上昇するという欠点があつた。 Therefore, the oil in the air tank 7 is not discharged into the oil storage tank 5 from the unloader valve 4 when the pressure oil pump 6 is stopped. Furthermore, since the air intake valve 11 remains closed, the oil in the air tank 7 cannot be replaced with air. When the pressure inside the pressure oil tank 1 decreases from this state due to oil leakage from each device, the pressure switch 2 turns ON pressure, the pressure oil pump 6 starts up again, and pressure oil is replenished into the pressure oil tank 1. However, since the air tank 7 was not replenished with air, there was a drawback that the oil level in the pressure oil tank 1 rose above the specified oil level due to air leakage.
本発明は上記の欠点を解消し、アンローダバル
ブの切り換りにより、圧油ポンプを起動停止させ
て圧油タンクに空気補給を確実に行つて圧油タン
クの油面上昇を防止する圧油装置を提供すること
を目的とする。 The present invention solves the above-mentioned drawbacks, and the present invention is a pressure oil device that starts and stops the pressure oil pump by switching the unloader valve to reliably supply air to the pressure oil tank and prevent the oil level from rising in the pressure oil tank. The purpose is to provide
（問題点を解決するための手段）
本発明は、上記目的を達成するため、圧油タン
クと、上記圧油タンクに接続された油圧の変動に
応動して切換わるパイロツトバルブとを備え、圧
油タンクが高圧となつた場合パイロツトバルブに
よつてアンローダバルブが圧油ポンプからの油を
貯油タンクに循環させるとともに空気タンクの油
を貯油タンクに戻す回路に切換え、圧油タンクが
低圧となつた場合パイロツトバルブによつてアン
ローダバルブが圧油ポンプからの油を主回路を経
て圧油タンクに供給するとともに空気タンクの空
気を圧油タンクに供給する回路に切換えるよう構
成した圧油装置において、上記アンローダバルブ
をアンロード状態にするためにパイロツトバルブ
から該アンローダバルブに延びる回路中に、主機
運転停止中はアンローダバルブの動作に連動して
圧油ポンプの起動を停止させる、例えば圧力スイ
ツチ等の検知スイツチを設けたものである。
(Means for Solving the Problems) In order to achieve the above object, the present invention includes a pressure oil tank and a pilot valve that is connected to the pressure oil tank and switches in response to fluctuations in oil pressure. When the pressure in the oil tank becomes high, the pilot valve switches the unloader valve to a circuit that circulates the oil from the pressure oil pump to the oil storage tank and returns the oil in the air tank to the oil storage tank, and the pressure in the pressure oil tank becomes low. In a pressure oil system configured such that a pilot valve causes an unloader valve to supply oil from a pressure oil pump to a pressure oil tank via a main circuit, and switch the circuit to supply air from an air tank to a pressure oil tank, In the circuit extending from the pilot valve to the unloader valve to put the unloader valve into the unload state, there is a detection device, such as a pressure switch, that stops the activation of the pressure oil pump in conjunction with the operation of the unloader valve while the main engine is stopped. It is equipped with a switch.
（作用）
而して、主機運転中においては、圧油ポンプを
連続運転させ、主機運転停止中でアンローダバル
ブがアンロード状態になつた時にのみ、これを連
動する圧力スイツチ等の検知スイツチを介して圧
油ポンプの起動を停止させるものである。(Function) Therefore, while the main engine is operating, the pressure oil pump is operated continuously, and only when the main engine is stopped and the unloader valve is in the unload state, the pressure oil pump is operated via a detection switch such as a pressure switch that interlocks the unloader valve. This is to stop the pressure oil pump from starting.
（実施例）
以下図面を参照して本発明の実施例について説
明する。(Example) Examples of the present invention will be described below with reference to the drawings.
第３図に本実施例を示すが、前記従来例と同一
の構成は同一符号を付して説明を省略し、前記従
来例と相違する構成について説明する。 The present embodiment is shown in FIG. 3, and the same components as the conventional example are given the same reference numerals and the explanation thereof will be omitted, and only the structures different from the conventional example will be explained.
本実施例では第３図に示す如く、従来例の圧油
タンク１に設けられていた圧力スイツチ２を検知
スイツチとして、アンローダバルブ４をアンロー
ド状態にするためにパイロツトバルブ３から該ア
ンローダバルブ４に延びるパイロツト回路１３の
途中に分岐して設け、アンローダバルブ４の動作
に連動して、この圧力スイツチ２が作動し、主機
運転停止中で、かつアンローダダルブ４がアンロ
ード状態になつたとき、この圧力スイツチ２の作
動により圧油ポンプ６の起動を停止するようにし
たものである。 In this embodiment, as shown in FIG. 3, the pressure switch 2 provided in the pressure oil tank 1 of the conventional example is used as a detection switch, and in order to bring the unloader valve 4 into the unloaded state, a pilot valve 3 to the unloader valve 4 is used as a detection switch. The pressure switch 2 is provided as a branch in the middle of the pilot circuit 13 extending to the main engine, and is activated in conjunction with the operation of the unloader valve 4 when the main engine is stopped and the unloader valve 4 is in the unloading state. , the activation of the pressure oil pump 6 is stopped by the operation of the pressure switch 2.
次にかかる構成の圧油装置の作用について説明
する。 Next, the operation of the pressure oil device having such a configuration will be explained.
主機運転中には、圧油ポンプ６のモータ回路は
圧力スイツチ２によつては影響を受けないように
なつており、従来例と同様に連続運転され、アン
ローダバルブ４のオンロードとアンロードの繰り
返しにより、圧油タンク１内の油面と油圧は規定
範囲内に保持される。 During operation of the main engine, the motor circuit of the pressure oil pump 6 is not affected by the pressure switch 2, and is operated continuously as in the conventional example, and the on-load and unload of the unloader valve 4 is controlled. By repeating this process, the oil level and oil pressure in the pressure oil tank 1 are maintained within a specified range.
しかし、主機運転停止時には圧油ポンプ６のモ
ータ駆動回路が圧力スイツチ２により切り換えら
れるため、次のように作用する。 However, since the motor drive circuit of the pressure oil pump 6 is switched by the pressure switch 2 when the main engine is stopped, the following operation occurs.
圧油タンク１内の油圧が高い場合には、アンロ
ーダバルブ４はアンロード状態に切り換えられて
おり、圧力スイツチ２の接点もパイロツトバルブ
３からの圧力変化により、アンローダバルブ４と
連動してOFFに切換わり、このとき圧油ポンプ
６は停止の状態にある。 When the oil pressure in the pressure oil tank 1 is high, the unloader valve 4 is switched to the unload state, and the contact of the pressure switch 2 is also turned OFF in conjunction with the unloader valve 4 due to the pressure change from the pilot valve 3. At this time, the pressure oil pump 6 is in a stopped state.
次に、圧油タンク１内の油圧が低い場合には、
アンローダバルブ４はアンロード状態からオンロ
ード状態に切り換えられており、圧力スイツチ２
の接点もパイロツトバルブ３からの圧力変化によ
り、アンローダバルブ４と連動してONに切換わ
り、このとき、圧油ポンプ６は起動の状態とな
る。 Next, if the oil pressure in the pressure oil tank 1 is low,
The unloader valve 4 is switched from the unload state to the on-load state, and the pressure switch 2
Due to the pressure change from the pilot valve 3, the contact is also switched to ON in conjunction with the unloader valve 4, and at this time, the pressure oil pump 6 is activated.
このように圧力スイツチ２はパイロツトバルブ
３の圧力変動幅が大きいのでラフな設定でスイツ
チング動作する。 As described above, the pressure switch 2 performs switching operation with rough settings because the pressure fluctuation range of the pilot valve 3 is large.
そして、アンローダバルブ４がオンロード状態
の時には、圧油ポンプ６が起動し、アンローダバ
ルブ４がアンロード状態の時には圧油ポンプ６が
停止するという動作が確実に行われる。アンロー
ダバルブ４がアンロード状態の時には空気タンク
７内で空気と油を置換することができるため、オ
ンロード状態の時に空気タンク７から圧油タンク
１に確実に空気を補給する。 Then, when the unloader valve 4 is in the on-load state, the pressure oil pump 6 is started, and when the unloader valve 4 is in the unload state, the pressure oil pump 6 is stopped. Since air and oil can be replaced in the air tank 7 when the unloader valve 4 is in the unloaded state, air is reliably replenished from the air tank 7 to the pressure oil tank 1 during the on-loaded state.
本実施例ではアンローダバルブ４と連動して圧
油ポンプ６を起動停止させるために、パイロツト
バルブ３とアンローダバルブ４を接続するパイロ
ツト回路１３に圧力変化に検出する圧力スイツチ
２を検知スイツチとして設けているが、パイロツ
トバルブ３の圧力変化に対応して動作するリミツ
トスイツチ等を設け、そのストローク動作を検出
するようにしてもよい。このときにもアンローダ
バルブの動作幅が大きいのでラフな設定で動作ス
イツチがスイツチング動作する。 In this embodiment, in order to start and stop the pressure oil pump 6 in conjunction with the unloader valve 4, a pressure switch 2 that detects pressure changes is provided as a detection switch in the pilot circuit 13 that connects the pilot valve 3 and the unloader valve 4. However, it is also possible to provide a limit switch or the like that operates in response to changes in the pressure of the pilot valve 3, and to detect the stroke operation thereof. At this time as well, since the operating range of the unloader valve is large, the operation switch performs a switching operation with rough settings.
以上説明したように本発明の圧油装置はアンロ
ーダーバルブとパイロツトバルブとの間に主機運
転停止中はアンローダバルブの動作に連動して圧
油ポンプを起動停止させる検知スイツチを設けて
いるので、アンローダーバルブの切り換わりを検
知スイツチで検出して圧油ポンプを起動停止さ
せ、圧油ポンプの停止時にはアンローダーバルブ
によつて空気タンク中の油が排出されると共に空
気吸入弁を開いてその油と補給される空気を置換
し、圧油ポンプの起動時にはアンローダバルブに
よつて圧油タンク内に空気タンクからの空気が確
実に補給されるため、圧油タンクにおける油面の
上昇が防止されるという効果を奏する。
As explained above, the pressure oil system of the present invention is provided with a detection switch between the unloader valve and the pilot valve that starts and stops the pressure oil pump in conjunction with the operation of the unloader valve while the main engine is stopped. The detection switch detects the switching of the unloader valve and starts and stops the pressure oil pump. When the pressure oil pump is stopped, the oil in the air tank is discharged by the unloader valve, and the air intake valve is opened to remove the oil. This system replaces the oil with the supplied air, and when the pressure oil pump is started, the unloader valve reliably supplies air from the air tank into the pressure oil tank, preventing the oil level from rising in the pressure oil tank. It has the effect of
また、アンローダバルブとパイロツトバルブと
の間にアンローダバルブの動作に連動する検知ス
イツチを設けており、この検知スイツチが例えば
圧力スイツチのときには、パイロツトバルブの圧
力変化幅が大きいので圧力スイツチに与える圧力
変化も大きく、ラフな設定で圧力スイツチがスイ
ツチング動作する。前記検知スイツチが例えばリ
ミツトスイツチ等の動作スイツチのときには、パ
イロツトバルブの圧力変化に対応して動作するア
ンローダバルブの動作幅が大きいためにラフな設
定でも動作スイツチがスイツチング動作し、いず
れの場合にもスイツチ設定がラフで済み、しかも
誤差、設定後のズレを考慮する必要がなくて調整
が非常に容易であるという効果を奏する。 In addition, a detection switch is provided between the unloader valve and the pilot valve that is linked to the operation of the unloader valve, and when this detection switch is a pressure switch, for example, the pressure change range of the pilot valve is large, so the pressure change applied to the pressure switch is The pressure switch is also large, and the pressure switch operates in a rough setting. When the detection switch is an operating switch such as a limit switch, the unloader valve, which operates in response to pressure changes in the pilot valve, has a large operating range, so the operating switch operates even under rough settings. This has the effect that settings can be made only roughly, and there is no need to consider errors or deviations after settings, making adjustment very easy.
第１図は従来の圧油装置のアンロード状態を示
す系統図、第２図は同圧油装置の主機運転停止中
における圧力スイツチの設定圧力とアンローダバ
ルブの動作範囲との関係を示す説明図、第３図は
本発明に係る圧油装置のアンロード状態を示す系
統図である。
１……圧油タンク、２……圧力スイツチ（検知
スイツチ）、３……パイロツトバルブ、４……ア
ンローダバルブ、６……圧油ポンプ。
Figure 1 is a system diagram showing the unloading state of a conventional pressure oil system, and Figure 2 is an explanatory diagram showing the relationship between the set pressure of the pressure switch and the operating range of the unloader valve when the main engine of the same pressure oil system is stopped. , FIG. 3 is a system diagram showing an unloaded state of the hydraulic oil device according to the present invention. 1... Pressure oil tank, 2... Pressure switch (detection switch), 3... Pilot valve, 4... Unloader valve, 6... Pressure oil pump.
Claims (1)
油圧の変動に応動して切換わるパイロツトバルブ
とを備え、圧油タンクが高圧となつた場合パイロ
ツトバルブによつてアンローダバルブが圧油ポン
プからの油を貯油タンクに循環させるとともに空
気タンクの油を貯油タンクに戻す回路に切換え、
圧油タンクが低圧となつた場合パイロツトバルブ
によつてアンローダバルブが圧油ポンプからの油
を主回路を経て圧油タンクに供給するとともに空
気タンクの空気を圧油タンクに供給する回路に切
換えるよう構成した圧油装置において、上記アン
ローダバルブをアンロード状態にするためにパイ
ロツトバルブから該アンローダバルブに延びるパ
イロツト回路中に、主機運転停止中はアンローダ
バルブの動作に連動して圧油ポンプの起動を停止
させる検知スイツチを設けたことを特徴とする圧
油装置。 ２ 前記検知スイツチとして圧力スイツチを用い
たことを特徴とする特許請求の範囲第１項に記載
の圧油装置。[Claims] 1. A pressure oil tank and a pilot valve connected to the pressure oil tank that switches in response to fluctuations in oil pressure, and when the pressure oil tank becomes high pressure, the unloader is activated by the pilot valve. The valve switches the circuit to circulate oil from the pressure oil pump to the oil storage tank and return oil from the air tank to the oil storage tank.
When the pressure in the pressure oil tank becomes low, the pilot valve causes the unloader valve to supply oil from the pressure oil pump to the pressure oil tank via the main circuit, and switch the circuit to supply air from the air tank to the pressure oil tank. In the constructed pressure oil system, a pilot circuit extending from the pilot valve to the unloader valve in order to bring the unloader valve into an unloading state includes a pilot circuit that starts the pressure oil pump in conjunction with the operation of the unloader valve when the main engine is stopped. A pressure oil device characterized by being equipped with a detection switch that stops the operation. 2. The pressure oil device according to claim 1, wherein a pressure switch is used as the detection switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8195181A JPS57195901A (en) | 1981-05-29 | 1981-05-29 | Pressurized oil system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8195181A JPS57195901A (en) | 1981-05-29 | 1981-05-29 | Pressurized oil system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57195901A JPS57195901A (en) | 1982-12-01 |
| JPS6253721B2 true JPS6253721B2 (en) | 1987-11-11 |
Family
ID=13760800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8195181A Granted JPS57195901A (en) | 1981-05-29 | 1981-05-29 | Pressurized oil system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57195901A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110778543A (en) * | 2019-11-06 | 2020-02-11 | 徐州徐工矿业机械有限公司 | Pneumatic pressurization system for hydraulic oil tank of engineering machinery |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102808814B (en) * | 2012-08-23 | 2015-10-21 | 上海汇益控制系统股份有限公司 | The charging pressure of accumulator on-line measuring device of hydraulic system |
-
1981
- 1981-05-29 JP JP8195181A patent/JPS57195901A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110778543A (en) * | 2019-11-06 | 2020-02-11 | 徐州徐工矿业机械有限公司 | Pneumatic pressurization system for hydraulic oil tank of engineering machinery |
| CN110778543B (en) * | 2019-11-06 | 2021-06-29 | 徐州徐工矿业机械有限公司 | Pneumatic pressurization system for hydraulic oil tank of engineering machinery |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57195901A (en) | 1982-12-01 |
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