JP2011185247A - Water-filling type scroll air compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-filling type scroll air compressor capable of preventing any rust of components, any short-circuit of electric apparatuses or the like caused by water leaked from a seal part of a dust lap. <P>SOLUTION: The scroll air compressor includes a turning scroll member having a lap, a pair of fixed scroll members 25 each having a lap 25b substantially engaged with the lap to form a plurality of operating chambers and a dust lap 25c arranged on its outer circumferential side, and a water supply system for filling water to cooling air intake ports and cooling air discharge ports and a suction system formed on upper and lower surfaces of the fixed scroll members. The scroll air compressor further includes a water drain hole formed in a lower part of the dust lap 25c to drain water in a lap outer circumferential chamber B, and a water guide pipe 39B for guiding water drained from the water drain hole to a lower side suction path 25h. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a double-tooth scroll air compressor, and more particularly to a water injection scroll air compressor that injects water into a working chamber of a compression main body or an intake passage on the upstream side thereof.

  The double-tooth scroll air compressor has a orbiting scroll member having spiral wraps erected on the one side and the opposite side of the end plate part, and one side and the other side of the orbiting scroll member. A spiral wrap that is arranged and fastened to each other to form a casing that houses the orbiting scroll member and that substantially meshes with the wrap on one side and the opposite side of the orbiting scroll member to form a plurality of working chambers, respectively. A pair of fixed scroll members. Each of the crankshafts is rotatably supported by the casing and has a crank portion connected to the outer peripheral portion of the orbiting scroll member, and includes a plurality of crankshafts that swing (turn) the orbiting scroll member. As the orbiting scroll member revolves, the working chamber moves spirally from the outer peripheral portion toward the central portion, and the volume is reduced to compress the air.

  Conventionally, in such a double-tooth scroll air compressor, a cooling flow path (in the end plate portion of the orbiting scroll member (cooling channel) is provided for the purpose of cooling the discharge portion of the compressed air that becomes the highest temperature, that is, the central portion of the orbiting scroll member. Specifically, a structure has been proposed in which a plurality of ventilation holes penetrating in the vertical direction are formed and the cooling air is circulated through the cooling flow path (see, for example, Patent Document 1). In the prior art described in Patent Document 1, a cooling air intake (suction port) and a cooling air exhaust port (exhaust port) are formed on the upper and lower surfaces of the casing, and the cooling air is introduced into the casing from the cooling air intake. After the intake and circulation to the cooling flow path of the orbiting scroll member, it is discharged from the cooling air discharge port. In addition, an annular dust wrap is provided on the outer peripheral side of the wrap of the fixed scroll member to prevent dust from entering the working chamber together with the cooling air. Grooves are formed in the respective front end surfaces of the wrapping scroll member wrap, the fixed scroll member wrap and the dust wrap, and a sealing material is inserted into these grooves.

  As a double-tooth type scroll air compressor, a water injection type in which water is injected into the working chamber or an intake passage upstream of the working chamber is known (for example, see Patent Document 2). This water injection has the effect of sealing a small gap between members forming a plurality of working chambers, and the action of absorbing the compression heat to prevent thermal deformation of each member and suppressing the expansion of the gap described above. Bring. As a result, the leakage of air from the working chamber is reduced and the efficiency is increased.

Japanese Patent Laid-Open No. 10-246189 (FIG. 3, FIG. 4, FIG. 6, etc.) JP-A-8-128395 (FIG. 10 etc.)

  Assuming the case where the water injection type is adopted for the double-tooth scroll air compressor described in Patent Document 1, there is room for improvement as follows. That is, for example, when configured to inject water into the intake path, a part of the water not taken into the working chamber from the intake path is formed on the outer peripheral side of the wrap of the fixed scroll member and the inner peripheral side of the dust lap. Accumulated in the generated space (hereinafter referred to as a lap outer peripheral space). In addition, even when water is directly injected into the working chamber, for example, a part of the water is returned from the working chamber to the suction side due to the pressure gradient between the discharge-side working chamber and the suction-side working chamber, so that the outer periphery of the wrap Accumulate in space. Then, water flows downward from the contact surface (seal surface) or a slight gap between the sealing material at the tip of the dust trap of the fixed scroll member and the end plate portion of the orbiting scroll member, and flows out to the outside through the cooling air discharge port. . Therefore, there is a possibility of rusting parts and the like arranged on the lower side of the compressor body. In addition, when an electric device such as a motor is disposed on the lower side of the compressor body, there is a possibility that the electric device may have a defect such as an insulation failure or a short circuit.

  The present invention has been made in view of the above-described matters, and its purpose is to provide a water-injecting scroll that can prevent rusting of parts, short-circuiting of electrical equipment, and the like due to water leakage from the seal portion of the dust wrap. It is to provide a compressor.

  (1) In order to achieve the above object, the present invention provides a orbiting scroll member having spiral wraps erected on the one side and the opposite side of the end plate part, and one side of the orbiting scroll member. The casings are arranged on the side and the opposite side and fastened to each other to form the casing for storing the orbiting scroll member, and are substantially meshed with the side wraps on one side and the opposite side of the orbiting scroll member, respectively. A pair of fixed scroll members each having a spiral wrap to be formed and an annular dust trap disposed on the outer periphery thereof, and rotatably supported by the casing and connected to the outer periphery of the orbiting scroll member A plurality of crankshafts each having a crank portion and swinging the orbiting scroll member; A cooling air inlet and a cooling air outlet that are respectively formed on the lower surface and communicate with the outer peripheral side space of the dust lap in the casing, and take in and discharge the cooling air into the outer peripheral space of the dust lap in the casing. And a vent hole formed in the end plate portion of the orbiting scroll member, through which cooling air taken into the outer space of the dust wrap in the casing flows, and water in the intake chamber on the upstream side or the working chamber. A scroll air compressor comprising: water injection means for injecting water; and a water separator tank provided in an air discharge path downstream of the working chamber and separating water contained in the compressed air discharged from the working chamber. A wrap outer peripheral chamber formed in the lower part of the dust lap and formed on the outer peripheral side of the wrap of the fixed scroll member and on the inner peripheral side of the dust lap. Comprising a drainage hole for discharging the accumulated water, which is connected to the water drainage hole, said draining the intake path the discharged water from the pores, the water guide pipe system which led to the outside of the nausea pathway or compressor unit.

  (2) In the above (1), preferably, a pump is provided in the water conduit system for pumping water.

  (3) In the above (2), preferably, the water conduit system leads water discharged from the drain hole to the intake path, and is provided on the upstream side of the pump in the water conduit system. A tank for storing water discharged from the drain hole, a water level detecting means for detecting a water level in the tank, and a pump control means for driving and controlling the pump according to the water level detected by the water level detecting means. Prepare.

  (4) In the above (1), preferably, the water conduit system guides water discharged from the drain hole to the intake path, and the intake path is connected to the intake path by a difference in height position of an inlet / outlet. It is configured to be able to derive water, and is provided in the water conduit system and stores water discharged from the water drain hole, water level detection means for detecting the water level in the tank, and the water conduit system in the water conduit system. An opening / closing valve provided on the downstream side of the tank; and an opening / closing valve control means for controlling opening / closing of the opening / closing valve in accordance with a water level detected by the water level detection means.

  (5) In the above (1), preferably, the water conduit system leads the water discharged from the drain hole to the exhalation path, and is provided in the exhalation path by a drop in the height position of an entrance / exit. A tank configured to be able to lead out water, provided in the water conduit system, for storing water discharged from the drain hole, and a check valve provided on the downstream side of the tank in the water conduit system; Prepare.

  (6) In the above (1), preferably, the water conduit system leads the water discharged from the water drain hole to the exhalation path, and is provided in the exhalation path by a difference in height position of an entrance / exit. Water is configured to be led out, provided in the water conduit system, a tank for storing water discharged from the drain hole, an on-off valve provided on the downstream side of the tank in the water conduit system, A pressure detecting means for detecting a pressure at a specific part of the exhalation path, which is a derivation destination of the water conduit system, and the opening and closing when the pressure detected by the pressure detecting means is equal to or less than a preset threshold value of atmospheric pressure. And an open / close valve control means for controlling the open / close valve to a closed state when the valve is controlled to open and the pressure detected by the pressure detection means exceeds the threshold.

  (7) In the above (2), preferably, the water conduit system is configured to lead water discharged from the drain hole to the discharge path, and is provided on the upstream side of the pump in the water conduit system. A tank for storing the water discharged from the drain hole, a pressure detecting means for detecting the pressure at a specific part of the exhalation path from which the water conduit system is led out, and a pressure detected by the pressure detecting means in advance And a pump control means for driving the pump when the pressure is less than or equal to a set atmospheric pressure threshold and stopping the pump when the pressure detected by the pressure detection means exceeds the threshold.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that the rusting of components, the short circuit of an electric equipment, etc. arise by the water leak from the seal part of a dust lap.

It is a systematic diagram showing the structure of the water injection | pouring scroll air compressor in the 1st Embodiment of this invention. It is a perspective view showing the whole compressor main part structure in a 1st embodiment of the present invention. It is a horizontal sectional view showing detailed structure of a compressor main part in a 1st embodiment of the present invention. FIG. 4 is a vertical sectional view taken along section IV-IV in FIG. 3. It is a figure showing the water conduit system in the 1st Embodiment of this invention with the structure of a fixed scroll member. It is a figure showing the water conduit system in the 2nd Embodiment of this invention with the structure of a fixed scroll member. It is a figure showing the water conduit system in the 3rd Embodiment of this invention with the structure of a fixed scroll member. . It is a figure showing the water conduit system in the 4th Embodiment of this invention with the structure of a fixed scroll member.

  A first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a system diagram showing a configuration of a water injection scroll air compressor in the present embodiment.

  In FIG. 1, a water injection type scroll air compressor includes a compressor body 1 that compresses air, a suction piping system 2 provided on the suction side (intake side) of the compressor body 1, and a compressor body 1. And a discharge piping system 3 provided on the discharge side (exhaust side). Moreover, the motor (electric motor) 4 which drives a compressor main body, and the control panel 5 which controls apparatuses, such as the motor 4, are provided.

  An intake filter 6 is provided in the intake piping system 2. Note that the piping on the downstream side of the intake filter 6 is configured to branch to intake ports 24e, 24f, 25e, and 25f of the compressor body 1 to be described later, although details are not shown.

  The discharge piping system 3 includes a compressor main body check valve 7, an after cooler (cooler) 8, a water separator tank 9, a pressure holding check valve 10, and a dryer (dehumidifier) in the order of the flow direction of compressed air. 11 is provided. Further, a relief valve 12 is provided between the water separator tank 9 and the holding pressure check valve 10 in the discharge piping system 3. The upstream pipe of the compressor main body check valve 7 is configured to merge from discharge ports 24i and 25i of the compressor main body 1 to be described later, although details are not shown.

  An air discharge piping system 13A is branched and connected to the upstream side of the check valve 7 for the compressor body in the discharge piping system 3 (specifically, downstream of the junction where the discharge ports 24i and 25i of the compressor body 1 merge). The air discharge piping system 13A is provided with a water separator 14A and an air discharge control valve 15A (solenoid valve). In addition, an air discharge piping system 13B is branchedly connected between the water separator tank 9 and the pressure-holding check valve 10 in the discharge piping system 3, and the water separator 14B and the air discharge are connected to the air discharge piping system 13B. A control valve 15B (electromagnetic valve) is provided. In addition, since the compressed gas introduce | transduced from the discharge piping system 3 is comparatively high temperature, 13 A of discharge piping systems are arrange | positioned so that it may be cooled using the exhaust air of the aftercooler 8. FIG.

  Further, a pressure sensor 16A and a temperature sensor 17A for detecting the pressure and temperature downstream of the holding pressure check valve 10 in the discharge piping system 3 are provided, and the pressure and temperature upstream of the check valve 7 in the discharge piping system 3 are provided. A pressure sensor 16 </ b> B and a temperature sensor 17 </ b> B for detecting the above are provided, and their detection signals are output to the control panel 5.

  The water separator tank 9 has a double cylinder structure consisting of an outer cylinder and an inner cylinder in the upper space, and the compressed air from the after cooler 9 is introduced into the flow path between the outer cylinder and the inner cylinder and swirled. Compressed air and water contained therein are primarily separated by the difference in specific gravity, and the separated water is stored in the lower space. Further, the separated compressed air is introduced into the flow path inside the inner cylinder, and the remaining water contained in the compressed air is secondarily separated by the water separator element 18.

  The water stored in the lower space of the water separator tank 9 is supplied by the pressure in the tank 9 via the water supply piping system 19 (water injection means) to the suction piping system 2 (specifically, a plurality of suction ports of the compressor body 1). To the upstream of the branching point that branches into In the water supply piping system 19, a strainer 20, a water filter 21, and a water injection control valve 22 (electromagnetic valve) are provided in the order of the water flow direction.

  Here, in this embodiment, since the aftercooler 8 is provided on the upstream side of the water separator tank 9 as described above, for example, when the compressor body 1 is stopped, water is not left in the working chamber of the compressor body 1. For this purpose, it is possible to perform a non-poured water operation (dry operation). More specifically, when the non-water injection operation is performed (specifically, when the compressor main body 1 is operated while the water injection control valve 22 is closed and the water injection to the suction piping system 2 is stopped), from the compressor main body 1 Compressed air immediately after discharge is as high as 200 ° C. or higher, and if it is introduced into the water separator tank 9 as it is, a problem arises. Therefore, if an aftercooler 8 is provided upstream of the water separator tank 9 to cool the compressed air, the problem can be solved. Therefore, it is possible to perform a non-poured water operation.

The control panel 5 switches the operation mode according to the operation of an operation switch and a stop switch (not shown), the pressure P detected by the pressure sensor 16A, and the like. That is, in the control panel 5, as a control range of the pressure P, a target pressure P _M , an upper limit pressure P _U (> P _M ), and a lower limit pressure P _D (<P _M ) are set and stored in advance. For example, when the operation switch is operated, the load operation mode is first executed. In this load operation mode, the water injection control valve 22 is opened and water is injected into the suction piping system 2 (as a result, water is injected into the working chamber of the compressor body 1). Further, the motor 4 is driven while the air release control valves 14A and 14B are closed, and the compressor main body 1 is loaded. At this time, it performs PID calculation based on the deviation between the pressure P and the target pressure P _M detected by the pressure sensor 16A, variably controls the rotational speed of the motor 4 via an inverter (not shown) on the basis of this calculated value. Thus, the pressure P detected by the pressure sensor 16A is substantially the same as the target pressure P _M.

However, when the amount of compressed air used at the supply destination is significantly reduced, the pressure P detected by the pressure sensor 16A increases even if the rotational speed of the motor 4 is kept to a minimum value. Then, for example, when the pressure P reaches the upper limit pressure P _U is adapted to switch to the no-load operating mode. In this no-load operation mode, as in the load operation mode, the water injection control valve 22 is opened and water is injected into the suction piping system 2. Further, the compressor main body 1 is operated without load while the rotation speed of the motor 4 is suppressed to the minimum value while the air release valve control valves 14A and 14B are opened.

The judges, in no-load operation mode, the pressure P detected by the pressure sensor 16A is whether reduced to the lower limit pressure P _D. For example, if reduced pressure P to the lower limit pressure P _D, switch to load operation mode. On the other hand, for example, if the pressure P is reduced to the lower limit pressure P _D, continues idling mode, if the duration has elapsed the predetermined time set in advance, so that the switch to sleep mode. In this pause mode, the water injection control valve 22 is closed and water injection to the suction piping system 2 is stopped. Further, the compressor body 1 is stopped by stopping the motor 4 while opening the release valve control valves 14A and 14B. Further, in sleep mode, if reduced pressure P to the lower limit pressure P _D, switch to load operation mode.

The amount of water injected into the suction piping system 2 in the load operation mode and the no-load operation mode is controlled by the opening degree of the water injection control valve 22. That is, the control panel 5 calculates the water injection amount so that the temperature detected by the temperature sensor 17B falls within a predetermined target range set in advance, and controls the opening degree of the water injection control valve 22 correspondingly. It has become. At this time, the volume ratio of the water injection flow rate based on the intake flow rate is, for example, about 5 × 10 ⁻⁵ to 40 × 10 ⁻⁵ .

  For example, when the stop switch is operated, before the compressor main body 1 is stopped, the above-described no-load operation mode is executed, and further, the pressure detected by the pressure sensor 16B is equal to or lower than a predetermined pressure set in advance. If it decreases, the non-poured water operation (dry operation) mode is executed. In this non-water-injection operation mode, the injection control valve 22 is closed and water injection into the suction piping system 2 is stopped. Further, the compressor main body 1 is operated without load while the rotation speed of the motor 4 is suppressed to the minimum value while the air release valve control valves 14A and 14B are opened. And after performing non-water-filling operation mode for a fixed time, the motor 4 is stopped and the compressor main body 1 is stopped. This prevents water from remaining in the working chamber of the compressor body 1 when stopped.

  The compressor body 1, the suction piping system 2, the discharge piping system 3, the motor 4, the control panel 5, the discharge piping systems 13 </ b> A and 13 </ b> B, the water supply piping system 19, and the like are packaged in a casing (not shown). It constitutes a compressor unit.

  Next, the structure of the compressor body 1 that is a main part of the present embodiment will be described. FIG. 2 is a perspective view showing the overall structure of the compressor body 1 (however, a view showing a state in which a main crankshaft 26, an auxiliary crankshaft 27 and the like which will be described later are removed). FIG. 3 is a horizontal sectional view showing the detailed structure of the compressor body 1, and FIG. 4 is a vertical sectional view of the section in FIG. FIG. 5 is a view showing the water conduit system together with the structure of the fixed scroll member 25 described later (however, a side view of the fixed scroll member 25 viewed from the inside).

  2 to 5, the compressor main body 1 is a double-tooth scroll compressor, and is approximately on the side one side (left side in FIG. 3) side surface and the opposite side (right side in FIG. 3) side surface of the end plate portion 23a. The orbiting scroll member 23 provided with the spiral wraps 23b and 23c, and the spiral wrap 24b disposed on the side surface of the orbiting scroll member 23 on the inner side (right side in FIG. 3). And a fixed scroll member 25 which is disposed on the opposite side of the orbiting scroll member 23 and has a spiral wrap 25b standing on the inner side surface (left side in FIG. 3) of the end plate portion 25a. The fixed scroll members 24 and 25 are fastened to each other to constitute a casing that houses the orbiting scroll member 23. The wrap 23b of the orbiting scroll member 23 and the wrap 24b of the fixed scroll member 24 are substantially meshed to form a plurality of working chambers, and the wrap 23c of the orbiting scroll member 23 and the wrap 25b of the fixed scroll member 25 are approximately meshed. A plurality of working chambers are formed.

  The compressor body 1 includes a main crankshaft 26 and a sub crankshaft 27 that swing (turn) the orbiting scroll member 23. The main crankshaft 26 is rotatably supported by bearings 28A and 29A provided on the fixed scroll members 24 and 25, and the sub crankshaft 27 is rotatably supported by bearings 28B and 29B provided on the fixed scroll members 24 and 25. Has been. The main crankshaft 26 and the sub crankshaft 27 have shaft end portions protruding from the fixed scroll member 24, and pulleys 30A and 30B are provided on these shaft end portions. A timing belt 31 is mounted on the pulleys 30A and 30B so that the main crankshaft 26 and the sub-crankshaft 27 rotate synchronously. A V pulley 32 is provided at the shaft end of the main crankshaft 26. As shown in FIG. 1 above, a V belt 34 is mounted between the V pulley 32 and the V pulley 33 provided on the rotation shaft of the motor 4, and the rotational power of the motor 4 is applied to the main crankshaft 26. It is to be transmitted.

  The main crankshaft 26 has a crank portion 26a connected to one side (lower side in FIG. 3) of the outer peripheral portion of the orbiting scroll member 23 via a bearing 35A. A crank portion 27a is connected to the other side of the outer peripheral portion (upper side in FIG. 3) via a bearing 35B. The crank portion 26a of the main crankshaft 26 and the crank portion 27a of the auxiliary crankshaft 27 are eccentric from the axis by the same amount of eccentricity to form a parallel four-bar link mechanism. Thereby, the turning scroll member 23 is pivotally supported so that turning is possible. In order to cancel the unbalance due to the orbiting motion of the orbiting scroll member 23, the main crankshaft 26 is provided with balance weights 36A and 36B, and the auxiliary crankshaft 26 is provided with balance weights 37A and 37B. .

  The orbiting scroll member 23 includes the end plate portion 23a, the wraps 23b and 23c, a communication hole 23d provided in the central portion of the end plate portion 23a and communicating with the working chambers in the discharge process on one side and the opposite side. A plurality of ventilation holes 23e (4 rows × 2 rows in the present embodiment) provided through the portion 23a in the vertical direction are provided.

  The fixed scroll member 25 includes the end plate portion 25a, the wrap 25b, an annular dust strap 25c erected on the outer peripheral side of the wrap 25b on the inner side surface of the end plate portion 25a, and the outer side of the end plate portion 25a (FIG. 2). A plurality of radiating fins 25d are provided which are erected on the side surface in the middle upper side and the right side in FIG. Further, an upper suction port 25e (see FIG. 2 and FIG. 5, the right side in FIG. 3, the lower side in FIG. 4, the left side in FIG. 4) formed on the outer side surface of the end plate portion 25a and sandwiching the entire radiation fin 25d. 5) and a lower suction port 25f (see FIG. 5) located on the opposite side (left side in FIGS. 2 and 5, upper side in FIG. 3, right side in FIG. 4). Further, in the space B on the outer peripheral side of the wrap 25b and the inner peripheral side of the dust wrap 25c (hereinafter referred to as the wrap outer peripheral space B), in the vicinity of the outer peripheral side end portion of the wrap 23c of the orbiting scroll member 23 (on the upper left side in FIG. 4) The upper suction passage 25g (see FIG. 5) formed so as to communicate the region, the upper right side region in FIG. 5 and the upper suction port 25e, and the vicinity of the outer peripheral side end portion of the wrap 25b in the wrap outer peripheral space B ( 4 has a lower suction passage 25h (see FIG. 5) that communicates with the lower suction port 25f. Moreover, it has the discharge outlet 25i formed in the center part of the end plate part 25a.

  Then, between the orbiting scroll member 23 and the fixed scroll member 25, air is mainly sucked in from the upper suction port 25e and the upper suction passage 25g and compressed in accordance with the orbiting motion of the orbiting scroll member 23, from the discharge port 25i. A compression path to be discharged (specifically, a plurality of working chambers formed so as to be adjacent to the inner side in the radial direction of the wrap 23c of the orbiting scroll member 23 and moving spirally toward the discharge port 25i) is formed, A compression path for sucking and compressing air mainly from the lower suction port 25f and the lower suction passage 25h and discharging it from the discharge port 25i (specifically, adjacent to the radially outer side of the wrap 23c of the orbiting scroll member 23). Thus, a plurality of working chambers moving in a spiral toward the discharge port 25i are formed.

  Similarly to the fixed scroll member 25, the fixed scroll member 24 includes the end plate portion 24a, the wrap 24b, an annular dust strap 24c erected on the outer peripheral side of the wrap 24b on the inner side surface of the end plate portion 24a, and an end plate It has a plurality of radiating fins 24d that are erected on the outer side (lower side in FIG. 2, left side in FIG. 3) of the portion 24a and extend in the vertical direction. Further, the upper suction port 24e (see FIG. 2) is formed on the outer side surface of the end plate portion 24a and is located on one side (the right side in FIG. 2, the lower side in FIG. 3, the left side in FIG. 4) across the entire radiation fin 24d. And a lower suction port 24f (see FIG. 2) located on the opposite side (left side in FIG. 2, upper side in FIG. 3, right side in FIG. 4). Although not shown in the drawings, the vicinity of the outer peripheral side end of the wrap 23b of the orbiting scroll member 23 and the upper suction side in the space A on the outer peripheral side of the wrap 24b and the inner peripheral side of the lap strap 24c (hereinafter referred to as the wrap outer peripheral space A). An upper suction passage 24g formed so as to communicate with the port 24e, and a lower suction passage 24h communicating with the lower suction port 24f in the vicinity of the outer peripheral side end of the wrap 24b in the wrap outer circumferential space A. ing. Moreover, it has the discharge outlet 24i formed in the center part of the end plate part 24a.

  Then, between the orbiting scroll member 23 and the fixed scroll member 24, air is mainly sucked in from the upper suction port 24e and the upper suction passage 24g and compressed in accordance with the orbiting motion of the orbiting scroll member 23, from the discharge port 24i. A discharge path (specifically, a plurality of working chambers formed so as to be adjacent to the inner side in the radial direction of the wrap 23b of the orbiting scroll member 23 and moving in a spiral toward the discharge port 24i) is formed. A compression path for sucking and compressing air mainly from the lower suction port 24f and the lower suction passage 24h and discharging from the discharge port 24i (specifically, adjacent to the radially outer side of the wrap 23b of the orbiting scroll member 23). As the orbiting scroll member 23 turns, a plurality of working chambers that move spirally toward the discharge port 24i are formed.

  In addition, grooves are formed on the respective front end surfaces of the wraps 23b and 23c of the orbiting scroll member 23, the wrap 24b and the dust lap 23c of the fixed scroll member 24, and the wrap 25b and the dust wrap 25c of the fixed scroll member 25. A sealing material is inserted in the groove.

  In addition, a plurality of (four in this embodiment) cooling air inlets 38A are formed on the upper surface of the fixed scroll member 24 constituting the casing, and a plurality of (four in this embodiment) cooling air outlets are formed on the lower surface. 38B is formed, and the cooling air intake port 38A and the cooling air discharge port 38B communicate with the outer space of the dust wraps 24c and 25c in the casing. Then, as indicated by the dotted line arrow in FIG. 4, the cooling air generated by a cooling fan (not shown) or the like is taken into the casing from the cooling air intake port 38 </ b> A and circulated through the ventilation holes 23 e of the orbiting scroll member 23. Thereafter, the air is discharged from the cooling air discharge port 38B. As a result, the central portion of the orbiting scroll member 23 is cooled. At this time, as described above, the annular dust wrap 24c is provided on the outer peripheral side of the wrap 24b of the fixed scroll member 24 and the annular dust wrap 25c is provided on the outer peripheral side of the wrap 25b of the fixed scroll member 25. At the same time, dust is prevented from entering the working chamber.

  Here, in this embodiment, as described above, water is injected into the suction piping system 2 via the water supply piping system 19. Therefore, a part of the water that has not been taken into the working chamber from the suction passages 24g and 24h of the fixed scroll member 24 and the pressure gradient between the discharge-side working chamber and the suction-side working chamber returned to the suction side from the working chamber. A part of the water collects in the wrap outer circumferential space A. Further, the water is returned from the working chamber to the suction side due to a part of the water that has not been taken into the working chamber from the suction paths 25g and 25h of the fixed scroll member 25 and the pressure gradient between the discharge-side working chamber and the suction-side working chamber. A part of the water accumulates in the wrap outer peripheral space B. A contact surface (seal surface) or a slight gap between the sealing material at the tip of the dust wrap 24 c of the fixed scroll member 24 and the sealing material at the tip of the dust wrap 25 c of the fixed scroll member 25 and the end plate portion 23 a of the orbiting scroll member 23. Then, the water may flow downward and flow out to the outside through the cooling air discharge port 38B.

  Therefore, as a major feature of this embodiment, as shown in FIG. 5, the lower portion of the dust wrap 25c of the fixed scroll member 25 (specifically, it is spaced apart from the opening of the lower suction passage 25h in the dust wrap 25c). On the side), a water drain hole 25k for discharging water accumulated in the lap outer peripheral space B is formed. Further, a water conduit 39B is provided which is connected to the water drain hole 25k and guides water discharged from the water drain hole 25k to the lower suction passage 25h. While the compressor main body 1 is in operation, the lap outer peripheral space B is almost atmospheric pressure, whereas the lower suction passage 25h is negative pressure, so that the pressure difference between them is a loss head (details) of the conduit pipe 39B. In this case, the water accumulated in the wrap outer peripheral space B is led to the suction passage 25h through the drain hole 25k and the water conduit 39B.

  Further, although not shown, similarly, there is a lap outer peripheral space below the dust wrap 24c of the fixed scroll member 24 (specifically, below the opening of the lower suction passage 24h in the dust wrap 24c). A water drain hole 24k for discharging water accumulated in A is formed. Further, a water guide pipe 39A is provided which is connected to the water drain hole 24k and leads the water discharged from the water drain hole 24k to the lower suction passage 24h. During the operation of the compressor body, the lap outer circumferential space A is almost atmospheric pressure, whereas the lower suction passage 24h is negative pressure, so that the pressure difference exceeds the loss head of the water conduit 39A. The water stored in the wrap outer circumferential space A is led to the suction passage 24h through the water drain hole 24k and the water guide pipe 39A. Note that the amount of water led out from the water conduits 39A and 39B is very small relative to the amount of water supplied from the water supply piping system 19.

  In the present embodiment configured as described above, the water accumulated in the outer circumferential spaces A and B of the wrap is led out to the lower suction passages 24h and 25h, so that water leakage from the seal portions of the dust wraps 24c and 25c can be suppressed. it can. Therefore, rusting of parts arranged on the lower side of the compressor main body 1 due to water leakage from the seal portions of the dust wraps 24c and 25c, a short circuit of an electric device arranged on the lower side of the compressor main body 1, and the like occur. Can be prevented.

  In the first embodiment, the case where no suction throttle valve is provided in the suction piping system 2 has been described as an example. However, the present invention is not limited to this. That is, control is performed in conjunction with the air release control valves 15A and 15B (more specifically, when the air release control valves 15A and 15B are closed, the air release control valves 15A and 15B are opened, and the air release control valves 15A and 15B are opened. In this case, a suction throttle valve may be provided in the suction piping system 2 so that the water supply piping system 19 supplies water downstream of the suction throttle valve. Moreover, in the said 1st Embodiment, although the water supply piping system 19 demonstrated as an example the case where water was inject | poured into the suction piping system 2 (in other words, intake route), it is not restricted to this. That is, for example, it may be configured to inject directly into the working chamber of the compressor body 1. In the first embodiment, the case where the cooling air is taken in from the cooling air inlet 38A on the upper surface of the compressor body 1 and the cooling air is discharged from the cooling air outlet 38B on the lower surface is described as an example. However, the present invention is not limited thereto, and cooling air may be taken in from the cooling air intake port on the lower surface, and the cooling air may be discharged from the cooling air discharge port on the upper surface.

  Next, a second embodiment of the present invention will be described. This embodiment is an embodiment provided with a water conduit system that leads water discharged from the drain hole of the dust wrap of the compressor body to the suction pipe system. In addition, the same code | symbol is attached | subjected to the part equivalent to the said 1st Embodiment etc., and description is abbreviate | omitted suitably.

  FIG. 6 is a diagram illustrating the water conduit system in the present embodiment together with the structure of the fixed scroll member 25.

  In the present embodiment, a water conduit system 40 is provided for leading water discharged from the water drain hole 24k of the dust lap 24c and the water drain hole 25k of the dust wrap 25c of the compressor body 1 to the suction pipe system 2. In the present embodiment, the connection portion (not shown) with the suction piping system 2, in particular, the water conduit piping system 40 in the suction piping system 2 is arranged above the compressor body 1.

  The conduit pipe system 40 includes a conduit pipe 41A connected to the drain hole 25k of the dust wrap 25c, a conduit pipe 41B connected to the drain hole 24k (not shown) of the dust wrap 24c, and the conduit pipes 41A and 41B. A tank 42 for storing water discharged from the drain hole 24k of the dust lap 24c and the drain hole 25k of the dust wrap 25c, a lower portion of the tank 42, and the suction piping system 2 (specifically, the suction of the compressor body 1) A water conduit 43 connected to the outlets 24e, 24f, 25e, and 25f) and a pump 44 that is interposed in the water conduit 43 and pumps water.

  Further, for example, an electrostatic capacity type water level sensor 45 (water level detecting means) for detecting the water level in the tank 42 and outputting the detection signal to the control panel 5 is provided. The control panel 5 has a pump control function (pump control means) for driving and controlling the pump 44 in accordance with the water level detected by the water level sensor 45. Specifically, for example, a predetermined upper limit water level and a lower limit water level are set and stored in advance as a control range of the water level in the tank 42, and the pump 44 when the water level detected by the water level sensor 45 rises to a predetermined upper limit water level. And the pump 44 is stopped when the water level detected by the water level sensor 45 falls to a predetermined lower limit water level.

  In the present embodiment configured as described above, the water accumulated in the wrap outer peripheral spaces A and B is led out to the suction piping system 2, and therefore, from the seal portions of the dust wraps 24 c and 25 c as in the first embodiment. Water leakage can be suppressed. Therefore, rusting of parts arranged on the lower side of the compressor main body 1 due to water leakage from the seal portions of the dust wraps 24c and 25c, a short circuit of an electric device arranged on the lower side of the compressor main body 1, and the like occur. Can be prevented.

  Moreover, in this embodiment, since the water conduit system 40 has led out the water to the upstream of the branch point of the suction piping system 2, the following effects are acquired. That is, as in the first embodiment, when water is led out only to the lower suction passages 24h and 25h among the upper suction passages 24g and 25g and the lower suction passages 24h and 25h, the upper suction passages 24g and 25g. And the lower suction passages 24h and 25h (in other words, the compression path for mainly sucking and compressing air from the upper suction port 24e and the upper suction passage 24g and discharging it from the discharge port 24i, and the upper suction port 25e and the upper suction passage 24g. A compression path for sucking and compressing air from the suction passage 25g and discharging it from the discharge port 25i, and a compression path for sucking and compressing air mainly from the lower suction port 24f and the lower suction passage 24h and discharging from the discharge port 24i In addition, the amount of water injection is slightly increased (with a compression path mainly for sucking and compressing air from the lower suction port 25f and the lower suction passage 25h and discharging from the discharge port 25i). Lance occurs. On the other hand, in this embodiment, since water is led out to the upstream side of the branch point of the suction piping system 2, the water injection amount can be balanced.

  In the second embodiment, a tank 42 provided in the water conduit system 40, a water level sensor 45 for detecting the water level in the tank 42, and a downstream side of the tank 42 in the water conduit system 40 are provided. However, the present invention is not limited to this. That is, for example, if the pump 44 capable of idling is used, the tank 42 and the water level sensor 45 are not provided (in other words, the water conduits 41A and 41B join together to the water conduit 43 instead of the tank 42). It is good also as a structure to connect. Even in such a modification, the same effect as described above can be obtained.

  Moreover, in the said 2nd Embodiment and its modification, the connection part with the suction piping system 2, especially the water conduit piping system 40 in the suction piping system 2 is arrange | positioned above the compressor main body 1. As an example, the case where the pump 44 is provided in the water conduit system 40 has been described as an example, but the present invention is not limited thereto. That is, for example, if the connection portion with the suction piping system 2, in particular, the water conduit piping system 40 in the suction piping system 2 is arranged below the compressor body 1, the water conduit piping system 40 is connected to the pump 44. You may comprise so that water may be guide | induced by the fall of the height position of an entrance / exit, without providing. As a specific example, although not shown, an on-off valve is provided instead of the pump 44 of the second embodiment, and the water level in the tank 42 detected by the water level sensor 45 rises to a predetermined upper limit water level. Alternatively, the on-off valve may be opened, and the on-off valve may be closed when the water level in the tank 42 detected by the water level sensor 45 falls to a predetermined lower limit water level. In such a case, the same effect as described above can be obtained.

  Next, a third embodiment of the present invention will be described. The present embodiment is an embodiment in which a water conduit piping system for leading water discharged from the drain hole of the dust wrap of the compressor main body to a discharge piping system is provided, and a tank and a check valve are provided in the water conduit piping system. In addition, the same code | symbol is attached | subjected to the part equivalent to the said 1st and 2nd embodiment etc., and description is abbreviate | omitted suitably.

  FIG. 7 is a diagram illustrating the water conduit system in the present embodiment together with the structure of the fixed scroll member 25.

  In the present embodiment, there is provided a conduit pipe system 46 for leading water discharged from the drain hole 24k of the dust lap 24c of the compressor body 1 and the drain hole 25k of the dust wrap 25c to the water separator tank 9 of the discharge pipe system 2. Yes. In the present embodiment, the connection portion of the water separator tank 9, particularly, the water conduit tank 46 in the water separator tank 9 is disposed below the compressor body 1.

  The water conduit system 46 is configured to lead out water by a drop in the height position of the entrance and exit, and the water conduit 41A connected to the water drain hole 25k of the dust wrap 25c and the water drain hole 24k (see FIG. A tank 42 connected to the water pipes 41A and 41B and storing water discharged from the water drain hole 24k of the dust lap 24c and the water drain hole 25k of the dust wrap 25c, and the tank 42 A water conduit 47 connected between the lower portion of the water separator tank 9 and the water separator tank 9 and a check valve 48 interposed in the water conduit 47 are provided.

  The check valve 48 prevents back flow from the water separator tank 9 side to the tank 42 side, and when the pressure of the water separator tank 9 is reduced to about atmospheric pressure, the water depth head on the tank 42 side causes water to flow from the tank 42 side. Water is led out to the separator tank 9 side.

  In the present embodiment configured as described above, the water accumulated in the wrap outer peripheral spaces A and B is led to the water separator tank 9, so that the seals of the dust wraps 24c and 25c are the same as in the first and second embodiments. Water leakage from the part can be suppressed. Therefore, rusting of parts arranged on the lower side of the compressor main body 1 due to water leakage from the seal portions of the dust wraps 24c and 25c, a short circuit of an electric device arranged on the lower side of the compressor main body 1, and the like occur. Can be prevented.

  Next, a fourth embodiment of the present invention will be described with reference to FIG. The present embodiment is an embodiment in which a water conduit piping system for leading water discharged from the drain hole of the dust wrap of the compressor body to a discharge piping system is provided, and a tank and an on-off valve are provided in this water conduit piping system. Note that portions equivalent to those in the third embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  FIG. 8 is a diagram illustrating the water conduit system in the present embodiment together with the structure of the fixed scroll member 25.

  In this embodiment, the conduit pipe system 46 ′ is provided with an on-off valve 49 (electromagnetic valve) instead of the check valve 48. Further, a pressure sensor 50 (pressure detection means) for detecting the pressure in the water separator tank 9 and outputting the detection signal to the control panel 5 is provided. The control panel 5 has an open / close valve control function (open / close valve control means) that controls the open / close valve 49 according to the pressure detected by the pressure sensor 50. Specifically, for example, a predetermined threshold value of about atmospheric pressure is set and stored in advance, and when the pressure detected by the pressure sensor 50 is equal to or lower than the predetermined threshold value, the on-off valve 49 is opened, and the pressure sensor 50 When the detected pressure exceeds a predetermined threshold value, the on-off valve 49 is controlled to be closed.

  Also in the present embodiment configured as described above, the water accumulated in the wrap outer peripheral spaces A and B is led out to the water separator tank 9 as in the third embodiment. Water leakage can be suppressed. Therefore, rusting of parts arranged on the lower side of the compressor main body 1 due to water leakage from the seal portions of the dust wraps 24c and 25c, a short circuit of an electric device arranged on the lower side of the compressor main body 1, and the like occur. Can be prevented.

  In the third or fourth embodiment, the connection portion with the water separator tank 9, in particular, the water conduit system 46 or 46 ′ in the water separator tank 9 is arranged below the compressor body 1. However, the present invention is not limited to this, although the water conduit system 46 or 46 ′ is described as an example in which the pump is not provided and water is led out by the height difference of the entrance and exit. That is, for example, if the connection portion of the water separator tank 9, particularly the water conduit pipe system in the water separator tank 9, is disposed above the compressor body 1, the check valve 48 or the on-off valve 49 is used. A pump may be provided. The pump is driven when the pressure detected by the pressure sensor 50 is equal to or lower than a predetermined threshold, and the pump is stopped when the pressure detected by the pressure sensor 50 exceeds the predetermined threshold. Also good. For example, if a pump capable of idling is used, the tank 42 is not provided (in other words, instead of the tank 42, the water conduits 41 </ b> A and 41 </ b> B merge and connect to the water conduit 47. Structure). In these modified examples, the same effect as described above can be obtained.

  Further, in the third and fourth embodiments and the modifications thereof, the water guide piping systems 46 and 46 ′ have been described by taking as an example the case where water is led to the water separator tank 9 of the discharge piping system 3. Not limited to. That is, for example, water may be led to the upstream side of the water separator tank 9 in the discharge piping system 3. In this case, the same effect as described above can be obtained. Further, for example, water may be led to the downstream side of the water separator tank 9 in the discharge piping system 3, but in this case, injected water (specifically, water accumulated in the water separator tank 9, The total amount of water circulated between the tank 9 and the compressor body 1 is reduced.

  Further, in the first and second embodiments, the water discharged from the drain hole 24k of the dust lap 24c and the drain hole 25k of the dust wrap 25c of the compressor body 1 is supplied to the intake path (specifically, the lower side The case where a water guide piping system leading to the intake passages 24h, 25h or the suction piping system 2) is provided will be described as an example. In the third and fourth embodiments, the water in the dust wrap 24c of the compressor main body 1 is described. A case where a water guide pipe system for leading water discharged from the hole 24k and the water drain hole 25k of the dust wrap 25c to the discharge path (specifically, the discharge pipe system 3, preferably the water separator tank or its upstream side) is provided. Although described as an example, it is not limited to these. That is, for example, a water conduit system (not shown) for leading water discharged from the drain hole 24k of the dust lap 24c and the drain hole 25k of the dust wrap 25c of the compressor body 1 to the outside of the compressor unit may be provided. . Also in this case, rusting of parts arranged on the lower side of the compressor main body 1 due to water leakage from the seal portions of the dust wraps 24c and 25c, a short circuit of an electric device arranged on the lower side of the compressor main body 1, etc. Can be prevented. Moreover, although injection water reduces, it can be set as a simple structure.

2 Intake piping system (intake route)
3 Discharge piping system (exhaust path)
5 Control panel 9 Water separator tank 19 Water supply system (water injection means)
23 orbiting scroll member 23a end plate portion 23b wrap 23c wrap 23e vent hole 24 fixed scroll member 24b wrap 24c dust wrap 24e upper suction port (intake path)
24f Lower inlet (intake path)
24g Upper intake passage (intake route)
24h Lower intake passage (intake route)
24i Nausea (Nausea Path)
24k Drain hole 25 Fixed scroll member 25b Wrap 25c Dust strap 25e Upper suction port (intake route)
25f Lower inlet (intake path)
25g Upper intake passage (intake route)
25h Lower intake passage (intake route)
25i Nausea (Nausea Path)
25k Water drain hole 26 Main crankshaft 26a Crank part 27 Sub crankshaft 27a Crank part 38A Cooling air intake 38B Cooling air outlet 39A Water guide pipe 39B Water guide pipe 40 Water guide pipe system 42 Tank 44 Pump 45 Water level sensor (water level detecting means)
46 Water transfer piping system 48 Check valve 49 On-off valve 50 Pressure sensor (pressure detection means)

Claims (7)

An orbiting scroll member having spiral wraps erected on the side one side and the opposite side of the end plate part,
The revolving scroll member is disposed on one side and the opposite side of the orbiting scroll member, and is fastened to each other to form a casing that houses the orbiting scroll member. A pair of fixed scroll members each having a helical wrap and a ring-shaped dust trap disposed on the outer periphery thereof, which are substantially meshed to form a plurality of working chambers;
A plurality of crankshafts that are rotatably supported by the casing and each have a crank portion connected to an outer peripheral portion of the orbiting scroll member, and swing the orbiting scroll member;
A cooling air intake that is formed on the upper surface and the lower surface of the casing, communicates with the outer space of the dust lap in the casing, and takes in and discharges the cooling air into the outer space of the dust wrap in the casing. And a cooling air outlet,
A ventilation hole formed in the end plate portion of the orbiting scroll member, through which cooling air taken into the outer space of the dust wrap in the casing flows,
Water injection means for injecting water into the working chamber or an intake passage upstream thereof;
In a scroll air compressor provided with a water separator tank that is provided in an exhalation path on the downstream side of the working chamber and separates water contained in the compressed air discharged from the working chamber,
A drain hole formed in a lower portion of the dust wrap for discharging water accumulated in a wrap outer peripheral chamber formed on an outer peripheral side of the wrap of the fixed scroll member and an inner peripheral side of the dust wrap;
Water-injected scroll air, comprising: a water conduit system connected to the drain hole and for leading water discharged from the drain hole to the outside of the intake path, the exhaust path, or the compressor unit Compressor.   The water injection type scroll air compressor according to claim 1, further comprising a pump provided in the water conduit system for pumping water. The water injection type scroll air compressor according to claim 2, wherein the water conduit system leads water discharged from the drain hole to the intake passage.
A tank that is provided on the upstream side of the pump in the water conduit system, and stores water discharged from the drain hole;
Water level detection means for detecting the water level in the tank;
A water injection type scroll air compressor comprising pump control means for driving and controlling the pump according to the water level detected by the water level detection means. 2. The water injection type scroll air compressor according to claim 1, wherein the conduit pipe system guides water discharged from the water drain hole to the intake path, and the intake air is driven by a difference in height position of an inlet / outlet. It is configured so that water can be led to the route,
A tank provided in the water conduit system for storing water discharged from the drain hole;
Water level detection means for detecting the water level in the tank;
An on-off valve provided on the downstream side of the tank in the water conduit system;
A water injection type scroll air compressor comprising: on / off valve control means for controlling opening / closing of the on / off valve according to the water level detected by the water level detecting means. 2. The water injection scroll air compressor according to claim 1, wherein the conduit pipe system is configured to lead water discharged from the drain hole to the discharge path, and the discharge gas is generated by a difference in a height position of an inlet / outlet. It is configured so that water can be led to the route,
A tank provided in the water conduit system for storing water discharged from the drain hole;
A water injection type scroll air compressor comprising: a check valve provided on the downstream side of the tank in the water conduit system. 2. The water injection scroll air compressor according to claim 1, wherein the conduit pipe system is configured to lead water discharged from the drain hole to the discharge path, and the discharge gas is generated by a difference in a height position of an inlet / outlet. It is configured so that water can be led to the route,
A tank provided in the water conduit system for storing water discharged from the drain hole;
An on-off valve provided on the downstream side of the tank in the water conduit system;
Pressure detecting means for detecting the pressure of a specific part of the exhalation path which is a destination of the water conduit system;
When the pressure detected by the pressure detection means is less than or equal to a preset threshold value of about atmospheric pressure, the open / close valve is controlled to open, and when the pressure detected by the pressure detection means exceeds the threshold, An on / off valve control means for controlling the on / off valve to a closed state is provided. The water injection type scroll air compressor according to claim 2, wherein the water conduit system leads water discharged from the drain hole to the air discharge path.
A tank that is provided on the upstream side of the pump in the water conduit system, and stores water discharged from the drain hole;
Pressure detecting means for detecting the pressure of a specific part of the exhalation path which is a destination of the water conduit system;
When the pressure detected by the pressure detection means is less than or equal to a preset threshold value of atmospheric pressure, the pump is driven, and when the pressure detected by the pressure detection means exceeds the threshold, the pump is stopped. A water injection type scroll air compressor characterized by comprising a pump control means.

Images