Bladder accumulator

Abstract

A bladder accumulator according to the present invention comprises: a housing member comprising a housing body having a cylindrical shape with open upper and lower portions, and an upper cover coupling portion and a lower cover coupling portion respectively formed on the upper end and the lower end of the housing body; a bladder member having a bladder accommodated in the housing body and a bladder stem connected to the upper portion of the bladder; a gas valve adaptor member which is coupled to the bladder stem and injects an injection gas into the bladder; an upper cover member which is coupled to the upper portion of the housing member and has an upper cover body provided with an upper cover body portion having a seal-accommodating recess accommodating a seal formed on part of the front end of the outer circumference and a screw thread portion formed on the rear end of the outer circumference, and a locking nut coupling the upper cover body and the bladder stem to each other; and a lower cover member which is coupled to the lower portion of the housing member, and comprises a lower cover body portion having a hydraulic oil vertical through-hole formed in the center in the vertical direction and at least one hydraulic oil horizontal through-hole connected to part of the hydraulic oil vertical through-hole in the horizontal direction to extend through to the outer circumference, a seal-accommodating recess accommodating a seal formed on part of the front end of the outer circumference, and a screw thread portion formed on the rear end portion of the outer circumference, a lower cover body which is formed at the front end of the lower cover body portion with a diameter slightly reduced relative to the lower cover body portion so as to have a gap portion through which hydraulic oil passes with respect to a lower cover coupling portion, and an oil port formed in the center of the rear surface of the lower cover body portion so as to be connected to the hydraulic oil vertical through-hole.

Description

bladder accumulator

[0001] The present invention relates to a bladder accumulator, and more particularly, to a bladder accumulator having a bladder in the form of a balloon-shaped elastic body built into the main body of an accumulator for a hydraulic device that accumulates energy of hydraulic fluid, which is an operating fluid.

[0002] An accumulator for a hydraulic device is a device that accumulates the energy of hydraulic fluid, and performs functions such as assisting a hydraulic pump to release accumulated pressure when intermittent or instantaneous pressure increase is required for the operation of a hydraulic device, absorbing surge pressure caused by rapid opening and closing of a hydraulic circuit, or compensating for changes in the volume of hydraulic fluid due to leakage or temperature changes.

[0003] These accumulators basically consist of a main body, which is a housing that is a container for storing hydraulic oil, and an oil port that connects the hydraulic circuit and the main body. Inside the main body, a pressurizing means for applying a certain pressure to the hydraulic oil is built in. As the pressurizing means, a bladder accumulator with a bladder, which is an elastic body that expands by gas pressure such as nitrogen, is widely used.

[0004] As a related prior art technology of such bladder accumulators, there is a 'bladder-type accumulator' of Korean Patent Registration No. 10-2408007, which is a patent document 1 of the prior art document described below.

[0005] The above-mentioned prior art had no choice but to form a main body (10) of an oblong or oval cross-section with curved surfaces formed on both ends, which is the previous prior art as shown in FIG. 2 of the relevant patent registration publication. The problem arising from this was solved by combining a plywood (20) into an accumulator main body (10) which is a U-shaped container as shown in FIG. 6 to FIG. 8 of the relevant patent registration publication, and inserting a retaining body (30) in which a curved recess (31) is formed into the main body (10) to cause the elastic body (11) built into the accumulator to operate.

[0006] However, the above-mentioned conventional technology only improved the curved surface of the upper part of the main body, and still has a problem due to the formation of a curved surface of the lower part of the main body, and there is a problem that an additional prosthesis (30) having a curved portion (31) formed to expand the contact surface and disperse the impact due to the collision between the internal surfaces of the main body (10) when the elastic body (11) is rapidly restored and expanded must be manufactured and used by combining it inside the main body (10), which is inconvenient. In addition, the bladder accumulator of the prior art including the above-mentioned prior art has a problem that, when the filling pressure of the gas is excessive as shown in FIG. 1 of the present invention, the bladder, which is a flexible body, has a considerable step upward so that it can rise and fall for the inflow and discharge of hydraulic oil, and the upper part of the oil valve (or POPPET valve) that is elastically protrudes can be rapidly damaged due to continuous excessive tapping, and in severe cases, the bladder is sucked into the lower part of the oil valve as shown in FIG. 2 and damaged due to a jamming action caused by the oil valve being lowered and closed late, resulting in malfunction and damage to the accumulator.

[0007] Accordingly, the problem to be solved by the present invention is to provide a bladder accumulator that can reduce manufacturing and assembly time as well as maintenance time and cost by drastically simplifying the structure of not only the upper part of the housing, which is the main body, but also the lower part.

[0008] In addition, another problem to be solved by the present invention is to provide a bladder accumulator that can reduce maintenance time and cost as well as manufacturing and assembly time by eliminating the need to additionally manufacture and use a prosthesis having a curved portion formed inside the main body, which is a housing.

[0009] In addition, another problem to be solved by the present invention is to provide a bladder accumulator that can prevent malfunction and damage of the accumulator by preventing sudden damage due to continuous excessive striking with the upper part of the oil valve that has a considerable step and elastically protrudes even when the filling pressure of the gas is excessive, or damage due to a jamming action by the oil valve.

[0010] According to one embodiment of the present invention, a bladder accumulator comprises: a housing body having a cylindrical shape with an open top and bottom, an upper cover coupling portion having a threaded portion formed at an upper end of the housing body, a housing member having a lower cover coupling portion having a threaded portion formed at a lower end of the housing body, a bladder member having a bladder accommodated inside the housing body and a bladder stem connected to an upper portion of the bladder, a gas valve adapter member coupled with the bladder stem to inject an injection gas into the bladder, an upper cover body having an upper portion of the housing member in which the bladder member is accommodated, a sealing receiving groove configured to accommodate a sealing ring formed at a portion of an outer diameter front end, and a threaded portion formed at an outer diameter rear end to be mutually coupled by rotation with a threaded portion formed at the upper cover coupling portion, and an upper cover member having a locking nut that mutually couples the upper cover body and the bladder stem, and an upper cover member coupled to a lower portion of the housing member and having a centrally vertical direction. A lower cover body part having a formed hydraulic oil vertical passage hole and at least one hydraulic oil horizontal passage hole horizontally connected to a portion of the formed hydraulic oil vertical passage hole and penetrating to an outer diameter, a sealing receiving groove for receiving a sealing is formed on a portion of the front end of the outer diameter, and a threaded portion formed on the rear end of the outer diameter and mutually connected by rotation with a threaded portion formed on the lower cover joining portion, a lower cover body having a gap portion at the front end of the lower cover body portion that is slightly reduced in diameter from the lower cover body portion and forms a separation space through which hydraulic oil passes between the lower cover joining portion, and a lower cover member having an oil port formed on the rear center of the lower cover body portion so as to be connected to the hydraulic oil vertical passage hole.

[0011] The above upper cover member may additionally have a curved portion formed inwardly on the front side of the upper cover body portion.

[0012] The above lower cover member may additionally have a curved portion formed along the periphery of the gap portion.

[0013] The upper cover member is coupled to a rear portion of the upper cover body and may further include a plurality of locking washers and locking bolts whose protruding ends are inserted and fastened into a threaded portion of the upper cover coupling portion through horizontal rotation, and the lower cover member may further include a plurality of locking washers and locking bolts which are coupled to a rear portion of the lower cover body and whose protruding ends are inserted and fastened into a threaded portion of the lower cover coupling portion through horizontal rotation.

[0014] It is preferable that the gap between the lower cover joint and the gap be 0.1 to 5 mm wide.

[0015] The upper cover member may further include a name plate coupled to the rear end of the upper cover body by the locking nut while accommodating the bladder stem.

[0016] Meanwhile, a bladder accumulator according to another embodiment of the present invention comprises a housing body having a cylindrical shape with an upper and lower opening, an upper cover coupling portion having a threaded portion formed at an upper end of the housing body, a housing member having a lower cover coupling portion having a threaded portion formed at a lower end of the housing body, a bladder member having a bladder accommodated inside the housing body and a bladder stem connected to an upper portion of the bladder, a gas valve adapter member coupled with the bladder stem to inject an injection gas into the bladder, an upper cover body having an upper cover body portion coupled to an upper portion of the housing member in which the bladder member is accommodated, a sealing receiving groove configured to accommodate a sealing ring at a portion of an outer diameter front end, and a threaded portion formed at an outer diameter rear end to be mutually coupled by rotation with a threaded portion formed at the upper cover coupling portion, and an upper cover member having a locking nut that mutually couples the upper cover body and the bladder stem, and an upper cover member coupled to a lower portion of the housing member and having an internal vertical A lower cover member includes a hydraulic oil passage adapter member having an oil port having a hydraulic oil vertical passage hole formed in a direction, a lower cover body having a lower cover body having a space portion formed through the center of the upper portion of the hydraulic oil vertical passage hole, and a hydraulic oil passage adapter member having a hydraulic oil passage adapter body that is coupled and accommodated in the space portion to form a space portion through which hydraulic oil passes between the lower cover body and the lower cover body, and has a threaded portion having a lower portion having a 'T' shape in cross section and having a first hydraulic oil passage hole formed therein vertically connected to the hydraulic oil vertical passage hole in the lower portion, and at least one second hydraulic oil passage hole formed horizontally connected to the first hydraulic oil passage hole up to an outer diameter in the upper portion.

[0017] The above upper cover member may additionally have a curved portion formed inwardly on the front side of the upper cover body portion.

[0018] The above lower cover member may additionally have a curved portion formed along the periphery of the gap portion.

[0019] The upper cover member is coupled to a rear portion of the upper cover body and may further include a plurality of locking washers and locking bolts whose protruding ends are inserted and fastened into a threaded portion of the upper cover coupling portion through horizontal rotation, and the lower cover member may further include a plurality of locking washers and locking bolts which are coupled to a rear portion of the lower cover body and whose protruding ends are inserted and fastened into a threaded portion of the lower cover coupling portion through horizontal rotation.

[0020] It is preferable that the gap between the lower cover body and the hydraulic oil passage adapter body be 0.1 to 5 mm wide.

[0021] The upper cover member may further include a name plate coupled to the rear end of the upper cover body by the locking nut while accommodating the bladder stem.

[0022] As described above, according to the bladder accumulator according to the present invention, since the upper part as well as the lower part of the main body housing have a simplified structure that does not require forming a curved portion, there is an advantageous effect of reducing maintenance time and costs for inspection and replacement of parts as well as manufacturing and assembly.

[0023] In addition, according to the bladder accumulator according to the present invention, there is no need to additionally manufacture and use a prosthesis having a curved portion formed inside the main body, which is a housing, and instead, a curved portion can be formed directly on the inner surface of the upper cover member and the lower cover member, thereby providing the advantageous effect of reducing maintenance time and costs for inspection and replacement of parts as well as manufacturing and assembly.

[0024] In addition, according to the bladder accumulator according to the present invention, even if an oil valve that has a considerable step and is elastically protruded is removed, it has a structure that facilitates the inflow and discharge of hydraulic oil, so that even when the filling pressure of gas is excessive, the bladder, which is an elastic body, is prevented from being damaged due to sudden damage or a jamming motion, thereby having the advantageous effect of preventing malfunction and damage of the accumulator.

[0025] Figures 1 and 2 are diagrams of gas filling transient malfunction states of a bladder accumulator according to the prior art, respectively.

[0026] Figure 3 is an assembled perspective view of a bladder accumulator according to the present invention;

[0027] Figures 4 and 5 are exploded perspective views of a bladder accumulator according to one embodiment of the present invention, respectively.

[0028] Figure 6 is a cross-sectional view of a bladder accumulator according to one embodiment of the present invention;

[0029] Figures 7 and 8 are enlarged views of the upper and lower parts of Figure 6, respectively.

[0030] Figure 9 is a normal operating state diagram when the bladder accumulator is overfilled with gas according to one embodiment of the present invention.

[0031] Figures 10 and 11 are exploded perspective views of a bladder accumulator according to another embodiment of the present invention, respectively.

[0032] Fig. 12 is a cross-sectional view of a bladder accumulator according to another embodiment of the present invention;

[0033] Figure 13 is an enlarged view of the lower part of Figure 12, and

[0034] Figure 14 is a normal operating state diagram when the gas filling of a bladder accumulator according to another embodiment of the present invention is excessive.

[0035] <Explanation of symbols>

[0036] 1, 2: Bladder accumulator 10: Oil port coupling nipple

[0037] 100: Housing member 110: Housing body

[0038] 120: Upper cover joint 122, 142, 315, 415, 451: Screw thread

[0039] 124, 144: Tolerance part 140: Lower cover joint

[0040] 200: Absence of bladder 210: Bladder

[0041] 220: Bladder stem 230: Gas valve

[0042] 250: Gas valve adapter part 252: Gas valve adapter body

[0043] 254: Bladder stem joint

[0044] 255: Metal fuse 256: Eye bolt

[0045] 300: Upper cover member 310: Upper cover body

[0046] 312: Upper cover body 313, 413: Sealing receiving groove

[0047] 314, 418: Curved surface 320, 420: Sealing

[0048] 330, 430: Cover additional fixing member 332, 432: Locking washer

[0049] 334, 434: Locking bolt 350: Name plate

[0050] 370: Locking nut

[0051] 400, 401: Lower cover member 410, 411: Lower cover body

[0052] 412: Lower cover body part 416: Gap part

[0053] 419: Oil port

[0054] 450: Hydraulic oil passage adapter member 453: First hydraulic oil passage hole

[0055] 455: Hydraulic oil passage adapter body 457: Second hydraulic oil passage hole

[0056] Specific details regarding embodiments of the present invention are included in the detailed description and drawings.

[0057] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided solely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined solely by the scope of the claims.

[0058] Like reference numerals refer to like elements throughout the specification. The embodiments described herein will be described with reference to ideal perspective views, cross-sectional views, enlarged views, and state diagrams of the present invention.

[0059] Hereinafter, a bladder accumulator (1) according to one embodiment of the present invention will be described in detail with reference to the attached drawings FIGS. 3 to 9.

[0060] FIG. 3 is an assembled perspective view of a bladder accumulator according to the present invention, FIGS. 4 and 5 are exploded perspective views of a bladder accumulator according to an embodiment of the present invention, respectively, FIG. 6 is a cross-sectional view of a bladder accumulator according to an embodiment of the present invention, FIGS. 7 and 8 are enlarged views of an upper portion and a lower portion of FIG. 6, respectively, and FIG. 9 is a normal operating state diagram when a gas filling transition occurs of a bladder accumulator according to an embodiment of the present invention.

[0061] A bladder accumulator (1) according to one embodiment of the present invention includes a housing member (100), a bladder member (200), a gas valve adapter member (250), an upper cover member (300), and a lower cover member (400).

[0062] The housing member (100) includes a housing body (110) forming a basic skeleton, an upper cover connecting portion (120), and a lower cover connecting portion (140).

[0063] The housing body (110) is provided as a cylindrical metal tube with an open top and bottom.

[0064] The upper cover joint (120) is formed at the upper end of the housing body (110), and a tolerance portion (124) for securing tolerance during assembly and joining with the screw portion (122) is sequentially formed from the end to the inner diameter with a step.

[0065] The lower cover joint (140) is formed at the lower end of the housing body (110), and a tolerance portion (144) for securing tolerance during assembly and joining with the screw portion (142) is sequentially formed from the end to the inner diameter with a step.

[0066] In this way, the housing body (110) is provided as an open, straight-line cylindrical metal tube, and the upper cover joint (120) and the lower cover joint (140) can be formed as a screw thread (122, 142) and a tolerance part (124, 144) provided as female screws by a simple metal processing method at the inner diameter of the upper and lower ends, so it is a structure that is very easy to manufacture and saves time and cost.

[0067] The bladder member (200) is accommodated inside the housing body (110) and includes a bladder (210) made of rubber that stores or releases fluid energy through contraction and expansion, a bladder stem (220) having a male screw thread formed therein, and a gas valve (230) connected to the end of the bladder stem (220). The configuration of the bladder member (200) is the same as that of the prior art, so a detailed description thereof will be omitted.

[0068] The gas valve adapter member (250) is connected to the bladder stem (220) at the upper part of the bladder member (200) and injects the injected gas into the bladder (210) through the gas valve (230). To this end, the gas valve adapter member (250) has a bladder stem connection portion (254) formed as a female screw thread at one end thereof, and a metal fuse (255) is provided inside thereof to open the gas valve (230) so as to be melted and elastically opened in the event of a fire, thereby discharging the injected gas to the outside, and the other end is configured with a gas valve adapter body (252) to which an eye bolt (256) for convenience of transportation is detachably connected.

[0069] The configuration of the gas valve adapter member (250) is the same as that of the conventional technology, so detailed additional description is omitted.

[0070] The upper cover member (300) is coupled to the upper portion of the housing member (100) in which the bladder member (200) is accommodated, thereby sealingly closing the upper portion of the housing member (100) to protect the bladder (210) and maintain the internal pressure of the housing body (110). To this end, the upper cover member (300) includes an upper cover body (310), a sealing ring (320), a cover additional fixing member (330), a name plate (350), and a locking nut (370).

[0071] The upper cover body (310) includes an upper cover body portion (312), a sealing receiving groove (313), a curved portion (314), and a screw portion (315).

[0072] The upper cover body (312) has a bladder stem passage hole (H1) formed in the central portion, a sealing receiving groove (313) formed in a portion of the outer diameter front end, and a screw thread portion (315) formed as a male screw thread that is easily coupled to the screw thread portion (122) formed in the upper cover connecting portion (120) by rotation is formed in the outer diameter rear end. In addition, the front portion is provided with a curved portion (314) that is sunken inward, so that the curved portion (314) accommodates the bladder stem (220) through the bladder stem passage hole (H1), thereby expanding the surface contact with the upper portion of the bladder (210), dispersing the impact in the event of a mutual collision, and preventing the operating fluid from leaking out to the outside.

[0073] The sealing (320) is provided in an O-ring type and is received and coupled in the sealing receiving groove (313) to contact a portion of the upper inner diameter of the housing body (110), thereby maintaining the internal pressure of the housing body (110) and preventing unwanted external leakage of hydraulic oil.

[0074] The cover additional fixing member (330) is coupled to a plurality of locking washer coupling holes (h1) formed on the rear surface of the upper cover body (310), and includes a plurality of locking washers (332) and locking bolts (334) whose protruding ends are inserted and fastened into a portion of the threaded portion (122) of the upper cover coupling portion (120) through horizontal rotation. At this time, it is preferable to additionally form a groove corresponding to the shape of the end portion in a portion of the threaded portion (122) to facilitate smooth insertion and fastening of the protruding end portion by horizontal rotation of the locking washer (332).

[0075] The cover additional fixing member (330) provides additional fixing force to prevent the upper cover body (310) that is pivotally connected to the upper cover joint (120) from loosening the screw connection due to vibration or impact.

[0076] The name plate (350) is provided in the shape of a circular plate with a perforated bladder stem passage hole (H1) formed in the center, and is connected to the rear end of the upper cover body (310) by a locking nut (370) while accommodating the bladder stem (220).

[0077] The name plate (350) provides a space for displaying product information and also serves to protect the rear of the upper cover body (310).

[0078] The lower cover member (400) is coupled to the lower part of the housing member (100) in which the bladder member (200) is accommodated to seal and close the lower part of the housing member (100), and provides a passage for hydraulic oil to flow into or out of the inside of the housing body (110) by coupling the oil port coupling nipple (10).

[0079] For this purpose, the lower cover member (400) includes a lower cover body (410), a sealing (420), and a cover additional fixing member (430).

[0080] The lower cover body (410) includes a lower cover body portion (412), a sealing receiving groove (413), a screw portion (415), a gap portion (416), a curved portion (418), and an oil port (419).

[0081] The lower cover body (412) has a hydraulic oil vertical passage hole (H2) formed vertically to the center inside to the oil port (419) and a plurality of hydraulic oil horizontal passage holes (H3) formed horizontally to the upper part of the hydraulic oil vertical passage hole (H2) and extending to the outer diameter. In the present embodiment, the present invention is not limited thereto, and four hydraulic oil horizontal passage holes (H3) are formed at 90-degree intervals in the horizontal direction.

[0082] A sealing receiving groove (413) is formed in a part of the center of the outer diameter of the lower cover body (412), and a screw thread (415) is formed in the rear end of the outer diameter, which is formed as a male screw thread that is easily coupled to the screw thread (142) formed in the lower cover connecting portion (140) by rotation.

[0083] At the front end of the lower cover body part (412), a gap part (416) is provided, which has a diameter slightly reduced compared to the lower cover body part (412) and forms a separation space (G1) through which hydraulic oil passes between it and the clearance part (144). As illustrated in FIG. 8, the separation space (G1) between the clearance part (144) and the gap part (416) is not limited thereto, but is preferably 0.1 to 5 mm wide to prevent jamming when gas is excessively filled and to allow the hydraulic oil to smoothly flow into or out of the housing body (110) in consideration of the type of hydraulic oil and the pressure difference between the gas and the hydraulic oil.

[0084] In addition, the front part of the gap part (416) basically has a flat surface, but a curved part (418) is additionally provided on the periphery so that even when gas is excessively filled, as shown in FIG. 9, the corner part can make a gentle curved contact with the bladder (210), thereby expanding the surface contact and dispersing the impact when there is a mutual collision, and can additionally perform the function of blocking the inflow of the bladder (210) into the gap part (416).

[0085] The oil port (419) is formed to protrude outward from the rear center of the lower cover body (419) so as to be connected to the hydraulic oil vertical passage hole (H2) and is connected to the oil port coupling nipple (10) through which hydraulic oil is supplied or discharged from the hydraulic oil pipe.

[0086] The sealing (420) is provided in an O-ring type and is received and coupled in the sealing receiving groove (413) to contact a portion of the lower inner diameter of the housing body (110), thereby maintaining the internal pressure of the housing body (110) and preventing unwanted external leakage of hydraulic oil.

[0087] The cover additional fixing member (430) is coupled to a plurality of locking washer coupling holes (h2) formed on the rear surface of the lower cover body (410), and includes a plurality of locking washers (432) and locking bolts (434) whose protruding ends are inserted and fastened into a portion of the threaded portion (142) of the lower cover coupling portion (140) through horizontal rotation. At this time, it is preferable to additionally form a groove corresponding to the shape of the end portion in a portion of the threaded portion (142) to facilitate smooth insertion and fastening of the protruding end portion by horizontal rotation of the locking washer (432).

[0088] The cover additional fixing member (430) also provides additional fixing force to prevent the lower cover body (410) that is pivotally connected to the lower cover joint (140) from loosening the screw connection due to vibration or impact.

[0089] As described above, according to the bladder accumulator (1) according to one embodiment of the present invention, not only the upper part but also the lower part of the housing member (100) is provided with a simplified structure that does not require forming a curved portion, and the upper cover member (300) and the lower cover member (400) can be simply combined, so that there is an advantageous effect of reducing maintenance time and costs for not only manufacturing and assembly but also inspection and replacement of parts.

[0090] In addition, according to the bladder accumulator (1) according to one embodiment of the present invention, there is an advantageous effect of reducing maintenance time and cost for inspection and replacement of parts as well as manufacturing and assembly by directly forming the curved portions (314, 418) on the inner surface of the upper cover member (300) and the lower cover member (400) without the need to additionally manufacture and use a prosthesis having a curved portion formed therein.

[0091] In addition, according to a bladder accumulator (1) according to one embodiment of the present invention, by eliminating the existing oil valve that has a considerable step and is elastically protruding and using a lower cover member (400) without a step, it has a structure that facilitates the inflow and discharge of hydraulic oil, thereby preventing sudden damage to the bladder (210), which is an elastic body, or damage due to a jamming motion even when the filling pressure of the gas is excessive, thereby having the advantageous effect of preventing malfunction and damage of the accumulator.

[0092]

[0093] Hereinafter, differences between a bladder accumulator (2) according to another embodiment of the present invention and a bladder accumulator (1) according to one embodiment of the present invention will be described in detail with reference to FIGS. 10 to 14.

[0094] FIG. 10 and FIG. 11 are exploded perspective views of a bladder accumulator according to another embodiment of the present invention, respectively, FIG. 12 is a cross-sectional view of a bladder accumulator according to another embodiment of the present invention, FIG. 13 is an enlarged view of the lower part of FIG. 12, and FIG. 14 is a normal operating state diagram when the bladder accumulator is overfilled with gas according to another embodiment of the present invention.

[0095] A bladder accumulator (2) according to another embodiment of the present invention has the same configuration as a bladder accumulator (1) according to one embodiment of the present invention, except that the lower cover member (401) has a changed structure of the lower cover body (411) and a fluid passage adapter member (450) has been added.

[0096] That is, the lower cover main body (411) has a hydraulic oil vertical passage hole (H4) formed in the inner vertical direction of the oil port (419) connected to the rear center of the lower cover body part (412), but unlike one embodiment of the present invention, a plurality of hydraulic oil horizontal passage holes (H3) and a gap portion (416) connected horizontally to the upper portion of the hydraulic oil vertical passage hole (H4) and passing through the outer diameter of the lower cover body part (412) are removed. Instead, a cross-section in which a screw thread portion is formed at the lower portion by penetrating the center portion of the lower cover body part (412) at the upper portion of the vertical passage hole (H4) for the inflow and outflow of hydraulic oil forms a 'T'-shaped space portion, and a hydraulic oil passage adapter member (450) is additionally connected thereto.

[0097] The hydraulic oil passage adapter member (450) includes a lower threaded portion (451) whose cross-section is formed in a 'T' shape to be coupled and accommodated in the above-mentioned space portion, and an upper hydraulic oil passage adapter body (455).

[0098] The screw portion (451) has a first hydraulic oil passage hole (453) formed therein that is vertically connected to a hydraulic oil vertical passage hole (H4).

[0099] The hydraulic oil passage adapter body (455) is not limited thereto, but is formed with four second hydraulic oil passage holes (457) arranged at a 90-degree angle to the outer diameter in the horizontal direction connected to the first hydraulic oil passage hole (453).

[0100] As shown in Fig. 13, the gap (G2) between the hydraulic oil passage adapter member (450) and the lower cover body part (412) by the combination of the screw part (451) is not limited thereto, but is preferably 0.1 to 5 mm wide to prevent jamming when the gas is overfilled and to allow the hydraulic oil to smoothly flow into or out of the housing body (110) in consideration of the type of hydraulic oil and the pressure difference between the gas and the hydraulic oil.

[0101] Based on the inflow and outflow paths of the hydraulic oil, one embodiment of the present invention can be defined as a side type and another embodiment can be defined as a center type.

[0102] Not only can the advantageous effects of the bladder accumulator (1) according to one embodiment of the present invention be achieved by the bladder accumulator (2) according to another embodiment of the present invention, but also, even if the hydraulic oil passage adapter member (450) is employed, it is fixed at a height with almost no step difference from the upper surface of the lower cover body part (412), so that even if continuous excessive striking with the bladder (210) occurs, rapid damage to the bladder (210) can be prevented.

[0103] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

Claims

1. A housing member having a cylindrical housing body with an open upper and lower portion, an upper cover coupling portion having a screw thread formed at an upper end of the housing body, and a lower cover coupling portion having a screw thread formed at a lower end of the housing body. A bladder member having a bladder housed inside the housing body and a bladder stem connected to the upper portion of the bladder; A gas valve adapter member that is combined with the bladder stem and injects the injection gas into the bladder; An upper cover body having an upper cover body portion that is coupled to the upper portion of the housing member in which the bladder member is accommodated, a sealing receiving groove for accommodating a seal is formed on a portion of an outer diameter front end, and a screw thread portion formed on the upper cover coupling portion and a screw thread portion that is mutually coupled by rotation is formed on the outer diameter rear end, and an upper cover member having a locking nut that mutually couples the upper cover body and the bladder stem, and A lower cover body part coupled to the lower part of the housing member, having a hydraulic oil vertical passage hole formed vertically in the center and at least one hydraulic oil horizontal passage hole horizontally connected to a portion of the hydraulic oil vertical passage hole and penetrating to the outer diameter, a sealing receiving groove for receiving a seal is formed on a portion of the front end of the outer diameter, and a threaded portion formed on the rear end of the outer diameter and mutually connected by rotation with a threaded portion formed on the lower cover joining portion, a lower cover body having a gap portion at the front end of the lower cover body portion, the diameter of which is slightly reduced compared to the lower cover body portion, to form a separation space through which hydraulic oil passes between the lower cover joining portion, and a lower cover member having an oil port formed on the rear center of the lower cover body portion to be connected to the hydraulic oil vertical passage hole. Including Bladder accumulator.

2. In paragraph 1, The above upper cover member An inwardly sunken curved portion is additionally formed on the front of the upper cover body portion. Bladder accumulator.

3. In paragraph 1, The above lower cover member An additional protruding curved portion is formed along the circumference of the above gap portion. Bladder accumulator.

4. In paragraph 1, The above upper cover member A plurality of locking washers and locking bolts that are connected to a rear portion of the upper cover body and have protruding ends inserted and fastened into a threaded portion of the upper cover joint through horizontal rotation. Including more, The above lower cover member A plurality of locking washers and locking bolts that are connected to a rear portion of the lower cover body and have protruding ends inserted and connected to a threaded portion of the lower cover joint through horizontal rotation. Including more Bladder accumulator.

5. In paragraph 1, The gap between the lower cover joint and the gap is 0.1 to 5 mm in width. Bladder accumulator.

6. In paragraph 1, The above upper cover member A name plate that is connected to the rear end of the upper cover body by the locking nut while accommodating the bladder stem. Including more Bladder accumulator.

7. A housing member having a cylindrical housing body with an open upper and lower portion, an upper cover coupling portion having a screw thread formed at an upper end of the housing body, and a lower cover coupling portion having a screw thread formed at a lower end of the housing body. A bladder member having a bladder housed inside the housing body and a bladder stem connected to the upper portion of the bladder; A gas valve adapter member that is combined with the bladder stem and injects the injection gas into the bladder; An upper cover body having an upper cover body portion that is coupled to the upper portion of the housing member in which the bladder member is accommodated, a sealing receiving groove for accommodating a seal is formed on a portion of an outer diameter front end, and a screw thread portion formed on the upper cover coupling portion and a screw thread portion that is mutually coupled by rotation is formed on the outer diameter rear end, and an upper cover member having a locking nut that mutually couples the upper cover body and the bladder stem, and A lower cover member including a hydraulic oil passage adapter member having an oil port coupled to the lower part of the housing member and having a hydraulic oil vertical passage hole formed in an internal vertical direction, a lower cover body having a lower cover body portion having a separation space portion formed by penetrating the central portion of the upper part of the hydraulic oil vertical passage hole, and a hydraulic oil passage adapter member having a hydraulic oil passage adapter body coupled to and accommodated in the separation space portion to form a separation space through which hydraulic oil passes between the lower cover body portion and the lower cover body portion, the lower part having a 'T' shape in cross section and having a first hydraulic oil passage hole formed therein vertically connected to the hydraulic oil vertical passage hole in the lower part, and at least one second hydraulic oil passage hole formed horizontally connected to the first hydraulic oil passage hole to an outer diameter thereof in the upper part. Including Bladder accumulator.

8. In paragraph 7, The above upper cover member An inwardly sunken curved portion is additionally formed on the front of the upper cover body portion. Bladder accumulator.

9. In paragraph 7, The above lower cover member An additional protruding curved portion is formed along the circumference of the above gap portion. Bladder accumulator.

10. In paragraph 7, The above upper cover member A plurality of locking washers and locking bolts that are connected to a rear portion of the upper cover body and have protruding ends inserted and fastened into a threaded portion of the upper cover joint through horizontal rotation. Including more, The above lower cover member A plurality of locking washers and locking bolts that are connected to a rear portion of the lower cover body and have protruding ends inserted and connected to a threaded portion of the lower cover joint through horizontal rotation. Including more Bladder accumulator.

11. In paragraph 7, The gap between the lower cover body and the hydraulic oil passage adapter body is 0.1 to 5 mm wide. Bladder accumulator.

12. In paragraph 7, The above upper cover member A name plate that is connected to the rear end of the upper cover body by the locking nut while accommodating the bladder stem. Including more Bladder accumulator.

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