JP4516151B2 - Reciprocating compressor - Google Patents

Description

  The present invention relates to a reciprocating compressor suitably used for compressing a gas such as air, and more particularly to a reciprocating compressor having a configuration in which cylinders are arranged in a horizontal direction.

  Generally, a reciprocating air compressor as a reciprocating compressor includes a crankcase, a cylinder that is attached to the crankcase and in which a piston is removably inserted, and a piston that is provided at the tip of the cylinder. And a valve seat member having a suction port and a discharge port that open to the compression chamber, a suction valve provided in the valve seat member for opening and closing the suction port, and the valve seat A discharge valve that opens and closes the discharge port provided in the member, a suction chamber that is provided on the distal end side of the valve seat member and communicates with the suction port, and a discharge chamber that communicates with the discharge port are defined. The cylinder head is generally constituted.

  In some reciprocating compressors, cylinders are inclined and arranged, for example, a low-pressure side cylinder and a high-pressure side cylinder are arranged in a V shape so as to rise upward and incline from the horizontal direction. There is a stepped V-type reciprocating compressor (see, for example, Patent Document 1).

  In this two-stage V-type reciprocating compressor, the cylinder head of the high-pressure side cylinder is arranged so that the suction port is located on the upper side and the discharge port is located on the lower side. Along with the arrangement of the suction port and the discharge port, the inside of the cylinder head is defined by an upper suction chamber and a lower discharge chamber by partition walls extending in the left and right directions in the horizontal direction.

  The two-stage V-type reciprocating compressor according to Patent Document 1 compresses the sucked air by reciprocating the piston in the low pressure side cylinder, and the compressed air is sucked from the suction port of the high pressure side cylinder. To supply. As a result, the high pressure side cylinder reciprocates the piston, sucks compressed air into the compression chamber while opening the suction valve, and further compresses this compressed air to open the discharge valve and discharge it into the discharge chamber. Then, high-pressure compressed air is supplied to the tank through a pipe connected to the discharge port.

  Here, when the compression operation is stopped, high-pressure compressed air remains in the discharge chamber or the like. And this compressed air condenses by cooling and generates drainage. At this time, since the cylinder head has the discharge port disposed on the lower side, the drain generated in the discharge chamber can move toward the discharge port and be discharged from the discharge port to the piping side.

  On the other hand, another reciprocating compressor is a two-stage horizontally opposed reciprocating compressor in which two cylinders are opposed to each other while being arranged in the horizontal direction (see, for example, Patent Document 2).

  In this two-stage horizontally opposed type reciprocating compressor, two cylinders are disposed facing each other in the horizontal direction across a crankcase, and each cylinder is provided with a cylinder head. The cylinder head is provided with a suction port for sucking air and a discharge port for discharging compressed air when the piston reciprocates in the cylinder. The suction port communicates with the suction chamber, and the discharge chamber discharges It communicates with the room.

JP 2000-359662 A JP 11-2108080 A

  By the way, in the horizontally opposed reciprocating compressor of Patent Document 2, by arranging the cylinder in the horizontal direction, there is no space on the lower side of the cylinder head, and piping cannot be connected from the lower side of the cylinder head. Discharge ports are provided at the left and right positions of the pipes, and piping is connected to the discharge ports.

  However, when the discharge ports are provided at the left and right positions of the cylinder head, the drain in the discharge chamber cannot be moved toward the discharge port, so that the drain remains in the discharge chamber. As a result, rust is generated in the discharge valve and the like, and the airtightness when the valve is closed may be impaired, and there is a problem that the compression efficiency is lowered.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a drain generated in a discharge chamber even when discharge ports are provided at the left and right positions of a cylinder head arranged in a horizontal direction. Is to provide a reciprocating compressor capable of discharging the gas from the discharge port.

A reciprocating compressor according to the present invention includes a crankcase, a cylinder attached to the crankcase and disposed in a state extending in a horizontal direction from the crankcase, a compression section that compresses air, and the compression section A tank for storing air compressed by the motor, a motor case, a rotating shaft disposed in the motor case, a stator fixed in the motor case, and the rotation located on the inner peripheral side of the stator A motor unit mounted in the crankcase, a piston connected to a rotating shaft of the motor unit and removably inserted in the cylinder, and the cylinder A valve seat member provided at an end opposite to the side of the crankcase and having a suction port and a discharge port defining a compression chamber between the piston and the compression chamber; A suction valve provided on the valve seat member for opening and closing the suction port; a discharge valve provided on the valve seat member for opening and closing the discharge port; and a side of the valve seat member opposite to the side on which the compression chamber is located A suction chamber that is communicated with the suction port and a discharge chamber that is capable of communicating with the discharge port; a peripheral wall surface surrounding the discharge chamber from above, below, left, and right; A closed surface that closes the peripheral wall surface, and a discharge port that is provided to open to one peripheral wall surface portion located in the left or right direction of the peripheral wall surface. enclose the direction, and a cylinder head which is formed as an inclined wall inclined downwardly to the peripheral wall portion disposed on the lower side toward the discharge port than the discharge port of the valve seat member.

In the invention of claim 2, the discharge port of the cylinder head, Ru Tei and configuration of providing open the the one wall surface in corner positions of the inclined wall surface.
According to a third aspect of the present invention, a lightening portion is formed below the peripheral wall surface portion of the peripheral surface of the cylinder head surrounding the discharge port from below.

  According to the first aspect of the present invention, when the compression operation is stopped, the compressed air remaining in the discharge chamber is cooled and condensed to generate drainage. At this time, the cylinder head is formed with an inclined wall surface inclined downward toward the discharge port, with the peripheral wall portion positioned on the lower side of the peripheral wall surface surrounding the discharge chamber from the upper, lower, left, and right directions. ing. Accordingly, the drain generated in the discharge chamber moves to the discharge port along the inclined wall surface, and can be sequentially discharged from the discharge port to an external pipe or the like.

  Thereby, for example, even when the cylinder is arranged in the horizontal direction and there is no space around it, the drain generated in the discharge chamber can be discharged even when the discharge port has to be provided at the left and right positions of the cylinder head. . As a result, it is possible to prevent rusting of the discharge valve due to residual drain and to maintain good airtightness when the discharge valve is closed over a long period of time. Reliability and the like can be improved.

  According to the second aspect of the present invention, since the discharge port is provided at an angular corner position between the one wall portion located in the left and right direction of the cylinder head and the inclined wall surface, the drain flowing along the inclined wall surface is provided. Can be guided to the discharge port, and the drain can be efficiently discharged from the discharge port.

1 is an external perspective view showing a two-stage horizontally opposed reciprocating air compressor applied to a first embodiment of the present invention. FIG. It is a front view which shows the reciprocating air compressor of FIG. 1 from the upper side in the state which removed the cover member of the casing. It is a principal part expanded sectional view which expands and shows the reciprocating air compressor in FIG. 2 from arrow III-III direction. It is the enlarged view which looked at the compressor main body from the arrow IV-IV direction in FIG. It is the principal part expanded sectional view which looked at the high pressure side cylinder of the compression part from the arrow VV direction in FIG. It is sectional drawing which looked at the high pressure side cylinder from the arrow VI-VI direction in FIG. It is a top view which shows a valve seat member, a suction valve, and a discharge valve. It is sectional drawing of the cylinder head seen from the arrow VIII-VIII direction in FIG. It is sectional drawing of the cylinder head seen from the arrow IX-IX direction in FIG. It is sectional drawing which shows the low voltage | pressure side cylinder by the 2nd Embodiment of this invention. It is sectional drawing which looked at the cylinder head from the same position as FIG. It is sectional drawing which looked at the cylinder head by the modification of this invention from the same position as FIG.

  Hereinafter, as a reciprocating compressor according to an embodiment of the present invention, a two-stage horizontally opposed reciprocating air compressor will be described as an example and described in detail with reference to the accompanying drawings.

  First, FIG. 1 thru | or FIG. 9 has shown 1st Embodiment. In FIG. 1, reference numeral 1 denotes a two-stage horizontally opposed reciprocating air compressor that constitutes a reciprocating compressor applied to the first embodiment.

  Since this air compressor 1 is formed thin so that it can be suspended and transported with one hand, the built-in compressor body 7 to be described later has two stages capable of obtaining thin and high-pressure compressed air. A horizontally opposed compressor of the type is used. The reciprocating air compressor 1 is roughly constituted by a casing 2, a tank 3, a control device 6, a compressor main body 7, and the like which will be described later.

  Reference numeral 2 denotes a casing forming the outer shape of the reciprocating air compressor 1, and the casing 2 accommodates a tank 3, a control device 6, a compressor main body 7, and the like, which will be described later, as shown in FIG. The casing 2 is formed as a box-shaped container by attaching the lower base member 2A and the upper cover member 2B facing each other. Further, a handle 2 </ b> C that is gripped during transportation is provided on the rear side of the casing 2. Here, the casing 2 has a shape close to the tank 3 and the compressor main body 7 in order to form the reciprocating air compressor 1 in a thin shape.

  Next, reference numeral 3 denotes a tank accommodated on the front side in the casing 2. The tank 3 stores compressed air discharged from the compression unit 10 of the compressor body 7, and is formed as a substantially cylindrical sealed container from a metal material, for example. Further, the tank 3 is disposed horizontally so as to extend in the left and right directions, and is attached to the bottom of the base member 2A via a vibration isolating rubber 3A as shown in FIG. The tank 3 is connected to a discharge pipe 28 of the compression unit 10 described later.

  Further, as shown in FIG. 2, a low pressure air pressure regulator 4 comprising a dial type pressure reducing valve 4A, a pressure gauge 4B and a hose coupling 4C is attached to the left side of the tank 3. On the right side of the tank 3, a high pressure air pressure regulator 5 including a dial type pressure reducing valve 5A, a pressure gauge 5B, and a hose coupling 5C is attached.

  Reference numeral 6 denotes a control device disposed between the tank 3 and a motor unit 8 of the compressor main body 7 which will be described later. The control device 6 is attached to the rear side of the tank 3. The control device 6 controls the motor unit 8.

  Reference numeral 7 denotes a compressor body housed on the rear side in the casing 2. The compressor body 7 supplies compressed air toward the tank 3. As shown in FIGS. 3 and 4, the compressor body 7 is roughly configured by a motor unit 8, a cooling fan 9, and a compression unit 10 which will be described later.

  Reference numeral 8 denotes a motor unit disposed on the right side of the compressor body 7, and the motor unit 8 is attached to a crankcase 11 of the compression unit 10 described later. The motor unit 8 is rotated by being supplied with power from the control device 6 and drives the compression unit 10. The motor unit 8 includes a cylindrical motor case 8A facing the crankcase 11 on the same axis, a rotating shaft 8B extending in the left and right directions at the center of the motor case 8A, and the motor case 8A And a rotor (none of which is shown) positioned on the inner peripheral side of the stator and fixed to the rotating shaft 8B.

  Here, the rotating shaft 8 </ b> B of the motor unit 8 protrudes into the crankcase 11 of the compression unit 10 at one end side to constitute a crankshaft. On the other hand, the other end side of the rotating shaft 8B protrudes to the right side of the motor case 8A, and a cooling fan 9 for supplying cooling air to the motor unit 8 and the compression unit 10 is attached to the protruding end.

  Next, reference numeral 10 denotes a compression unit of the compressor main body 7 constituting the reciprocating compressor according to the present embodiment. The compression unit 10 is a horizontally opposed reciprocating air compressor that compresses air in two stages by attaching a low pressure side cylinder 12 and a high pressure side cylinder 16 to a crankcase 11 to be described later at positions facing each other in the horizontal direction. It is configured.

  Reference numeral 11 denotes a crankcase formed in a substantially cylindrical shape centering on an axis extending in the left and right directions. The crankcase 11 is provided with a cylinder mounting portion 11A and a cylinder mounting portion 11B on the opposite side in the radial direction across the axis, that is, on the rear position and the front position facing each other in the horizontal direction across the axis. . Further, one end side of the crankcase 11 is closed by a lid 11C, and a motor unit 8 is attached to the other end side. The crankcase 11 is attached to the bottom of the base member 2A via a vibration isolating rubber 11D.

  Reference numeral 12 denotes a low-pressure side cylinder provided on the rear side of the crankcase 11. The low-pressure side cylinder 12 sucks outside air and supplies compressed air to the high-pressure side cylinder 16. The low-pressure side cylinder 12 is provided at the front end (rear end) of the cylindrical cylinder 13 attached to the cylinder attachment portion 11A of the crankcase 11 in a state of extending to the rear side in the horizontal direction. A compression seat is defined between the valve seat member 14, a cylinder head 15 provided on the rear end side of the valve seat member 14, and a reciprocating motion in the cylinder 13. The main part is composed of a piston, a connecting rod that connects the piston to the rotating shaft 8B of the motor unit 8, and a suction valve and a discharge valve (both not shown) provided on the valve seat member 14. .

  Further, the cylinder head 15 is provided with a suction port that communicates with the suction chamber and a discharge port 15A (see FIG. 3) that communicates with a discharge chamber (both not shown). It is provided downwards at the bottom. Thereby, even if the compressed air remaining in the discharge chamber is condensed and drainage is generated when the operation is stopped, the drainage can be discharged from the downward discharge port 15A to the communication pipe 27 described later.

  Reference numeral 16 denotes a high-pressure side cylinder provided on the front side of the crankcase 11. The high-pressure side cylinder 16 recompresses the compressed air discharged from the low-pressure side cylinder 12 and supplies the compressed air to the tank 3 as high-pressure compressed air. is there. As shown in FIG. 5, the high-pressure side cylinder 16 is roughly constituted by a cylinder 17, a valve seat member 18, a suction valve 19, a discharge valve 20, a piston 21, a cylinder head 24 and the like which will be described later.

  Reference numeral 17 denotes a cylindrical cylinder attached to the cylinder attachment portion 11B of the crankcase 11 in a state extending to the front side in the horizontal direction. The cylinder 17 is disposed at a position facing the low pressure side cylinder 13 in the horizontal direction.

  Reference numeral 18 denotes a valve seat member provided at the front end (front end) of the cylinder 17, and the valve seat member 18 defines a compression chamber 23 between the piston 21 described later. As shown in FIG. 5, the valve seat member 18 is provided with a suction port 18A at a position corresponding to a suction chamber 25 of a cylinder head 24 described later. Further, a discharge port 18B is provided at a position corresponding to the discharge chamber 26 of the cylinder head 24, as shown in FIG.

  19 is a suction valve provided on the valve seat member 18 located on the cylinder 17 side, and the suction valve 19 is formed of a metal plate having a spring property. The suction valve 19 opens the suction port 18A during the suction stroke of the piston 21 and closes it during the discharge stroke.

  Reference numeral 20 denotes a discharge valve provided on the valve seat member 18 on the cylinder head 24 side (see FIG. 7 and the like). The discharge valve 20 is formed of a metal plate having spring properties and is disposed in the discharge chamber 26 of the cylinder head 24. The discharge valve 20 opens the discharge port 18B in the discharge stroke of the piston 21 and closes it in the suction stroke.

  Reference numeral 21 denotes a piston (see FIG. 5) fitted in the cylinder 17 so as to be able to reciprocate. Reference numeral 22 denotes a connecting rod for connecting the piston 21 to the rotating shaft 8B of the motor unit 8. The piston 21 defines a compression chamber 23 between the piston 21 and the valve seat member 18 in the cylinder 17.

  Reference numeral 24 denotes a cylinder head provided on the front surface side of the valve seat member 18. The cylinder head 24 is bolted to the crankcase 11 together with the cylinder 17 and the valve seat member 18, for example. Further, as shown in FIGS. 8 and 9, the cylinder head 24 is formed in a short covered rectangular tube shape having an upper wall surface portion 24A, a lower wall surface portion 24B, a left wall surface portion 24C, a right wall surface portion 24D, and a closing surface portion 24E. ing.

  Further, a J-shaped partition wall 24F is provided at a corner between the lower wall surface portion 24B and the right wall surface portion 24D, and is located at an intermediate portion in the upper and lower directions. The partition wall 24F, the lower wall surface portion 24B, A space surrounded by the wall surface portion 24D is a suction chamber 25 described later. Further, the upper wall surface portion 24A, the lower wall surface portion 24B, the left wall surface portion 24C, and the right wall surface portion 24D constitute a peripheral wall surface that surrounds a discharge chamber 26 described later from the upper, lower, left, and right directions. In the lower wall surface portion 24B located on the lower side of the discharge chamber 26, the upper surface surrounding the lower side of the discharge chamber 26 is an inclined wall surface 24G. The inclined wall surface 24G is formed in the discharge chamber 26 as described later. Drain is discharged.

  The right wall surface 24D located on the right side of the cylinder head 24 is provided with a suction port 24H in communication with the suction chamber 25 in a lateral direction. On the other hand, the left wall surface portion 24C located on the left side is provided with a discharge port 24J in a lateral direction so as to communicate with the discharge chamber 26.

  Here, reference numeral 25 denotes a suction chamber provided on the right side in the cylinder head 24. The suction chamber 25 is formed as a space portion surrounded by the lower wall surface portion 24B, the right wall surface portion 24D, and the partition wall 24F of the cylinder head 24. The suction chamber 25 communicates with the suction port 24 </ b> H of the cylinder head 24 and the suction port 18 </ b> A of the valve seat member 18.

  Reference numeral 26 denotes a discharge chamber provided on the upper side in the cylinder head 24. The discharge chamber 26 is surrounded by the upper wall surface portion 24A, the lower wall surface portion 24B, the left wall surface portion 24C, and the right wall surface portion 24D from the upper, lower, left, and right directions, and the upper wall surface portion 24A, the inclined wall surface 24G, It is defined by closing the left wall surface portion 24C and the right wall surface portion 24D with the closing surface portion 24E. Further, an inclined wall surface 24G of the lower wall surface portion 24B is disposed below the discharge chamber 26, and the drain generated in the discharge chamber 26 flows down toward the inclined wall surface 24G.

  A communication pipe 27 is connected to the suction port 24H of the cylinder head 24 as shown in FIG. 5, and the suction port 24H is a discharge port provided in the cylinder head 15 of the low-pressure side cylinder 12 via the communication pipe 27. 15A. Further, a discharge pipe 28 is connected to the discharge port 24J, and is connected to the tank 3 through the discharge pipe 28.

  Since the air compressor 1 is formed thin so that it can be suspended and transported with one hand, the cylinder head 24 is located in the vicinity of the tank 3, and a communication pipe 27 and a discharge pipe 28 are provided around it. The base member 2A and the cover member 2B of the casing 2 are also close to each other. For this purpose, the suction port 24H and the discharge port 24J are arranged at the right position and the left position of the cylinder head 24 in consideration of, for example, workability for inspection and maintenance.

  Here, the inclined wall surface 24G and the discharge port 24J provided in the cylinder head 24, which are characteristic portions of the first embodiment, will be described in detail.

  The inclined wall surface 24G provided on the lower wall surface portion 24B of the cylinder head 24 is configured to attach the bottom surface of the base member 2A of the casing 2 to the posture in which the air compressor 1 is operated, that is, the ground surface, floor surface, etc. of the work site. When arranged flat (when in the state shown in FIG. 9), the lower wall surface of the discharge chamber 26 is formed. In this operating state, the inclined wall surface 24G is inclined downward toward the discharge port 24J provided in the left wall surface portion 24C.

  With this configuration, when the compressed air remaining in the discharge chamber 26 is condensed to generate drain (moisture), the drain is divided into the right wall surface portion 24D, the closing surface portion 24E, the partition wall 24F, the valve seat. It flows along the member 18 and flows down to the lower inclined wall surface 24G. Then, the inclined wall surface 24G can sequentially discharge the drain from the discharge port 24J by causing the drained flow to flow toward the discharge port 24J by inclination.

  Further, since the discharge port 24J of the cylinder head 24 is provided so as to open at the corners of the left wall surface portion 24C and the inclined wall surface 24G, the left wall surface portion 24C, the closing surface portion 24E, the inclined wall surface in the discharge chamber 26. The drain that flows along the valve seat member 18 can be effectively guided to the discharge port 24J.

  The two-stage horizontally opposed reciprocating air compressor 1 according to the first embodiment has the above-described configuration. Next, the operation thereof will be described.

  First, when power is supplied from the control device 6 to the motor unit 8 of the compressor body 7 to rotate the rotary shaft 8B, the low pressure side cylinder 12 of the compression unit 10 reciprocates the piston in the cylinder 13 and sucks the outside air And are discharged from the discharge port 15A of the cylinder head 15. The compressed air discharged from the discharge port 15 </ b> A is supplied to the high-pressure side cylinder 16 through the communication pipe 27.

  Next, the high pressure side cylinder 16 reciprocates the piston 21 in the cylinder 17, and the compressed air supplied from the communication pipe 27 while opening the suction valve 19 in the suction stroke is used as the suction port 24 </ b> H of the cylinder head 24. The suction chamber 25 and the suction port 18A of the valve seat member 18 are sucked into the compression chamber 23. Subsequently, in the compression stroke, the compressed air sucked into the compression chamber 23 is further compressed by the piston 21, thereby opening the discharge valve 20 and discharging it from the discharge port 18 </ b> B of the valve seat member 18 to the discharge chamber 26. Thereby, the high-pressure compressed air discharged into the discharge chamber 26 can be supplied to the tank 3 from the discharge port 24J of the cylinder head 24 via the discharge pipe 28.

  On the other hand, when the operation of the reciprocating air compressor 1 is stopped, high-pressure compressed air discharged from the compression chamber 23 remains inside the discharge chamber 26, the discharge pipe 28, and the like. When the temperature of the compressed air is lowered in this state, moisture in the compressed air is condensed and drainage is generated. The drain generated in the discharge chamber 26 flows down to the lower inclined wall surface 24G through the right wall surface portion 24D, the closing surface portion 24E, the partition wall 24F, and the valve seat member 18, and the inclined wall surface 24G discharges the drain. It is possible to flow toward the outlet 24J and sequentially discharge from the outlet 24J.

  Furthermore, when performing inspection and maintenance work of the reciprocating air compressor 1, the tank 3, the control device 6, the compressor main body 7 and the like can be exposed by removing the cover member 2B of the casing 2. Here, the high-pressure side cylinder 16 is disposed close to the tank 3, and pipes 27 and 28 are connected thereto. However, by providing the suction port 24H at the right position of the cylinder head 24 and the discharge port 24J at the left position, maintenance work such as inspection work, attachment / detachment, and retightening work of the pipes 27 and 28, etc. can be easily performed. it can.

  According to the first embodiment configured as described above, the cylinder head 24 of the high pressure side cylinder 16 is provided with the discharge port 24J in the left wall surface portion 24C, and the lower wall surface portion 24B positioned below the discharge chamber 26. In this configuration, an inclined wall surface 24G that is inclined downward toward the discharge port 24J is formed. Accordingly, when the compression operation is stopped and the compressed air remaining in the discharge chamber 26 is cooled and drainage due to condensation occurs, the drain in the discharge chamber 26 can be moved to the discharge port 24J side by the inclined wall surface 24G. The discharge can be sequentially discharged from the discharge port 24J. Thereby, even when the discharge port 24J is provided in the left wall surface portion 24C of the cylinder head 24, the drain generated in the discharge chamber 26 can be discharged to the discharge pipe 28 side.

  As a result, since it is possible to prevent the drain from accumulating in the discharge chamber 26, it is possible to prevent the discharge valve 20 from being rusted by the remaining drain, and the airtightness when the discharge valve 20 is closed is prolonged. It can be kept good over the entire range. Thereby, the compression efficiency of the compression part 10 of the compressor main body 7 can be improved, and the compression performance, reliability, etc. of the reciprocating air compressor 1 can be improved.

  Moreover, in the first embodiment, the air compressor 1 is formed thin, the horizontally opposed compression unit 10 is used in accordance with this, and the cylinder head 24 is disposed in the vicinity of the tank 3, Therefore, the suction port 24H and the discharge port 24J of the cylinder head 24 are positioned at the left and right positions of the cylinder head 24 in consideration of workability for inspection and maintenance. Need to be placed. However, according to the present embodiment, even when the discharge port 24J is disposed at the left position of the cylinder head 24, the drain in the discharge chamber 26 can be discharged. An excellent effect can be obtained in the portable reciprocating air compressor 1.

  Further, the discharge port 24J is provided to be opened at the corners of the left wall surface portion 24C and the inclined wall surface 24G (lower wall surface portion 24B) of the cylinder head 24. Therefore, the drain that flows along the left wall surface portion 24C, the closing surface portion 24E, the inclined wall surface 24G, and the valve seat member 18 in the discharge chamber 26 can be effectively guided to the discharge port 24J, and the drain is efficiently discharged from the discharge port 24J. Can drain well.

  Next, FIGS. 10 and 11 show a second embodiment of the present invention, and the feature of this embodiment is that a suction valve is provided on the piston. This configuration is applied to the first cylinder of a single-cylinder reciprocating compressor or a multi-cylinder reciprocating compressor that compresses in a plurality of stages. In the second embodiment, for example, 1 A case where it is applied to a low-pressure side cylinder will be described as an example.

  In FIG. 10, reference numeral 31 denotes a low-pressure side cylinder according to the second embodiment. Reference numeral 32 denotes a cylinder constituting the low-pressure side cylinder 31, and a valve seat member 33 is provided at the tip of the cylinder 32. Further, the valve seat member 33 is provided with only a discharge port 33 </ b> A due to a later-described suction valve 36 provided on the piston 35. Further, the valve seat member 33 is provided with a discharge valve 34 for opening and closing the discharge port 33A.

  Reference numeral 35 denotes a piston provided in the cylinder 32. A valve housing recess 35A is formed on the end surface of the piston 35, and a suction port 35B capable of communicating with the outside is provided at the bottom of the valve housing recess 35A. ing. A suction valve 36 for opening and closing the suction port 35B is disposed in the valve housing recess 35A of the piston 35.

  Further, 37 is a cylinder head provided on the front surface side of the valve seat member 33. The cylinder head 37 is a partition wall provided in the cylinder head 24 according to the first embodiment as shown in FIGS. 24F, the suction port 24H, and the suction chamber 25 are abolished.

  That is, the cylinder head 37 is formed in a short covered rectangular tube shape having an upper wall surface portion 37A, a lower wall surface portion 37B, a left wall surface portion 37C, a right wall surface portion 37D, and a closing surface portion 37E, and the inside becomes a discharge chamber 38. ing. Further, the upper surface of the lower wall surface portion 37B is an inclined wall surface 37F, and a discharge port 37G is provided in the left wall surface portion 37C. A communication pipe 39 is connected to the discharge port 37G.

  Thus, in the second embodiment configured as described above, it is possible to obtain substantially the same operational effects as those in the first embodiment. In particular, according to the second embodiment, even the low-pressure side cylinder 31 can prevent compression leakage due to the generation of drain, so that the compression performance and the like can be further improved.

  In the first embodiment, the case where the lower wall surface portion 24B of the cylinder head 24 is formed thick in the upward and downward directions has been described as an example. However, the present invention is not limited to this. For example, the present invention may be configured as a modification shown in FIG.

  That is, as shown in FIG. 12, the cylinder head 41 is formed in a short covered rectangular tube shape having an upper wall surface portion 41A, a lower wall surface portion 41B, a left wall surface portion 41C, a right wall surface portion 41D, and a closing surface portion 41E, and a suction chamber Between the partition wall 41F that defines 42 and the left wall surface portion 41C, an inclined wall surface portion 41G may be provided separately from the lower wall surface portion 41B. In this configuration, the upper wall surface portion 41A, the inclined wall surface portion 41G and the left wall surface portion 41C, and the right wall surface portion 41D constitute a peripheral wall surface that surrounds the discharge chamber 43 from the upper, lower, left, and right directions. Further, a portion surrounded by the lower wall surface portion 41B, the left wall surface portion 41C, the right wall surface portion 41D, and the inclined wall surface portion 41G can be formed as a lightening portion 44, and the lightening of the cylinder head 41 by this lightening portion 44. Can do. This configuration can be similarly applied to the second embodiment.

  Further, in the first embodiment, the description has been made by taking as an example the compression unit 10 that constitutes a two-stage horizontally opposed air compressor in which the cylinders 12 and 16 are disposed to face each other in the horizontal direction. However, the present invention is not limited to this, and for example, a single-stage or three-stage or more reciprocating compressor, a single cylinder or a three- or more-cylinder reciprocating compressor may be used as the compression unit. Moreover, as a cylinder arrange | positioned in a horizontal direction, the form which raised the cylinder somewhat upwards from the horizontal direction is included, and it can also apply to multiple cylinders (V type etc.). This configuration can be similarly applied to the second embodiment.

  Furthermore, in each embodiment, the portable reciprocating air compressor 1 which accommodated the tank 3, the compressor main body 7, etc. in the casing 2 was mentioned as an example, and was demonstrated. However, the present invention is not limited to this, and may be applied to, for example, a stationary package compressor housed in a package or the like.

DESCRIPTION OF SYMBOLS 1 Reciprocating air compressor 2 Casing 3 Tank 7 Compressor body 8 Motor part 10 Compression part 11 Crankcase 12, 31 Low pressure side cylinder 13, 17, 32 Cylinder 14, 18, 33 Valve seat member 15, 24, 37, 41 Cylinder head 15A, 24J, 37G, 41J Discharge port 16 High pressure side cylinder 18A, 35B Suction port 18B, 33A Discharge port 19, 36 Suction valve 20, 34 Discharge valve 21, 35 Piston 22 Connecting rod 23 Compression chamber 24A, 37A, 41A Upper wall surface portion 24B, 37B, 41B Lower wall surface portion 24C, 37C, 41C Left wall surface portion 24D, 37D, 41D Right wall surface portion 24E, 37E, 41E Blocking surface portion 24F, 41F Partition wall 24G, 37F Inclined wall surface 24H, 41H Suction port 25, 42 Suction chamber 26, 38, 43 Discharge chamber 27, 39 Communication piping 28 Discharge piping 41G Inclined wall

Claims (3)

A compression case for compressing air, having a crankcase and a cylinder attached to the crankcase and arranged in a state extending horizontally from the crankcase;
A tank for storing air compressed by the compression unit;
A motor case, a rotating shaft disposed in the motor case, a stator fixed in the motor case, and a rotor positioned on the inner peripheral side of the stator and fixed to the rotating shaft; A motor portion mounted in the crankcase;
A piston connected to the rotating shaft of the motor unit and removably inserted into the cylinder;
A valve seat member provided at an end of the cylinder opposite to the crankcase side and having a suction port and a discharge port defining a compression chamber between the piston and the compression chamber;
A suction valve provided in the valve seat member for opening and closing the suction port;
A discharge valve provided on the valve seat member for opening and closing the discharge port;
The valve seat member is provided on a side opposite to the side where the compression chamber is located, and defines a suction chamber that can communicate with the suction port and a discharge chamber that can communicate with the discharge port. A peripheral wall surface that surrounds the direction, left and right directions, a closed surface that closes the peripheral wall surface, and a discharge port that is opened in one peripheral wall portion located in the left or right direction of the peripheral wall surface configured, enclose the discharge opening from the downward direction of the circumferential wall, the circumferential wall portion disposed below the discharge port of the valve seat member as an inclined wall inclined downwardly toward said discharge port A formed cylinder head;
A reciprocating compressor.   2. The reciprocating compressor according to claim 1, wherein the discharge port of the cylinder head is configured to open at a corner position between the one peripheral wall surface portion and the inclined wall surface.   The reciprocating compressor according to claim 1 or 2, wherein a thinning portion is formed below the peripheral wall surface portion surrounding the discharge port from the lower side of the peripheral wall surface of the cylinder head.

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