JP4709016B2 - Complex compressor - Google Patents

Description

  The present invention relates to a composite compressor in which compressed gas discharged from an upstream compressor is further compressed by a downstream compressor and discharged.

In a composite compressor, a turbo compressor is used as an upstream compressor, and a positive displacement compressor (for example, a reciprocating compressor, a scroll compressor, etc.) is used as a downstream compressor, and the compressor is compressed by a turbo compressor. The primary compressed gas is sent to the positive displacement compressor, and the primary compressed gas is further compressed by the positive displacement compressor to discharge a high-pressure secondary compressed gas (see, for example, Patent Document 1).
Japanese Patent No. 2703319

  However, in the conventional composite compressor, the upstream compressor is a turbo compressor that discharges a large amount of low-pressure compressed gas, and a positive displacement compressor that sucks a large amount of primary compressed gas discharged from the turbo compressor However, since a large size is used, there are problems such as an increase in size and an increase in power load.

  The object of the present invention is to solve the problems in the conventional composite compressor as described above, and the specific means thereof are as described in the claims and are as follows. .

According to the present invention, the above problem is solved as follows.
(1) In a composite compressor in which compressed gas discharged from an upstream compressor is further compressed and discharged by a downstream compressor, the upstream compressor is a scroll compressor, and the downstream compression The reciprocating compressor is a reciprocating compressor, and the primary compressed gas discharged from the discharge port of the scroll compressor is sent to the suction port of the reciprocating compressor and further compressed by the reciprocating compressor. A secondary compressed gas is discharged from an outlet , the first compressed gas is sent to the suction port of the reciprocating compressor and the reciprocating compressor bypasses the discharge. A switching valve capable of switching to a second flow path to be sent downstream from the outlet, and when the switching valve opens the first flow path and closes the second flow path, the scroll compressor and the reciprocation Each power source of the compressor is operated, and A control device that controls to operate the power source of the scroll compressor and stop the power source of the reciprocating compressor when the valve valve closes the suction first flow path and opens the second flow path; Ru equipped with.

(2) In the above item (1), the switching valve is based on a measurement value of a pressure sensor that measures a pressure in a tank that stores the secondary compressed gas discharged from the discharge port of the reciprocating compressor. And can be switched .

(3) In the above item (1) or (2) , the primary compressed gas discharged from the discharge port of the scroll compressor is used in a sealed crankcase of the reciprocating compressor, the switching valve, The first flow path is passed through in order and introduced into the suction port of the reciprocating compressor .

(4) In the composite compressor in which the compressed gas discharged from the upstream compressor is further compressed and discharged by the downstream compressor, the upstream compressor is a scroll compressor, and the downstream compression The reciprocating compressor is a reciprocating compressor, and the primary compressed gas discharged from the discharge port of the scroll compressor is sent to the suction port of the reciprocating compressor and further compressed by the reciprocating compressor. A secondary compressed gas is discharged from an outlet, and a part of the primary compressed gas is introduced into a sealed crankcase in the reciprocating compressor .

(5) In the above item (4) , the scroll compressor and the reciprocating compressor are driven by a single power source .

(6) In any one of the above items (1) to (5), the scroll compressor and the reciprocating compressor are assembled together .

According to the present invention, the following effects can be obtained.
(A) According to the first aspect of the present invention, the upstream compressor is a scroll compressor that has excellent sound and vibration performance and can be easily downsized, and the downstream compressor has a simple structure. In addition, since the reciprocating compressor is optimal for obtaining a high pressure, it is possible to reduce the size and reduce the power load, and to obtain a high-pressure secondary compressed gas efficiently.
Furthermore, by switching the switching valve, a low-pressure one-compressed gas and a high-pressure secondary-compressed gas can be selectively obtained as necessary. In particular, when a low-pressure primary compressed gas is required, the reciprocating compressor is stopped and only the scroll compressor is driven, so that quietness and power load can be reduced.

(B) According to the invention described in claim 2 , the switching valve is provided on the tank based on the measured value of the pressure sensor for measuring the pressure in the tank for storing the secondary compressed gas discharged from the discharge port of the reciprocating compressor. It is possible to automatically switch to the first flow path for sending the low-pressure primary compressed gas or the second flow path for sending the high-pressure secondary compressed gas.

(C) According to the invention described in claim 3, by introducing the primary compressed gas into the crankcase and reducing the pressure difference between the compressed gas in the crankcase and the compressed gas in the cylinder, a large pressure difference It is possible to prevent early damage to each operating part associated with the above and to reduce the size of the reciprocating compressor.

(D) According to the invention described in claim 4, the upstream compressor is a scroll compressor that has excellent performance in sound and vibration and can be easily downsized, and the downstream compressor has a simple structure. In addition, since the reciprocating compressor is optimal for obtaining a high pressure, it is possible to reduce the size and reduce the power load, and to obtain a high-pressure secondary compressed gas efficiently.
In addition, by introducing a part of the primary compressed gas into the crankcase and reducing the pressure difference between the compressed gas in the crankcase and the compressed gas in the cylinder, early operation of each working part due to a large pressure difference is achieved. While being able to suppress damage, it is possible to reduce the size of the reciprocating compressor.

(E) According to the invention described in claim 5, since the scroll compressor and the reciprocating compressor are driven by a single power source, it is possible to reduce the size and the cost.

(F) According to the invention described in claim 6 , the composite compressor can be further downsized by integrally assembling the scroll compressor and the reciprocating compressor.

  FIG. 1 is a conceptual diagram of a composite compressor according to the present invention, FIG. 2 is a longitudinal sectional view of a composite compressor illustrating Example 1 of the present invention, and FIG. 3 is a composite illustrating Example 2 of the present invention. It is a longitudinal cross-sectional view of a compressor. In the following description, the left side in FIGS. 2 and 3 is “front”, and the right side is “rear”.

  As shown in FIG. 1, the composite compressor of the present invention employs a scroll compressor (1) excellent in quietness and energy saving as an upstream compressor, and has a simple structure as a downstream compressor. In addition, a reciprocating compressor (2) that can easily obtain high pressure is adopted, and the primary compressed gas (A) compressed by the scroll compressor (1) is sent to the reciprocating compressor (2). The primary compressed gas (A) is further compressed by the reciprocating compressor (2), and the high-pressure secondary compressed gas (B) is discharged. The secondary compressed gas (B) discharged from the reciprocating compressor (2) is sent to a tank (3) for storing compressed gas provided on the downstream side of the reciprocating compressor (2).

  The composite compressor of Example 1 shown in FIG. 2 fixes the front part of the crankcase (22) in the reciprocating compressor (2) to the rear part of the cylindrical housing (11) in the scroll compressor (1). At the same time, a single motor (4) is attached to the rear part of the crankcase (22) so as to be integrally formed. The motor (4) serves as a power source for simultaneously driving the scroll compressor (1) and the reciprocating compressor (2).

  The scroll compressor (1) is engaged with the fixed wrap (13) formed in an involute curve in the hermetically sealed housing (11) and the fixed wrap (13) in mesh with each other in a state of being shifted 180 degrees. It has a swirl wrap (15) forming 16).

  The fixed wrap (13) is erected on the rear surface of the fixed end plate (12) of the housing (11), and the swivel wrap (15) is a swivel plate (14) rotatably supported in the housing (11). ) Standing up front.

  The revolving plate (14) is inserted through the center of the lid (a part of the crankcase (22) of the reciprocating compressor (2)) (24) that closes the rear surface of the housing (11), and the motor (4). It is pivotally supported by the eccentric shaft portion (42) of the drive shaft (41) that is rotated with the rotation of the drive shaft (41), and a lid through three known pin crank type anti-rotation mechanisms (17) arranged on the same circumference. It is linked to the body (24) and performs an eccentric revolving motion as the drive shaft (41) rotates.

  The outer peripheral portion and the central portion of the fixed end plate (12) of the housing (11) are respectively provided with a scroll suction port (111) and a compression chamber (16) for sucking external gas into the compression chamber (16). A scroll discharge port (112) for discharging the compressed primary compressed gas (A) is provided.

  When the revolving plate (14) performs an eccentric revolving motion by driving the motor (4), the volume of the compression chamber (16) partitioned by the fixed wrap (13) and the revolving wrap (15) is increased from the outer periphery. It gradually decreases toward the inner circumference. Thus, the external gas sucked from the scroll intake port (111) is gradually compressed toward the inner periphery, and the compressed primary compressed gas (A) is discharged from the scroll discharge port (112). The primary compressed gas (A) discharged from the scroll discharge port (112) is sent to the reciprocating compressor (2), and a part thereof is introduced into the crankcase (22) of the reciprocating compressor (1). Is done.

  The reciprocating compressor (2) has a piston (23) that reciprocates in a cylindrical cylinder (21) to repeat intake and discharge. The upper part of the cylinder (21) is for scrolling. Cylinder suction port (25) for introducing primary compressed gas (A) discharged from discharge port (112) into cylinder (21) and secondary compressed gas (B) compressed in cylinder (21) A cylinder discharge port (26) for discharging the gas is provided.

  The piston (23) is reciprocated in the cylinder (21) via the piston rod (27) by a crankshaft (43) integrated with a drive shaft (41) driven by a motor (4).

  A crankcase suction port (221) for sucking a portion of the primary compressed gas (A) discharged from the scroll discharge port (112) into the crankcase (22) is provided above the crankcase (22). Is provided.

  When the piston (23) in the cylinder (21) reciprocates, the primary compressed gas (A) passes from the cylinder suction port (25) to the upper side of the piston (23) in the cylinder (21) through the suction valve (28). After introduction and further compression, high pressure secondary compressed gas (B) is discharged from the cylinder discharge port (26) through the discharge valve (29) and sent to the tank (3).

  During the reciprocating motion of the piston (23), a part of the primary compressed gas (A) discharged from the scroll discharge port (112) of the scroll compressor (1) is introduced into the crankcase (22). The inside of the crankcase (22) is pressurized to atmospheric pressure or higher. Therefore, the difference between the pressure of the compressed gas in the compression chamber above the piston (23) in the cylinder (21) and the pressure of the compressed gas in the crankcase (22) is about atmospheric pressure in the crankcase (22). Smaller than that of As a result, when the pressure difference between the top and bottom of the piston (23) is large, a sudden and powerful downward force acts on the piston (23), and the outer peripheral surface of the piston (23) and the piston ring as well as each pivot and seal There is a possibility that an excessive and uneven force is applied to the part, leading to the cause of early failure, but in this example, the cause of early failure is eliminated because the pressure difference between the top and bottom of the piston (23) is small. Thus, a small and high-pressure compressed gas can be discharged efficiently.

  As described above, in the first embodiment, the low-pressure primary compressed gas (A) compressed by the scroll compressor (1), which is excellent in terms of quietness and energy saving, has a simple structure and a high pressure easily. Since the reciprocating compressor (2) that can be obtained is further compressed to discharge the high-pressure secondary compressed gas (B), the high-pressure compressed gas can be obtained efficiently. Further, since the scroll compressor (1) and the reciprocating compressor (2) can be driven simultaneously with a single motor (4), it is possible to reduce the size and the cost. Furthermore, as described above, a part of the primary compressed gas (A) discharged from the scroll discharge port (112) of the scroll compressor (1) is introduced into the crankcase (22). The reciprocating compressor (2) can be reduced in size and improved in quietness.

  In the composite compressor of the second embodiment shown in FIG. 3, the scroll compressor (1) and the reciprocating compressor (2) are provided with motors (4) and (5), respectively, which are dedicated power sources, and sucrose. A switching valve (6) is provided in the middle of the flow path for sending the primary compressed gas (A) compressed by the compressor (1) to the cylinder inlet (25) of the reciprocating compressor (2). Although the basic configuration is the same although there are some differences from the first embodiment, the same reference numerals as those in the first embodiment are given to portions having the same functions, and detailed description thereof is omitted.

  A motor (5) for driving the scroll compressor (1) is attached to the front of a sealed cylindrical housing (11).

  The swivel plate (14) having the swirl wrap (15) passes through the central portion of the lid (18) of the housing (11) and is rotated by the motor (5) with the eccentric shaft portion (52) of the drive shaft (51). ) And linked with the lid (18) via the pin crank type anti-rotation mechanism (17), and performs an eccentric revolving motion as the drive shaft (51) rotates.

  The upper part of the housing (11) and the central part of the fixed end plate (12) are compressed by the scroll suction port (111A) and the compression chamber (16) for sucking external gas into the compression chamber (16), respectively. A scroll discharge port (112A) is provided for discharging the primary compressed gas (A) and introducing it into the crankcase (22) of the reciprocating compressor (2).

  The primary compressed gas (A) discharged from the scroll discharge port (112A) passes through the through hole (44) provided in the axial direction on the tip side of the drive shaft (41) on the motor (4) side. And is introduced into the crankcase (22).

  A crank for discharging the primary compressed gas (A) introduced into the crankcase (22) to the cylinder suction port (25) of the reciprocating compressor (2) is provided at the upper part of the crankcase (22). A case discharge port (222) is provided.

  The switching valve (6) is provided in the middle of the flow path connecting the crankcase discharge port (222) and the cylinder suction port (25), and the primary compressed gas discharged from the crankcase discharge port (222). The first flow path (9) for sending (A) to the cylinder suction port (25) and the second flow path (10 for bypassing the reciprocating compressor (2) and sending it to the downstream side of the cylinder discharge port (26) (10) ).

  Switching of the switching valve (6) and driving / stopping control of the motors (4) and (5) are performed by a control device (7) having an electric circuit. In addition, a pressure sensor (8) for measuring the pressure in the tank (3) is provided downstream of the cylinder discharge port (26). Information such as the measurement value of the pressure sensor (8) is transmitted to the control device (7). The control device (7) stops and controls the motors (4) and (5) when the amount of compressed gas consumed in the tank (3) decreases and the amount of compressed gas sent to the tank (3) increases.

  When a high-pressure secondary compressed gas (B) is required, a changeover switch (not shown) of the control device (7) is changed over to the high-pressure side. As a result, the first flow path (9) of the switching valve (6) is opened and the second flow path (10) is closed, and the motors (4) and (5) are driven almost simultaneously.

  As a result, the scroll compressor (1) and the reciprocating compressor (2) are operated together, and the primary compressed gas (A) compressed by the scroll compressor (1) is discharged into the scroll discharge port (112A). And is introduced into the crankcase (22) through the through hole (44), and further discharged from the crankcase discharge port (222) through the crankcase (22).

  Further, the primary compressed gas (A) discharged from the crankcase discharge port (222) is sent to the cylinder intake port (25) via the switching valve (6) and the first flow path (9), and is supplied to the cylinder. Introduced in (21). As a result, the high-pressure secondary compressed gas (B) is discharged from the cylinder discharge port (26).

  When the low pressure primary compressed gas (A) is required, the changeover switch of the control device (7) is switched to the low pressure side. As a result, the solenoid (61) of the switching valve (6) is excited, the first flow path (9) of the switching valve (6) is closed and the second flow path (10) is opened, and only the motor (5) is turned on. To drive. As a result, only the scroll compressor (1) operates, and the primary compressed gas (A) compressed by the scroll compressor (1) passes through the scroll discharge port (112A) and the through hole (44). Are introduced into the crankcase (22) and discharged from the crankcase discharge port (222) through the crankcase (22). The primary compressed gas (A) discharged from the crankcase discharge port (222) is not sent to the cylinder intake port (25), but passes through the switching valve (6) and the second flow path (10). The low-pressure primary compressed gas (A) is sent to the downstream side of the cylinder discharge port (26).

  As described above, Example 1 can efficiently obtain a high-pressure secondary compressed gas as in Example 1, and reciprocating primary compressed gas (A) compressed by the scroll compressor (1). Since the compressor (2) is introduced into the crankcase (22), the reciprocating compressor (2) can be reduced in size and improved in quietness. Further, by switching the switching valve (6), it is possible to selectively obtain a low-pressure single compressed gas (A) and a high-pressure secondary compressed gas (B) as required. Especially when low pressure primary compressed gas (A) is required, the reciprocating compressor (2) is stopped and only the scroll compressor (1) is driven. Can be planned.

The embodiments of the present invention have been described above. However, the following modifications and changes can be made to the embodiments without departing from the gist of the present invention.
(I) In Example 1, the primary compressed gas (A) compressed and discharged by the scroll compressor (1) is transferred to the crankcase (22) of the reciprocating compressor (2) as in Example 2. Introduce directly. The primary compressed gas (A) introduced into the crankcase (22) is discharged from the crankcase (22) and sent to the cylinder suction port (25).

(Ii) In the second embodiment, the primary compressed gas (A) compressed and discharged by the scroll compressor (1) is partially a crankcase of the reciprocating compressor (2) as in the first embodiment. Introduce to (22).

(Iii) In Example 2, the switching valve (6) is provided in the tank (3) for storing the secondary compressed gas (B) discharged from the cylinder discharge port (26) of the reciprocating compressor (2). Based on the measured value of the pressure sensor (8) for measuring the pressure, for example, when the pressure sensor (8) has measured a pressure value greater than or equal to a predetermined value, the first channel (9) is closed and the second channel (10) And the first flow path (9) is opened and the second flow path (10) is closed based on the pressure sensor (8) measuring the pressure below a predetermined value.

It is a conceptual diagram of the composite compressor concerning this invention. 1 is a longitudinal sectional view of a composite compressor illustrating Example 1 of the present invention. It is a longitudinal cross-sectional view of the composite compressor which illustrates Example 2 of this invention.

(1) Scroll compressor (upstream compressor)
(2) Reciprocating compressor (downstream compressor)
(3) Tank
(4) Motor (power source)
(5) Motor (power source)
(6) Switching valve
(7) Control device
(8) Pressure sensor
(9) First flow path
(10) Second flow path
(11) Housing
(12) Fixed end plate
(13) Fixed wrap
(14) Swivel plate
(15) Swivel lap
(16) Compression chamber
(17) Pin crank type rotation prevention mechanism
(18) Lid
(21) Cylinder
(22) Crank case
(23) Piston
(24) Lid
(25) Cylinder inlet
(26) Cylinder outlet
(27) Piston rod
(28) Suction valve
(29) Discharge valve
(41) Drive shaft
(42) Eccentric shaft
(43) Crankshaft
(44) Through hole
(51) Drive shaft
(52) Eccentric shaft
(61) Solenoid
(111) (111A) Scroll inlet
(112) (112A) Scroll outlet
(221) Crankcase inlet
(222) Discharge port for crankcase

Claims (6)

In the composite compressor in which the compressed gas discharged from the upstream compressor is further compressed and discharged by the downstream compressor,
The upstream compressor is a scroll compressor, the downstream compressor is a reciprocating compressor, and primary compressed gas discharged from a discharge port of the scroll compressor is sucked into the reciprocating compressor. It is sent to the mouth, further compressed by the reciprocating compressor, and discharged from the outlet through the secondary compressed gas ,
Switching capable of switching between a first flow path for sending the primary compressed gas to the suction port of the reciprocating compressor and a second flow path for bypassing the reciprocating compressor and sending it downstream from the discharge port And when the switching valve opens the first flow path and closes the second flow path, each power source of the scroll compressor and the reciprocating compressor is operated, and the switching valve A control device that controls to operate the power source of the scroll compressor and stop the power source of the reciprocating compressor when the first suction channel is closed and the second channel is opened. A composite compressor characterized by that. The switching valve is switched based on a measurement value of a pressure sensor that measures a pressure in a tank that stores the secondary compressed gas discharged from the discharge port of the reciprocating compressor. The composite compressor according to 1. The reciprocating compressor passes the primary compressed gas discharged from the discharge port of the scroll compressor in the sealed crankcase of the reciprocating compressor, the switching valve, and the first flow path in this order. The composite compressor according to claim 1 or 2 , wherein the compressor is introduced into the suction port . In the composite compressor in which the compressed gas discharged from the upstream compressor is further compressed and discharged by the downstream compressor,
The upstream compressor is a scroll compressor, the downstream compressor is a reciprocating compressor, and primary compressed gas discharged from a discharge port of the scroll compressor is sucked into the reciprocating compressor. It is sent to the mouth, further compressed by the reciprocating compressor, and discharged from the outlet through the secondary compressed gas,
A composite compressor characterized in that a part of the primary compressed gas is introduced into a closed crankcase in the reciprocating compressor. 5. The composite compressor according to claim 4, wherein the scroll compressor and the reciprocating compressor are driven by a single power source . 6. The composite compressor according to claim 1, wherein the scroll compressor and the reciprocating compressor are integrally assembled .

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