WO2012023463A1 - Clearance pocket for reciprocating compressor - Google Patents
Clearance pocket for reciprocating compressor Download PDFInfo
- Publication number
- WO2012023463A1 WO2012023463A1 PCT/JP2011/068206 JP2011068206W WO2012023463A1 WO 2012023463 A1 WO2012023463 A1 WO 2012023463A1 JP 2011068206 W JP2011068206 W JP 2011068206W WO 2012023463 A1 WO2012023463 A1 WO 2012023463A1
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- WIPO (PCT)
- Prior art keywords
- clearance
- piston
- nut
- reciprocating compressor
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/125—Cylinder heads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
- F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/122—Cylinder block
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/16—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by adjusting the capacity of dead spaces of working chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
Definitions
- the present invention relates to a clearance pocket of a reciprocating compressor, and in particular, a nut that is screwed to a rod of a clearance piston is made into two bodies that are engaged via a spring member, and stable operation and remote operation are achieved by screwing without backlash.
- the present invention relates to a new improvement for making it possible.
- FIG. 3 the configuration disclosed in Patent Document 1 can be cited as FIG. That is, in FIG. 3, the balance chamber 61 is defined by slidably fitting the second piston body 7 to the clearance pocket 3 and the clearance pocket body 60, and the pressure chamber 2 a and the balance chamber 61 are separated by the communication path 62.
- the balance is such that the second piston body 7 is connected to the first piston body 4 by the first connecting rod 5 and the gas pressure in the pressure chamber 2 a is led to the balance chamber 61 so as to face the adjustment chamber 31.
- FIG. 4 is a cross-sectional view showing the clearance pocket of the main part of the reciprocating compressor.
- the gap adjusting rod 43 has a clearance pocket 41a for closing the cylinder 40 in which the tapered rod portion 43t on the tip side accommodates the piston.
- a screw rod portion 43s on the proximal end side is provided in the partition wall 41b of the cylinder cover 41 so as to be positioned in a tapered gas passage hole 41c that allows the clearance pocket 41a and the head side gas compression chamber 40h of the cylinder 40 to communicate with each other.
- a male screw of a rod support bracket 44 fixed to an outer lid 42 that closes the cylinder cover 41 is screwed and supported, and a protruding end of the clearance adjustment rod 43 from the rod support bracket 44 is a stepping motor. It is connected to the output shaft 45 and rotated in the longitudinal direction by rotating the gap adjusting rod 43 forward and backward. It has a configuration to be dynamic. Therefore, if the gap volume is continuously changed by remote operation, the suction amount of the compressor also changes continuously, so even if the gas amount required in the process changes from moment to moment, only the necessary gas amount is compressed. A big energy-saving effect is acquired. For this reason, there is a device that is configured so that the clearance pocket volume can be remotely controlled by using an actuator, and that a required amount is automatically discharged via a control device using a measured value according to process conditions such as discharge pressure. It is used.
- the hydraulic cylinder can generate a large force with a small actuator, and the hydraulic oil has a very small compressibility, so that it does not cause vibration due to a variable load. It has been.
- a large fluctuation load is applied to the capacity adjustment piston (clearance piston) of the clearance pocket directly connected to the gas compression chamber of this cylinder because the pressure fluctuations corresponding to the suction, compression and discharge strokes of the gas into the cylinder act.
- a driving method that does not use hydraulic pressure is desirable in order to avoid ignition by high-pressure oxygen.
- FIG. 3 the conventional configuration of FIG.
- the taper rod portion at the tip of the screw rod portion is inserted into the tapered gas passage hole, and the degree of communication with the clearance pocket is adjusted depending on the insertion condition. Since the gas inflow / outflow passages are narrow, there is a disadvantage that the pressure loss is increased. Further, although not shown, the manual clearance pocket also employs driving by a screw actuator. In this case, the thread surface may be hit by a fluctuating load, which may cause damage. In order to avoid this, in the manual type, when the movement of the piston is finished, another lock nut is tightened to prevent damage due to tapping of the thread surface due to fluctuating load.
- an object of the present invention is to make two nuts that engage with a rod of a clearance piston through a spring member, and to perform reciprocating motion that enables stable operation, remote operation, etc. by screwing without backlash. It is to provide a clearance pocket for the compressor.
- the clearance pocket of the reciprocating compressor includes a cylinder in which a suction port and a discharge port are formed and a piston is provided, and an upper gas compression chamber and a lower gas compression chamber that are divided by the piston in the cylinder.
- a clearance pocket main body provided at an upper portion of the cylinder and communicating with the upper gas compression chamber and having a pocket chamber and a pocket back pressure chamber; a clearance piston in the clearance pocket main body; and for sliding the clearance piston
- a clearance pocket of a reciprocating compressor wherein the volume of the pocket chamber communicating with the upper gas compression chamber is variable by sliding of the clearance piston, provided in the clearance piston. It has a male screw and is held in a non-rotating state by a detent.
- a first gear provided on an outer periphery of the nut; and a second gear provided on the driving body and meshed with the first gear, and the rod and the clearance piston are moved by driving the driving body.
- the suction pressure is applied, and the spring member is a disc spring.
- the clearance pocket of the reciprocating compressor is configured as described above, the following effects can be obtained. That is, a cylinder in which a suction port and a discharge port are formed and a piston is provided; an upper gas compression chamber and a lower gas compression chamber that are divided by the piston in the cylinder; A clearance pocket body communicating with the gas compression chamber and having a pocket chamber and a pocket back pressure chamber; a clearance piston in the clearance pocket body; and a driving body for sliding the clearance piston, the clearance piston
- the clearance screw In the clearance pocket of the reciprocating compressor in which the volume of the pocket chamber communicating with the upper gas compression chamber is variable by sliding, the clearance screw has a male screw and is not rotated by the rotation stop.
- a rod held in a state, and a nut screwed to the male screw By forming the nut and having first and second nut portions that are urged and engaged in opposite directions via the spring member, the spring member is sandwiched between the two nut portions, Since the load is applied, there is no backlash in the meshing part of the screw, and even if a fluctuating load is applied to the rod, the thread surface is not damaged by tapping.
- the clearance piston moves forward and backward by rotating the female screw on the cylinder side forward and backward.
- the force of the spring member acts on the thread surface, so even if a fluctuating load is applied, the thread surface is always pushed in one direction and a frictional force is acting. The piston never moves by itself.
- a first gear provided on an outer periphery of the nut; and a second gear provided on the driving body and meshed with the first gear, and the rod and the clearance piston are moved by driving the driving body.
- the control device is configured to take in an input signal on the process side and advance / retreat the clearance piston so that a required gas amount is obtained, the capacity of the compressor can be automatically adjusted.
- the fluctuating load acting on the clearance piston is greatly influenced by the suction / discharge pressure of the compressor, the mass of the parts, and the back pressure acting on the pocket back pressure chamber of the clearance piston.
- FIG. 1 It is a schematic block diagram which shows the clearance pocket of the reciprocating compressor by this invention. It is an expanded sectional view which shows the specific structure of the clearance pocket of FIG. It is a block diagram which shows the conventional reciprocating compressor. It is sectional drawing which shows the principal part of the conventional reciprocating compressor.
- FIG. 1 A preferred embodiment of a clearance pocket of a reciprocating compressor according to the present invention will be described below with reference to the drawings.
- the same reference numerals are used for the same or equivalent parts as in FIG.
- a cylinder 1 is installed on a compressor frame 1 ⁇ / b> A, and a piston 2 driven via a piston rod 2 c is reciprocated in the cylinder 1.
- the cylinder 1 is a double acting type that compresses gas on both the upper and lower surfaces of the piston 2, and the upper gas compression chamber 2a and the lower gas compression chamber 2b have suction valves 12a and 12b and discharge valves 14a and 14b, respectively. Is installed.
- cylinder valves (intake valves 12a, 12b and discharge valves 14a, 14b) are check valves that are opened and closed passively by a differential pressure across the cylinder.
- a clearance pocket 6 is provided in the upper part of the cylinder 1, and the volume of the clearance pocket 6 can be changed by a drive unit 8 of the clearance pocket.
- a suction port 13a for sucking the suction gas A is formed on the suction valve 12a, 12b side of the cylinder 1, and a discharge port for discharging the discharge gas B on the discharge valve 14a, 14b side. 13b is formed.
- a pair of mounting flange portions 50 are provided on both sides of the clearance pocket main body 60 of the clearance pocket 6, and a first gap between the upper gas compression chamber 2 a of the cylinder 1 and the pocket back pressure chamber 51 of the clearance pocket main body 60 is the first.
- the first pressure guiding pipe 55 having the throttle 52 communicates therewith.
- the suction port 13 a for the suction gas A and the pocket back pressure chamber 51 are communicated by a second pressure guiding pipe 55 A having a second throttle 54.
- FIG. 2 is a detailed enlarged view of the clearance pocket 6 of FIG. 1, and a clearance piston 58 including a slipper ring 56 and a rider ring 57 is provided in the clearance pocket main body 60 so as to be slidable in the vertical direction. Yes.
- a rod 59 provided on the clearance piston 58 extends upward through a seal 72 a of a cover 70 provided on the upper surface of the clearance pocket main body 60 and a seal fixing lid 72.
- the gas is configured not to leak out of the clearance pocket main body 60 and the cover 70.
- a male screw 59a is formed on the upper portion of the rod 59, and a nut 74 having a female screw 73 screwed to the male screw 59a is provided on the outer periphery of the male screw 59a.
- the nut 74 includes a first nut portion 75 as an upper screw having a female screw 73 and a second nut portion 76 as a lower screw having a female screw 73.
- Each of the nut portions 75 and 76 is, for example, a disc spring or the like. It is configured to be slightly slid while being biased in the reverse direction via the spring member 77 made of
- a support portion 79 made of a plurality of rod-like bodies or the like is provided in a planted state, and an end portion 84a of a detent 84 provided on the rod 59 is connected to the support portion 79.
- the rod 59 is configured to move up and down along the positive load direction C and the negative load direction D and not rotate.
- a trapezoidal machine base 90 is fixed to the upper portion of the support portion 79, and the nut 74 is rotatably held on the machine base 90 via a pair of bearings 91.
- a first gear 93 is fixedly provided on the outer periphery of the second nut portion 76 through a key 92.
- a drive body 94 made of an air motor or the like is provided on the upper part of the machine base 90, and a second gear 96 provided on a rotation shaft 95 of the drive body 94 is engaged with the first gear 93. Accordingly, when the driving body 94 is driven, the nut 74 rotates through the gears 93 and 96, whereby the clearance piston 58 moves up and down and the air supply port (not shown) of the driving body 94 is switched. Thus, the nut 74 can be rotated forward and backward. Accordingly, the clearance pocket driving section 8 shown in FIG. 1 includes the aforementioned male screw 59a, nut 74, gears 93 and 96, machine base 90, support section 79, driving body 94, and the like.
- the cylinder 1 and the pocket back pressure chamber 51 are connected via a first pressure guiding pipe 55 having a first throttle 52. Further, the pressure in the cylinder 1 fluctuates between the suction and discharge pressures as the piston 2 moves up and down. However, since the first throttle 52 is provided, the gas enters and exits the pocket back pressure chamber 51 due to this, resulting in the result.
- the pocket back pressure chamber 51 is maintained at the average pressure of the suction pressure and the discharge pressure.
- a pressure that is half of the suction / discharge pressure difference alternately acts in the positive and negative directions C and D every one cycle on the clearance piston 58.
- the actual load state varies somewhat depending on the difference in pressure-receiving area of the cross-sectional integral of the rod 59 and the mass of the clearance piston 58 and the rod 59.
- the suction port 13a of the suction gas A of the cylinder 1 or the suction valve chamber 12A and the pocket back pressure chamber 51 are connected via the second pressure guiding pipe 55A having the second throttle 54. To do.
- the suction port 13a and the suction valve chamber 12A also vary in pressure due to intermittent suction operation into the cylinder 1, it is desirable to insert a second throttle 54 in the middle of the second pressure guiding pipe 55A.
- the clearance piston 58 is generally applied with a load corresponding to the difference in suction / discharge pressure intermittently only in the positive direction C.
- the present invention is not limited to the above-described embodiment, and can be appropriately modified and improved.
- the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and not limited as long as the present invention can be achieved.
- the clearance pocket of the reciprocating compressor according to the present invention can easily perform variable capacity operation such as gas compression in a chemical plant or the like by remote control.
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- General Engineering & Computer Science (AREA)
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- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
Description
すなわち、図3において、クリアランスポケット3と、クリアランスポケット本体60に第2ピストン体7を摺動自在に嵌合させてバランス室61が区画され、連通路62によって圧力室2aとバランス室61とが連通されると共に、第2ピストン体7が第1連結棒5によって第1ピストン体4に連結されて、バランス室61に、圧力室2a内のガス圧力が調節室31と対向させて導かれるバランス装置6と、第1ピストン体4を所定位置に移動させて調節室31の容積を増減化させる作動装置(クリアランスポケットの駆動部)8とを有すると共に、アクチュエータとしては油圧手段11が用いられている。また、圧縮機の容量を減少させたいとき、シリンダ1内に接続されたクリアランスポケット3を開くことにより、シリンダ1の隙間容積を増加させる。往復動圧縮機では、吐出行程が終わり吸入行程に入ってもシリンダ1内の隙間容積部に残った圧縮ガスが膨張するため、シリンダ1内の圧力が吸入圧力より低くなるまでガスの吸入は行われない。隙間容積を大きくすると、吸入行程で膨張ガスが占める体積が増加し、その分吸入量が減少する。この容量制御方式では、ピストン2が圧縮するガス量そのものが減るため消費動力も節減ができる。 One of the conventional capacity control methods for reciprocating compressors is a clearance pocket. As a typical configuration, the configuration disclosed in
That is, in FIG. 3, the
すなわち、図4は往復動圧縮機の要部のクリアランスポケットを示す断面図であり、隙間調整ロッド43が、先端側のテーパロッド部43tがピストンを収容するシリンダ40を閉蓋するクリアランスポケット41aを有するシリンダカバー41の隔壁41bに設けられ、クリアランスポケット41aとシリンダ40のヘッド側ガス圧縮室40hとを連通させるテーパ孔状のガス通過孔41c内に位置するように、基端側のねじロッド部43sのおねじをシリンダカバー41を閉蓋する外蓋42に固着されているロッド支持金具44のめねじを螺着して支持し、隙間調整ロッド43のロッド支持金具44からの突出端をステッピングモーター45の出力軸に連結して、この隙間調整ロッド43を正逆自在に回転させることにより長手方向に往復動させる構成としている。
従って、隙間容積を遠隔操作で連続的に変化させれば、圧縮機の吸入量も連続的に変化するため、プロセスで必要となるガス量が時々刻々と変わる場合でも必要ガス量のみを圧縮することで大きな省エネ効果が得られる。このためアクチュエータを用いてクリアランスポケットの容積を遠隔操作できるように構成し、吐出圧力などのプロセス条件に応じて測定値を用いて制御装置を介して自動で必要量を吐出するよう制御する装置が用いられている。 As a variable capacity reciprocating compressor using a clearance pocket, the configuration disclosed in
That is, FIG. 4 is a cross-sectional view showing the clearance pocket of the main part of the reciprocating compressor. The
Therefore, if the gap volume is continuously changed by remote operation, the suction amount of the compressor also changes continuously, so even if the gas amount required in the process changes from moment to moment, only the necessary gas amount is compressed. A big energy-saving effect is acquired. For this reason, there is a device that is configured so that the clearance pocket volume can be remotely controlled by using an actuator, and that a required amount is automatically discharged via a control device using a measured value according to process conditions such as discharge pressure. It is used.
また、例えば、助燃性が強い酸素ガス用の圧縮機では、高圧酸素による発火を避けるために油圧を用いない駆動方法が望ましい。
また、前述の図4の従来構成の場合、ねじロッド部の先端のテーパロッド部をテーパ孔状のガス通過孔に挿入し、その挿入具合によってクリアランスポケットに連通する度合を調整しているが、ポケットへのガス流入・流出通路が狭いため、圧力損失が大きくなる欠点がある。
更に、図示していないが、手動式のクリアランスポケットでは、ねじ式アクチュエータによる駆動も採用されている。この場合、変動荷重によりねじ面が叩かれ、破損の原因となる恐れがある。これを避けるために手動式では、ピストンの移動を終了した時点で、別のロックナットを締付けることで、変動荷重によるねじ面の叩きによる破損を避ける構造としている。ただし、遠隔操作で2つのナットを個別に回転させるためには複雑な機構が必要であり、設置スペースやコスト面で問題があり、また、機械の信頼性を高めるのが困難であった。
そこで、本発明の目的は、クリアランスピストンのロッドに螺合するナットを、ばね部材を介して係合する二体とし、ガタのない螺合により安定した動作と遠隔操作等を可能とする往復動圧縮機のクリアランスポケットを提供することにある。 In the case of the conventional configuration shown in FIG. 3 described above, the hydraulic cylinder can generate a large force with a small actuator, and the hydraulic oil has a very small compressibility, so that it does not cause vibration due to a variable load. It has been. A large fluctuation load is applied to the capacity adjustment piston (clearance piston) of the clearance pocket directly connected to the gas compression chamber of this cylinder because the pressure fluctuations corresponding to the suction, compression and discharge strokes of the gas into the cylinder act. .
In addition, for example, in a compressor for oxygen gas having a strong assist property, a driving method that does not use hydraulic pressure is desirable in order to avoid ignition by high-pressure oxygen.
In the case of the conventional configuration of FIG. 4 described above, the taper rod portion at the tip of the screw rod portion is inserted into the tapered gas passage hole, and the degree of communication with the clearance pocket is adjusted depending on the insertion condition. Since the gas inflow / outflow passages are narrow, there is a disadvantage that the pressure loss is increased.
Further, although not shown, the manual clearance pocket also employs driving by a screw actuator. In this case, the thread surface may be hit by a fluctuating load, which may cause damage. In order to avoid this, in the manual type, when the movement of the piston is finished, another lock nut is tightened to prevent damage due to tapping of the thread surface due to fluctuating load. However, in order to rotate the two nuts individually by remote control, a complicated mechanism is required, which causes problems in terms of installation space and cost, and it is difficult to improve the reliability of the machine.
Accordingly, an object of the present invention is to make two nuts that engage with a rod of a clearance piston through a spring member, and to perform reciprocating motion that enables stable operation, remote operation, etc. by screwing without backlash. It is to provide a clearance pocket for the compressor.
すなわち、吸入口と吐出口が形成されピストンが内設されたシリンダと、前記シリンダ内に前記ピストンにより分割された上側ガス圧縮室及び下側ガス圧縮室と、前記シリンダの上部に設けられ前記上側ガス圧縮室と連通すると共にポケット室とポケット背圧室とを有するクリアランスポケット本体と、前記クリアランスポケット本体内のクリアランスピストンと、前記クリアランスピストンを摺動させるための駆動体とを備え、前記クリアランスピストンの摺動により、前記上側ガス圧縮室と連通する前記ポケット室の容積を可変とするようにした往復動圧縮機のクリアランスポケットにおいて、前記クリアランスビストンに設けられおねじを有すると共に廻り止めにより非回転状態に保持されたロッドと、前記おねじに螺合するナットと、前記ナットを形成し、ばね部材を介して互いに逆方向に付勢されて係合する第1、第2ナット部とを有することにより、2つのナット部間にばね部材を挟み込み、めねじに予め荷重をかけられているため、ねじの噛合い部にガタがなくなり、ロッドに変動荷重が作用しても、ねじ面の叩きによる破損が起こらない。また、クリアランスピストンの前進と後退は、シリンダ側のめねじを正転及び逆転させることで行う。また、クリアランスピストンが停止している状態では、ねじ面にはばね部材の力が働いているので、変動荷重が作用してもねじ面が常に一方向に押され摩擦力が働いており、クリアランスピストンが勝手に移動することはない。
また、前記ナットの外周に設けられた第1歯車と、前記駆動体に設けられ前記第1歯車と噛合する第2歯車とを有し、前記駆動体の駆動により前記ロッド及びクリアランスピストンの移動を行うことにより、駆動体を用いて歯車を回転させクリアランスピストンを前進・後退させることで、遠隔操作により隙間容積を変更することが可能となる。プロセス側の入力信号を取り込み、必要とされるガス量となるようにクリアランスピストンの前進・後退を行うよう制御装置を構成すれば、自動で圧縮機の容量調節を行うことが可能である。
また、クリアランスピストンに作用する変動荷重は、圧縮機の吸入・吐出圧力、部品質量のほか、クリアランスピストンのポケット背圧室に作用させる背圧が大きく影響する。ポケット背圧室にシリンダ内の平均圧力を作用させる場合は、シリンダ内とポケット背圧室をオリフィスなどの絞りを介して接続することになる。ただし、これはクリアランスピストンの前面からポケット背圧室に連通する細い穴を設けることでも同じ作用を得られるため、構造が簡単になる。一方、クリアランスピストンに働く荷重の振幅は、上下方向に大きく変化するため、ナット間に働かせるばね力を大きくする必要がある。更にクリアランスピストンを移動させるためナットを回転させるのに必要なトルクも大きくなる欠点がある。
ポケット背圧室に吸入圧力を作用させた場合でも荷重の振幅としては上記と同等だが、質量による荷重は圧力荷重に対して比較的小さいことにより、上向きの荷重が主で下向きの荷重はわずかなものとなる。このためばね部材で作用させるばね力は小さなものでよく、ナットを回転させるのに必要なトルクも小さくできる。 Since the clearance pocket of the reciprocating compressor according to the present invention is configured as described above, the following effects can be obtained.
That is, a cylinder in which a suction port and a discharge port are formed and a piston is provided; an upper gas compression chamber and a lower gas compression chamber that are divided by the piston in the cylinder; A clearance pocket body communicating with the gas compression chamber and having a pocket chamber and a pocket back pressure chamber; a clearance piston in the clearance pocket body; and a driving body for sliding the clearance piston, the clearance piston In the clearance pocket of the reciprocating compressor in which the volume of the pocket chamber communicating with the upper gas compression chamber is variable by sliding, the clearance screw has a male screw and is not rotated by the rotation stop. A rod held in a state, and a nut screwed to the male screw By forming the nut and having first and second nut portions that are urged and engaged in opposite directions via the spring member, the spring member is sandwiched between the two nut portions, Since the load is applied, there is no backlash in the meshing part of the screw, and even if a fluctuating load is applied to the rod, the thread surface is not damaged by tapping. The clearance piston moves forward and backward by rotating the female screw on the cylinder side forward and backward. In addition, when the clearance piston is stopped, the force of the spring member acts on the thread surface, so even if a fluctuating load is applied, the thread surface is always pushed in one direction and a frictional force is acting. The piston never moves by itself.
A first gear provided on an outer periphery of the nut; and a second gear provided on the driving body and meshed with the first gear, and the rod and the clearance piston are moved by driving the driving body. By doing so, it is possible to change the clearance volume by remote control by rotating the gear using the driving body and moving the clearance piston forward and backward. If the control device is configured to take in an input signal on the process side and advance / retreat the clearance piston so that a required gas amount is obtained, the capacity of the compressor can be automatically adjusted.
In addition, the fluctuating load acting on the clearance piston is greatly influenced by the suction / discharge pressure of the compressor, the mass of the parts, and the back pressure acting on the pocket back pressure chamber of the clearance piston. When the average pressure in the cylinder is applied to the pocket back pressure chamber, the inside of the cylinder and the pocket back pressure chamber are connected to each other through a restriction such as an orifice. However, since the same effect can be obtained by providing a narrow hole communicating with the pocket back pressure chamber from the front surface of the clearance piston, the structure is simplified. On the other hand, since the amplitude of the load acting on the clearance piston changes greatly in the vertical direction, it is necessary to increase the spring force acting between the nuts. Furthermore, there is a disadvantage that the torque required to rotate the nut to move the clearance piston also increases.
Even when suction pressure is applied to the pocket back pressure chamber, the amplitude of the load is the same as above, but the load by mass is relatively small compared to the pressure load, so the upward load is mainly and the downward load is slight. It will be a thing. For this reason, the spring force applied by the spring member may be small, and the torque required to rotate the nut can also be reduced.
尚、図3と同一又は同等部分には同一符号を用いて説明する。
図1において、圧縮機のフレーム1A上にシリンダ1が設置され、ピストン棒2cを介して駆動されるピストン2はシリンダ1内で往復動される。このシリンダ1はピストン2の上面と下面の両側でガスを圧縮するダブルアクティング式であり、上側ガス圧縮室2a及び下側ガス圧縮室2bにはそれぞれ吸入弁12a,12b及び吐出弁14a,14bが設置されている。これらシリンダ弁(吸入弁12a,12bと吐出弁14a,14b)は前後の差圧により受動的に開閉する逆止弁となっている。
前記シリンダ1の上部にはクリアランスポケット6が設けてあり、クリアランスポケット6の容積はクリアランスポケットの駆動部8で変更可能に構成されている。 A preferred embodiment of a clearance pocket of a reciprocating compressor according to the present invention will be described below with reference to the drawings.
The same reference numerals are used for the same or equivalent parts as in FIG.
In FIG. 1, a
A
前記クリアランスポケット6のクリアランスポケット本体60の両側には一対の取付フランジ部50が設けられ、前記シリンダ1の上側ガス圧縮室2aとクリアランスポケット本体60のポケット背圧室51との間は、第1絞り52を有する第1導圧配管55によって連通されている。
また、前記吸入ガスAの吸入口13aと前記ポケット背圧室51との間は、第2絞り54を有する第2導圧配管55Aによって連通されている。 A
A pair of mounting
Further, the
前記ロッド59の上部には、おねじ59aが形成され、このおねじ59a外周には、おねじ59aに螺合するめねじ73を有するナット74が設けられている。 A
A
従って、駆動体94の駆動により、各歯車93,96を介してナット74が回転することにより、クリアランスピストン58が上下動すると共に、駆動体94のエアの供給ポート(図示せず)を切り替えることにより、ナット74の正転・逆転ができるように構成されている。従って、図1のクリアランスポケットの駆動部8は、前述のおねじ59a、ナット74、各歯車93,96、機械台90、サポート部79及び駆動体94等により構成されている。 A
Accordingly, when the driving
また、別の方法として、図1のようにシリンダ1の吸入ガスAの吸入口13a又は吸入弁室12Aとポケット背圧室51を第2絞り54を有する第2導圧配管55Aを介して接続する。前記吸入口13aや吸入弁室12Aもシリンダ1内への間欠的な吸入動作により圧力変動があるので、第2導圧配管55Aの途中に第2絞り54を入れるのが望ましい。この場合、クリアランスピストン58には概略で吸入/吐出圧力差分の荷重が正方向Cにのみ間欠的に作用する。 In the case described above, when the
As another method, as shown in FIG. 1, the
1A フレーム
2 ピストン
2a 上側ガス圧縮室
2b 下側ガス圧縮室
2c ピストン棒
A 吸入ガス
B 吐出ガス
C 正の荷重方向
D 負の荷重方向
6 クリアランスポケット
8 クリアランスポケットの駆動部
12a,12b 吸入弁
12A 吸入弁室
13a 吸入口
13b 吐出口
14a,14b 吐出弁
31 ポケット室
50 取付フランジ部
51 ポケット背圧室
52 第1絞り
54 第2絞り
55 第1導圧配管
55A 第2導圧配管
56 スリッパーリング
57 ライダーリング
58 クリアランスピストン
59 ロッド
59a おねじ
60 クリアランスポケット本体
70 カバー
71 Oリング
72 シール固定蓋
72a シール
73 めねじ
74 ナット
75 第1ナット部(上ねじ)
76 第2ナット部(下ねじ)
77 ばね部材(皿ばね)
78 止めねじ
79 サポート部
84 廻り止め
90 機械台
91 軸受
92 キー
94 駆動体
93 第1歯車
96 第2歯車 1
76 Second nut (bottom screw)
77 Spring member (disc spring)
78
Claims (7)
- 吸入口と吐出口が形成されピストンが内設されたシリンダと、
前記シリンダ内で前記ピストンにより分割された上側ガス圧縮室及び下側ガス圧縮室と、
前記シリンダの上部に設けられ前記上側ガス圧縮室と連通すると共にポケット室とポケット背圧室とを有するクリアランスポケット本体と、
前記クリアランスポケット本体内のクリアランスピストンと、
前記クリアランスピストンを摺動させるための駆動体と、を備え、
前記クリアランスピストンの摺動により、前記上側ガス圧縮室と連通する前記ポケット室の容積を可変とするようにした往復動圧縮機のクリアランスポケットにおいて、
前記クリアランスピストンに設けられおねじを有すると共に廻り止めにより非回転状態に保持されたロッドと、
前記おねじに螺合するナットと、
前記ナットを構成し、ばね部材を介して互いに逆方向に付勢されて係合する第1ナット部及び第2ナット部と、
を有する往復動圧縮機のクリアランスポケット。 A cylinder in which a suction port and a discharge port are formed and a piston is installed;
An upper gas compression chamber and a lower gas compression chamber divided by the piston in the cylinder;
A clearance pocket body provided at an upper portion of the cylinder and communicating with the upper gas compression chamber and having a pocket chamber and a pocket back pressure chamber;
A clearance piston in the clearance pocket body;
A driving body for sliding the clearance piston,
In the clearance pocket of the reciprocating compressor in which the volume of the pocket chamber communicating with the upper gas compression chamber is variable by sliding the clearance piston,
A rod that is provided on the clearance piston and has a male screw and is held in a non-rotating state by a detent;
A nut screwed into the male screw;
A first nut part and a second nut part which constitute the nut and are urged and engaged in opposite directions via a spring member;
Clearance pocket of reciprocating compressor having - 前記ナットの外周に設けられた第1歯車と、前記駆動体に設けられ前記第1歯車と噛合する第2歯車とを有し、前記駆動体の駆動により前記ロッド及び前記クリアランスピストンの移動を行う請求項1記載の往復動圧縮機のクリアランスポケット。 A first gear provided on an outer periphery of the nut; and a second gear provided on the driving body and meshed with the first gear, and the rod and the clearance piston are moved by driving the driving body. The clearance pocket of the reciprocating compressor according to claim 1.
- 前記クリアランスピストンのピストン背圧として、前記シリンダの吸入圧と吐出圧の中間の中間圧を作用させる請求項1又は2記載の往復動圧縮機のクリアランスポケット。 The clearance pocket of the reciprocating compressor according to claim 1 or 2, wherein an intermediate pressure between the suction pressure and the discharge pressure of the cylinder is applied as a piston back pressure of the clearance piston.
- 前記クリアランスピストンのピストン背圧として、前記シリンダの吸入圧を作用させる請求項1又は2記載の往復動圧縮機のクリアランスポケット。 The clearance pocket of the reciprocating compressor according to claim 1 or 2, wherein the suction pressure of the cylinder acts as a piston back pressure of the clearance piston.
- 前記ばね部材は、皿ばねからなる請求項1又は2に記載の往復動圧縮機のクリアランスポケット。 The clearance pocket of the reciprocating compressor according to claim 1 or 2, wherein the spring member is a disc spring.
- 前記ばね部材は、皿ばねからなる請求項3に記載の往復動圧縮機のクリアランスポケット。 The clearance pocket of the reciprocating compressor according to claim 3, wherein the spring member is a disc spring.
- 前記ばね部材は、皿ばねからなる請求項4に記載の往復動圧縮機のクリアランスポケット。 The clearance pocket of the reciprocating compressor according to claim 4, wherein the spring member comprises a disc spring.
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CN2011800394489A CN103069164A (en) | 2010-08-17 | 2011-08-09 | Clearance pocket for reciprocating compressor |
KR1020137003818A KR101744370B1 (en) | 2010-08-17 | 2011-08-09 | Clearance pocket for reciprocating compressor |
CH00469/13A CH705559B1 (en) | 2010-08-17 | 2011-08-09 | Still room for reciprocating compressor. |
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JP2010182245A JP5210363B2 (en) | 2010-08-17 | 2010-08-17 | Reciprocating compressor clearance pocket |
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JP (1) | JP5210363B2 (en) |
KR (1) | KR101744370B1 (en) |
CN (1) | CN103069164A (en) |
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WO2014127905A1 (en) * | 2013-02-19 | 2014-08-28 | Wabco Gmbh | Piston compressor |
AT514199B1 (en) * | 2013-10-18 | 2014-11-15 | Hoerbiger Kompressortech Hold | Adjustment device for an adjusting piston of a variable Zuschaltraumes a reciprocating compressor |
CN108999772A (en) * | 2018-08-28 | 2018-12-14 | 沈阳远大压缩机自控***有限公司 | Reciprocating compressor automatic electric drives full flow clearance stepless regulating system and method |
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JP5437298B2 (en) * | 2011-03-09 | 2014-03-12 | 株式会社日本製鋼所 | Reciprocating compressor clearance pocket |
CN109882395B (en) * | 2019-04-22 | 2024-03-22 | 山东易阳石化节能装备有限公司 | Pressure control air bag type clearance stepless adjustment executing mechanism and method |
CN112012916B (en) * | 2020-08-05 | 2022-05-24 | 加西贝拉压缩机有限公司 | Piston type variable-frequency and variable-capacity refrigeration compressor |
CN112012917A (en) * | 2020-08-05 | 2020-12-01 | 加西贝拉压缩机有限公司 | Compressor variable volume structure with drainage groove |
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- 2011-08-09 CN CN2011800394489A patent/CN103069164A/en active Pending
- 2011-08-09 CH CH00469/13A patent/CH705559B1/en unknown
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Also Published As
Publication number | Publication date |
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KR101744370B1 (en) | 2017-06-07 |
TWI460351B (en) | 2014-11-11 |
KR20130099917A (en) | 2013-09-06 |
TW201211392A (en) | 2012-03-16 |
JP5210363B2 (en) | 2013-06-12 |
JP2012041837A (en) | 2012-03-01 |
CH705559B1 (en) | 2016-10-14 |
CN103069164A (en) | 2013-04-24 |
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