JP2009167874A - Water draining method of water lubrication compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water draining method capable of surely preventing freezing, by draining water from a water system of a compressor, when there is a little or no demand of compressed gas in a supply destination of the compressed gas, without using an electric heater and a fan. <P>SOLUTION: This water draining method of the water lubrication compressor comprises a compressor body 1, a water separating recovery unit 4 interposed in a delivery flow passage 3 of this compressor body 1, a water circulating flow passage 5 supplying the water separated by this water separating recovery unit 4 to a water supply place 1c of the compressor body 1, and a water cooler 6 interposed in this water circulating flow passage 5. A circulating water draining flow passage 5a is arranged for branching off from the water circulating flow passage 5 between the water cooler 6 and the water supply place 1c of the compressor body 1, and a first drain opening-closing valve 5b is interposed in this circulating water draining flow passage 5a, and when stopping the compressor body 1, the water is drained by opening the first drain opening-closing valve 5b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、水潤滑圧縮機において、圧縮気体の供給先で圧縮気体の需要が少ないときもしくは無いときに、前記圧縮機の水循環流路等の水系統から水を抜き取る水抜き方法に関する。   The present invention relates to a water draining method for draining water from a water system such as a water circulation channel of the compressor when there is little or no demand for compressed gas at a compressed gas supply destination in a water lubricated compressor.

スクリュ圧縮機のスクリュロータ（以下、ロータとも言う）の温度は、吸込口から吸込まれた気体がロータ室内で圧縮されるのに伴って上昇する。従って、スクリュロータを冷却する冷却機構が必須である。この様な冷却機構として、一般的にスクリュロータを収納するロータ室に冷却液を供給することが従来より行われてきた。代表的なものとしては、上記冷却液に油を用いた油冷式スクリュ圧縮機がある。前記ロータ室に供給された油は、気体圧縮部の冷却と共に、スクリュロータ同士の間及びスクリュロータとロータケーシングの内壁部との間のシール及び潤滑の働きをしている。   The temperature of the screw rotor (hereinafter also referred to as the rotor) of the screw compressor rises as the gas sucked from the suction port is compressed in the rotor chamber. Therefore, a cooling mechanism for cooling the screw rotor is essential. As such a cooling mechanism, it has been conventionally performed to supply a cooling liquid to a rotor chamber that accommodates a screw rotor. A typical example is an oil-cooled screw compressor that uses oil as the coolant. The oil supplied to the rotor chamber functions as a seal and lubrication between the screw rotors and between the screw rotor and the inner wall portion of the rotor casing together with cooling of the gas compression portion.

しかしながら、この冷却液に油を用いると、圧縮機本体の吐出流路に介設された油分離回収器によって、圧縮された気体から油の分離回収が図られるものの、一部の油は吐出される圧縮気体と共にオイルミストとして供給先に同伴される。その結果、清浄な圧縮気体が要求される供給先、例えば、半導体等の電子部品、精密機械あるいは食品類等の製造工程においては、この油が工程や製品に付着してコンタミネーションを生じるという問題があった。   However, when oil is used for this cooling liquid, oil is separated and recovered from the compressed gas by the oil separator / collector provided in the discharge flow path of the compressor body, but part of the oil is discharged. Along with the compressed gas, it is accompanied to the supply destination as oil mist. As a result, in the manufacturing process of electronic parts such as semiconductors, precision machinery or foodstuffs where clean compressed gas is required, this oil may adhere to the process or product and cause contamination. was there.

この問題を解決するものとして、油を用いないドライ状態で運転可能なオイルフリー圧縮機が開発された。しかしながら、このオイルフリー圧縮機では、例えインバータ制御を行っても、圧縮機の低速回転域において圧縮効率が大幅に低下するという問題があった。そこで、冷却液に水を用いる水潤滑圧縮機が開発されるに至った。水潤滑圧縮機においては、油の変わりに水を用いて、上述した冷却、シール及び潤滑の働きをさせるもので、圧縮過程中の気体の漏れを防止できるので、低速域から高速域まで高効率な圧縮作用が得られ、ドライ方式に比べて約３０％以上の吐出容量が得られる。   In order to solve this problem, an oil-free compressor that can be operated in a dry state without using oil has been developed. However, this oil-free compressor has a problem that the compression efficiency is greatly reduced in the low-speed rotation region of the compressor even if inverter control is performed. Therefore, a water-lubricated compressor that uses water as a coolant has been developed. The water-lubricated compressor uses water instead of oil to perform the cooling, sealing, and lubrication functions described above, and can prevent gas leakage during the compression process. Thus, a discharge capacity of about 30% or more can be obtained as compared with the dry method.

水潤滑圧縮機に用いられる水は、上述した通常の油冷式圧縮機と同様、吐出流路に設けられた油分離回収器に相当する水分離回収器により分離回収され、回収された水は、水循環流路を通して再び圧縮機に供給される様に構成されている。ところが、冬季において圧縮気体の供給先で圧縮気体の需要が少ないときもしくは無いとき、前記水分離回収器や水循環流路等の水系統が凍結して破損等の不具合を生じることがある。   The water used in the water-lubricated compressor is separated and recovered by a water separation and recovery device corresponding to the oil separation and recovery device provided in the discharge flow path, as in the normal oil-cooled compressor described above. In this case, the compressor is supplied again through the water circulation channel. However, when there is little or no demand for compressed gas at the compressed gas supply destination in the winter season, the water system such as the water separation / recovery unit and the water circulation channel may freeze and cause problems such as breakage.

この様な水潤滑圧縮機の水系統の従来例に係る凍結防止技術につき、以下添付図６を参照しながら説明する。図６は従来例に係る凍結防止装置を備えた水噴射圧縮機の正面透視図である。この従来例に係る水噴射圧縮機の凍結防止方法は、パッケージ２０に２つの開口を形成すると共に、この開口を被覆するカバー４６をパッケージの外壁に取り付ける等して、このパッケージ２０内の空気を導入する導入口４４と、前記パッケージ２０内に加熱された空気を放出する放出口４５を備えた循環通路４７を形成し、この循環通路４７内に循環ファン等の空気循環手段４２及び伝熱ヒータ等の加熱手段４３を設けて、加熱された空気をパッケージ内に循環させるものである（特許文献１参照）。
特開２００１−２６３２４２号公報 The antifreezing technique according to the conventional example of the water system of such a water-lubricated compressor will be described below with reference to FIG. FIG. 6 is a front perspective view of a water injection compressor provided with a freeze prevention device according to a conventional example. The antifreezing method for the water jet compressor according to this conventional example forms two openings in the package 20 and attaches a cover 46 covering the opening to the outer wall of the package, for example, to reduce the air in the package 20. A circulation passage 47 having an introduction port 44 for introduction and a discharge port 45 for discharging heated air into the package 20 is formed. In the circulation passage 47, an air circulation means 42 such as a circulation fan and a heat transfer heater. A heating means 43 such as the above is provided to circulate the heated air in the package (see Patent Document 1).
JP 2001-263242 A

上記従来例に係る凍結防止技術は、パッケージ内の空気をファン等の空気循環手段により循環させることが必要である。しかしながら、前記パッケージ内には多数の構成部品が複雑に収容されており、パッケージ内の空気を淀みなく十分に循環させることは困難である。従って、この様な凍結防止方法では、全ての水系統の凍結防止が難しく、局部的な凍結発生の可能性がある。   The antifreezing technology according to the conventional example requires that the air in the package be circulated by an air circulation means such as a fan. However, a large number of components are housed in a complicated manner in the package, and it is difficult to circulate the air in the package sufficiently without stagnation. Therefore, with such a freeze prevention method, it is difficult to prevent freezing of all water systems, and local freezing may occur.

従って、本発明の目的は、電熱ヒータやファンを用いることなく、圧縮気体の供給先で圧縮気体の需要が少ないときもしくは無いときに、前記圧縮機の水系統から水を抜き取り、確実に凍結防止可能な水潤滑圧縮機の水抜き方法を提供することにある。   Therefore, the object of the present invention is to reliably remove the water from the water system of the compressor when there is little or no demand for the compressed gas at the supply destination of the compressed gas without using an electric heater or fan. It is an object of the present invention to provide a method for draining a water-lubricated compressor.

前記目的を達成するために、本発明の請求項１に係る水潤滑圧縮機の水抜き方法が採用した手段は、圧縮機本体と、この圧縮機本体の吐出流路に介設された水分離回収器と、この水分離回収器により分離された水を前記圧縮機本体の水供給箇所に供給するための水循環流路と、この水循環流路に介設された水クーラとを有する水潤滑圧縮機の水抜き方法において、前記水クーラと圧縮機本体の水供給箇所との間の水循環流路から分岐する循環水排水流路を設け、この循環水排水流路に第１排水開閉弁を介設し、圧縮機本体の停止時には前記第１排水開閉弁を開弁して排水することを特徴とするものである。   In order to achieve the above object, the means adopted by the water-lubricated compressor draining method according to claim 1 of the present invention includes a compressor main body and water separation interposed in the discharge passage of the compressor main body. Water-lubricated compression having a recovery device, a water circulation channel for supplying water separated by the water separation and recovery device to a water supply location of the compressor body, and a water cooler interposed in the water circulation channel In the water draining method of the machine, a circulating water drainage channel branched from a water circulation channel between the water cooler and the water supply point of the compressor body is provided, and a first drainage opening / closing valve is provided in the circulating water drainage channel. And when the compressor main body is stopped, the first drainage on-off valve is opened to drain water.

本発明の請求項２に係る水潤滑圧縮機の水抜き方法が採用した手段は、請求項１に記載の水潤滑圧縮機の水抜き方法において、前記水分離回収器に後続する吐出流路に吐出閉止手段を介設し、この吐出閉止手段が、圧縮機本体の停止時には前記吐出流路を閉止する開閉弁、または前記吐出流路の吐出方向にのみ圧縮気体が流れる様に開弁され、かつ保圧機能を有する保圧逆止弁であることを特徴とするものである。   The means adopted by the water draining method of the water-lubricated compressor according to claim 2 of the present invention is the water draining method of the water-lubricated compressor according to claim 1, wherein the water drainage compressor has a discharge channel that follows the water separation and recovery unit. A discharge closing means is interposed, and this discharge closing means is opened so that the compressed gas flows only in the discharge direction of the discharge flow path, or an on-off valve that closes the discharge flow path when the compressor body is stopped, The pressure holding check valve has a pressure holding function.

本発明の請求項３に係る水潤滑圧縮機の水抜き方法が採用した手段は、請求項１または２に記載の水潤滑圧縮機の水抜き方法において、前記圧縮機本体の吸込流路に吸込閉止手段を介設し、この吸込閉止手段が、圧縮機本体の停止時には前記吸込流路を閉止する開閉弁、または前記吸込流路の吸込方向にのみ気体が流れる様に開弁される逆止弁であることを特徴とするものである。   According to a third aspect of the present invention, the means employed in the water drainage method for the water-lubricated compressor is the water drainage method for the water-lubricated compressor according to the first or second aspect, wherein the suction is performed in the suction passage of the compressor body. A closing means is provided, and this suction closing means is an on-off valve that closes the suction flow path when the compressor body is stopped, or a check that is opened so that gas flows only in the suction direction of the suction flow path. It is characterized by being a valve.

本発明の請求項４に係る水潤滑圧縮機の水抜き方法が採用した手段は、請求項１乃至３のうちの何れか一つの項に記載の水潤滑圧縮機の水抜き方法において、前記圧縮機本体の吐出口から前記水分離回収器までの吐出流路に吐出開閉弁を介設し、前記圧縮機本体の停止時には前記吐出開閉弁を閉弁することを特徴とするものである。   The means adopted by the water draining method for a water-lubricated compressor according to claim 4 of the present invention is the water draining method for a water-lubricated compressor according to any one of claims 1 to 3, wherein the compression is performed. A discharge opening / closing valve is provided in a discharge flow path from the discharge port of the machine main body to the water separation / recovery unit, and the discharge opening / closing valve is closed when the compressor main body is stopped.

本発明の請求項５に係る水潤滑圧縮機の水抜き方法が採用した手段は、請求項１乃至４のうちの何れか一つの項に記載の水潤滑圧縮機の水抜き方法において、前記循環水排出流路の分岐箇所から圧縮機本体への水供給箇所までの水循環流路に水循環開閉弁を介設し、前記圧縮機本体の停止時には前記水循環開閉弁を閉弁することを特徴とするものである。   The means adopted by the water draining method for a water-lubricated compressor according to claim 5 of the present invention is the water draining method for a water-lubricated compressor according to any one of claims 1 to 4, wherein the circulation is performed. A water circulation on / off valve is interposed in a water circulation channel from a branch point of the water discharge channel to a water supply point to the compressor body, and the water circulation on / off valve is closed when the compressor body is stopped. Is.

本発明の請求項６に係る水潤滑圧縮機の水抜き方法が採用した手段は、請求項１乃至５のうちの何れか一つの項に記載の水潤滑圧縮機の水抜き方法において、前記水分離回収器と水クーラとの間の水循環流路から分岐する回収水排水流路を設け、この回収水排水流路に第２排水開閉弁を介設すると共に、前記圧縮機本体の停止時には前記第２排水開閉弁を開弁して排水することを特徴とするものである。   The means adopted by the water draining method for a water-lubricated compressor according to claim 6 of the present invention is the water draining method for a water-lubricated compressor according to any one of claims 1 to 5, wherein the water A recovered water drainage channel branched from a water circulation channel between the separator / collector and the water cooler is provided, and a second drainage opening / closing valve is provided in the recovered water drainage channel, and when the compressor body is stopped, The second drainage opening / closing valve is opened to drain water.

本発明の請求項７に係る水潤滑圧縮機の水抜き方法が採用した手段は、請求項１乃至６のうちの何れか一つの項に記載の水潤滑圧縮機の水抜き方法において、前記水分離回収器の気相部と前記水分離回収器から水クーラまでの間の水循環流路とを連通し、前記水分離回収器内の水面より高所に配置した送気流路を設け、この送気流路に送気開閉弁を介設すると共に、前記圧縮機本体の停止時には前記送気開閉弁を開弁することを特徴とするものである。   The means adopted by the water draining method for a water-lubricated compressor according to claim 7 of the present invention is the water draining method for a water-lubricated compressor according to any one of claims 1 to 6, wherein the water An air supply passage arranged at a higher position than the water surface in the water separation / recovery unit is provided to communicate the gas phase portion of the separation / recovery unit with the water circulation passage between the water separation / recovery unit and the water cooler. An air supply opening / closing valve is interposed in the air flow path, and the air supply opening / closing valve is opened when the compressor main body is stopped.

本発明の請求項１に係る水潤滑圧縮機の水抜き方法によれば、圧縮機本体と、この圧縮機本体の吐出流路に介設された水分離回収器と、この水分離回収器により分離された水を前記圧縮機本体の水供給箇所に供給するための水循環流路と、この水循環流路に介設された水クーラとを有する水潤滑圧縮機の水抜き方法において、前記水クーラと圧縮機本体の水供給箇所との間の水循環流路から分岐する循環水排水流路を設け、この循環水排水流路に第１排水開閉弁を介設し、圧縮機本体の停止時には前記第１排水開閉弁を開弁して排水するので、前記水循環流路に介設された機器のうち、特に水の凍結の影響を受け易い水クーラから水を抜くことが出来、凍結による水クーラの破損等の不具合を回避することが出来る。   According to the water draining method of the water-lubricated compressor according to claim 1 of the present invention, the compressor main body, the water separation / recovery device interposed in the discharge flow path of the compressor main body, and the water separation / recovery device In the water drainage method for a water-lubricated compressor, comprising the water circulation channel for supplying the separated water to the water supply location of the compressor body and the water cooler interposed in the water circulation channel, the water cooler A circulating water drainage channel branched from the water circulation channel between the water supply location of the compressor main body and a first drainage opening / closing valve is provided in the circulating water drainage channel, and when the compressor main body is stopped, Since the first drain on / off valve is opened and drained, water can be extracted from a water cooler that is particularly susceptible to freezing of water among the devices provided in the water circulation channel, and the water cooler due to freezing. It is possible to avoid problems such as damage.

また、本発明の請求項２に係る水潤滑圧縮機の水抜き方法によれば、前記水分離回収器に後続する吐出流路に吐出閉止手段を介設し、この吐出閉止手段が、圧縮機本体の停止時には前記吐出流路を閉止する開閉弁、または前記吐出流路の吐出方向にのみ圧縮気体が流れる様に開弁され、かつ保圧機能を有する保圧逆止弁であるので、前記水分離回収器、水クーラ及び水循環流路からなる水系統の内部圧力を、前記第１排水開閉弁を介して排水可能な圧力に保持することが出来る。   Further, according to the water draining method of the water-lubricated compressor according to claim 2 of the present invention, the discharge closing means is provided in the discharge flow path following the water separation and recovery device, and the discharge closing means is a compressor. An on-off valve that closes the discharge passage when the main body is stopped, or a pressure-holding check valve that is opened so that compressed gas flows only in the discharge direction of the discharge passage and has a pressure-holding function. The internal pressure of the water system comprising the water separator / recovery unit, the water cooler, and the water circulation channel can be maintained at a pressure that allows drainage via the first drain on / off valve.

更に、本発明の請求項３に係る水潤滑圧縮機の水抜き方法によれば、前記圧縮機本体の吸込流路に吸込閉止手段を介設し、この吸込閉止手段が、圧縮機本体の停止時には前記吸込流路を閉止する開閉弁、または前記吸込流路の吸込方向にのみ気体が流れる様に開弁される逆止弁であるので、前記水系統の内部圧力を、前記第１排水開閉弁を介して排水可能な圧力に保持し、前記第１排水開閉弁による排水を円滑になすことが出来る。   Further, according to the water draining method of the water-lubricated compressor according to claim 3 of the present invention, the suction closing means is interposed in the suction flow path of the compressor main body, and this suction closing means is used to stop the compressor main body. Sometimes it is an on-off valve that closes the suction flow path, or a check valve that is opened so that gas flows only in the suction direction of the suction flow path. The pressure can be drained through the valve, and the drainage by the first drain on / off valve can be smoothly performed.

本発明の請求項４に係る水潤滑圧縮機の水抜き方法によれば、前記圧縮機本体の吐出口から前記水分離回収器までの吐出流路に吐出開閉弁を介設し、前記圧縮機本体の停止時には前記吐出開閉弁を閉弁するので、吐出流路からの圧縮気体の漏洩を防止し、前記水系統における内部圧力の低下を抑制して、前記第１排水開閉弁による排水を円滑になすことが出来る。   According to a water draining method for a water-lubricated compressor according to claim 4 of the present invention, a discharge on-off valve is provided in a discharge flow path from a discharge port of the compressor body to the water separation and recovery unit, and the compressor Since the discharge on / off valve is closed when the main body is stopped, leakage of compressed gas from the discharge flow path is prevented, a decrease in internal pressure in the water system is suppressed, and drainage by the first drain on / off valve is smoothly performed. Can be made.

また、本発明の請求項５に係る水潤滑圧縮機の水抜き方法によれば、前記循環水排出流路の分岐箇所から圧縮機本体への水供給箇所までの水循環流路に水循環開閉弁を介設し、前記圧縮機本体の停止時には前記水循環開閉弁を閉弁するので、圧縮機本体が停止した際の圧縮機本体への不必要な水の供給を防止する。   According to the water draining method of the water-lubricated compressor according to claim 5 of the present invention, the water circulation on / off valve is provided in the water circulation channel from the branching point of the circulating water discharge channel to the water supply point to the compressor body. Since the water circulation on-off valve is closed when the compressor body is stopped, unnecessary water supply to the compressor body when the compressor body is stopped is prevented.

更に、本発明の請求項６に係る水潤滑圧縮機の水抜き方法によれば、前記水分離回収器と水クーラとの間の水循環流路から分岐する回収水排水流路を設け、この回収水排水流路に第２排水開閉弁を介設すると共に、前記圧縮機本体の停止時には前記第２排水開閉弁を開弁して排水するので、前記水分離回収器内の水とこの水に混入しているごみ成分を円滑に排出すると共に、前記第１排水開閉弁を開弁した際形成される水分離回収器から水クーラへの水流によって水クーラ内のごみ成分を押し出し、内部の細管等の閉塞を防止する。   Furthermore, according to the water draining method of the water-lubricated compressor according to claim 6 of the present invention, a recovered water drainage channel branched from the water circulation channel between the water separation and recovery unit and the water cooler is provided, and this recovery is performed. A second drainage opening / closing valve is interposed in the water drainage flow path, and when the compressor main body is stopped, the second drainage opening / closing valve is opened to drain water. The waste components contained in the water cooler are smoothly discharged by the water flow from the water separator / collector formed when the first drain on / off valve is opened to the water cooler. Prevent blockage.

本発明の請求項７に係る水潤滑圧縮機の水抜き方法によれば、前記水分離回収器の気相部と前記水分離回収器から水クーラまでの間の水循環流路とを連通し、前記水分離回収器内の水面より高所に配置した送気流路を設け、この送気流路に送気開閉弁を介設すると共に、前記圧縮機本体の停止時には前記送気開閉弁を開弁するので、水分離回収器内の圧縮機体によって直接水クーラ内の水を押し出し、前記水クーラ内の排水を円滑になすことが出来る。   According to the water draining method of the water-lubricated compressor according to claim 7 of the present invention, the gas phase portion of the water separation and recovery unit and the water circulation channel between the water separation and recovery unit and the water cooler are communicated, An air supply passage disposed above the water surface in the water separation and recovery device is provided, and an air supply opening / closing valve is provided in the air supply passage, and the air supply opening / closing valve is opened when the compressor body is stopped. Therefore, the water in the water cooler can be directly pushed out by the compressor body in the water separation and recovery unit, and the water in the water cooler can be smoothly drained.

次に、本発明の実施の形態１に係る水潤滑圧縮機の水抜き方法について、添付図１を参照しながら説明する。図１は、本発明の実施の形態１に係る水潤滑圧縮機の水抜き方法を説明するための模式的系統図である。   Next, a water draining method for the water-lubricated compressor according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic system diagram for explaining a water draining method for a water-lubricated compressor according to Embodiment 1 of the present invention.

本発明の実施の形態１に係る水潤滑圧縮機は、図示しない雌雄一対のスクリュロータが噛み合って、ロータケーシングの内部に形成されたロータ室に回転可能に収容されてなる圧縮機本体1を備えている。圧縮機本体１の吸込口１ａには吸込流路２が接続される一方、その吐出口１ｂには吐出流路３の一端側が接続されている。そして、圧縮機本体１を構成する前記雌雄一対のスクリュロータのうちの一方、雄ロータのみが、駆動モータＭの駆動軸に接続されている。この駆動モータＭにより、前記スクリュロータを回転させることによって、吸込流路２から供給される気体を、圧縮機本体１の吸込口１ａから吸い込み、圧縮して吐出口１ｂから高圧気体として吐出流路３に吐出する。   A water-lubricated compressor according to Embodiment 1 of the present invention includes a compressor main body 1 that is engaged with a pair of male and female screw rotors (not shown) and rotatably accommodated in a rotor chamber formed inside a rotor casing. ing. A suction flow path 2 is connected to the suction port 1a of the compressor body 1, while one end side of the discharge flow path 3 is connected to the discharge port 1b. Only one male rotor of the pair of male and female screw rotors constituting the compressor body 1 is connected to the drive shaft of the drive motor M. By rotating the screw rotor by this drive motor M, the gas supplied from the suction channel 2 is sucked from the suction port 1a of the compressor body 1 and compressed to be discharged from the discharge port 1b as high-pressure gas. 3 is discharged.

また、前記吐出流路３には、吐出された圧縮気体から水を分離回収する水分離回収器４が介設されている。この水分離回収器４内部には、図示しない水分離エレメントが備えられており、流入した高圧気体に混入している水を前記水分離エレメントにて捕捉する。水分離エレメントにて捕捉された水は自重により滴下し、水分離回収器４内部の下方に水溜り部４ａが形成される。   The discharge flow path 3 is provided with a water separation / recovery unit 4 for separating and recovering water from the discharged compressed gas. A water separation element (not shown) is provided inside the water separation / recovery unit 4, and water mixed in the inflowing high-pressure gas is captured by the water separation element. The water captured by the water separation element is dropped by its own weight, and a water reservoir 4a is formed below the inside of the water separation / recovery device 4.

そして、この水分離回収器４の水溜り部４ａに溜められた水を、圧縮機本体１の水供給箇所（スクリュロータとそれらを収容するロータケーシングで形成された圧縮空間や軸受等）１ｃに供給するための水循環流路５が設けられている。前記水循環流路５には、圧縮機本体１に供給するための水を冷却する水クーラ６とフィルター７とが介設されている。   Then, the water stored in the water reservoir 4a of the water separator / collector 4 is supplied to a water supply location (compression space or bearing formed by a screw rotor and a rotor casing for accommodating them) 1c of the compressor body 1. A water circulation channel 5 for supply is provided. The water circulation channel 5 is provided with a water cooler 6 and a filter 7 for cooling water to be supplied to the compressor body 1.

また、前記水分離回収器４に後続する圧縮気体の吐出流路３には、吐出閉止手段８が介設されると共に圧力計３ａが設けられている。更に、前記水クーラ６と圧縮機本体１の水供給箇所１ｃとの間の水循環流路５には、この水循環流路５から分岐する循環水排水流路５ａが設けられ、この循環水排水流路５ａには第１排水開閉弁５ｂが介設されている。   The compressed gas discharge passage 3 subsequent to the water separation / recovery unit 4 is provided with a discharge closing means 8 and a pressure gauge 3a. Further, the water circulation passage 5 between the water cooler 6 and the water supply location 1c of the compressor body 1 is provided with a circulation water drain passage 5a branched from the water circulation passage 5. A first drain on / off valve 5b is interposed in the path 5a.

一方、圧縮機本体１の駆動モータＭは、制御器１０からインバータ１１を介して伝達される周波数信号によって回転制御される。即ち、前記制御器１０は、通常の運転中には、吐出流路３に設けられた前記圧力計３ａの検出圧力Ｐｄを受信し、この検出圧力Ｐｄが予め定められた所定圧になる様に、ＰＩＤ制御等によって算出された適正な回転数をインバータ１１に指令し回転制御する。   On the other hand, the drive motor M of the compressor body 1 is rotationally controlled by a frequency signal transmitted from the controller 10 via the inverter 11. That is, the controller 10 receives the detected pressure Pd of the pressure gauge 3a provided in the discharge flow path 3 during normal operation, and the detected pressure Pd becomes a predetermined pressure. Then, the inverter 11 is instructed to control an appropriate rotation speed calculated by PID control or the like.

また、前記制御器１０は、圧縮機本体１の運転時には前記第１排水開閉弁５ｂを閉弁する。同時に、前記吐出閉止手段８は開弁されて吐出流路３が連通される。一方、圧縮機本体１の停止時には、前記第１排水開閉弁５ｂを開弁して水循環流路５内の水を排出する。同時に、前記吐出閉止手段８は閉弁されて吐出流路３が閉止される。前記吐出閉止手段８としては、開閉弁または前記吐出流路３の吐出方向にのみ圧縮気体が流れる様に開弁され、かつ、後述する理由から保圧機能を有する保圧逆止弁を用いるのが好ましい。   Further, the controller 10 closes the first drain on / off valve 5b when the compressor body 1 is in operation. At the same time, the discharge closing means 8 is opened and the discharge flow path 3 is communicated. On the other hand, when the compressor body 1 is stopped, the first drain on / off valve 5b is opened to discharge water in the water circulation passage 5. At the same time, the discharge closing means 8 is closed and the discharge flow path 3 is closed. As the discharge closing means 8, an on-off valve or a pressure-holding check valve that is opened so that compressed gas flows only in the discharge direction of the discharge flow path 3 and has a pressure-holding function for the reason described later is used. Is preferred.

即ち、前記制御器１０は、図示しない入力手段（起動・停止スイッチが備えられた入力パネル等）からの起動信号を受信して、前記吐出閉止手段８が開閉弁の場合はこれを開弁して吐出流路３を連通させると共に、前記第１排水開閉弁５ｂを閉弁し、次いで圧縮機本体１の運転を開始させる。   That is, the controller 10 receives an activation signal from an input means (not shown) such as an input panel provided with a start / stop switch, and opens the discharge closing means 8 if it is an on-off valve. Thus, the discharge flow path 3 is communicated, the first drainage on-off valve 5b is closed, and then the operation of the compressor body 1 is started.

一方、圧縮気体の供給先で圧縮気体の需要が少ないときもしくは無いときは、この水潤滑圧縮機の操作者がそれを判断して、図示しない入力手段の停止スイッチを押す。前記制御器１０は、この運転停止信号を受信して圧縮機本体１の運転を停止させる。次いで、前記吐出閉止手段８が開閉弁の場合はこれを閉弁して吐出流路３を閉止させると共に、前記第１排水開閉弁５ｂを開弁し、水循環流路５や水クーラ６内の水を排出する。   On the other hand, when there is little or no demand for compressed gas at the compressed gas supply destination, the operator of this water-lubricated compressor judges it and pushes a stop switch of input means (not shown). The controller 10 receives the operation stop signal and stops the operation of the compressor body 1. Next, when the discharge closing means 8 is an on-off valve, the discharge closing means 8 is closed to close the discharge flow path 3, and the first drainage open / close valve 5b is opened to open the water circulation flow path 5 or the water cooler 6 inside. Drain the water.

あるいは、前記制御器１０が、吐出流路３に設けられた前記圧力計３ａの検出圧力Ｐｄを受信し、この検出圧力Ｐｄが予め設定された上限圧と下限圧の間に維持される様に、圧縮機本体１の停止または起動を指令し、この指令に伴って上述の如く、前記吐出閉止手段８と第１排水開閉弁５ｂとが開閉される様に構成されても良い。   Alternatively, the controller 10 receives the detected pressure Pd of the pressure gauge 3a provided in the discharge flow path 3, and the detected pressure Pd is maintained between a preset upper limit pressure and lower limit pressure. The compressor main body 1 may be instructed to stop or start, and the discharge closing means 8 and the first drainage opening / closing valve 5b may be opened / closed in accordance with the instruction as described above.

上記の様な構成をなすことによって、圧縮機本体１が停止された直後における水分離回収器４及び水循環流路５内の圧力は、停止直前の高圧に保持されている。そして、前記第１排水開閉弁５ｂの開弁と共に、前記水循環流路５内の圧力の作用によって、水循環流路５内部、特に水クーラ６内部に存在する水が押し出され、前記第１排水開閉弁５ｂを介してこの水潤滑圧縮機の系外に排出される。   By configuring as described above, the pressure in the water separation / recovery unit 4 and the water circulation channel 5 immediately after the compressor body 1 is stopped is maintained at a high pressure immediately before the stop. Then, together with the opening of the first drainage on / off valve 5b, the water in the water circulation channel 5, particularly the water cooler 6, is pushed out by the action of the pressure in the water circulation channel 5, and the first drain on / off valve is opened. It is discharged out of the system of this water-lubricated compressor through the valve 5b.

尚、水循環流路５等の水系統の中でも最も多量に水が保留され得るのは水分離回収器４であるが、通常の環境下では、この水分離回収器４の水溜り部４ａに溜まった水までを全量抜き取る必要はなく、肉厚の薄い（０．５ｍｍ程度の）銅チューブによって構成されている水クーラ６内の水のみの抜き取りでも凍結による破損回避上十分である。   The water separation / recovery unit 4 can hold the largest amount of water in the water system such as the water circulation flow path 5. However, the water separation / recovery unit 4 of the water separation / recovery unit 4 collects water in a normal environment. It is not necessary to extract the entire amount of water, and extraction of only the water in the water cooler 6 constituted by a thin (about 0.5 mm) copper tube is sufficient to avoid breakage due to freezing.

圧縮機本体１が停止されて以降、吐出閉止手段８が保圧逆止弁等の場合には、その吐出閉止手段８を介して圧縮気体が系外へ漏出する。また、第１排水開閉弁５ｂを介して水循環流路５等の水系統から水が排出される。従って、前記圧力計３ａの検出圧力Ｐｄは徐々に低下する。そして、この検出圧力Ｐｄが所定の圧力、例えば０．２ＭＰａに達したら、前記第１排水開閉弁５ｂを閉弁する。尚、前記第１排水開閉弁５ｂは、次の圧縮機本体１の起動まで開弁したままの状態とし、圧縮機本体１の起動と共に閉弁するよう構成しても良い。   After the compressor main body 1 is stopped, when the discharge closing means 8 is a holding pressure check valve or the like, the compressed gas leaks out of the system through the discharge closing means 8. In addition, water is discharged from the water system such as the water circulation channel 5 through the first drain opening / closing valve 5b. Accordingly, the detected pressure Pd of the pressure gauge 3a gradually decreases. When the detected pressure Pd reaches a predetermined pressure, for example, 0.2 MPa, the first drain on / off valve 5b is closed. The first drain on / off valve 5b may remain open until the next start of the compressor body 1 and closes with the start of the compressor body 1.

ところで、前記水系統中に存在する水量が比較的少ない時は問題ないが、比較的水量が多い場合には、前記第１排水開閉弁５ｂが閉弁されるまでに、水循環流路５や水クーラ６内の水が抜け切らない場合がある。前記吐出閉止手段８を逆止弁とする場合、保圧機能を有する保圧逆止弁が好ましい理由はこのためである。   By the way, there is no problem when the amount of water present in the water system is relatively small. However, when the amount of water is relatively large, the water circulation channel 5 and the water are not collected until the first drainage opening / closing valve 5b is closed. In some cases, the water in the cooler 6 may not drain. For this reason, when the discharge closing means 8 is a check valve, a pressure holding check valve having a pressure holding function is preferable.

例えば、前記第１排水開閉弁５ｂを０．５ＭＰａ以上とならない限り開弁しない保圧逆止弁とすることにより、前記水分離回収器４内の圧力が０．５ＭＰａ未満に低下しても、前記吐出閉止手段５ｂから系外の空気が逆流しないばかりか、水分離回収器４や水クーラ６等を含む水循環流路５内の圧力を、前記第１排水開閉弁５ｂを介して水抜き可能な圧力以上に保持することが出来る。この様な構成をなすことによって、水循環流路５に介設された機器のうち、特に水の凍結による影響を受け易い水クーラ６から確実に水を抜き取ることが出来、水の凍結による破損等の不具合発生を回避出来るのである。   For example, even if the pressure in the water separation / recovery unit 4 is reduced to less than 0.5 MPa by setting the first drainage opening / closing valve 5b to be a pressure-retaining check valve that does not open unless the pressure is 0.5 MPa or more, Not only air outside the system does not flow backward from the discharge closing means 5b, but also the pressure in the water circulation passage 5 including the water separator / collector 4 and the water cooler 6 can be drained via the first drain on / off valve 5b. The pressure can be maintained above a certain level. With such a configuration, water can be surely extracted from the water cooler 6 that is particularly susceptible to freezing of water among the devices interposed in the water circulation flow path 5, and damage due to freezing of water, etc. It is possible to avoid the occurrence of problems.

更に、本発明の実施の形態１に係る水潤滑圧縮機には、前記圧縮機本体１の吸込流路２に吸込閉止手段９が介設され、圧縮機本体１の停止時には、前記吸込閉止手段９によって前記吸込流路２が閉止される様に構成されている。前記吸込閉止手段９としては、開閉弁または前記吸込流路２の吸込方向にのみ気体が流れる様に開弁される逆止弁であるのが好ましい。   Furthermore, in the water-lubricated compressor according to Embodiment 1 of the present invention, the suction closing means 9 is interposed in the suction flow path 2 of the compressor main body 1, and when the compressor main body 1 is stopped, the suction closing means 9 9, the suction channel 2 is closed. The suction closing means 9 is preferably an on-off valve or a check valve that is opened so that gas flows only in the suction direction of the suction flow path 2.

前記吸込閉止手段９を必ずしも設ける必要はない。但し、吸込流路２に前記吸込閉止手段９がない場合、圧縮機本体１が停止されると、圧縮機本体１内部の圧縮気体がスクリュロータの歯溝間のわずかな間隙、更には吸込流路２を通過して系外へ漏出し、水循環流路５内の圧力が徐々に低下することになる。従って、前記吸込閉止手段９を設けるのがより好ましい。吸込流路２に前記吸込閉止手段９を設けることにより、前記吸込流路２からの圧縮気体の漏出を防止し、水循環流路５内の圧力低下を遅らせて、前記第１排水開閉弁５ｂによる水抜きを円滑になすことが出来る。   The suction closing means 9 is not necessarily provided. However, when the suction closing means 9 is not provided in the suction flow path 2, when the compressor main body 1 is stopped, the compressed gas inside the compressor main body 1 causes a slight gap between the tooth grooves of the screw rotor, and further the suction flow. It leaks out of the system through the path 2, and the pressure in the water circulation path 5 gradually decreases. Therefore, it is more preferable to provide the suction closing means 9. By providing the suction closing means 9 in the suction flow path 2, the leakage of compressed gas from the suction flow path 2 is prevented, the pressure drop in the water circulation flow path 5 is delayed, and the first drain on / off valve 5b Water can be drained smoothly.

以上の通り、本発明の実施の形態１に係る水潤滑圧縮機の水抜き方法によれば、水クーラ６と圧縮機本体１の水供給箇所１ｃとの間の水循環流路５から分岐する循環水排水流路５ａを設け、この循環水排水流路５ａに第１排水開閉弁５ｂを介設し、圧縮機本体１の停止時には前記第１排水開閉弁５ｂを開弁して排水するので、前記水循環流路５に介設された機器のうち、特に水の凍結の影響を受け易い水クーラ６から水を抜くことが出来、凍結による水クーラ６の破損等の不具合を回避することが出来る。   As described above, according to the water draining method for a water-lubricated compressor according to Embodiment 1 of the present invention, the circulation branched from the water circulation channel 5 between the water cooler 6 and the water supply location 1c of the compressor body 1. A water drainage channel 5a is provided, and a first drainage on / off valve 5b is interposed in the circulating water drainage channel 5a. When the compressor body 1 is stopped, the first drainage on / off valve 5b is opened to drain water. Of the devices provided in the water circulation channel 5, water can be extracted from the water cooler 6 that is particularly susceptible to water freezing, and problems such as breakage of the water cooler 6 due to freezing can be avoided. .

また、水分離回収器４に後続する吐出流路３に吐出閉止手段８を介設し、前記吐出閉止手段８が、圧縮機本体１の停止時には前記吐出流路３を閉止する開閉弁、または前記吐出流路３の吐出方向にのみ圧縮気体が流れる様に開弁され、かつ保圧機能を有する保圧逆止弁であるので、前記水分離回収器４、水クーラ６、フィルター７及び水循環流路５からなる水系統の内部圧力を、前記第１排水開閉弁５ｂを介して排水可能な圧力に保持することが出来る。ひいては、水クーラ６からの水抜きの確実性をより向上させることが出来る。   Also, a discharge closing means 8 is provided in the discharge flow path 3 following the water separator / collector 4, and the discharge closing means 8 closes the discharge flow path 3 when the compressor body 1 is stopped, or Since it is a pressure-holding check valve that is opened so that compressed gas flows only in the discharge direction of the discharge flow path 3 and has a pressure-holding function, the water separation and recovery unit 4, the water cooler 6, the filter 7, and the water circulation The internal pressure of the water system composed of the flow path 5 can be maintained at a pressure that allows drainage through the first drain opening / closing valve 5b. As a result, the certainty of draining from the water cooler 6 can be further improved.

更に、前記圧縮機本体１の吸込流路２に吸込閉止手段９を介設し、この吸込閉止手段９が、圧縮機本体１の停止時には前記吸込閉止手段９によって前記吸込流路２を閉止する開閉弁、または前記吸込流路２の吸込方向にのみ気体が流れる様に開弁される逆止弁であるので、前記水系統の圧力を、前記第１排水開閉弁５ｂを介して排水可能な圧力に保持するし、前記第１排水開閉弁５ｂによる排水を円滑になすことが出来る。   Further, a suction closing means 9 is provided in the suction flow path 2 of the compressor main body 1, and the suction closing means 9 closes the suction flow path 2 by the suction closing means 9 when the compressor main body 1 is stopped. Since it is a check valve that is opened so that gas flows only in the suction direction of the suction passage 2, the pressure of the water system can be drained via the first drain on / off valve 5 b. The pressure can be maintained, and drainage by the first drainage on-off valve 5b can be smoothly performed.

次に、本発明の実施の形態２に係る水潤滑圧縮機の水抜き方法につき、以下添付図２を参照しながら説明する。図２は本発明の実施の形態２に係る水潤滑圧縮機の水抜き方法を説明するための模式的系統図である。尚、本発明の実施の形態２が上記実施の形態１と相違するところは、吐出流路ひいては水循環流路における保圧構成に相違があり、その他は全く同構成であるから、前記吐出流路及び水循環流路における保圧構成についての説明に止めるものとする。   Next, a water draining method for a water-lubricated compressor according to Embodiment 2 of the present invention will be described below with reference to FIG. FIG. 2 is a schematic system diagram for explaining a water draining method for a water-lubricated compressor according to Embodiment 2 of the present invention. The second embodiment of the present invention differs from the first embodiment in that there is a difference in the pressure holding configuration in the discharge flow channel and thus in the water circulation flow channel, and the others are completely the same. Also, the description of the pressure holding configuration in the water circulation channel will be stopped.

本発明の実施の形態１においては、圧縮機本体１の停止時における前記吐出流路３及び水循環流路５の内部圧は、吐出閉止手段８と圧縮機本体１（及び吸込閉止手段９）とによって保持される構成とした。これに対し、本発明の実施の形態２においては、吐出流路３及び水循環流路５における前記内部圧は、前記吐出閉止手段８と圧縮機本体１の吐出口１ｂから水分離回収器４までの吐出流路３に介設された吐出開閉弁１２とによって保持される。そして、前記制御器１０は、圧縮機本体１の停止時には、吐出開閉弁１２を、更に前記吐出閉止手段８が開閉弁の場合には、その吐出閉止手段８も閉弁する様に構成されている。   In Embodiment 1 of the present invention, when the compressor main body 1 is stopped, the internal pressures of the discharge flow path 3 and the water circulation flow path 5 are the discharge closing means 8 and the compressor main body 1 (and the suction closing means 9). It was set as the structure hold | maintained by. On the other hand, in Embodiment 2 of the present invention, the internal pressure in the discharge flow path 3 and the water circulation flow path 5 is from the discharge closing means 8 and the discharge port 1b of the compressor body 1 to the water separation / recovery device 4. Is held by a discharge on-off valve 12 interposed in the discharge flow path 3. The controller 10 is configured to close the discharge on-off valve 12 when the compressor body 1 is stopped, and further close the discharge closing means 8 when the discharge closing means 8 is an on-off valve. Yes.

即ち、吐出流路３に前記吐出開閉弁１２がない場合、圧縮機本体１が停止すると、圧縮機本体１内部の圧縮気体がスクリュロータの歯溝間のわずかな間隙、更には吸込流路２を通過して系外へ漏出する結果、水循環流路５内の圧力が徐々に低下することになる。前記圧縮機本体１の吐出口１ｂから前記水分離回収器４までの吐出流路２に前記吐出開閉弁１２を設けることにより、水分離回収器４→圧縮機本体１→吸込流路２の方向の圧縮気体の漏出を防止し、水循環流路５内の圧力低下を抑制して、前記第１排水開閉弁５ｂによる水抜きを円滑になすことが出来る。なお更に、前記水回収分離器４から圧縮機本体１への水の逆流も防止できる。   That is, when the discharge opening / closing valve 12 is not provided in the discharge flow path 3, when the compressor main body 1 is stopped, the compressed gas inside the compressor main body 1 becomes a slight gap between the tooth grooves of the screw rotor, and also the suction flow path 2. As a result of leaking out of the system through the pressure, the pressure in the water circulation channel 5 gradually decreases. By providing the discharge opening / closing valve 12 in the discharge passage 2 from the discharge port 1b of the compressor body 1 to the water separation / recovery device 4, the direction of the water separation / recovery device 4 → the compressor body 1 → the suction flow passage 2 is provided. The compressed gas can be prevented from leaking, the pressure drop in the water circulation channel 5 can be suppressed, and the water can be smoothly drained by the first drain opening / closing valve 5b. Still further, back flow of water from the water recovery separator 4 to the compressor body 1 can be prevented.

次に、本発明の実施の形態３に係る水潤滑圧縮機の水抜き方法につき、以下添付図３を参照しながら説明する。図３は本発明の実施の形態３に係る水潤滑圧縮機の水抜き方法を説明するための模式的系統図である。尚、本発明の実施の形態３が上記実施の形態１と相違するところは、吐出流路ひいては水循環流路における保圧構成に相違があり、その他は全く同構成であるから、前記吐出流路及び水循環流路における保圧構成についての説明に止めるものとする。   Next, a water draining method for a water-lubricated compressor according to Embodiment 3 of the present invention will be described below with reference to FIG. FIG. 3 is a schematic system diagram for explaining a water draining method for a water-lubricated compressor according to Embodiment 3 of the present invention. The third embodiment of the present invention differs from the first embodiment in that there is a difference in the pressure holding configuration in the discharge flow channel and thus in the water circulation flow channel, and the others are completely the same. Also, the description of the pressure holding configuration in the water circulation channel will be stopped.

本発明の実施の形態１においては、圧縮機本体１の停止時における前記吐出流路３及び水循環流路５の内部圧は、吐出閉止手段８と圧縮機本体１（及び吸込閉止手段９）とによって保持される構成とした。これに対し、本発明の実施の形態３においては、吐出流路３及び水循環流路５における前記内部圧は、前記吐出閉止手段８、吐出流路３に介設された前記吐出開閉弁１２及び前記循環水排出流路５ａの分岐箇所から圧縮機本体１への水供給箇所１ｃまでの水循環流路５に介設された水循環開閉弁１３によって保持される。   In Embodiment 1 of the present invention, when the compressor main body 1 is stopped, the internal pressures of the discharge flow path 3 and the water circulation flow path 5 are the discharge closing means 8 and the compressor main body 1 (and the suction closing means 9). It was set as the structure hold | maintained by. On the other hand, in Embodiment 3 of the present invention, the internal pressure in the discharge flow path 3 and the water circulation flow path 5 is the discharge closing means 8, the discharge on-off valve 12 interposed in the discharge flow path 3, and The circulating water discharge channel 5a is held by a water circulation on / off valve 13 provided in the water circulation channel 5 from the branch point to the water supply point 1c to the compressor body 1.

そして、前記制御器１０は、圧縮機本体１の停止時には、吐出開閉弁１２及び水循環開閉弁１３を、更には、前記吐出閉止手段８が開閉弁の場合にはその吐出開閉手段８も、閉弁する様に構成されている。この水循環開閉弁１３を水循環流路５に介設することによって、圧縮機本体１が停止時には、圧縮機本体１への不必要な水の供給を防止することが可能となる。   The controller 10 closes the discharge on / off valve 12 and the water circulation on / off valve 13 when the compressor main body 1 is stopped, and also the discharge on / off means 8 when the discharge closing means 8 is an on / off valve. It is configured to speak. By providing the water circulation on / off valve 13 in the water circulation flow path 5, it is possible to prevent unnecessary supply of water to the compressor body 1 when the compressor body 1 is stopped.

次に、本発明の実施の形態４に係る水潤滑圧縮機の水抜き方法につき、以下添付図４を参照しながら説明する。図４は本発明の実施の形態４に係る水潤滑圧縮機の水抜き方法を説明するための模式的系統図である。尚、本発明の実施の形態４が上記実施の形態１と相違するところは、吐出流路ひいては水循環流路における保圧構成、排水流路構成及び排水方法に相違があり、その他は全く同構成であるから、前記吐出流路及び水循環流路における保圧構成、排水流路構成及び排水方法についての説明に止めるものとする。   Next, a water draining method for a water-lubricated compressor according to Embodiment 4 of the present invention will be described below with reference to FIG. FIG. 4 is a schematic system diagram for explaining a water draining method for a water-lubricated compressor according to Embodiment 4 of the present invention. It should be noted that the fourth embodiment of the present invention differs from the first embodiment in that there are differences in the pressure holding configuration, drainage channel configuration, and drainage method in the discharge channel, and thus in the water circulation channel, and the rest is exactly the same in configuration. Therefore, the description of the pressure holding configuration, the drainage channel configuration, and the drainage method in the discharge channel and the water circulation channel is limited.

本発明の実施の形態１においては、圧縮機本体１の停止時における前記吐出流路３及び水循環流路５の内部圧は、吐出閉止手段８と圧縮機本体１（及び吸込閉止手段９）とによって保持されると共に、水系統からの排水は、循環水排水流路５ａに介設された第１排水開閉弁５ｂから排出される構成とした。これに対し、本発明の実施の形態４においては、吐出流路３及び水循環流路５における前記内部圧は、前記吐出閉止手段８、吐出流路３に介設された前記吐出開閉弁１２及び前記循環水排出流路５ａの分岐箇所から圧縮機本体１への水供給箇所１ｃまでの水循環流路５に介設された水循環開閉弁１３によって保持される。   In Embodiment 1 of the present invention, when the compressor main body 1 is stopped, the internal pressures of the discharge flow path 3 and the water circulation flow path 5 are the discharge closing means 8 and the compressor main body 1 (and the suction closing means 9). The drainage from the water system is discharged from the first drainage on / off valve 5b interposed in the circulating water drainage channel 5a. In contrast, in Embodiment 4 of the present invention, the internal pressure in the discharge flow path 3 and the water circulation flow path 5 is the discharge closing means 8, the discharge on-off valve 12 interposed in the discharge flow path 3, and The circulating water discharge channel 5a is held by a water circulation on / off valve 13 provided in the water circulation channel 5 from the branch point to the water supply point 1c to the compressor body 1.

一方、水系統からの排水は、前記循環水排水流路５ａに第１排水開閉弁５ｂが、水分離回収器４と水クーラ６との間の水循環流路５から分岐された回収水排水流路５ｃに第２排水開閉弁５ｄが夫々介設され、前記第１排水開閉弁５ｂと第２排水開閉弁５ｄから排出される構成とした。そして、前記制御器１０は、圧縮機本体１が停止されると、先ず前記第１排水開閉弁５ｂと第２排水開閉弁５ｄが開弁する様に構成されている。   On the other hand, the drainage from the water system is a recovered water drainage flow in which the first drainage on-off valve 5b is branched from the water circulation channel 5 between the water separator / collector 4 and the water cooler 6 in the circulating water drainage channel 5a. A second drain on / off valve 5d is provided in each of the passages 5c, and is discharged from the first drain on / off valve 5b and the second drain on / off valve 5d. And the said controller 10 is comprised so that the said 1st drainage on-off valve 5b and the 2nd drainage on-off valve 5d may open first, when the compressor main body 1 is stopped.

すると、水回収分離器４から前記回収水排水流路５ｃを介して、水溜まり部４ａの水が排出される。前記水回収分離器４の水溜まり部４ａ内に設けられたレベル計４ｂからのレベル信号によって、前記制御器１０は、水溜まり部４ａ内の水量が下限まで排出されたことを判断して、前記第２排水開閉弁５ｄを閉弁する。   Then, the water in the water reservoir 4a is discharged from the water recovery separator 4 through the recovered water drainage channel 5c. Based on the level signal from the level meter 4b provided in the water reservoir 4a of the water recovery separator 4, the controller 10 determines that the amount of water in the water reservoir 4a has been discharged to the lower limit, and 2 Close the drainage on-off valve 5d.

ここで、例えば、前記レベル計４ｂを前記水溜り部４ａの底部に接する様に設けて、このレベル計４ｂによって前記水溜り部４ａの水が完全に排出されたことを検知する様に構成し、更に、通常の圧縮機本体１の運転時の水回収分離器４内の水溜り部４ａと気相部との容積比が１：３程度（余り水溜り部４ａの水面が高いと、通常運転時にこの水が吐出流路３の下流側に同伴される恐れがあるため、この程度の容積比に構成するのが望ましい）である様構成されている場合を想定する。   Here, for example, the level meter 4b is provided in contact with the bottom of the water reservoir 4a, and the level meter 4b is configured to detect that the water in the water reservoir 4a has been completely discharged. Furthermore, the volume ratio of the water reservoir 4a and the gas phase portion in the water recovery separator 4 during the operation of the normal compressor body 1 is about 1: 3 (if the water surface of the excess water reservoir 4a is high, It is assumed that the water volume is likely to be entrained on the downstream side of the discharge flow path 3 during operation, so that the volume ratio is preferably set to this level.

この場合、水分離回収器４内の水が全量排出されたとしても、圧縮機本体１の停止直後の吐出圧を０．７ＭＰａとすると、水の容積分だけ前記水分離回収器４内の圧縮気体が膨張するので、（０．７＋０．１）×３÷４−０．１＝０．５ＭＰａ程度の圧力が、水分離回収器４内に残存している。そして、前記第２排水開閉弁５ｄが開弁されると、この残存圧力０．５ＭＰａの作用によって、前記回収水排水流路５ｃを介して水循環流路５内の水が排出される。   In this case, even if all the water in the water separation / recovery unit 4 is discharged, if the discharge pressure immediately after the compressor body 1 is stopped is 0.7 MPa, the compression in the water separation / recovery unit 4 is equivalent to the volume of water. Since the gas expands, a pressure of about (0.7 + 0.1) × 3 ÷ 4-0.1 = 0.5 MPa remains in the water separation / recovery device 4. When the second drainage opening / closing valve 5d is opened, the water in the water circulation channel 5 is discharged through the recovered water drainage channel 5c by the action of the residual pressure of 0.5 MPa.

前記水回収分離器４の底部から回収水排水流路５ｃを介して前記水溜り部４ａの水が排出されるため、前記水回収分離器４内の水とこれに混入しているごみ成分が円滑に排出されるので、前記第２排水開閉弁５ｄが開弁した際に、前記前記水回収分離器４から水クーラ６にごみ成分が流入して、この水クーラ６内の細管を閉塞させることがない。   Since the water in the water reservoir 4a is discharged from the bottom of the water recovery separator 4 through the recovered water drainage channel 5c, the water in the water recovery separator 4 and the waste components mixed therein are Since the water is smoothly discharged, when the second drainage opening / closing valve 5d is opened, waste components flow into the water cooler 6 from the water recovery separator 4 and block the narrow tube in the water cooler 6. There is nothing.

次に、本発明の実施の形態５に係る水潤滑圧縮機の水抜き方法につき、以下添付図５を参照しながら説明する。図５は本発明の実施の形態５に係る水潤滑圧縮機の水抜き方法を説明するための模式的系統図である。尚、本発明の実施の形態５が上記実施の形態１と相違するところは、吐出流路ひいては水循環流路における保圧構成及び排水方法に相違があり、その他は全く同構成であるから、前記吐出流路及び水循環流路における保圧構成排水方法についての説明に止めるものとする。   Next, a water draining method for a water-lubricated compressor according to Embodiment 5 of the present invention will be described below with reference to FIG. FIG. 5 is a schematic system diagram for explaining a water draining method for a water-lubricated compressor according to Embodiment 5 of the present invention. Note that the fifth embodiment of the present invention differs from the first embodiment in that there is a difference in the pressure holding configuration and drainage method in the discharge flow channel and thus in the water circulation flow channel, and the others are completely the same. The explanation is only for the explanation of the pressure holding constitution drainage method in the discharge channel and the water circulation channel.

本発明の実施の形態１においては、圧縮機本体１の停止時における前記吐出流路３及び水循環流路５の内部圧は、吐出閉止手段８と圧縮機本体１、吸込閉止手段９とによって保持されると共に、水系統からの排水は、循環水排水流路５ａに介設された第１排水開閉弁５ｂから、前記内部圧の作用によって排出される構成とした。これに対し、本発明の実施の形態５においては、吐出流路３及び水循環流路５における前記内部圧は、前記吐出閉止手段８、吐出流路３に介設された前記吐出開閉弁１２及び前記循環水排出流路５ａの分岐箇所から圧縮機本体１への水供給箇所１ｃまでの水循環流路５に介設された水循環開閉弁１３によって保持される。   In Embodiment 1 of the present invention, the internal pressures of the discharge flow path 3 and the water circulation flow path 5 when the compressor main body 1 is stopped are held by the discharge closing means 8, the compressor main body 1, and the suction closing means 9. In addition, the drainage from the water system is discharged from the first drainage opening / closing valve 5b interposed in the circulating water drainage channel 5a by the action of the internal pressure. In contrast, in Embodiment 5 of the present invention, the internal pressure in the discharge flow path 3 and the water circulation flow path 5 is the discharge closing means 8, the discharge on-off valve 12 interposed in the discharge flow path 3, and The circulating water discharge channel 5a is held by a water circulation on / off valve 13 provided in the water circulation channel 5 from the branch point to the water supply point 1c to the compressor body 1.

一方、水系統からの排水は、前記水分離回収器４の気相部と前記水分離回収器４から水クーラ６までの間の水循環流路５とを連通し、前記水分離回収器４内の水面より高所に配置した送気流路１４を設け、この送気流路１４に送気開閉弁１４ａを介設すると共に、前記圧縮機本体１の停止時には前記送気開閉弁１４ａを開弁する水抜き方法とした。   On the other hand, the waste water from the water system is communicated with the gas phase portion of the water separation / recovery unit 4 and the water circulation channel 5 between the water separation / recovery unit 4 and the water cooler 6. An air supply passage 14 arranged at a higher position than the water surface is provided, and an air supply opening / closing valve 14a is provided in the air supply passage 14, and the air supply opening / closing valve 14a is opened when the compressor body 1 is stopped. The draining method was used.

上記の如き構成をなすことによって、水分離回収器４内の圧縮気体によって直接水クーラ６内の水を押し出し、前記水クーラ６内の水を円滑に排出することが出来る。即ち、圧縮機本体１が停止されると、前記送気開閉弁１４ａ及び第１排水開閉弁９が開弁される。すると、前記水分離回収器４内の高圧気体が、前記水分離回収器４内の水面より高所に配置された前記送気流路１４から水クーラ６に送気され、この水クーラ６内の水が、水循環流路５を経て循環水排水流路５ａを介して押し出される。   By configuring as described above, the water in the water cooler 6 can be directly pushed out by the compressed gas in the water separator / collector 4 and the water in the water cooler 6 can be smoothly discharged. That is, when the compressor body 1 is stopped, the air supply opening / closing valve 14a and the first drainage opening / closing valve 9 are opened. Then, the high-pressure gas in the water separation / recovery device 4 is sent to the water cooler 6 from the air supply flow path 14 disposed higher than the water surface in the water separation / recovery device 4. Water is extruded through the water circulation channel 5 and the circulating water drain channel 5a.

この様に、前記水分離回収器４内の高圧気体によって、直接水クーラ６内の水を押し出すことが出来るので、前記水クーラ６内部の水を円滑に排出させることが出来る。尚、前記送気流路１４の水循環流路５への合流点が、水分離回収器４の水溜り部４ａの水面より低いと、前記水分離回収器４内の水も多量に排出されるため、前記合流点は前記水溜り部４ａの水面より高い位置とすることが肝要である。   In this way, since the water in the water cooler 6 can be directly pushed out by the high-pressure gas in the water separator / collector 4, the water in the water cooler 6 can be smoothly discharged. If the confluence point of the air supply passage 14 to the water circulation passage 5 is lower than the water surface of the water reservoir 4a of the water separation / recovery device 4, a large amount of water in the water separation / recovery device 4 is also discharged. It is important that the junction point is positioned higher than the water surface of the water reservoir 4a.

以上説明した通り、本発明に係る水潤滑圧縮機の水抜き方法によれば、水分離回収器に後続する吐出流路や吸込流路に閉止手段を介設し、水クーラと圧縮機本体の水供給箇所との間や水分離回収器と水クーラとの間の水循環流路から分岐する排水流路を設け、これらの排水流路に排水開閉弁を介設すると共に、圧縮機本体の停止時には前記閉止手段によって前記吐出流路や吸込流路を閉止する一方、前記排水開閉弁を開弁して排水するので、前記水循環流路に介設された機器のうち、特に水の凍結の影響を受け易い水クーラから確実に水を抜くことが出来、凍結による水クーラの破損等の不具合を回避することが出来る。   As described above, according to the water draining method of the water-lubricated compressor according to the present invention, the discharge channel and the suction channel following the water separation / recovery unit are provided with a closing means, and the water cooler and the compressor main body are Provide drainage channels that diverge from the water circulation path between the water supply points and between the water separator and the water cooler, and install a drain on / off valve in these drainage channels, and stop the compressor body Sometimes, the closing means closes the discharge flow path and the suction flow path, while the drain on / off valve is opened to drain water, so that among the devices interposed in the water circulation flow path, particularly the influence of water freezing It is possible to reliably drain water from a water cooler that is susceptible to damage, and avoid problems such as breakage of the water cooler due to freezing.

尚、本発明の実施の形態においては、圧縮気体の供給先で圧縮気体の需要が少ないときもしくは無いときは、この水潤滑圧縮機の操作者がそれを判断し、入力手段の停止スイッチが押されたことを検知して、あるいはまた、圧力計３ａの検出圧力Ｐｄが上昇して予め定められた所定の上限圧力に達したことを検知して、前記水潤滑圧縮機の水抜きを開始する説明をしたが、本発明に係る水潤滑圧縮機の水抜方法は上記に限らない。   In the embodiment of the present invention, when there is little or no demand for compressed gas at the compressed gas supply destination, the operator of this water-lubricated compressor determines that and the stop switch of the input means is pressed. It is detected that the detected pressure Pd of the pressure gauge 3a has risen to reach a predetermined upper limit pressure, and the water-lubricated compressor starts draining. Although explained, the draining method of the water-lubricated compressor according to the present invention is not limited to the above.

即ち、外気温度もしくは水分離回収器４内の水温の検出手段を設け、前記外気温度もしくは水温が所定温度、例えば水温であれば凍結する０℃に低下した時、圧縮機本体１が起動され、圧力計３ａの検出圧力Ｐｄが所定圧力、例えば０．５ＭＰａ（水循環流路の水が排出されるのに十分な圧力）に至った時、前記圧縮機本体１が停止され、前記水潤滑圧縮機の水抜きを開始することも出来る。あるいは、前記入力手段に強制排水スイッチを設け、このスイッチを入力することにより、圧縮機本体１が起動され、前記水潤滑圧縮機の水抜きを開始しても良い。   That is, a means for detecting the outside air temperature or the water temperature in the water separator / collector 4 is provided, and when the outside air temperature or the water temperature falls to a predetermined temperature, for example, 0 ° C. where it freezes if the water temperature, the compressor body 1 is started, When the detected pressure Pd of the pressure gauge 3a reaches a predetermined pressure, for example, 0.5 MPa (pressure sufficient to discharge water in the water circulation channel), the compressor body 1 is stopped and the water-lubricated compressor You can also start draining water. Alternatively, a forced drain switch may be provided in the input means, and by inputting this switch, the compressor main body 1 may be activated to start draining the water-lubricated compressor.

本発明の実施の形態１に係る水潤滑圧縮機の水抜き方法を説明するための模式的系統図である。It is a typical system diagram for demonstrating the draining method of the water-lubricated compressor which concerns on Embodiment 1 of this invention. 本発明の実施の形態２に係る水潤滑圧縮機の水抜き方法を説明するための模式的系統図である。It is a typical system diagram for demonstrating the draining method of the water-lubricated compressor which concerns on Embodiment 2 of this invention. 本発明の実施の形態３に係る水潤滑圧縮機の水抜き方法を説明するための模式的系統図である。It is a typical system diagram for demonstrating the draining method of the water-lubricated compressor which concerns on Embodiment 3 of this invention. 本発明の実施の形態４に係る水潤滑圧縮機の水抜き方法を説明するための模式的系統図である。It is a typical system diagram for demonstrating the draining method of the water-lubricated compressor which concerns on Embodiment 4 of this invention. 本発明の実施の形態５に係る水潤滑圧縮機の水抜き方法を説明するための模式的系統図である。It is a typical system diagram for demonstrating the draining method of the water-lubricated compressor which concerns on Embodiment 5 of this invention. 従来例に係る凍結防止装置を備えた水噴射圧縮機の正面透視図である。It is a front perspective view of the water-injection compressor provided with the antifreezing apparatus which concerns on a prior art example.

符号の説明Explanation of symbols

Ｍ：駆動モータ， Ｐｄ：検出圧力
１：圧縮機本体， １ａ：吸込口， １ｂ：吐出口，
１ｃ：水供給箇所，
２：吸込流路，
３：吐出流路， ３ａ：圧力計，
４：水分離回収器， ４ａ：水溜り部， ４ｂ：レベル計，
５：水循環流路， ５ａ：循環水排水流路， ５ｂ：第１排水開閉弁，
５ｃ：回収水排水流路， ５ｄ：第２排水開閉弁，
６：水クーラ， ７：フィルター，
８：吐出閉止手段， ９：吸込閉止手段， １０：制御器，
１１：インバータ， １２：吐出開閉弁， １３：水循環開閉弁，
１４：送気流路， １４ａ：送気開閉弁 M: drive motor, Pd: detection pressure 1: compressor body, 1a: suction port, 1b: discharge port,
1c: water supply location,
2: Suction channel,
3: Discharge flow path, 3a: Pressure gauge,
4: Water separator / collector, 4a: Water reservoir, 4b: Level meter,
5: Water circulation channel, 5a: Circulating water drain channel, 5b: First drain on / off valve,
5c: recovered water drainage channel, 5d: second drainage on-off valve,
6: Water cooler, 7: Filter,
8: Discharge closing means, 9: Suction closing means, 10: Controller
11: Inverter, 12: Discharge on / off valve, 13: Water circulation on / off valve,
14: Air supply flow path, 14a: Air supply on / off valve

Claims (7)

圧縮機本体と、この圧縮機本体の吐出流路に介設された水分離回収器と、この水分離回収器により分離された水を前記圧縮機本体の水供給箇所に供給するための水循環流路と、この水循環流路に介設された水クーラとを有する水潤滑圧縮機の水抜き方法において、前記水クーラと圧縮機本体の水供給箇所との間の水循環流路から分岐する循環水排水流路を設け、この循環水排水流路に第１排水開閉弁を介設し、圧縮機本体の停止時には前記第１排水開閉弁を開弁して排水することを特徴とする水潤滑圧縮機の水抜き方法。   A compressor main body, a water separation / recovery device interposed in the discharge flow path of the compressor main body, and a water circulation flow for supplying water separated by the water separation / recovery device to a water supply location of the compressor main body In the method of draining a water-lubricated compressor having a water path and a water cooler interposed in the water circulation channel, the circulating water branches from the water circulation channel between the water cooler and the water supply location of the compressor body A water-lubrication compression system characterized in that a drainage channel is provided, a first drainage on-off valve is provided in the circulating water drainage channel, and the first drainage on-off valve is opened to drain water when the compressor body is stopped. How to drain the machine. 前記水分離回収器に後続する吐出流路に吐出閉止手段を介設し、この吐出閉止手段が、圧縮機本体の停止時には前記吐出流路を閉止する開閉弁、または前記吐出流路の吐出方向にのみ圧縮気体が流れる様に開弁され、かつ保圧機能を有する保圧逆止弁であることを特徴とする請求項１に記載の水潤滑圧縮機の水抜き方法。   Discharge closing means is interposed in the discharge flow path following the water separation and recovery device, and this discharge close means is an on-off valve that closes the discharge flow path when the compressor body stops, or the discharge direction of the discharge flow path 2. The method of draining a water-lubricated compressor according to claim 1, wherein the water-lubricated compressor is a pressure-retaining check valve that is opened so that the compressed gas flows only in the gas and has a pressure retaining function. 前記圧縮機本体の吸込流路に吸込閉止手段を介設し、この吸込閉止手段が、圧縮機本体の停止時には前記吸込流路を閉止する開閉弁、または前記吸込流路の吸込方向にのみ気体が流れる様に開弁される逆止弁であることを特徴とする請求項１または２に記載の水潤滑圧縮機の水抜き方法。   A suction closing means is provided in the suction flow path of the compressor body, and the suction closing means is an open / close valve that closes the suction flow path when the compressor main body is stopped, or gas only in the suction direction of the suction flow path. The water draining method for a water-lubricated compressor according to claim 1 or 2, characterized in that the check valve is opened so as to flow. 前記圧縮機本体の吐出口から前記水分離回収器までの吐出流路に吐出開閉弁を介設し、前記圧縮機本体の停止時には前記吐出開閉弁を閉弁することを特徴とする請求項１乃至３のうちの何れか一つの項に記載の水潤滑圧縮機の水抜き方法。   The discharge opening / closing valve is interposed in the discharge flow path from the discharge port of the compressor main body to the water separation and recovery device, and the discharge opening / closing valve is closed when the compressor main body is stopped. The method for draining water-lubricated compressor according to any one of items 1 to 3. 前記循環水排出流路の分岐箇所から圧縮機本体への水供給箇所までの水循環流路に水循環開閉弁を介設し、前記圧縮機本体の停止時には前記水循環開閉弁を閉弁することを特徴とする請求項１乃至４のうちの何れか一つの項に記載の水潤滑圧縮機の水抜き方法。   A water circulation on / off valve is interposed in a water circulation channel from a branching point of the circulating water discharge channel to a water supply point to the compressor body, and the water circulation on / off valve is closed when the compressor body is stopped. The water draining method for a water-lubricated compressor according to any one of claims 1 to 4. 前記水分離回収器と水クーラとの間の水循環流路から分岐する回収水排水流路を設け、この回収水排水流路に第２排水開閉弁を介設すると共に、前記圧縮機本体の停止時には前記第２排水開閉弁を開弁して排水することを特徴とする請求項１乃至５のうちの何れか一つの項に記載の水潤滑圧縮機の水抜き方法。   A recovered water drainage channel branched from a water circulation channel between the water separation and recovery unit and the water cooler is provided, and a second drainage opening / closing valve is interposed in the recovered water drainage channel, and the compressor body is stopped. The drainage method for a water-lubricated compressor according to any one of claims 1 to 5, characterized in that the second drainage on-off valve is sometimes opened to drain water. 前記水分離回収器の気相部と前記水分離回収器から水クーラまでの間の水循環流路とを連通し、前記水分離回収器内の水面より高所に配置した送気流路を設け、この送気流路に送気開閉弁を介設すると共に、前記圧縮機本体の停止時には前記送気開閉弁を開弁することを特徴とする請求項１乃至６のうちの何れか一つの項に記載の水潤滑圧縮機の水抜き方法。   Communicating the gas phase part of the water separation and recovery unit and the water circulation channel between the water separation and recovery unit and the water cooler, and providing an air supply channel arranged at a higher position than the water surface in the water separation and recovery unit; The air supply opening / closing valve is interposed in the air supply flow path, and the air supply opening / closing valve is opened when the compressor body is stopped. A method for draining a water-lubricated compressor as described.

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