JP4420078B2 - Reciprocating compressor - Google Patents

Description

  The present invention relates to a reciprocating compressor having a plurality of cylinders.

  An example of a small piston pump used in a conventional oxygen concentrator or the like is disclosed in Patent Document 1. The pump disclosed in Patent Document 1 has a plurality of wall portions that define two cylinders and each define two passages that open at two transfer openings on opposite sides of the cylinder. The crankcase and each valve plate have a pair of valve ports communicating with the working air inside the cylinder, and the valve ports are opened and closed by valves mounted on the valve plate, and each of the valve plates is a pair A plurality of valve plates mounted in a plurality of cylinders having a plurality of transfer ports and a plurality of valve ports of each valve plate so as to define two separated air chambers in each valve head Two valve heads mounted on the valve plate and having one of the plurality of transfer ports disposed in each chamber outside the cylinder. When, and a, a transfer tube connected between the said valve plate transfer port crankcase transfer openings to connect each air chamber to the passageway. In this pump, the piston operates as a parallel pressure or parallel vacuum pump in which the piston reciprocates with a phase shift of 180 degrees. Thus, the intake chamber or the exhaust chamber can be coupled to the inside of the crankcase, or the valve head can be coupled together without using a hose.

JP 2004-211708 A

  However, in the technique of the above-mentioned patent document 1, since the passage portion protrudes greatly outside the crankcase of the pump, the size of the pump increases accordingly. The technique of Patent Document 1 can be applied to a counter head type pump in which the heads are arranged in the same line in a plan view, but like a pump having four heads arranged so as to be shifted by 90 degrees. Furthermore, it cannot be applied to a pump in which the heads are not arranged on the same line in plan view. In such a pump in which the heads are not arranged on the same line in a plan view, for example, an integration flow path for integrating the flow paths between the cylinders is connected to the casing in order to connect the flow paths between the cylinders. It is conceivable to form it outside the outside, but in that case as well, the integration flow channel greatly protrudes to the outside of the casing, and the pump unit is enlarged accordingly.

  Therefore, the present invention has been made to solve the above-described problems, and an object thereof is to provide a reciprocating compressor capable of integrating the flow paths between a plurality of cylinders while preventing an increase in size.

A reciprocating compressor according to a first invention includes a motor having a motor shaft, a casing that houses the motor shaft, a plurality of cylinders, and a plurality of pistons disposed inside each of the plurality of cylinders, A plurality of suction passages that are connected to the inside of each of the plurality of cylinders and that allow fluid to flow therethrough, and that are connected to the inside of each of the plurality of cylinders and that have fluid inside. A plurality of flowable discharge channels, an integrated suction channel for integrating the plurality of suction channels, and an integrated discharge channel for integrating the plurality of discharge channels; Each of the plurality of cylinders is arranged such that a cylinder axial direction is along a direction orthogonal to the axial direction of the motor shaft, and the integrated suction flow path and the integrated discharge flow path Small At least one of them is arranged so as to overlap at least one of the shaft region on the extension line of the motor shaft and the peripheral region outside the shaft region and inside the outer peripheral portion of the casing, At least one of the integrated discharge flow channel and the integrated suction flow channel is formed in the bearing support portion, and at least one of the plurality of discharge flow channels is discharged from the adjacent cylinder. become common flow path of the fluid, and / or, wherein at least one of the plurality of intake passages, Ri Do a common flow path for fluid supplied to the adjacent the cylinder, a common fluid flow path the The discharge flow path is disposed between adjacent cylinders, and the suction flow path serving as a common flow path of fluid is between the adjacent cylinders, and the discharge flow serving as a common flow path of fluid. Road is arranged It is disposed between adjacent cylinders which are not.

In this reciprocating compressor, at least one of the integrated suction flow path and the integrated discharge flow path is provided, so that the flow paths between the plurality of cylinders can be integrated. Further, at least one of the integrated suction flow path and the integrated discharge flow path is disposed so as to overlap with at least one of the axial region along the axial direction of the motor shaft and the peripheral region thereof, By providing the integrated flow path, it is possible to prevent the entire compressor from becoming large. As a result, with this configuration, it is possible to integrate the flow paths between the plurality of cylinders while suppressing an increase in size.
In this reciprocating compressor, since the suction flow path and the discharge flow path are separated from each other, it is possible to prevent heat from being transmitted between the suction flow path and the discharge flow path.

Here, “overlapping” means that the integrated suction flow path or the integrated discharge flow path is disposed so as to be within a region composed of the axial region and the peripheral region .
A reciprocating compressor according to a second aspect of the present invention is the reciprocating compressor according to the first aspect of the present invention, wherein the plurality of cylinders are composed of four cylinders arranged so as to be shifted by approximately 90 degrees in plan view, A pair of the discharge passages arranged to face each other with the motor shaft interposed therebetween are adjacent to each other between the first cylinder and the second cylinder adjacent to each other in the rotation direction of the motor shaft and to the rotation direction of the motor shaft. A pair of the suction passages that are arranged between the third cylinder and the fourth cylinder and are opposed to each other with the motor shaft interposed therebetween are connected to the second cylinder adjacent to the rotation direction of the motor shaft and the second cylinder. 3 cylinders and between the 4th cylinder and the 1st cylinder which adjoin the rotation direction of the motor shaft.
In this reciprocating compressor, the space between the cylinders can be effectively used to prevent the casing from becoming large, and the suction flow path and the discharge flow path are separated from each other. It is possible to prevent heat from being transferred.

A reciprocating compressor according to a third invention is the reciprocating compressor according to the first or second invention, wherein at least one of the integrated suction channel and the integrated discharge channel is the shaft region. It is formed as an annular flow channel centering on.

  In this reciprocating compressor, since the integrated flow path is an annular flow path, the flow paths can be made compact, and an increase in size can be easily suppressed. Further, for example, by making the integrated discharge channel annular, a heat radiation area of the fluid can be secured, and the compression efficiency is improved.

In a reciprocating compressor according to a fourth aspect of the present invention, in the reciprocating compressor according to the third aspect of the invention, the integrated discharge flow path formed as the annular flow path is in a plane perpendicular to the axial direction of the motor shaft. It is formed so as to spread along the plane.

  In this reciprocating compressor, it is possible to easily secure the heat radiation area for improving the compression efficiency while suppressing the increase in size of the compressor due to the integrated discharge flow path.

A reciprocating compressor according to a fifth aspect of the present invention is the reciprocating compressor according to any one of the first to fourth aspects, wherein each of the plurality of discharge passages is a first along the axial direction of the motor shaft. It has a parallel part.

  In this reciprocating compressor, since the discharge flow path has a portion along the axial direction of the motor shaft, the discharge flow path can be arranged efficiently.

A reciprocating compressor according to a sixth aspect is the reciprocating compressor according to the fifth aspect , wherein the first parallel portion is formed inside the casing.

  In this reciprocating compressor, since the first parallel part of the discharge flow path is formed inside the casing, there is no need to separately provide a member for forming a flow path such as a pipe, or a flow that is separately required. Since the number of members for forming the path can be reduced, the discharge flow path can be arranged more efficiently by reducing the number of parts while suppressing an increase in size of the compressor. Moreover, since the casing itself becomes a heat radiating portion, the heat radiating area can be greatly increased, and the compression efficiency is further improved.

  In addition, normally, a flow path is formed inside the reinforcing portion that is a skeleton of the casing, and the casing can be effectively used while ensuring the function of the casing.

A reciprocating compressor according to a seventh invention is the reciprocating compressor according to the first to sixth inventions, wherein the motor has a main body, and the integrated suction flow path and the integrated discharge flow path are , With respect to the axial direction of the motor shaft, disposed on both sides of the plurality of cylinders, and either one of the integrated suction flow path and the integrated discharge flow path is disposed on the shaft end side of the motor shaft. The other is disposed on the main body side.

  In this reciprocating compressor, it is possible to efficiently arrange both the integrated suction flow path and the integrated discharge flow path while suppressing an increase in size of the compressor. Further, by separating the integrated suction flow path and the integrated discharge flow path, it is possible to prevent heat from being transmitted between them, and the compression efficiency is further improved.

In such reciprocating compressor to the eighth invention, in the reciprocating compressor according to the invention of the first to seventh, wherein each of the plurality of suction passages, a second parallel portion extending in the axial direction of the motor shaft Have.

  In this reciprocating compressor, since the suction channel has a portion along the axial direction of the motor shaft, the suction channel can be arranged efficiently.

A reciprocating compressor according to a ninth invention is the reciprocating compressor according to the first to eighth inventions, wherein the casing includes a first member and a second member, and the plurality of discharges The flow path is formed to pass through the inside of the first member, and the plurality of suction flow paths are formed to pass through the inside of the second member, and the first member, the second member, Is formed as a separate body, and the thermal conductivity of the first member is higher than the thermal conductivity of the second member.

  In this reciprocating compressor, each of the suction flow path and the discharge flow path is formed inside the separate second member and first member, and the thermal conductivity is different between the first member and the second member. Thus, it is possible to prevent the heat of the discharge channel from being transmitted to the suction channel, and the compression efficiency is further improved.

In a reciprocating compressor according to a tenth aspect of the invention, in each of the reciprocating compressors according to the first to eighth aspects of the invention, each of the plurality of discharge flow paths is a first parallel portion along the axial direction of the motor shaft. Each of the plurality of suction flow paths has a second parallel portion along the axial direction of the motor shaft, and the pair of first parallel portions and the pair of second parallel portions, Formed inside the casing, the pair of first parallel portions are disposed opposite to each other with the motor shaft interposed therebetween, and the pair of second parallel portions are disposed opposite to each other with the motor shaft interposed therebetween. Are arranged.

In this reciprocating compressor, by forming both the first parallel part of the discharge flow path and the second parallel part of the suction flow path inside the casing, the casing can be effectively used without waste, and more efficiently. The flow paths between multiple cylinders can be integrated while preventing an increase in size.
A reciprocating compressor according to an eleventh aspect of the present invention is the reciprocating compressor according to any of the first to tenth aspects of the present invention, further comprising a bearing support portion disposed at a shaft end portion of the motor shaft, wherein the integrated discharge flow At least one of the path and the integrated suction channel is formed in the bearing support portion.
In this reciprocating compressor, by effectively utilizing the bearing support member and the space around it, the flow paths between the plurality of cylinders can be integrated while efficiently suppressing an increase in size.

  As described above, according to the present invention, the following effects can be obtained.

In 1st invention, the flow path between several cylinders can be integrated by providing at least any one of an integrated suction flow path and an integrated discharge flow path. Further, at least one of the integrated suction flow path and the integrated discharge flow path is disposed so as to overlap with at least one of the axial region along the axial direction of the motor shaft and the peripheral region thereof, By providing the integrated flow path, it is possible to prevent the entire compressor from becoming large. As a result, with this configuration, it is possible to integrate the flow paths between the plurality of cylinders while suppressing an increase in size.
Further, since the intake Iriryu path and the discharge flow path is disengaged, it is possible to heat between the suction passage and the discharge passage are suppressed from being transmitted.
Further, in the second invention, the space between the cylinders can be effectively used to prevent the casing from becoming large, and the suction flow path and the discharge flow path are separated from each other. Heat can be prevented from being transferred between them.

Moreover, in 3rd invention, since an integrated flow path is made into an annular flow path, it becomes possible to collect a flow path compactly and can suppress an enlargement easily. Further, for example, by making the integrated discharge channel annular, a heat radiation area of the fluid can be secured, and the compression efficiency is improved.

In the fourth aspect of the present invention, it is possible to easily secure the heat radiation area for improving the compression efficiency while suppressing the increase in size of the compressor due to the integrated discharge flow path.

Moreover, in 5th invention, a discharge flow path can be arrange | positioned efficiently because a discharge flow path has the part along the axial direction of a motor shaft.

In the sixth aspect of the invention, the first parallel part of the discharge flow path is formed inside the casing, so that it is not necessary to separately provide a member for forming a flow path such as a pipe, or is separately required. Since the number of members for forming the flow path can be reduced, the discharge flow path can be arranged more efficiently by reducing the number of parts while suppressing the increase in size of the compressor. Moreover, since the casing itself becomes a heat radiating portion, the heat radiating area can be greatly increased, and the compression efficiency is further improved.

In the seventh invention, it is possible to efficiently arrange both the integrated suction flow path and the integrated discharge flow path while suppressing an increase in the size of the compressor. Further, by separating the integrated suction flow path and the integrated discharge flow path, it is possible to prevent heat from being transmitted between them, and the compression efficiency is further improved.

In the eighth invention, since the suction flow path has a portion along the axial direction of the motor shaft, the suction flow path can be arranged efficiently.

In the ninth invention, each of the suction channel and the discharge channel is formed inside the second member and the first member which are separate members, and the first member and the second member have a thermal conductivity. By being different, the heat of the discharge channel can be prevented from being transmitted to the suction channel, and the compression efficiency is further improved.

In the tenth aspect of the invention, by forming both the first parallel part of the discharge flow path and the second parallel part of the suction flow path inside the casing, the casing can be effectively used without waste and more efficiently. In addition, it is possible to integrate the flow paths between the plurality of cylinders while suppressing the increase in size.
In the eleventh aspect of the invention, by effectively utilizing the bearing support member and the surrounding space, it is possible to integrate the flow paths between the plurality of cylinders while efficiently suppressing an increase in size.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view showing a reciprocating compressor according to a first embodiment of the present invention. 2 is a schematic view of the reciprocating compressor of FIG. 1, (a) is a schematic top view, (b) is a schematic side view as viewed from the arrow X, and (c) is a schematic diagram as viewed from the side of the arrow Y. . FIG. 3 is a schematic cross-sectional view taken along arrow AA in FIG. FIG. 4 is a schematic cross-sectional view taken along the line BB in FIG. FIG. 5 is a schematic cross-sectional view taken along the line CC in FIG. FIG. 6 is a schematic cross-sectional view taken along the line DD in FIG. FIG. 7 is a schematic cross-sectional view taken along the line E-E in FIG. 3. FIG. 8 is a schematic perspective view of the reciprocating compressor as viewed in the direction of arrow Z in FIG. FIG. 9 is a schematic perspective view showing a second member in the casing of FIG. 1. 10A and 10B are schematic views of the second member in FIG. 9, where FIG. 10A is a sectional view taken along the line TU-V of FIG. 9B, FIG. 10B is a schematic top view, and FIG. Schematic, (d) is a schematic side view as viewed from the arrow Y, and (e) is a JJ cross-sectional view. FIG. 11 is a perspective schematic view showing a first member in the casing of FIG. 1. 12 is a schematic view of the first member of FIG. 11, (a) is a schematic top view, (b) is a schematic side view as viewed from the arrow X, (c) is a schematic bottom view, and (d) is Y. An arrow side view schematic, (e) is a HH arrow sectional drawing. 13 is a cross-sectional view of the first member in FIG. 11, (a) is a schematic cross-sectional view taken along line FF in FIG. 12, and (b) is a schematic cross-sectional view taken along line GG in FIG. 12. FIG. 14 is a schematic perspective view showing the bearing support member of FIG. FIG. 15 is a schematic view of the bearing support member of FIG. 14, (a) is a schematic view in bottom view, (b) is a schematic view in cross-section along arrow NN, and (c) is a schematic view in cross-section along arrow MM. It is. 16A and 16B are schematic views of the bearing support member of FIG. 14, where FIG. 16A is a schematic front view and FIG. 16B is a schematic cross-sectional view taken along the line OO. FIG. 17 is a schematic view of the cylinder of FIG. 1, (a) is a schematic side view as viewed in the direction of arrow X in (b), (b) is a schematic view in front view, and (c) is a schematic view in cross section taken along the line KK. It is. FIG. 18 is a perspective explanatory view showing components attached to the cylinder of FIG. 1 together with the cylinder. FIG. 19 is a schematic perspective view showing the head cover of FIG. 20 is a schematic view of the head cover of FIG. 19, where (a) is a schematic view of the inner surface, (b) is a schematic view of the side as viewed from the X direction, (c) is a schematic view of the outer surface, and (d) is a view as viewed from the LL arrow. FIG. FIG. 21 is an exploded explanatory view showing a piston inside the reciprocating compressor of FIG. 1. FIG. 22 is a schematic perspective view for explaining attachment of the casing in the assembly of the reciprocating compressor of FIG. 1. FIG. 23 is a perspective explanatory view for explaining the attachment of the piston in the assembly of the reciprocating compressor of FIG. 1. FIG. 24 is a perspective explanatory view for explaining attachment of a cylinder or the like in the assembly of the reciprocating compressor of FIG. FIG. 25 is a perspective explanatory view for explaining attachment of a bearing support portion, a casing cover and the like in the assembly of the reciprocating compressor of FIG. FIG. 26 is an explanatory schematic diagram for explaining the shaft region and its peripheral region in the reciprocating compressor of FIG. 1. 3 to 5, a side view of the motor is shown, and portions other than the motor are shown in cross section.

(overall structure)
First, the whole structure of the reciprocating compressor 1 concerning this embodiment is demonstrated. In this embodiment, the reciprocating compressor 1 is used as a compressor that sucks and compresses a gas fluid (air) in an oxygen concentrator or the like for generating high-concentration oxygen. Although not shown in the figure, the oxygen concentrator compresses the introduced air using the reciprocating compressor 1 and brings the discharged compressed air into contact with a synthetic zeolite (having a nitrogen adsorption function). It is configured to exhaust a concentration of oxygen.

  The reciprocating compressor 1 includes a motor 2, a casing 3, four cylinders 4, four pistons 5, a plurality of suction passages 6, a plurality of discharge passages 7, an integrated suction passage 9, The integrated discharge flow path 8 and the bearing support portion 10 are included. Then, the taken-in air flows into the four cylinders 4 through the integrated suction flow path 9 and the suction flow path 6 and is compressed there, and then passes through the discharge flow path 7 and the integrated discharge flow path 8 and finally. To the outside from the reciprocating compressor 1. Hereinafter, the configuration of each unit will be described.

(motor)
The motor 2 includes a motor shaft 2s and a main body 2b. The number of motors of the reciprocating compressor 1 is one, and the four pistons 5 are driven by one motor 2 (details will be described later).

(casing)
The casing 3 accommodates the motor shaft 2s and the like, and includes a first member 3f and a second member 3s (see FIGS. 22 and 23). The first member 3f and the second member 3s are formed as separate bodies, and the thermal conductivity of the first member 3f is higher than the thermal conductivity of the second member 3s. Specifically, the first member 3f is made of metal, and the second member 3s is made of resin. The first member and the second member are not limited to such materials. For example, the second member may be a metal member having a lower thermal conductivity than the first member, and the first member and the second member may be the same material. Moreover, the thermal conductivity of the second member may be higher than that of the first member. Hereinafter, the first member 3f and the second member 3s will be described.

(First member)
The first member 3f functions as a general casing. As described above, the first member 3 f is made of metal, and functions as a skeleton member around the motor shaft 2 s in the reciprocating compressor 1. Further, the first member 3f is configured to include four reinforcing portions 3w. The reinforcement part 3w is formed so that it may extend along a motor axial direction (refer FIGS. 11-13). More specifically, the first member 3f has four grooves 3r along the motor axial direction in each of the four wall portions in a square tube extending along the motor axial direction when attached to the motor 2. As a result, each wall portion of the first member 3f has a U-shape when viewed from the front, and the four corner portions of the first member 3f have reinforcing portions extending along the motor shaft direction. 3w is formed. In each of the four groove portions 3r formed between the four reinforcing portions 3w, there are connecting portions 5c (see FIG. 21) in the four pistons 5 and protruding portions 10z, 10w (described later) of the bearing support portion 10. (See FIGS. 23 and 25). Further, a motor through hole 3d through which the motor shaft 2s of the motor 2 and the like pass is formed at the center of the bottom plate portion 3q of the first member 3f in plan view (FIGS. 12A and 12C). ing. Furthermore, a part of the plurality of discharge flow paths 7 is formed inside the first member 3f (details will be described later).

  Each of the plurality of discharge flow paths 7 has a first parallel portion 7f along the axial direction of the motor shaft 2s (see FIGS. 13, 4, and 6). The first parallel portion 7 f is formed inside the casing 3. The first member 3f is formed with a total of four discharge inlets 3x corresponding to each of the four cylinders 4, and the four discharge inlets 3x are formed inside the four cylinders 4, respectively. Are connected to each other (see FIGS. 4 and 7). Further, in the first member 3f, two first parallel portions 7f are formed, and these are arranged at two corner portions that are not adjacent to each other so as to face each other across the motor shaft 2s (see FIG. 6). Two discharge inlets 3x are provided for one first parallel portion 7f. That is, one first parallel portion 7 f serves as a common flow path for the air discharged from the two cylinders 4. Specifically, referring to FIG. 6, what is connected to the inside of the upper and left two cylinders 4 is the first parallel portion 7f on the upper left, and the inside of the two cylinders 4 on the right and lower sides. The first parallel part 7f on the lower right is connected. In addition, in the four corners of the first member 3f, the two first parallel portions 7f are arranged at the upper left and lower right in FIG. 6, and two flow paths 106f are also formed at the upper right and lower left portions in FIG. (See FIG. 5), this is not used in this embodiment. In addition, in FIGS. 11-13, in order to clarify the correspondence between each figure in a total of four discharge inlets 3x, in particular, two discharge inlets 3x (a), 3x (b) The code | symbol is attached | subjected.

  The air compressed and discharged in each cylinder 4 is sent to the first parallel portion 7f through the discharge inlet 3x provided corresponding to each cylinder 4 (see FIG. 4 and the like). As in the present embodiment, by forming the flow path inside the reinforcing portion 3w that is the skeleton of the casing 3, the casing is effectively used while preventing the enlargement while ensuring the reinforcing function of the casing. it can.

(Second member)
The second member 3s is made of resin as described above, and includes the annular portion 3t, the two columnar portions 3v attached to the annular portion 3t, and the inhalation protruding portion 3u. (See FIGS. 9 and 10). The two columnar portions 3v and the suction projecting portion 3u are formed so as to extend along the axial direction of the motor shaft 2s attached to the motor 2 (see FIG. 10A). A part of a plurality of suction flow paths 6 is formed inside the two columnar parts 3v (details will be described later), and an integrated suction flow path 9 is formed inside the annular part 3t. (Refer to FIG. 10 (a), (b), FIG. 3 etc.). Further, the suction protrusion 3u is formed with a suction port 3z, and the air that has entered from the suction port 3z is sent to the integrated suction flow path 9 (see FIG. 4, FIG. 10C, etc.).

  Each of the plurality of suction flow paths 6 has a second parallel portion 6f along the axial direction of the motor shaft 2s (see FIGS. 10 and 5 to 7). In addition, a total of four suction outlets 3y corresponding to the four cylinders 4 are formed in the second member 3s. The suction outlet 3y is connected to the inside of each of the four cylinders 4 (see FIGS. 6, 10 (b), etc.). Further, in the second member 3s, two second parallel portions 6f are formed, and these are arranged so as to face each other with the motor shaft 2s interposed therebetween (see FIGS. 6, 10 (b), etc.). . Two suction outlets 3y are provided for one second parallel portion 6f. That is, one second parallel portion 6f serves as a common flow path for the air supplied to the two cylinders 4 (see the alternate long and short dash line portion indicating the suction flow path 6 in FIG. 10B). Specifically, referring to FIG. 6, what is connected to the inside of the upper and right two cylinders 4 is the second upper parallel part 6f, and the inside of the left and lower two cylinders 4 are connected to each other. What is connected is the lower left second parallel portion 6f. In addition, the two second parallel portions 6f are located facing the corners of the first member 3f, but in the four corners of the first member 3f, the corners with the two first parallel portions 7f (see FIG. 6 is located facing a corner (upper right and lower left corners in FIG. 6) different from the upper left and lower right corners in FIG. Thereby, since the suction flow path 6 and the discharge flow path 7 are separated from each other, it is possible to prevent the heat of the discharge flow path 7 from being transmitted to the suction flow path 6.

  Further, in the reciprocating compressor 1, the columnar portion 3v of the second member 3s is positioned between four cylinders 4 that are arranged even by 90 degrees in a plan view with respect to the circumferential direction of the motor shaft 2s (see FIG. 6 (refer to FIGS. 6 and 7). The maximum distance of the columnar part 3v from the center of the motor shaft 2s is substantially equal to the maximum distance of the head cover 4h from the center of the motor shaft 2s. Since the columnar portion 3v is contained in a quadrangle (see T in FIG. 6) formed by straight lines along the outer surfaces of the four head covers 4h in plan view, the space between the cylinders 4 is effectively used. The casing can be prevented from becoming large.

(Integrated suction flow path)
An integrated suction channel 9 formed inside the annular portion 3t is for integrating a plurality of suction channels 6. The integrated suction flow path 9 is formed as an annular flow path centering on the shaft region 31 along the axial direction of the motor shaft 2s (see FIG. 26). And the integrated suction flow path 9 is arrange | positioned so that it may overlap with the peripheral area | region 32 of the axial area | region 31 along the axial direction of the motor shaft 2s (refer FIG. 26). Details of this arrangement will be described later. Further, the integrated suction channel 9 is a space closed by a combination of the second member 3s and an eye flange 16 described later (see FIGS. 3 to 5). In addition, the integrated suction flow path may not be an annular flow path, and may be formed in a lump shape, for example. Further, in the present embodiment, the center of the circle of the integrated suction flow path 9 coincides with the center of the motor shaft 2s, thereby enabling a balanced arrangement with the motor shaft 2s as the center from the viewpoint of miniaturization. However, when the integrated suction channel is annular, the center of the circle of the integrated suction channel may not coincide with the center of the motor shaft, and the center may be shifted.

(Cylinder)
In the present embodiment, four cylinders are provided. Each of the four cylinders 4 is arranged such that the cylinder axis direction is along a direction orthogonal to the axial direction of the motor shaft 2s (see the arrow direction in FIG. 6, FIG. 23, etc.). Each of the four cylinders 4 has a compression chamber 4j (inside the cylinder) (see FIG. 17 and the like). Further, the cylinder 4 is configured to have a flat plate portion 4p orthogonal to the cylinder axial direction, and a part of the flat plate portion 4p becomes a part of a wall portion facing the compression chamber 4j (FIG. 17 ( c)). In addition, four through holes 4b, 4c, 4f, and 4g are formed in the flat plate portion 4p. In addition, a groove 4m is formed in the flat plate portion 4p (see FIG. 17 and the like).

  Each component as shown in FIG. 18 is attached to the cylinder 4. Specifically, the discharge valve 4w, the discharge valve retainer 4z, and the intake valve 4v are attached by a fixing screw 20a and a washer 20b. The intake valve 4v is attached to the compression chamber 4j side inside the cylinder 4, and the exhaust valve 4w and the exhaust valve retainer 4z are attached to the outside of the cylinder 4 (see FIGS. 18 and 6). The intake valve 4v is normally closed. When the pressure of the air passing through the through hole 4c exceeds a predetermined level, the intake valve 4v is bent and opened. Further, the discharge valve 4w is normally in a closed state, and when the pressure of the compressed air passing through the through hole 4f exceeds a predetermined level, the discharge valve 4w bends (while the maximum deflection angle is limited by the discharge valve presser 4z). Opened.

  Further, a head cover 4h is attached to each cylinder 4 (see FIGS. 19 and 20). The head cover 4h is formed with an internal space and a partition 4s, and the internal space of the head cover 4h is separated into a first room 4n and a second room 4k by the partition 4s. Here, the first room 4n is a space through which air before being supplied to the compression chamber 4j passes, and the second room 4k is a space through which air discharged from the compression chamber 4j passes. The head cover 4h is attached to the cylinder 4 with a cylinder packing 20e (see FIG. 24) formed so that the tip of the partition 4s fits into the groove 4m of the cylinder 4. The head cover 4h is attached to the cylinder 4. In the attached state, the partition portion 4s and the groove portion 4m are sealed by the cylinder packing 20e, and the first chamber 4n and the second chamber 4k are formed inside the head cover 4h by the head cover 4h and the flat plate portion 4p ( It is formed as a closed space (except when the exhaust valve 4w or the intake valve 4v is open) (see FIG. 7).

  Hereinafter, a state in which the head cover 4h is attached to the cylinder 4 will be described. The through hole 4b is connected to the suction outlet 3y of the second member 3s, and the air that has passed through the second parallel portion 6f is supplied to the first chamber 4n through the suction outlet 3y and the through hole 4b. (See FIG. 6). The through hole 4c is a hole through which air introduced through the through hole 4b passes, and the air in the first chamber 4n is sent to the compression chamber 4j through the through hole 4c (see FIG. 6). The through-hole 4f is a hole through which compressed air discharged from the compression chamber 4j passes, and the compressed air passes through the through-hole 4f and then is sent to the through-hole 4g inside the second chamber 4k ( (See FIG. 18). The through hole 4g is connected to the discharge inlet 3x of the first member 3f, and the discharged compressed air is sent to the first parallel portion 7f through the through hole 4g and the discharge inlet 3x (see FIG. 7). Further, the internal space of the head cover 4h (outside the flat plate portion 4p) constitutes a part of the suction flow path 6 and the discharge flow path 7. Then, the air flow in the suction flow path 6 and the discharge flow path 7 in the internal space of the head cover 4h (outside the flat plate portion 4p) is as shown by the one-dot chain line in FIG. Then, intake, compression, and exhaust are performed inside the cylinder 4 configured as described above.

(piston)
The four pistons 5 are disposed inside each of the four cylinders 4 (see FIGS. 3 to 7 and the like). In the reciprocating compressor 1 according to the present embodiment, four pistons 5 are provided corresponding to the four cylinders 4. Each piston 5 has a piston head 5h, a connecting portion 5c, and a ring portion 5r as shown in FIG.

  The four pistons 5 are assembled in a state as shown in FIG. Specifically, as shown in FIG. 21, the ring portions 5 r of the four pistons 5 are sequentially inserted into the eccentric shaft 17, and the balance weight 18 is further inserted.

(Bearing support part)
14-16 is arrange | positioned at the shaft end part 2t of the motor shaft 2s (refer FIG. 3-5, FIG. 25). The bearing support portion 10 supports the motor shaft 2s so as to be rotatable via the bearing 22, and the integrated discharge flow path 8 is formed in the bearing support portion 10 (FIGS. 14 to 14). 16). A bearing hole 10k is formed at the center of the bearing support portion 10, and the shaft end 2t of the motor shaft 2s is fitted in the bearing hole 10k (see FIG. 3). Further, the side portions of the bearing support portion 10 are formed with protruding portions 10w and 10z extending along the axial direction of the motor shaft 2s (when assembled as the reciprocating compressor 1) at positions facing each other. Each of the projecting portions 10w and 10z is formed with a discharge port 10h and a casing internal cooling suction port 10j (see FIGS. 14 to 16). The compressed air integrated in the integrated discharge flow path 8 is finally discharged from the discharge port 10h (see FIG. 16 (a)). Also, air for cooling the inside of the casing 3 is sent from the casing internal cooling inlet 10j. Further, two discharge inlets 10 i are formed at the corners of the bearing support portion 10, and the discharge inlets 10 i constitute a part of the discharge flow path 7. Further, the two discharge inlets 10i are formed so as to be connected to the integrated discharge passage 8 respectively, and the discharge passage 7 is connected to the integrated discharge passage 8 via the discharge inlet 10i. It is continuous (see FIGS. 4 and 16, etc.).

(Integrated discharge flow path)
The integrated discharge flow path 8 formed inside the bearing support portion 10 is for integrating the plurality of discharge flow paths 7, and is an annular flow centered on the axial region 31 along the axial direction of the motor shaft 2s. It is formed as a path (see FIG. 26). And the integrated discharge flow path 8 is arrange | positioned so that the peripheral area | region 32 of the axial area | region 31 along the axial direction of the motor shaft 2s may overlap. Details of this arrangement will be described later. The integrated discharge flow path 8 formed as an annular flow path is formed so as to spread in a plane along a plane 33 perpendicular to the axial direction of the motor shaft 2s (see FIGS. 14 and 26). Further, the integrated discharge flow path 8 becomes a space closed by a combination of the bearing support portion 10 and a casing cover 15 described later (see FIGS. 3 to 5). The integrated discharge channel may not be an annular channel. Further, in the present embodiment, the center of the circle of the integrated discharge flow path 8 coincides with the center of the motor shaft 2s, thereby enabling a balanced arrangement with the motor shaft 2s as the center from the viewpoint of miniaturization. However, when the integrated discharge channel is annular, the center of the circle of the integrated suction channel may not coincide with the center of the motor shaft, and the center may be shifted. In the present embodiment, the integrated discharge flow path 8 formed as an annular flow path is formed so as to spread in a plane along a plane 33 perpendicular to the axial direction of the motor shaft 2s. It is not limited to this, and may be formed so as to spread in a plane along a plane inclined with respect to the plane 33, or not formed so as to spread in a plane, for example, formed so as to extend in the axial direction. May be. Further, the integrated discharge flow path may not be formed in the bearing support portion, and for example, a member for an integrated discharge flow path different from a member such as the bearing support portion may be provided separately. By providing the integrated discharge flow path 8 in the bearing support portion 10 as in this embodiment, an increase in the number of parts can be prevented.

  In the present embodiment, only the integrated discharge flow path 8 is formed in the bearing support portion 10, but at least one of the integrated discharge flow path and the integrated suction flow path is formed in the bearing support portion. What is necessary is just and it is not restricted to such a structure. For example, only the integrated suction flow path may be formed in the bearing support section, or both the integrated discharge flow path and the integrated suction flow path may be formed in the bearing support section.

(Regarding the positional relationship between the integrated suction flow path and the integrated discharge flow path)
Next, the positional relationship between the integrated suction flow path 9 and the integrated discharge flow path 8 will be described with reference to FIG. First, the integrated suction flow path 9 and the integrated discharge flow path 8 are disposed on both sides of the four cylinders 4 in the axial direction of the motor shaft (see FIGS. 3 to 5). With respect to the axial direction of the motor shaft 2s, the integrated discharge flow path 8 is disposed on the shaft end 2t side of the motor shaft 2s, and the integrated suction flow path 9 is disposed on the main body 2b side.

  Further, the integrated suction flow path 9 and the integrated discharge flow path 8 are formed in an annular shape, and the center of these circles coincides with the center of the circle of the motor shaft 2s. Further, both the integrated suction flow path 9 and the integrated discharge flow path 8 are arranged so as to overlap at least one of the shaft region 31 and the peripheral region 32 along the axial direction of the motor shaft. Here, “overlapping” means that the integrated suction flow path 9 or the integrated discharge flow path 8 is disposed so as to be within a region composed of the shaft region 31 and the peripheral region 32, as shown in FIG. is doing. And the integrated suction flow path 9 and the integrated discharge flow path 8 are settled in the width | variety (refer width W1 of FIG. 26) of the area | region which consists of the axial area | region 31 and the peripheral area | region 32 regarding the radial direction. In the present embodiment, W1 is approximately the size of the diameter of the eye flange 16. Further, it is more desirable that the integrated suction flow path and the integrated discharge flow path be within the width of the main body 2b of the motor 2 (see width W2 in FIG. 26). The integrated discharge flow path 8 according to the present embodiment is within this width, and by doing so, it is possible to suppress an increase in the size of the compressor in the radial direction perpendicular to the axial direction. Further, the integrated suction flow path 9 and the integrated discharge flow path 8 have a portion overlapping the motor shaft 2s with respect to the axial position. For this reason, the enlargement of the compressor can also be suppressed in the axial direction.

  In the present embodiment, the integrated discharge flow path 8 is disposed on the shaft end 2t side of the motor shaft 2s, and the integrated suction flow path 9 is disposed on the main body 2b side. And either one of the integrated discharge flow paths 8 should just be arrange | positioned at the shaft end part 2t side of the motor shaft 2s, and the other should just be arrange | positioned at the main-body part 2b side, and this arrangement | positioning may be reverse. . Further, the integrated discharge flow path and the integrated suction flow path may not be arranged on both sides of the cylinder 4, and the same side with respect to the cylinder 4 with respect to the axial direction of the motor shaft 2 s without sandwiching the cylinder 4. An integrated discharge flow path and an integrated suction flow path may be disposed in the slab.

In the present embodiment, both the integrated suction flow path 9 and the integrated discharge flow path 8 are disposed inside the peripheral region 32. However, at least one of the integrated suction flow path and the integrated discharge flow path is used. Any one of them may be arranged so as to overlap at least one of the shaft region 31 along the axial direction of the motor shaft and the peripheral region 32 thereof. Only one of them falls within the region composed of the axial region 31 and the peripheral region 32 (within the range of the width W1 with respect to the radial direction), and the other does not fit within the region composed of the axial region 31 and the peripheral region 32 and protrudes. In addition, the integrated discharge flow path or the integrated suction flow path that is not annular does not overlap the motor shaft 2s in the motor shaft direction, and overlaps the shaft region 31 and the peripheral region 32. (With respect to the radial direction so as to fall within the width W1) may be disposed.
(Suction channel)
Next, the plurality of suction passages 6 will be described. As described above, the plurality of suction flow paths 6 are formed so as to pass through the inside of the second member 3s, and the plurality of suction flow paths 6 are formed so that fluid can flow therethrough. Yes. Further, the plurality of suction flow paths 6 are connected to the insides (compression chambers 4j) of the four cylinders 4 (see the alternate long and short dash line portion showing the suction flow paths 6 in FIG. 6).

First, air enters the inside of the second member 3s from the suction port 3z of the second member 3s, and flows into the integrated suction channel 9 from there (see FIGS. 4 and 10). Hereinafter, each suction flow path 6, that is, the flow path to the inside of the cylinder 4 (compression chamber 4j) will be described. The inside of the second member 3s is formed so that the integrated suction flow path 9 continues to the two second parallel portions 6f, and the air in the integrated suction flow path 9 flows to the two second parallel portions 6f. (See FIGS. 5 and 10). And the air which passed each 2nd parallel part 6f is sent to the 1st room 4n through the through-hole 4b from the suction outlet 3y (refer FIG.6, 10 grade | etc.,). Then, the air in the first chamber 4n is sent to the compression chamber 4j through the through hole 4c. One suction flow path 6 is configured as described above.
(Discharge flow path)
Next, the plurality of discharge channels 7 will be described. As described above, the plurality of discharge passages 7 are formed so as to pass through the inside of the first member 3f, and fluid (air in the present embodiment) flows through the inside of the plurality of discharge passages 7. It is formed to be possible. Moreover, the some discharge flow path 7 is connected with respect to each inside (compression chamber 4j) of the four cylinders 4 (refer the dashed-dotted line part which shows the discharge flow path 7 of FIG. 4).

  Hereinafter, each discharge flow path 7, that is, the flow path from the inside of the cylinder 4 (compression chamber 4j) to the discharge port 10h will be described. First, the air compressed in the compression chamber 4j inside the cylinder 4 passes through the through hole 4f, passes through the inside of the second chamber 4k, and enters the through hole 4g (see FIG. 18). Then, the compressed air that has passed through the through hole 4g is sent to the discharge inlet 3x of the first member 3f, and from there to the first parallel portion 7f (see FIG. 7). Then, the compressed air passes through the first parallel portion 7f and enters the discharge inlet 10i of the bearing support portion 10 (see FIG. 4). One discharge flow path 7 is configured as described above. Then, the compressed air that has flowed in from the plural (four) discharge channels 7 flows into the integrated discharge channel 8 via the discharge inlet 10i (see FIG. 16), and finally from the discharge port 10h. Discharged.

  In the present embodiment, the reciprocating compressor 1 is configured to include four discharge passages 7 and four suction passages 6. Here, as described above, in the four discharge passages 7, the first parallel portion 7f is a passage common to the two discharge passages 7, and in the four suction passages 6, the second parallel portion 6f is This is a common channel for the two suction channels 6. As described above, the plurality of discharge channels 7 and the plurality of suction channels 6 each have a common channel, but the number of the discharge channels 7 and the suction channels 6 is the same. Shall be treated as four each.

(Assembling the reciprocating compressor)
Next, assembly of the reciprocating compressor 1 will be described. First, the eye flange 16 and the casing 3 (first member 3f, second member 3s) are attached to the motor 2 (see FIG. 22). Here, between the eye flange 16 and the second member 3s, rubber O-rings 20c and 20d for securing air tightness are attached (see FIGS. 22 and 3 to 5). The eye flange 16 is provided for assembling the motor 2 and the casing 3 and as a fixed support portion when the reciprocating compressor 1 is attached to the housing of the oxygen concentrator. Therefore, as in this embodiment, the annular portion 3t of the second member 3s is configured to match the size of the eye flange 16, thereby ensuring the necessary size as the fixed support portion and increasing the size of the compressor. Can be suppressed.

  Next, four pistons 5 are attached (see FIG. 23). Here, the four pistons 5 are inserted into the eccentric shaft 17 together with the balance weight 18 as shown in FIG.

  Next, four cylinders 4 are attached (see FIG. 24). Specifically, a cylinder 4 is attached so as to cover each piston 5, and a head cover 4 h is attached to the cylinder 4. Further, the cylinder 4 here is in a state where the intake valve 4v and the exhaust valve 4w described above with reference to FIG. 18 are attached, and airtightness is ensured between the cylinder 4 and the head cover 4h. A cylinder packing 20e is attached. The head cover 4h is attached to the cylinder 4 using a plurality of fixing bolts 20h and 20i. Further, an O-ring 20f for securing airtightness is attached to the discharge inlet 3x. In FIG. 24, only one cylinder 4 is shown.

  Next, the bearing support portion 10, the casing cover 15 and the like are attached (see FIG. 25). Specifically, the shaft holder 21 is inserted into the motor shaft 2s, the bearing 22 is inserted into the shaft holder 21, and the bearing support portion 10 and the casing cover 15 are fixed to each other using a plurality of fixing bolts 20p. It attaches with respect to 1 member 3f. Here, two O-rings 20j for securing airtightness are attached between the first parallel portion 7f of the first member 3f and the discharge inlet 10i of the bearing support portion 10, and the bearing support portion 10 and the casing are attached. Between the cover 15, a packing 20m and an O-ring 20n for securing airtightness are attached. FIG. 25 shows a state where three cylinders 4 are attached and one cylinder 4 is not yet attached. And the reciprocating compressor 1 shown in FIG. 1 is assembled as mentioned above.

[Features of the present invention]
The reciprocating compressor 1 according to the present embodiment has the following characteristics.

  In the reciprocating compressor 1 of the present embodiment, a motor 2 having a motor shaft 2 s, a casing 3 that houses the motor shaft 2 s, four cylinders 4, and four cylinders 4 disposed in each of the four cylinders 4. The piston 5 is connected to the inside of each of the four cylinders 4 and is connected to the inside of each of the four cylinders 4 and the four suction passages 6 through which fluid can flow. , Four discharge flow paths 7 through which fluid can circulate, an integrated suction flow path 9 for integrating the four suction flow paths 6, and an integrated discharge flow path for integrating the four discharge flow paths 7 8, each of the four cylinders 4 is arranged such that the cylinder axis direction is along a direction orthogonal to the axial direction of the motor shaft 2 s, and the integrated suction flow path 9 and the integrated cylinder are integrated. The discharge channel 8 is a shaft of the motor shaft 2s. It is arranged so as to overlap the peripheral area 32 of the shaft region 31 along the direction. As a result, the flow path between the plurality of cylinders can be integrated by providing at least one of the integrated suction flow path 9 and the integrated discharge flow path 8. Further, at least one of the integrated suction flow path 9 and the integrated discharge flow path 8 is disposed so as to overlap with at least one of the shaft region 31 along the axial direction of the motor shaft 2s and the peripheral region 32 thereof. Therefore, it is possible to prevent the entire compressor from being enlarged by providing the integrated flow path. As a result, with this configuration, it is possible to integrate the flow paths between the plurality of cylinders while suppressing an increase in size.

  In the present embodiment, four cylinders 4, four pistons 5, four suction flow paths 6, and four discharge flow paths 7 are provided. It is not limited to.

  Further, in the reciprocating compressor 1 of the present embodiment, the integrated suction flow path 9 and the integrated discharge flow path 8 are formed as annular flow paths centering on the shaft region 31. Thus, by making an integrated flow path into an annular flow path, the flow paths can be gathered in a compact manner, and an increase in size can be easily suppressed. In particular, by making the integrated discharge channel 8 annular, a heat radiation area of the fluid can be secured and the compression efficiency is improved.

  Further, in the reciprocating compressor 1 of the present embodiment, the integrated discharge flow path 8 formed as an annular flow path is formed so as to spread in a plane along a plane perpendicular to the axial direction of the motor shaft 2s. . For this reason, while suppressing the enlargement of the compressor by the integrated discharge flow path 8, the thermal radiation area of a fluid is easily securable for a compression efficiency improvement.

  Further, the reciprocating compressor 1 of the present embodiment further includes a bearing support portion 10 disposed at the shaft end 2t of the motor shaft 2s, and the integrated discharge flow path 8 is formed in the bearing support portion 10. Yes. For this reason, by effectively utilizing the bearing support member and the space around it, the flow paths between the plurality of cylinders can be integrated while efficiently suppressing an increase in size.

  Moreover, in the reciprocating compressor 1 of this embodiment, each of the four discharge flow paths 7 has the 1st parallel part 7f along the axial direction of the motor shaft 2s. Thus, the discharge flow path 7 can be efficiently arrange | positioned because the discharge flow path 7 has the part along the axial direction of the motor shaft 2s.

  In the reciprocating compressor 1 of the present embodiment, the first parallel portion 7 f is formed inside the casing 3. In this way, by forming the first parallel portion 7f of the discharge flow path 7 inside the casing 3, there is no need to separately provide a member for forming a flow path such as a pipe, or a flow that is separately required. Since the number of members for forming the path can be reduced, the discharge flow path can be arranged more efficiently by reducing the number of parts while suppressing an increase in size of the compressor. Moreover, since the casing 3 itself becomes a heat radiating portion, the heat radiating area can be greatly increased, and the compression efficiency is further improved.

  Further, in the reciprocating compressor 1 of the present embodiment, the motor 2 has a main body portion 2b, and the integrated suction flow path 9 and the integrated discharge flow path 8 have four cylinders 4 with respect to the axial direction of the motor shaft 2s. The integrated discharge flow path 8 is disposed on the shaft end 2t side of the motor shaft 2s, and the integrated suction flow path 9 is disposed on the main body 2b side. For this reason, it is possible to efficiently arrange both the integrated suction channel 9 and the integrated discharge channel 8 while suppressing an increase in the size of the compressor. Further, by separating the integrated suction flow path 9 and the integrated discharge flow path 8, heat can be prevented from being transmitted between them, and the compression efficiency is further improved.

  In the reciprocating compressor 1 of the present embodiment, each of the plurality of suction flow paths 6 has a second parallel portion 6f along the axial direction of the motor shaft 2s. Thus, in this reciprocating compressor 1, since the suction flow path 6 has a portion along the axial direction of the motor shaft 2s, the suction flow path 6 can be arranged efficiently.

  Further, in the reciprocating compressor 1 of the present embodiment, the casing 3 includes the first member 3f and the second member 3s, and the plurality of discharge flow paths 7 pass through the inside of the first member 3f. The plurality of suction passages 6 are formed so as to pass through the inside of the second member 3s, the first member 3f and the second member 3s are formed as separate bodies, and the second member The thermal conductivity of the first member 3f is higher than the thermal conductivity of 3s. Thus, each of the suction flow path 6 and the discharge flow path 7 is formed inside the separate second member 3s and first member 3f, and heat conduction is performed between the first member 3f and the second member 3s. Since the rates are different, the heat of the discharge channel 7 can be prevented from being transmitted to the suction channel 6, and the compression efficiency is further improved. In the present embodiment, since the first member 3f is made of metal and has high thermal conductivity, the fluid is efficiently radiated and the compression efficiency is further improved.

  In the present embodiment, the four pistons 5 are attached so as to be sequentially arranged along the motor shaft direction with respect to one motor shaft 2s with the direction of each piston head 5h being shifted by 90 degrees. Therefore, the cylinder 4 closest to the main body 2b of the motor 2 (corresponding to the piston 5 on the main body side) is the motor shaft 2s of the cylinder 4 in the casing 3, the bearing support 10 and the wall of the casing cover 15. The space on the shaft end portion 2t side is wider than that of the cylinder 4 (corresponding to the piston 5 on the shaft end portion side) farthest from the main body portion 2b. And in reciprocating compressor 1, discharge port 10h is formed using the space (refer to Drawings 1, 2, and 3). Therefore, the discharge port 10h is located at a position close to the integrated discharge flow path 8 inside the bearing support portion 10 without requiring other parts, and at an unobtrusive appropriate position that does not cause an increase in size. Can be arranged.

(Second Embodiment)
Next, a reciprocating compressor according to a second embodiment of the present invention will be described with a focus on differences from the above embodiment. In addition, about the part similar to said embodiment, the same code | symbol is attached | subjected to a figure and the description is abbreviate | omitted. 27A and 27B are schematic views showing a reciprocating compressor according to a second embodiment of the present invention, where FIG. 27A is a schematic top view and FIG. 27B is a schematic side view as viewed from the Y direction. FIG. 28 is a schematic cross-sectional view taken along the line PP in FIG. 29 is a schematic cross-sectional view taken along the line QQ in FIG. FIG. 30 is a schematic cross-sectional view taken along the line RR in FIG. FIG. 31 is a schematic cross-sectional view taken along the line S-S in FIG.

  The reciprocating compressor 101 according to this embodiment is different from the above embodiment in that the casing 103 does not have a member corresponding to the second member of the above embodiment. Specifically, a first parallel portion 7f and a second parallel portion 106f are formed inside a metal member corresponding to the first member 3f. And the position of a through-hole etc. is changed also about the cylinder 104 with the casing 103 differing from said embodiment (illustration is abbreviate | omitted).

  Each of the plurality of discharge flow paths 7 in the reciprocating compressor 101 has a first parallel portion 7f along the axial direction of the motor shaft 2s (similar to the above embodiment. FIG. 27A and FIG. 27). 30). Each of the plurality of suction flow paths 106 has a second parallel portion 106f along the axial direction of the motor shaft (see FIGS. 27A and 31).

  A pair of first parallel portions 7f and a pair of second parallel portions 106f are formed inside the casing 103, and the pair of first parallel portions 7f are disposed to face each other with the motor shaft 2s interposed therebetween. The pair of second parallel portions 106f are arranged opposite to each other with the motor shaft 2s interposed therebetween (see the dashed line portion in FIG. 27A). The pair of first parallel portions 7f and the pair of second parallel portions 106f are arranged such that the first parallel portion 7f and the second parallel portion 106f are adjacent to each other (FIG. 27A, FIG. 30 and 31).

  In addition, unlike the above-described embodiment, the casing 103 has four suction outlets 103y corresponding to the first member in the above-described embodiment (see FIG. 31). And the integrated suction flow path 109 is formed in the space inside the casing 103 in the main body 2b side with respect to the piston 5 in the motor axial direction (see FIGS. 28 to 31). And the suction port 103z to this integrated suction flow path 109 is formed in the outer wall part of the casing 103 (refer FIG. 29).

  In the reciprocating compressor 101 configured as described above, the discharge flow path 7 is substantially the same as that in the above embodiment, but the suction flow path 106 is different from that in the above embodiment. The plurality of suction channels 106 are formed so as to pass through the inside of the casing 103, and specifically, the second parallel portion 106 f is formed inside the casing 103. The plurality of suction channels 106 are connected to the insides (compression chambers 4j) of the plurality of cylinders 104 (see the alternate long and short dash line portion showing the suction channels 106 in FIG. 31).

  First, air enters the inside of the casing 103 from the suction port 103z formed in the casing 103, and flows into the integrated suction passage 109 therefrom (see FIG. 29). Hereinafter, each suction flow path 106, that is, a flow path to the inside of the cylinder 104 (compression chamber 4j) will be described. The inside of the casing 103 is formed so that the integrated suction flow path 109 continues to the two second parallel portions 106f, and the air in the integrated suction flow path 109 is sent to the two second parallel portions 106f. (See FIG. 31). And the air which passed each 2nd parallel part 106f is sent to a 1st room through the through-hole (what is corresponded to the through-hole 4b in the said embodiment) from the suction outlet 103y. The air in the first chamber is sent to the compression chamber 4j through the through hole 4c. One suction channel 106 is configured as described above.

  As described above, in the reciprocating compressor 101 of the present embodiment, each of the plurality of discharge flow paths 7 has the first parallel portion 7f along the axial direction of the motor shaft 2s, and the plurality of suction flow paths 106. Each has a second parallel portion 106f along the axial direction of the motor shaft 2s, and a pair of first parallel portions 7f and a pair of second parallel portions 106f are formed inside the casing 103. The pair of first parallel portions 7f are disposed to face each other with the motor shaft 2s interposed therebetween, and the pair of second parallel portions 106f are disposed to face each other with the motor shaft 2s interposed therebetween. In this way, by forming both the first parallel portion 7f of the discharge flow channel 7 and the second parallel portion 106f of the suction flow channel 106 inside the casing 103, the casing 103 can be effectively used without waste, and further It is possible to integrate the flow paths between a plurality of cylinders while efficiently suppressing an increase in size.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above embodiment, both the integrated suction flow path and the integrated discharge flow path are provided, but it is sufficient that at least one of these is provided. One of the integrated discharge channels may be omitted.

  Further, in the above embodiment, the discharge flow path has a first parallel portion along the axial direction of the motor shaft, and the suction flow path has a second parallel portion along the axial direction of the motor shaft. However, the first and second parallel portions may not be provided in the discharge channel and the suction channel. Further, only one of the first parallel part and the second parallel part may be formed in the discharge flow path and the suction flow path.

  In the present embodiment, a reciprocating compressor having four cylinders is described. However, as described above, the number of cylinders is not limited to this as long as it is plural, and the number of cylinders is not limited. Two, six, eight, etc. may be sufficient. Here, when the number of cylinders is 5 or more, the arrangement of the cylinders for each wall portion is increased by two or three in the motor shaft direction in a front view (for example, FIG. 2 (c)). (In FIG. 2C, only one stage).

  In the present embodiment, the fluid sucked into the reciprocating compressor is air, but the reciprocating compressor sucks other gas fluid (for example, nitrogen, oxygen, carbon dioxide, refrigerant, etc.), It may be configured to compress.

  If this invention is utilized, the reciprocating compressor which can integrate the flow path between several cylinders, suppressing enlargement will be obtained.

1 is a schematic perspective view showing a reciprocating compressor according to a first embodiment of the present invention. It is the schematic of the reciprocating compressor of FIG. 1, (a) is a top view schematic diagram, (b) is a X arrow side view schematic, (c) is a Y arrow side view schematic. FIG. 3 is a schematic cross-sectional view taken along arrow AA in FIG. FIG. 3 is a schematic cross-sectional view taken along the line BB in FIG. It is CC sectional view schematic drawing of Fig.2 (a). FIG. 3 is a schematic cross-sectional view taken along the line DD in FIG. It is the EE arrow cross-sectional schematic of FIG. It is a Z perspective view schematic perspective view of FIG. It is a perspective schematic diagram which shows the 2nd member in the casing of FIG. It is the schematic of the 2nd member of FIG. 9, (a) is TU-V combination sectional drawing of (b), (b) is a top view schematic diagram, (c) is a X arrow side view schematic diagram, d) is a schematic side view as viewed in the direction of arrow Y, and (e) is a JJ cross-sectional view. It is a perspective schematic diagram which shows the 1st member in the casing of FIG. It is the schematic of the 1st member of FIG. 11, (a) is a schematic top view, (b) is a schematic side view as viewed from the X arrow, (c) is a schematic diagram from the bottom, and (d) is a schematic side view from the Y arrow. FIG. 5E is a cross-sectional view taken along line HH. FIG. 12 is a cross-sectional view of the first member in FIG. 11, (a) is a schematic cross-sectional view taken along line FF in FIG. 12, and (b) is a schematic cross-sectional view taken along line GG in FIG. 12. It is a perspective schematic diagram which shows the bearing support member of FIG. It is the schematic of the bearing support member of FIG. 14, (a) is a bottom view schematic diagram, (b) is a NN arrow cross-sectional schematic diagram, (c) is a MM arrow cross-sectional schematic diagram. It is the schematic of the bearing support member of FIG. 14, (a) is front view schematic, (b) is OO arrow cross-sectional schematic. It is the schematic of the cylinder of FIG. 1, (a) is the schematic of the side view of the arrow X of (b), (b) is the schematic diagram of the front view, (c) is the schematic sectional view of the KK arrow. It is a perspective explanatory view which shows the components attached to the cylinder of FIG. 1 with a cylinder. FIG. 2 is a schematic perspective view showing the head cover of FIG. 1. FIG. 20 is a schematic diagram of the head cover of FIG. 19, (a) is an internal schematic diagram, (b) is a schematic side view as viewed from the X direction, (c) is a schematic diagram of the external surface, and (d) is a schematic diagram of a cross section taken along the line LL is there. It is a decomposition explanatory drawing which shows the piston inside the reciprocating compressor of FIG. FIG. 2 is a schematic perspective view for explaining attachment of a casing in the assembly of the reciprocating compressor of FIG. 1. It is a perspective explanatory view for explaining attachment of a piston in the assembly of the reciprocating compressor of FIG. It is a perspective explanatory view for explaining attachment of a cylinder etc. in the assembly of the reciprocating compressor of FIG. It is a perspective explanatory view for explaining attachment of a bearing support part, a casing cover, etc. in the assembly of the reciprocating compressor of FIG. FIG. 2 is an explanatory schematic diagram for explaining a shaft region and its peripheral region in the reciprocating compressor of FIG. 1. It is the schematic which shows the reciprocating compressor which concerns on 2nd Embodiment of this invention, (a) is a top view schematic diagram, (b) is a Y arrow side view schematic diagram. It is PP sectional view schematic of FIG.27 (b). It is QQ arrow sectional schematic drawing of FIG. It is the RR arrow cross-sectional schematic of Fig.27 (a). It is SS sectional view schematic drawing of Fig.27 (a).

1,101 reciprocating compressor 2 motor 2b main body 2s motor shaft 2t shaft end 3,103 casing 3d motor through-hole 3f first member 3r groove 3s second member 3t annular portion 3u suction projection 3v columnar portion 3w Reinforcing section 3x Discharge inlet 3y, 103y Suction outlet 3z, 103z Suction port 4, 104 Cylinder 4h, 104h Head cover 5 Piston 6, 106 Suction flow path 6f, 106f Second parallel section 7 Discharge flow path 7f First parallel section 8 Integrated discharge flow path 9, 109 Integrated suction flow path 10 Bearing support portion 10h Discharge port 10i Discharge inlet 10j Casing internal cooling suction port 15 Casing cover 16 Eye flange 17 Eccentric shaft 18 Balance weight 21 Shaft holder 22 Bearing 31 Shaft region 32 Peripheral area 33 Plane perpendicular to the axial direction

Claims (11)

A motor (2) having a motor shaft (2s);
A casing (3) for housing the motor shaft;
A plurality of cylinders (4);
A plurality of pistons (5) disposed inside each of the plurality of cylinders;
A plurality of suction passages (6) connected to the inside of each of the plurality of cylinders and capable of circulating a fluid therein;
A plurality of discharge passages (7) connected to the inside of each of the plurality of cylinders and capable of circulating a fluid therein;
And at least one of an integrated suction channel (9) for integrating the plurality of suction channels and an integrated discharge channel (8) for integrating the plurality of discharge channels,
Each of the plurality of cylinders is arranged such that a cylinder axial direction is along a direction orthogonal to the axial direction of the motor shaft,
At least one of the integrated suction flow path and the integrated discharge flow path is a shaft region (31) on the extension line of the motor shaft, and outside the shaft region and inside the outer peripheral portion of the casing. Arranged so as to overlap with at least one of the peripheral region (32),
At least one of the plurality of discharge channels is a common channel for fluid discharged from adjacent cylinders and / or
Wherein at least one of the plurality of intake passages, Ri Do a common flow path for fluid supplied to the adjacent the cylinder,
The discharge flow path serving as a common flow path for fluids is disposed between adjacent cylinders, and the suction flow path serving as a common flow path for fluids is disposed between adjacent cylinders. A reciprocating compressor characterized in that the reciprocating compressor is disposed between adjacent cylinders in which the discharge flow path serving as a common flow path is not disposed . The plurality of cylinders are composed of four cylinders arranged so as to be shifted by approximately 90 degrees in plan view,
A pair of the discharge passages arranged to face each other with the motor shaft interposed therebetween is between the first cylinder and the second cylinder adjacent to each other in the rotation direction of the motor shaft and adjacent to the rotation direction of the motor shaft. Disposed between the third and fourth cylinders,
The pair of suction flow paths arranged opposite to each other with the motor shaft interposed therebetween are adjacent to each other between the second cylinder and the third cylinder adjacent to each other in the rotation direction of the motor shaft and to the rotation direction of the motor shaft. The reciprocating compressor according to claim 1 , wherein the reciprocating compressor is disposed between a fourth cylinder and a first cylinder. 3. The reciprocating motion according to claim 1, wherein at least one of the integrated suction flow path and the integrated discharge flow path is formed as an annular flow path centering on the axial region. Compressor. The reciprocation according to claim 3 , wherein the integrated discharge flow path formed as the annular flow path is formed so as to spread in a plane along a plane perpendicular to the axial direction of the motor shaft. Dynamic compressor. The reciprocating compressor according to any one of claims 1 to 4 , wherein each of the plurality of discharge flow paths has a first parallel portion (7f) along an axial direction of the motor shaft. . The reciprocating compressor according to claim 5 , wherein the first parallel part is formed inside the casing. The motor has a main body,
The integrated suction channel and the integrated discharge channel are arranged on both sides of the plurality of cylinders with respect to the axial direction of the motor shaft,
One of the integrated suction flow path and the integrated discharge flow path is disposed on the shaft end side of the motor shaft, and the other is disposed on the main body side. The reciprocating compressor according to any one of 1 to 6 . The reciprocating compressor according to any one of claims 1 to 7 , wherein each of the plurality of suction flow paths has a second parallel portion (6f) along an axial direction of the motor shaft. . The casing includes a first member (3f) and a second member (3s),
The plurality of discharge channels are formed to pass through the inside of the first member,
The plurality of suction channels are formed to pass through the inside of the second member,
The first member and the second member are formed as separate bodies, and the thermal conductivity of the first member is higher than the thermal conductivity of the second member. The reciprocating compressor of any one of thru | or 8 . Each of the plurality of discharge passages has a first parallel portion (7f) along the axial direction of the motor shaft, and each of the plurality of suction passages is a first portion along the axial direction of the motor shaft. 2 parallel parts (106f),
A pair of the first parallel parts and a pair of the second parallel parts are formed inside the casing (103),
The pair of first parallel portions are disposed to face each other with the motor shaft interposed therebetween, and the pair of second parallel portions are disposed to face each other with the motor shaft interposed therebetween. The reciprocating compressor according to any one of claims 1 to 8 . A bearing support (10) disposed at the shaft end of the motor shaft;
The reciprocating compression according to any one of claims 1 to 10 , wherein at least one of the integrated discharge flow path and the integrated suction flow path is formed in the bearing support portion. Machine.

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