JP4833110B2 - Fluid reciprocating sliding type suction and discharge device - Google Patents

Description

  According to the present invention, a piston fitted in a cylinder is reciprocated by reciprocating motion or reciprocating vibration in the axial direction, and with each movement, the piston sucks in fluid outside the cylinder and performs compression and discharge. The present invention relates to a fluid reciprocating sliding type suction and discharge device.

  The drive shaft that is integrated with the piston disposed in the housing or the drive shaft that connects the piston fitted in the cylinder that is axially opposed to the housing is mechanically reciprocated or electromagnetically reciprocated. A fluid reciprocating sliding type suction / discharge device is known in which gas or liquid outside the cylinder is sucked by a piston and compressed and discharged by a piston (see Patent Document 1).

  FIG. 10 is a longitudinal sectional front view schematically showing a linear vibration type compressor as an example of a conventional fluid reciprocating sliding type suction / discharge device described in Patent Document 1. As shown in FIG.

  The terms used in this specification, the inner surface and the outer surface, the inner periphery and the outer periphery, and the inward and outward directions, unless otherwise specified, refer to the radial direction, and other inward and outward, that is, inward and outward, inner surface and outer surface. The side surface, the inner end, the outer end, and the like are referred to in the axial direction from the center of the object.

  On the inner side surfaces of the left and right end walls 22, 22 of the housing 21 having a rectangular tube shape, a cylinder 23 facing inward is fixed in a coaxial manner.

  The inner end of each cylinder 23 in the axial direction is hermetically fixed to an annular partition wall 24 projecting inward from the housing 21, and between the housing 21, the end wall 22, the cylinder 23, and the annular partition wall 24. An air guide chamber 25 is formed.

  In the central portion of the housing 21 in the axial direction, magnetic yokes 27 are fitted and fixed in radial fitting holes 26 and 26 provided on the upper and lower surfaces thereof.

  A horizontal coil 28 is externally fitted to the magnetic yoke 27, and an inwardly arcuate permanent magnet 29 is fixed to the inner peripheral surface of the magnetic yoke 27.

  The center portions of the left and right pistons 30, 30 fitted in the cylinder 23 are connected by a drive shaft 31. A piston ring 33 is fitted in the ring groove 32 on the outer periphery of the piston 30.

  As is well known and as shown in FIG. 11, the piston ring 33 has complementary square-shaped uneven portions 33a, 33b or so that the ends of the notch ring enter and engage with each other. It is a mutually engaging slope.

  A movable iron core 34 is secured to the inner surface of the permanent magnet 29 at a central portion in the longitudinal direction of the drive shaft 31 with a small gap.

  A plurality of axial suction holes 35, 35 are formed radially outward from the center of each piston 30 and at a certain radius.

  A circular suction plate valve 36 having a slightly smaller diameter than the piston 30 and capable of closing or opening the suction holes 35, 35 is in contact with the outer surface of each piston 30. 36 a is fitted into a circular support protrusion 30 a formed at the center of the outer surface of the piston 30.

  The suction plate valve 36 is brought into contact with the outer surface of the piston 30 by screwing a tightening screw 37 inserted into the center thereof from the outside into the outer end surface of the drive shaft 31.

  A discharge hole 39 having a plate-like discharge valve 38 is formed on the outer surface near the outer end of each cylinder 23.

  On the outer side and the inner side of the annular partition wall 24, an outlet hole 40 and an inlet hole 41 are formed in the housing 21, respectively.

  When the coil 28 is energized to linearly vibrate the drive shaft 31 together with the movable iron core 34, the left and right pistons 30 and 30 reciprocate so that one is in the suction stroke and the other is in the compression and discharge strokes.

  Accordingly, the outside air is sucked into the housing 21 from the inlet hole 41 and then introduced into the compression chamber 23a through the suction hole 35 and the suction plate valve 36 of the piston 30, and the discharge hole 39 and the discharge valve 38 of the cylinder 23. Then, the gas is discharged into the air guide chamber 25 and discharged from the outlet hole 40.

  In the conventional fluid reciprocating sliding suction / discharge device as shown in FIG. 10, the left side operating part will be described. The outside air that has flowed into the housing 21 from the inlet hole 41 moves forward ( In FIG. 10, along the movement from the left to the right), the peripheral portion of the suction plate valve 36 is deformed outward through the suction hole 35 in the piston 30, and is sucked away from the outer surface of the piston 30. The hole 35 is opened and introduced into the compression chamber 23a.

As the drive shaft 31 moves backward (movement in the direction from right to left in FIG. 10), the suction plate valve 36 is elastically restored, the suction hole 35 is closed, and the outside air introduced into the compression chamber 23a is After being compressed, the discharge valve 38 is opened from the discharge hole 39, discharged into the air introduction chamber 25, and then discharged from the outlet hole 40.
The same applies to the right operating part.

  Therefore, the suction plate valve 36 may be deformed excessively with the fastening screw 37 as a base point, and may return in a timely manner so that the suction hole 35 is not properly closed in a timely manner. Further, if the suction plate valve 36 is deformed excessively, excessive repetitive stress concentrates on the attachment portion of the suction plate valve 36 by the central tightening screw 37, and the suction plate valve 36 is damaged or deteriorated, or becomes permanent. It may be deformed, and tightening with the tightening screw 37 may be defective.

  In order to cope with such a problem, the applicant of the present application previously proposed an invention in which a suction plate valve deformation limiting member for preventing the suction plate valve 36 from being excessively deformed is attached (Patent Document 2).

However, when this suction plate valve deformation limiting member is attached, the suction plate valve 36 is unlikely to be separated from the suction plate valve deformation limiting member due to grease or the like adhering to the surface of the suction plate valve deformation limiting member. When shifting to the compression process, the suction plate valve 36 may not return immediately in the valve closing direction, and a new discharge pressure non-uniformity due to fluid leakage occurs due to the return delay of the suction plate valve 36. It turns out that there is a problem.
JP 2006-105060 A JP 2006-235416 A

  The present invention is an improvement over the invention described in Patent Document 2, and in view of the above problems, the suction plate valve 36 is not excessively deformed and its durability and the like are not impaired. When shifting from the suction process to the compression process, the suction plate valve 36 is immediately returned in the valve closing direction to prevent non-uniform discharge pressure due to fluid leakage accompanying the return delay of the suction plate valve 36. .

According to the present invention, the above problem is solved as follows.
(1) Reciprocation in which fluid is sucked in, compressed and discharged by reciprocatingly sliding a piston having a suction hole in the axial direction in the cylinder by reciprocating motion or reciprocating vibration in the axial direction. In sliding type suction / discharge device,
A suction plate valve for opening and closing the outer end of the suction hole is provided on the outer surface of the piston in accordance with reciprocal sliding thereof, and the amount of separation of the suction plate valve from the outer end of the suction hole is restricted. And a fluid passage from the central portion of the suction plate valve deformation limiting member toward the peripheral portion is provided on the inner side surface of the suction plate valve deformation limiting member. When the process proceeds to the compression step, the fluid in the compression chamber is guided from the outer surface side of the suction plate valve deformation limiting member to the fluid passage and is brought into pressure contact with the outer surface of the suction plate valve.

(2) In the above item (1), a mounting hole is provided in the central portion of the suction plate valve deformation limiting member, and the suction plate valve deformation limiting member is attached to the mounting hole with a tightening screw inserted from the outer surface side of the piston. Install in the center of the piston.

(3) In the above item (2), a gap is provided between the inner peripheral surface of the mounting hole of the suction plate valve deformation restricting member and the outer peripheral surface of the tightening screw, and this gap is communicated with the fluid passage. Is introduced into the fluid passage through the gap from the outer surface side of the suction plate valve deformation limiting member.

(4) In the above item (2) or (3), an axial flow hole is provided in the tightening screw inserted through the mounting hole of the suction plate valve deformation limiting member, and the flow hole communicates with the fluid passage. The fluid is introduced into the fluid passage from the outer surface side of the suction plate valve deformation limiting member through the flow hole.

(5) In any one of the above items (1) to (4), the fluid passage is directed to the inner surface of the suction plate valve deformation limiting member and radially outward from the mounting hole of the suction plate valve deformation limiting member. It is formed by grooves recessed radially.

(6) In any one of the above items (1) to (4), the fluid passage is directed radially outward from the mounting hole of the suction plate valve deformation limiting member on the inner surface of the suction plate valve deformation limiting member. Thus, a ridge is provided radially, and the groove is formed by recessing the ridge.

(7) In any one of the above items (1) to (4), the fluid passage is formed by a spiral groove from the attachment hole of the suction plate valve deformation limiting member toward the outer peripheral portion on the inner surface thereof.

(8) In any one of the above items (1) to (7), the inner surface of the suction plate valve deformation limiting member is inclined so as to be separated from the outer surface of the suction plate valve as going outward in the radial direction. Let

According to the present invention, the above problem is solved as follows.
According to the first aspect of the present invention, since the suction plate valve deformation limiting member is provided, the suction plate valve on the outer surface of the piston is prevented from being excessively deformed.
Further, on the inner surface of the suction plate valve deformation limiting member, a fluid passage is provided from the central portion of the suction plate valve deformation limiting member toward the peripheral portion, and when the piston moves from the suction step to the compression step, the fluid is Since the suction plate valve deformation limiting member is guided from the outer surface side to the fluid passage and pressed against the outer surface of the suction plate valve, back pressure is applied to the outer surface of the suction plate valve. Since this back pressure is sequentially applied from the central part of the suction plate valve toward the peripheral part, even if the peripheral part of the suction plate valve that has been generated in the past is separated from the inner and outer surfaces of the suction plate valve deformation limiting member, It is possible to effectively prevent problems such as a delay in the return of the suction plate valve due to the difficulty of detaching the central portion of the plate valve and an incomplete closing of the suction hole even after the return. That is, when shifting from the suction process to the compression process, the suction plate valve can be immediately returned in the valve closing direction to effectively prevent non-uniform discharge pressure due to fluid leakage accompanying the return delay.

  According to the second aspect of the present invention, the suction plate valve deformation limiting member can be easily attached and the suction plate valve can be securely held on the outer surface of the piston.

  According to the third aspect of the present invention, the fluid can be efficiently introduced from the outer surface of the suction plate valve deformation limiting member into the fluid passage provided on the inner surface.

  According to the fourth aspect of the invention, the same effect as in the previous item can be obtained.

  According to the fifth aspect of the present invention, it is possible to apply the back pressure almost uniformly to the outer surface of the suction plate valve and to immediately return the suction plate valve.

  According to the sixth aspect of the invention, the same effect as in the previous item can be obtained.

  According to the seventh aspect of the invention, the same effect as in the previous item can be obtained.

  According to the eighth aspect of the present invention, excessive deformation of the suction plate valve is satisfactorily prevented.

  FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention, which is the same as FIG. FIG. 2 is an enlarged vertical front view of the left piston and its peripheral members in FIG. FIG. 3 is an exploded perspective view of the left piston and its peripheral members. FIG. 4 is a perspective view of the suction plate valve deformation limiting member in FIGS. 1 to 3 as viewed from the inside. FIG. 5 is an enlarged cross-sectional view taken along line VV in FIG. 4 and shows a cross section of the fluid passage. FIG. 6 is a perspective view of the piston to which the suction plate valve deformation limiting member is attached as viewed from the outside.

  1 to 3 are the same as those shown in FIG. 10, the same elements are denoted by the same reference numerals, the description thereof is omitted, and the following is different from FIG. 10. Only the part will be described.

  In FIG. 1, a suction plate valve deformation limiting member (hereinafter abbreviated as a limiting member) 1 that covers the suction plate valve 36 is attached to the outer surface of the piston 30.

  As shown in FIGS. 2 to 4 and 6, the restricting member 1 has a plurality of arcuate shapes that protrude inward from the inner peripheral edge of the disk 2 having a diameter slightly larger than the diameter of the suction plate valve 36. Engagement protrusions 3 are provided, and these engagement protrusions 3 can be engaged with engagement grooves 33 c formed on the outer surface of the piston ring 33.

  A mounting hole 6 is formed in the center of the disk 2 in the limiting member 1, and the limiting member 1 has a central portion of the piston 30 with a fastening screw 37 inserted into the mounting hole 6 from the outer surface side of the piston 30. Installed on.

  The inner surface of the limiting member 1 that faces the outer surface of the suction plate valve 36 is an inclined surface 4 that is inclined so as to be separated from the outer surface of the suction plate valve 36 as it goes outward in the radial direction. The inclined surface 4 is provided with fluid passages 5 that extend radially outward from the attachment hole 6 of the restricting member 1 to the periphery.

  As shown in FIG. 5, the fluid passage 5 has a groove shape that is radially recessed from the mounting hole 6 of the restriction member 1 toward the outer side in the radial direction on the inner surface of the restriction member 1. The inner end in the radial direction is provided in correspondence with the position of the suction holes 35, 35 and communicates with the mounting hole 6 of the restriction member 1.

  A gap 7 communicating with the fluid passage 5 is provided between the inner peripheral surface of the mounting hole 6 of the restricting member 1 and the outer peripheral surface of the tightening screw 37, and fluid flows from the outer surface side of the restricting member 1 to the gap. 7 is introduced into the fluid passage 5.

  In the intake process of the piston 30 accompanying the forward movement of the drive shaft 31 (movement from the left to the right in FIG. 1), outside air that has flowed into the housing 21 from the inlet hole 41 passes through the intake hole 35 in the piston 30. Then, the peripheral part of the suction plate valve 36 is deformed outward, the suction hole 35 is opened, and the suction valve is introduced into the compression chamber 23 a closed by the discharge valve 38.

  Since the deformation of the suction plate valve 36 is regulated by coming into contact with the inner surface of the restricting member 1, excessive deformation is prevented.

  Next, at the time of transition from the suction process to the compression process of the piston 30 due to the backward movement of the drive shaft 31 (movement from right to left in FIG. 1), the suction plate valve 36 is elastically returned, After closing the suction hole 35 and compressing the outside air introduced into the compression chamber 23a and pressurizing it to a desired discharge pressure, the discharge valve 38 is opened and discharged into the air introduction chamber 25, and then from the outlet hole 40. Discharged.

  In the compression step, a part of the outside air to be discharged from the outlet hole 40 passes through the gap 7 between the inner peripheral surface of the mounting hole 6 of the limiting member 1 and the outer peripheral surface of the tightening screw 37, and the limiting member 1. The fluid passage 5 formed by a groove that is radially recessed outward from the mounting hole 6 of the restricting member 1 on the inner surface of the restricting member 1 flows while contacting the outer surface of the suction plate valve 36. Due to this fluid flow, a back pressure is applied to the outer surface of the suction plate valve 36.

  The suction plate valve 36 immediately returns to the valve closing direction due to the action of the back pressure even when the elastic return force is reduced by grease or the like attached to the inner surface of the restricting member 1. .

  FIG. 7 is an enlarged cross-sectional view of a main part showing another embodiment of the fluid discharge path. In this embodiment, an axial flow hole 8 is provided in a tightening screw 37 inserted through the mounting hole 6 of the restricting member 1, and the inner end of the flow hole 8 is connected to the fluid via the radial hole 8a. The fluid is communicated with the passage 5 so that the fluid in the compression chamber 23 a flows from the outer surface side of the restricting member 1 to the fluid passage 5 through the flow hole 8.

  FIG. 8 is an enlarged cross-sectional view of a main part showing another embodiment of the fluid passage. In this embodiment, projecting ridges 5A extending radially outward from the center of the inner surface of the restricting member 1 are projected, and grooves 5B are provided on the inner surface of the ridges 5A. A fluid passage is formed.

  FIG. 9 is an enlarged cross-sectional view of a main part showing still another embodiment of the fluid passage. In this embodiment, a spiral groove 9 is provided from the peripheral portion on the inner side surface of the restricting member 1 toward the central portion to form a fluid passage.

It is a vertical front view which shows one Embodiment of this invention. FIG. 2 is an enlarged longitudinal sectional front view of a left piston and its peripheral members in FIG. 1. It is a disassembled perspective view of the left piston and its peripheral members. It is the perspective view which looked at the suction plate valve deformation | transformation limiting member in FIGS. 1-3 from the inner side. It is a VV line principal part expanded sectional view in Drawing 4, and is a figure showing the section of a fluid passage. It is the perspective view which looked at the piston to which the suction plate valve deformation | transformation restriction member is attached from the outside. It is a principal part expanded sectional view which shows other embodiment of the fluid discharge path. It is a principal part expanded sectional view which shows other embodiment of a fluid channel | path. It is a principal part expanded sectional view which shows other embodiment of a fluid channel | path. It is a vertical front view which shows the typical example of the conventional reciprocating sliding type suction / discharge device. It is a perspective view of the piston ring in the conventional typical reciprocating sliding type suction / discharge device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Suction plate valve deformation | transformation restriction member 2 Disk 3 Engagement protrusion 4 Inclined surface 5 Fluid passage 5A Projection 5B Groove 6 Mounting hole 7 Gap 8 Flow hole 8a Radial hole 9 Groove 21 Housing 22 End wall 23 Cylinder 23a Compression chamber 24 Annular Partition wall 25 Air guide chamber 26 Fitting hole 27 Magnetic material yoke 28 Coil 29 Permanent magnet 30 Piston 30a Supporting protrusion 31 Drive shaft 32 Ring groove 33 Piston rings 33a and 33b Square uneven part 33c Engaging groove 34 Movable iron core 35 Suction hole 36 Suction plate valve 36a Center hole 37 Clamping screw 38 Discharge valve 39 Discharge hole 40 Outlet hole 41 Inlet hole

Claims (8)

A reciprocating sliding type in which a piston with a suction hole in the axial direction is reciprocally slid by reciprocating motion or reciprocating vibration in the axial direction in the cylinder, so that fluid is sucked in, compressed and discharged. In the suction and discharge device,
A suction plate valve for opening and closing the outer end of the suction hole is provided on the outer surface of the piston in accordance with reciprocal sliding thereof, and the amount of separation of the suction plate valve from the outer end of the suction hole is restricted. And a fluid passage from the central portion of the suction plate valve deformation limiting member toward the peripheral portion is provided on the inner side surface of the suction plate valve deformation limiting member. The fluid in the compression chamber is guided from the outer surface side of the suction plate valve deformation restricting member to the fluid passage and is brought into pressure contact with the outer surface of the suction plate valve when the process proceeds to the compression process. Fluid reciprocating sliding suction and discharge device.   An attachment hole is provided in the central portion of the suction plate valve deformation limiting member, and the suction plate valve deformation restriction member is attached to the central portion of the piston with a fastening screw inserted from the outer surface side of the piston into the attachment hole. The fluid reciprocating sliding suction / discharge device.   A clearance is provided between the inner peripheral surface of the mounting hole of the suction plate valve deformation limiting member and the outer peripheral surface of the tightening screw, and the clearance is communicated with the fluid passage so that the fluid is outside the suction plate valve deformation limiting member. 3. The fluid reciprocating sliding intake / discharge device according to claim 1, wherein the fluid is introduced into the fluid passage from the side through the gap.   The fastening screw inserted through the mounting hole of the suction plate valve deformation limiting member is provided with a flow hole in the axial direction, and the flow hole is communicated with the fluid passage to allow fluid to flow from the outer surface side of the suction plate valve deformation limiting member. The fluid reciprocating sliding type suction / discharge device according to claim 1 or 2, wherein the fluid is introduced into the fluid passage through the flow hole.   The fluid passage is formed on the inner side surface of the suction plate valve deformation limiting member by a groove that is radially recessed from the mounting hole of the suction plate valve deformation limiting member toward the outside in the radial direction. A fluid reciprocating sliding type suction and discharge device according to claim 1.   On the inner surface of the suction plate valve deformation restricting member, the fluid passage is provided with ridges radially from the mounting hole of the suction plate valve deformation restricting member to the outside in the radial direction. The fluid reciprocating sliding type suction / discharge device according to any one of claims 1 to 4.   5. The fluid reciprocating sliding suction according to any one of claims 1 to 4, wherein the fluid passage is formed by a spiral groove from an attachment hole of the suction plate valve deformation limiting member toward an outer peripheral portion on an inner surface thereof. Discharging device.   The fluid reciprocation according to any one of claims 1 to 7, wherein an inner surface of the suction plate valve deformation limiting member is inclined so as to be separated from an outer surface of the suction plate valve as going outward in the radial direction. Sliding suction / discharge device.

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