Bearing fixing device for rotary pump and rotary pump comprising same

Abstract

According to an embodiment of the present invention, there is provided a bearing fixing device for a rotary pump comprising: at least one shaft; a driving portion comprising a driver housing accommodating the shaft, and at least one bearing supporting the shaft; and a fluid pressure generator which is installed at an end portion of the shaft and generates a pressure for a fluid, wherein the bearing fixing device comprises: a body portion extending in a direction in which the shaft extends; a head portion which is formed to restrict a position movement with respect to the bearing and is formed at the front end of the body portion; and a nut member which is provided to be screw-coupled to the body portion via a screw thread formed at the end portion of the body portion. In addition, the rotary pump according to an embodiment of the present invention comprises: a driving portion comprising a driver housing, at least one shaft accommodated in the driver housing, and at least one bearing which supports an extended diameter portion and one side of the shaft while being accommodated in the driver housing; a fluid pressure generator which is connected to the shaft and generates a pressure for a fluid on the basis of a driving force input through the driving portion; and a bearing fixing device which is provided in the driver housing to carry out position fixing with respect to the at least one bearing.

Description

Bearing fixing device for rotary pump and rotary pump including same

[0001] The present invention relates to a bearing position fixing assembly constituting a rotary pump and a rotary pump, and more specifically, to a bearing fixing device of a rotary pump capable of stable operation even in a high-pressure operation environment and a rotary pump including the same.

[0002] In general, a pump is a device that transports liquids or gases through pipes, and is widely used to transport water, petroleum, various chemicals, pulp, sludge, wastewater, and other special fluids. Structurally, these pumps can be classified into reciprocating pumps, rotary pumps, centrifugal pumps, axial pumps, and friction pumps.

[0003] Among the above pumps, rotary pumps are widely used because they have the advantages of large pumping capacity and the suction and discharge directions of the liquid being alternated depending on the rotation direction of the rotor. A conventional rotary pump is composed of a casing in which a pair of rotors are installed built-in on a shaft and have a suction port and a discharge port, a cover that is sealed, a gearbox in which a pair of driving gears mesh with each other to drive the shaft, and a motor that transmits power to the pair of driving gears. The pair of rotors installed built-in within the casing can be manufactured in various structures and shapes with materials such as synthetic resin urethane or metal, and have a structure in which a core body having a keyway formed therein to be installed by being fitted onto the shaft is installed at the center.

[0004] In a conventional rotary pump of this structure, a pair of drive gears installed in a gearbox are rotated by the driving force of a motor to drive a shaft, and a pair of rotors installed in a casing are interlocked and rotated, thereby applying suction and discharge pressures inside the casing to suck and pump liquid.

[0005] However, existing rotary pumps are used for food and pharmaceutical purposes that require high cleanliness, and when the food or pharmaceutical has a certain viscosity, high pressure is applied to the shaft, etc., and various parts constituting the rotary pump are deformed, which has a problem in that stable operation is impossible.

[0006] The present invention has been devised to solve the above problems, and aims to provide a rotary pump and a bearing fixing device for the rotary pump having improved durability and higher operational reliability by enabling stable operation even under high pressure and firmly fixing the position of a bearing that supports the rotation of a shaft.

[0007] The bearing fixing device of the present invention is a bearing fixing device of a rotary pump including a driving unit that receives power from an external source and a fluid pressure generating unit connected to the driving unit and configured to generate pressure for a fluid, wherein the driving unit comprises at least one shaft including a same-diameter portion configured to have the same diameter at both ends and an expanded-diameter portion configured to have a diameter that expands from the rear toward the front, a driving unit housing that accommodates the shaft and includes a rear inner side wall formed at the inner rear and having a rectangular through hole formed therein and a front inner side wall formed at the inner front, and a plurality of bearings coupled to the shaft, wherein the bearing fixing device comprises a body portion that extends in the extension direction of the shaft and is seated on the through hole, a head portion that is formed at the front end of the body portion so as to be capable of limiting positional movement of the bearing and configured to limit rearward movement of the bearing in a state where it passes through the through hole, and a nut member that is provided to be screw-connected to the body portion through a threaded portion formed at an end of the body portion and configured to limit forward movement of the bearing.

[0008] More specifically, the bearing comprises a rear bearing which is mounted on the rear inner wall to rotately support the same diameter portion, and is arranged vertically with respect to the through hole, and a front bearing which is mounted on the front inner wall to rotately support the expanded diameter portion, and the head portion is characterized in that it has a shape corresponding to a through hole formed in a direction perpendicular to an imaginary extension line connecting the centers of the rear bearings.

[0009] More specifically, the through hole is formed so that the vertical length is less than or equal to the distance between adjacent rear bearings, the horizontal length is formed so that the horizontal length is greater than or equal to the distance between the inner sides of the outer rings of the rear bearings, and the head portion is formed so that the outermost circumference is less than or equal to the inner diameter of the through hole.

[0010] More specifically, the head portion is characterized in that it further includes at least one first seating surface, one side of which is provided to be in contact with a plurality of rear bearings at the same time, and an end of which is provided to be positioned within a region between the inner side of the outer ring and the outer side of the inner ring of the rear bearing.

[0011] More specifically, the head portion is characterized in that it further includes a second seating surface that is formed to protrude from the first seating surface toward the extension direction of the body portion and has a surface that comes into contact with the rear bearing formed to have a predetermined curvature.

[0012] More specifically, the body part is characterized in that it further includes a gripping groove formed to extend from the rear of the body part toward the head part (320) to a predetermined depth so as to grip the bearing fixing device when assembling the bearing fixing device.

[0013] The bearing fixing device of the above rotary pump is characterized in that it further includes a gripping member that is provided to be temporarily coupled to the gripping groove and has at least two contact points with the inner circumference of the gripping groove.

[0014] More specifically, the grip member is characterized in that it has a diameter smaller than the diameter of the nut member fastened to the end of the body portion.

[0015] More specifically, the body part is characterized in that it further includes a position-detecting cut groove formed in the same direction as the extension direction of the head part at the free end of the body part so as to be able to determine the position of the head part.

[0016] A rotary pump according to one embodiment of the present invention is characterized by including a driving unit housing including a rear inner wall in which a rectangular through hole is formed and a front inner wall formed at the inner front, a driving unit including at least one shaft accommodated inside the driving unit housing, and at least one bearing mounted on at least one inner wall selected from the rear inner wall and the front inner wall of the driving unit housing to rotatably support the shaft, a fluid pressure generating unit connected to the shaft and configured to generate pressure for a fluid based on a driving force input through the driving unit, and a bearing fixing device provided inside the driving unit housing, mounted on the rear inner wall, and configured to fix a position of at least one of the bearings.

[0017] More specifically, the shaft is characterized by including a first shaft that is provided to be supported by at least one bearing and includes a same diameter portion provided to have the same diameter at both ends and an extended diameter portion provided to have a diameter extending from the rear toward the front, and a second shaft that has a shape corresponding to the first shaft, is arranged to be parallel to the first shaft, and is provided to be supported by at least one bearing.

[0018] More specifically, the bearing is characterized by including a rear bearing that is provided so that its axial position is limited by a bearing fixing device and supports the shaft while being seated on the rear inner wall, and a front bearing that is provided so that its axial position is limited by the bearing fixing device and supports the shaft while being seated on the front inner wall.

[0019] More specifically, the bearing fixing device is provided to contact at least one bearing supporting the shaft, and is characterized by including a head portion that limits forward movement of the shaft and a nut member that limits backward movement of the shaft.

[0020] More specifically, the rear bearing is characterized in that at least one is provided to support the same diameter portion of each of the first shaft and the second shaft, which are arranged in a mutually horizontal direction and parallel, and is arranged on an imaginary same vertical line, and the bearing fixing device is characterized in that it is provided to contact the outer ring of at least one of the rear bearings at the same time.

[0021] More specifically, the front bearing is characterized in that it includes a needle bearing to support an expanded diameter portion of the shaft.

[0022] According to one embodiment of the present invention, a bearing fixing device can support the bearing more firmly through a bearing fixing device including a head portion for limiting the rearward movement of the bearing and a nut member for limiting the forward movement of the bearing, and can provide a rotary pump having a more stable and higher driving reliability by limiting the axial movement of the shaft through a bearing whose position is fixed by the bearing fixing device even when rotational support is performed through a front bearing at the rear of a shaft having an expanded diameter for stable driving of the rotary pump even in a high-pressure environment.

[0023] According to one embodiment of the present invention, a bearing fixing device is formed so that, when forming a through hole, the vertical axis length is formed to be less than or equal to the distance between rear bearings, and the horizontal axis length is formed to be greater than or equal to the distance between the inner sides of the outer rings of the rear bearings, thereby performing insertion through the through hole and performing a rotation operation of the head portion, thereby preventing the bearing fixing device from being separated from the rear inner wall where the through hole is formed while fixing the rear bearing, thereby providing an effect of maintaining a more securely fixed state.

[0024] A bearing fixing device according to one embodiment of the present invention can provide an effect of preventing one or more bearings selected from among a plurality of bearings from being independently displaced by simultaneously contacting at least one bearing through the formation of a first seating surface.

[0025] A bearing fixing device according to one embodiment of the present invention can provide an effect of further improving the position fixing reliability of the bearing fixing device by enabling the head portion to be more stably fixed on the outer ring of the bearing through the formation of a second fixing surface having a predetermined curvature.

[0026] A bearing fixing device according to one embodiment of the present invention can provide improved assembly convenience when assembling a rotary pump including the bearing fixing device by enabling the bearing fixing device to be fixed more easily and firmly through the formation of a gripping groove.

[0027] A bearing fixing device according to one embodiment of the present invention can provide improved assembly convenience when assembling a rotary pump including the bearing fixing device by enabling the bearing fixing device to be fixed more simply and firmly through the formation of a gripping member.

[0028] A bearing fixing device according to one embodiment of the present invention can provide improved assembly convenience by forming the diameter of the gripping member to be smaller than the diameter of the nut member, thereby enabling screw coupling between the nut member and the body portion to be performed even while temporary gripping is being performed through the gripping member.

[0029] A bearing fixing device according to one embodiment of the present invention can provide improved assembly convenience by assisting a worker assembling a rotary pump to more clearly identify the position of the head portion covered by the bearing through a position identification cut-out groove.

[0030] A rotary pump according to one embodiment of the present invention can minimize axial movement of the shaft and bearing that may occur when the rotary pump is driven by fixing the position of at least one bearing provided to support the shaft through a bearing fixing device, thereby providing an effect of significantly reducing the failure rate of the rotary pump.

[0031] A rotary pump according to one embodiment of the present invention can provide the effect of securing improved durability by minimizing deformation of the shaft even when high pressure generated during operation of a fluid pressure generating unit is applied to the shaft by allowing the diameter of the expanded diameter portion of the shaft to be expanded through a front bearing.

[0032] According to one embodiment of the present invention, a rotary pump can more firmly fix the position of the bearing through a bearing fixing device, and thus, even if a front bearing is applied to the expanded diameter portion of the shaft for the above-described shaft diameter expansion, the axial position of the bearings can be more effectively limited.

[0033] In addition, the rotary pump according to one embodiment of the present invention uses a needle bearing as a front bearing, thereby enabling the shaft diameter of the shaft to be significantly expanded compared to the shaft diameter of a conventional rotary pump, and thereby, a higher durability improvement can be expected.

[0034] FIG. 1 is a side cross-sectional view illustrating a side cross-section of a rotary pump according to one embodiment of the present invention.

[0035] FIG. 2 is a cross-sectional view showing a cross-section of a drive unit side of a rotary pump according to one embodiment of the present invention.

[0036] FIG. 3 is a cross-sectional view showing a cross-section of a fluid pressure generating section side of a rotary pump according to one embodiment of the present invention.

[0037] FIG. 4 is a front view showing a state in which a bearing fixing device according to one embodiment of the present invention fixes the position of a bearing.

[0038] FIG. 5 is an enlarged view showing a state in which a bearing fixing device according to one embodiment of the present invention fixes the position of a bearing, enlarged from the front.

[0039] FIG. 6 is an enlarged view showing a state in which a bearing fixing device according to one embodiment of the present invention fixes the position of a bearing, enlarged from the side.

[0040] FIG. 7 is an enlarged view showing a state in which a bearing fixing device according to one embodiment of the present invention fixes the position of a bearing, enlarged from the side.

[0041] Figure 8 is a perspective view illustrating a bearing fixing device according to one embodiment of the present invention.

[0042] Figures 9 to 11 are usage diagrams sequentially illustrating a process in which a bearing fixing device according to one embodiment of the present invention is assembled on a rotary pump.

[0043] The advantages and features of the present invention and the method for achieving them will become clear with reference to the embodiments described in detail below together with the attached drawings.

[0044] However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and these embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform a person having ordinary skill in the art to which the present invention pertains of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0045] Additionally, the terminology used herein is for the purpose of describing embodiments and is not intended to limit the present invention.

[0046] In this specification, the singular includes the plural unless specifically stated otherwise. As used herein, the terms "comprises" and / or "comprising" do not exclude the presence or addition of other components other than the mentioned components.

[0047] Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used in a meaning that can be commonly understood by a person of ordinary skill in the art to which the present invention belongs.

[0048] FIG. 1 is a cross-sectional view illustrating a side cross-section of a rotary pump according to one embodiment of the present invention, FIG. 2 is a cross-sectional view illustrating a cross-section from the drive unit side of a rotary pump according to one embodiment of the present invention, and FIG. 3 is a cross-sectional view illustrating a cross-section from the fluid pressure generating unit side of a rotary pump according to one embodiment of the present invention.

[0049] As illustrated in FIG. 1, a rotary pump according to one embodiment of the present invention is characterized by including a driving unit (100), a fluid pressure generating unit (200), and a bearing fixing device (300).

[0050] The above driving unit (100) is provided to receive driving force from the outside and induce driving of the fluid pressure generating unit (200).

[0051] Here, the driving unit (100) is characterized by including a driving unit housing (110), at least one shaft (120, 140), a gear member (130, 150), and at least one bearing (160, 170, 180, 190).

[0052] First, the drive unit housing (110) is provided to have a predetermined receiving space inside, and the drive unit housing (110) is provided to be mutually coupled with a fluid pressure generating housing (210) that constitutes a fluid pressure generating unit (200) to be described later.

[0053] At this time, the accommodation space of the driving unit housing (110) and the accommodation space of the fluid pressure generating housing (210) can be formed independently of each other.

[0054] In particular, the drive unit housing (110) may have a rear inner wall (111) and a front inner wall (112) formed therein.

[0055] Here, the rear inner wall (111) is formed on the inner rear of the drive unit housing (110), and is formed so that a bearing for supporting rotation of a rear portion of the shaft (120, 140) is installed.

[0056] At this time, a through hole (113) for proceeding with the coupling of the bearing fixing device (300) may be formed in the rear inner wall (111).

[0057] In addition, the front inner wall (112) is formed on the inner front of the drive unit housing (110), and is formed so that a bearing for supporting rotation of a portion of the front of the shaft (120, 140) is installed.

[0058] As described above, by allowing the bearings to be installed on the rear inner wall (111) and the front inner wall (112), respectively, rotational support for the shaft to be described later can be performed.

[0059] And, the shaft (120, 140) is accommodated inside the drive unit housing (110), and at least one or more may be provided.

[0060] Additionally, the shaft (120, 140) may include a same diameter portion formed so that both ends have the same diameter and an expanded diameter portion formed so that the diameter extends from the rear toward the front.

[0061] At this time, the same diameter portion (122) is rotatably supported by being mutually connected to a bearing mounted on the rear inner wall (111), and the expanded diameter portion is rotatably supported by being mutually connected to a bearing mounted on the front inner wall (112).

[0062] Here, the shaft may include a first shaft (120) and a second shaft (140).

[0063] More specifically, an input end (121) may be formed at the rear end of the first shaft (120) so as to be exposed toward the outside of the drive unit housing (110) so that a driving force can be input from the outside, and a front end is formed to extend toward the fluid pressure generating unit (200).

[0064] And, the second shaft (140) is arranged parallel to the first shaft (120), and the expanded diameter portion of the second shaft (140) is formed to extend toward the fluid pressure generating portion (200), and one end portion can be arranged in a state of being accommodated inside the driving portion housing (110).

[0065] At this time, it goes without saying that the second shaft (140) may be provided as an idle shaft.

[0066] In particular, the shaft (120, 140) is characterized in that a diameter expansion portion (123, 142) is formed so as to have a shape in which the diameter expands toward the rear end.

[0067] In this way, by forming a diameter expansion portion on the shaft (120, 140) to expand the diameter of the front end, deformation of the shaft can be minimized even when high pressure generated during operation of the fluid pressure generating portion is applied to the shaft, thereby providing the effect of securing improved durability.

[0068] Here, the first shaft (120) and the second shaft (140) can be mutually connected by a gear member (130, 150), and the gear member (130, 150) can include a first gear member (130) and a second gear member (150).

[0069] At this time, the first gear member (130) is connected to the first shaft (120), the second gear member (150) is connected to the second shaft (140), and the driving force input through the first shaft (120) is also transmitted to the second shaft (140) through the gear members connected to each shaft.

[0070] In addition, the first shaft (120) and the second shaft (140) are characterized in that they are rotatably supported through at least one bearing (160, 170, 180, 190).

[0071] Here, the bearings (160, 170, 180, 190) include a rear bearing (160, 180) and a front bearing (170, 190), and at least one of the rear bearings (160, 180) and the front bearings (170, 190) are provided.

[0072] The above rear bearings (160, 180) are provided to support the same diameter portion (122, 141) of the shaft (120, 140), and at least one may be provided, and more specifically, may be placed at a position adjacent to the input end (121).

[0073] In particular, by applying a ball bearing as the type of the rear bearing (160, 180) provided to support the shaft (120, 140), the position of the rear bearing (160, 180) can be more firmly fixed through the bearing fixing device (300) described later, thereby ensuring stable driving performance.

[0074] At this time, it is characterized in that at least one of the rear bearings (160, 180) selected is provided to support the same diameter portion (122) of the first shaft (120).

[0075] In addition, among at least one of the rear bearings (160, 180), at least one other rear bearing (180) is provided to support the same diameter portion (141) of the second shaft (140) that is arranged parallel to the first shaft (120) described above in a horizontal direction.

[0076] In addition, the rear bearings (160, 180) provided to support the first shaft (120) and the second shaft (140) are characterized in that they are arranged on an imaginary vertical line.

[0077] And, the front bearing (170, 190) is provided to support the expanded diameter portion (123, 142) of the shaft (120, 140), and at least one or more may be provided, and more specifically, may be placed at a position adjacent to the fluid pressure generating portion (200).

[0078] In particular, by applying a needle bearing as the type of the front bearing provided to support the shaft (120, 140), as described above, the shaft diameter of the shaft (120, 140) can be significantly expanded compared to the shaft diameter of the shaft (120, 140) of a conventionally used rotary pump, and thereby, a higher durability improvement can be expected.

[0079] At this time, it is characterized in that at least one of the front bearings (170, 190) selected is provided to support the expanded diameter portion (123) of the first shaft (120).

[0080] In addition, among at least one of the front bearings (170, 190), at least one front bearing (190) is provided to support an expanded diameter portion (142) of the second shaft (140) that is arranged parallel to the first shaft (120) described above in a horizontal direction.

[0081] In addition, the front bearings (170, 190) provided to support the first shaft (120) and the second shaft (140) are characterized in that they are arranged on an imaginary vertical line.

[0082] Next, the bearing fixing device (300) is arranged to contact at least one bearing selected from among at least one rear bearing (160, 180) and at least one front bearing (170, 190) that support the first shaft (120) and the second shaft (140), respectively.

[0083] Here, through the bearing fixing device (300), the axial position of the bearings can be limited.

[0084] At this time, the bearing fixing device (300) is provided so as to simultaneously contact the outer ring of the ball bearing when at least one of the rear bearings (160, 180) is configured as a ball bearing, so as to firmly fix the position of the ball bearing without interfering with the rotation of the ball bearing.

[0085] The above bearing fixing device will be described in more detail with reference to FIGS. 4 to 8, which will be described later.

[0086] Next, the fluid pressure generating unit (200) is formed to provide pressurized fluid by applying pressure to fluid flowing in from the outside, and includes a fluid pressure generating housing (210), a rotor (220), and a rotor fixing member (230).

[0087] First, the fluid pressure generating housing (210) is connected to the drive unit housing (110), and is formed so that a shaft (120, 140) exposed from the drive unit housing (110) can be partially inserted.

[0088] In addition, the fluid pressure generating housing (210) may have a predetermined receiving space formed therein so that some fluid can be received, and a fluid distribution path (212a, 212b) may be formed so that fluid can be distributed in the receiving space.

[0089] And, the rotors (220) are respectively coupled to the shafts, and the rotors (220) respectively coupled to the first shaft (120) and the second shaft (140) rotate to apply a predetermined pressure to the fluid flowing into the fluid pressure generating housing, and discharge the fluid pressurized by the rotors (220) to the outside.

[0090] Here, the rotor (220) can be coupled to the first shaft (120) and the second shaft (140) through the rotor fixing member (230).

[0091] In addition, the bearing fixing device (300) is provided to fix the axial position of the bearing supporting the shaft described above.

[0092]

[0093] Next, with reference to FIGS. 4 to 8, a bearing fixing device according to one embodiment of the present invention will be described in more detail.

[0094] FIG. 4 is a front view showing a state in which a bearing fixing device according to one embodiment of the present invention fixes the position of a bearing, and FIG. 5 is an enlarged view showing a state in which a bearing fixing device according to one embodiment of the present invention fixes the position of a bearing, enlarged from the front.

[0095] As shown in FIGS. 4 and 5, the bearing fixing device is characterized by including a body portion (310), a head portion (320), and a nut member (330).

[0096] First, the rear bearings (160, 180) described above are installed on the rear inner wall (111) to support rotation of the same diameter portion (123), and are arranged in the vertical direction based on the through hole (113).

[0097] Here, the through hole (113) may be formed to have a rectangular shape, and it is preferable that the vertical axis length of the through hole (113) be formed to be less than or equal to the distance between adjacent rear bearings, while the horizontal axis length be formed to be greater than or equal to the distance between the inner sides of the outer rings (163, 183) of the rear bearings.

[0098] And, the body part (310) is formed to extend in the extension direction of the shaft.

[0099] And, the head portion (320) is formed so as to be able to limit the positional movement of the bearing, and is formed at the front end of the body portion.

[0100] At this time, the head portion has a shape corresponding to a through hole formed in a direction perpendicular to an imaginary extension line interconnecting the centers of the rear bearings, and more specifically, the outermost circumference of the head portion is formed to be smaller than or equal to the circumference of the through hole.

[0101] Here, the head portion (320) is formed to penetrate the space between at least one bearing when at least one bearing is arranged to be parallel to each other.

[0102] In addition, the head portion (320) is formed to extend in a direction perpendicular to the extension direction of the body portion so that it can come into contact with the outer ring (163, 183) of the rear bearing described above when a rotation operation is performed on the bearing fixing device.

[0103] In this way, by designing the head portion so that it can be inserted through at least one gap between bearings and come into contact with the bearings through rotational operation, it is possible to provide the effect of more stable and solid bearing position fixation through the head portion.

[0104] At this time, a cut groove (312) for position identification may be formed in the body part (310) to improve the convenience of rotation operation of the head part (320).

[0105] In particular, the cut groove (312) for positioning is formed in the same direction as the extension direction of the head portion (320) at the free end of the body portion (310).

[0106] In this way, by assisting the worker assembling the above-described rotary pump through the above-described position-detecting cut-out (312) to more clearly identify the position of the head portion (320) covered by the bearing and the inner wall of the housing, improved assembly convenience can be provided.

[0107] And, the nut member (330) is provided to be screw-coupled with the body part (310) through a screw thread formed at the end of the body part (310), and more specifically, when the position of the head part (320) is accurately rotated and seated at a position for fixing the position of at least one bearing (160, 180), screw-coupled with the body part (310) is performed.

[0108] FIG. 6 is an enlarged view showing a state in which a bearing fixing device according to one embodiment of the present invention fixes the position of a bearing, enlarged from the side, and FIG. 7 is an enlarged view showing a state in which a bearing fixing device according to one embodiment of the present invention fixes the position of a bearing, enlarged from the side.

[0109] As shown in FIGS. 6 and 7, when assembling the bearing fixing device, the body part (310) is characterized by including a gripping groove (311) so as to be able to grip the bearing fixing device.

[0110] Here, the grip groove (311) is formed to extend from the rear of the body part (310) toward the head part (320) to a predetermined depth, and when the rotary pump is coupled with the driving part housing (110), the grip of the bearing fixing device can be performed through the grip groove (311).

[0111] Here, the drive unit housing (110) may be formed with a through hole having the same outline as the outline shape of the head part (320) so that the head part (320) of the bearing fixing device can pass through, and by forming the through hole of the above-described shape, a more solid bonding performance can be secured when fastening is performed through the above-described nut member after the head part (320) rotates.

[0112] Meanwhile, the bearing fixing device may further include a gripping member (P) provided to grip the body portion.

[0113] Here, the above-mentioned phage member (P) is provided to be temporarily coupled on the phage groove (311).

[0114] In addition, the above-mentioned grip member (P) is provided to have at least two contact points with the inner circumference of the grip groove (311), and a predetermined section of the end portion inserted toward the grip groove (311) may be provided to have a bent shape.

[0115] In addition, the above-mentioned grip member (P) is provided to have a diameter smaller than the diameter of the nut member (330) fastened to the end of the body part (310), as shown in FIG. 7.

[0116] In addition, the bearing fixing device may further include a first washer member (340) and a second washer member (350) for performing a firm screw connection between the nut member (330) and the body part (310) in addition to the nut member (330).

[0117] More specifically, the first washer member (340) may be partially inserted toward the inside of the through hole of the drive unit housing (110) into which the body part (310) is inserted, while wrapping around the rear of the body part (310) to provide a spacer function.

[0118] In addition, the second washer member (350) is provided to prevent loosening of the nut member (330), and is fastened to the body part (310) after fastening of the first washer member (340).

[0119] At this time, the second washer member (350) may include a spring washer.

[0120] As described above, through the formation of the above-described holding member (P), improved assembly convenience can be provided when assembling a rotary pump including the above-described bearing fixing device.

[0121] In addition, by forming the diameter of the grip member (P) to be smaller than the diameter of the nut member (330), it is possible to perform screw connection between the nut member (330) and the body part (310) even while temporary gripping is being performed through the grip member (P), thereby providing improved assembly convenience.

[0122] Next, with reference to FIG. 8, the shape of the head portion formed to firmly fix the position of the bearing in the bearing fixing device of the present invention will be described in more detail.

[0123] Figure 8 is a perspective view illustrating a bearing fixing device according to one embodiment of the present invention.

[0124] As shown in Fig. 8, the head portion (320) includes a first mounting surface (321) and a second mounting surface (322).

[0125] First, the first settling surface (321) is provided so that one side thereof is in contact with at least one bearing (not shown) at the same time.

[0126] More specifically, it is preferable that the first seating surface (321) be provided so that one side is in contact with a plurality of rear bearings at the same time, and that the end is arranged within a region between the inner side of the outer ring and the outer side of the inner ring of the rear bearing, and the rear bearing may be a ball bearing.

[0127] And, the first settling surface (321) is formed with a predetermined area on both sides of the head portion (320) that extends upward and downward from the body portion (310).

[0128] In particular, the first settling surface (321) may be arranged to be positioned on an imaginary center line that interconnects the centers of the adjacent rear bearings (160, 180) when the body part (310) and the nut member (330) are coupled.

[0129] In this way, by forming the first settling surface (321) so as to make contact with at least one or more bearings simultaneously, it is possible to provide an effect of preventing one or more bearings selected from among a plurality of bearings from being independently displaced.

[0130] Next, the second settling surface (322) is formed to more stably settling the outer ring of the bearing.

[0131] In addition, the second mounting surface (322) is formed to protrude from the first mounting surface toward the extension direction of the body portion, and is formed so that the surface in contact with the bearing has a predetermined curvature.

[0132] At this time, the curvature formed on the second mounting surface (322) can be formed to have the same curvature as the curvature of the outermost surface of the bearing.

[0133] In this way, by forming a second seating surface (322) having a predetermined curvature, the outer ring of the bearing can be more stably seated, thereby providing an effect of further improving the position fixing reliability of the bearing fixing device of the present invention.

[0134] Next, the assembly process of the bearing fixing device of the present invention will be described in more detail with reference to FIGS. 9 to 11.

[0135] Figures 9 to 11 are usage diagrams sequentially illustrating a process in which a bearing fixing device according to one embodiment of the present invention is assembled on a rotary pump.

[0136] As shown in Fig. 9, it is inserted between the rear bearings (160, 180) that support the first shaft (120) and the second shaft (140) that are arranged vertically.

[0137] At this time, the head portion (320) of the bearing fixing assembly passes between the rear bearings (160, 180) while maintaining a state parallel to the ground.

[0138] Next, as shown in Fig. 10, when the head portion (320) of the bearing fixing assembly passes between the rear bearings (160, 180) while maintaining a state parallel to the ground, the body portion (310) is settled in the space between the rear bearings (160, 180).

[0139] Thereafter, in the state of the above-described Figure 10, the body part (310) is rotated while detecting the rotational state of the head part (320) through the previously described position detection cut-out (not shown).

[0140] Next, as shown in Fig. 11, when the positioning cut-out is positioned in the vertical direction, the first washer member (340), the second washer member (350), and the nut member (330) are sequentially connected to the threaded portion (S) of the body portion (310).

[0141] In particular, in order to smoothly couple the body part (310) and the first washer member (340), the second washer member (350), and the nut member (330) while maintaining a state in which the extension direction of the head part (320) is rotated to face the vertical direction and positioned so as to simultaneously fix the rear bearings (160, 180), the coupling of the first washer member (340), the second washer member (350), and the nut member (330) is performed while the above-described grip member (P) is temporarily inserted into the grip groove (311).

[0142] In addition, the above-described gripping member (P) can also be used in the steps described in FIGS. 9 and 10 above, and the mounting of the bearing fixing assembly can be performed through the above-described gripping member (P), thereby providing improved assembly convenience as well as excellent assembly reliability.

[0143] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is only for the purpose of explaining the invention, and a person having ordinary skill in the art to which the present invention pertains will be able to understand that various modifications or equivalent embodiments are possible from the detailed description of the invention.

[0144] Therefore, the true scope of the present invention should be determined by the technical idea of ​​the patent claims.

[0145] The bearing fixing device of the present invention is a bearing fixing device of a rotary pump including a driving unit that receives power from an external source and a fluid pressure generating unit connected to the driving unit and configured to generate pressure for a fluid, wherein the driving unit includes at least one shaft including a same-diameter portion provided so that both ends have the same diameter and an expanded-diameter portion provided so that the diameter is expanded from the rear toward the front, a driving unit housing that accommodates the shaft and includes a rear inner side wall formed at the inner rear and having a rectangular through hole formed therein and a front inner side wall formed at the inner front, and a plurality of bearings that are coupled to the shaft, and the bearing fixing device includes a body part that extends in the extension direction of the shaft and is seated on the through hole, a head part that is formed at the front end of the body part so as to be capable of limiting positional movement of the bearing and is configured to limit rearward movement of the bearing in a state where it passes through the through hole, and a nut member that is provided to be screw-connected to the body part through a threaded part formed at an end of the body part and configured to limit forward movement of the bearing. It is made in the form of

[0146] More specifically, the bearing is provided to be mounted on the rear inner wall to rotatably support the same diameter portion, and includes a rear bearing arranged vertically with respect to the through hole, and a front bearing mounted on the front inner wall to rotatably support the expanded diameter portion, and the head portion is provided to have a shape corresponding to a through hole formed in a direction perpendicular to an imaginary extension line interconnecting the centers of the rear bearings.

[0147] More specifically, the through hole is formed so that the vertical length is less than or equal to the distance between adjacent rear bearings, the horizontal length is formed so that the horizontal length is greater than or equal to the distance between the inner sides of the outer rings of the rear bearings, and the head portion is formed so that the outermost circumference is less than or equal to the inner diameter of the through hole, in order to implement the invention.

[0148] More specifically, the head portion is configured to include at least one first seating surface, one surface of which is provided to be in contact with a plurality of rear bearings at the same time, and an end portion thereof is provided to be positioned within a region between the inner side of the outer ring and the outer side of the inner ring of the rear bearing.

[0149] More specifically, the head portion is formed to protrude from the first mounting surface toward the extension direction of the body portion, and further includes a second mounting surface formed so that the surface in contact with the rear bearing has a predetermined curvature.

[0150] More specifically, the body part is configured to further include a gripping groove formed to extend from the rear of the body part toward the head part (320) to a predetermined depth so as to grip the bearing fixing device when assembling the bearing fixing device.

[0151] The bearing fixing device of the above rotary pump is configured to be temporarily coupled to the gripping groove, and further includes a gripping member that is provided to have at least two contact points with the inner periphery of the gripping groove.

[0152] More specifically, the above-mentioned grip member is provided in a form for carrying out the invention so as to have a diameter smaller than the diameter of the nut member fastened to the end of the body portion.

[0153] More specifically, the body part is configured to further include a position-detecting cut-out formed in the same direction as the extension direction of the head part at the free end of the body part so as to be able to determine the position of the head part.

[0154] A rotary pump according to one embodiment of the present invention comprises a driving unit housing including a rear inner wall in which a rectangular through hole is formed and a front inner wall formed at the inner front, a driving unit including at least one shaft accommodated inside the driving unit housing, and at least one bearing mounted on at least one inner wall selected from the rear inner wall and the front inner wall of the driving unit housing to rotatably support the shaft, a fluid pressure generating unit connected to the shaft and configured to generate pressure for a fluid based on a driving force input through the driving unit, and a bearing fixing device provided inside the driving unit housing, mounted on the rear inner wall, and configured to fix a position of at least one of the bearings.

[0155] More specifically, the shaft is provided to be supported by at least one bearing, and includes a first shaft having a same diameter portion provided so that both ends have the same diameter and an extended diameter portion provided so as to have a diameter extending from the rear toward the front, and a second shaft having a shape corresponding to the first shaft, arranged to be parallel to the first shaft, and provided to be supported by at least one bearing.

[0156] More specifically, the bearing is provided with a rear bearing that supports the shaft in a state where it is seated on the rear inner wall and is provided with an axial position limited by the bearing fixing device, and a front bearing that supports the shaft in a state where it is seated on the front inner wall and is provided with an axial position limited by the bearing fixing device, in a form for carrying out the invention.

[0157] More specifically, the bearing fixing device is configured to contact at least one bearing supporting the shaft, and includes a head member for limiting forward movement of the shaft and a nut member for limiting backward movement of the shaft.

[0158] More specifically, the rear bearing is characterized in that at least one is provided to support the same diameter portion of each of the first shaft and the second shaft, which are arranged in a mutually horizontal direction in parallel, and is arranged on an imaginary same vertical line, and the bearing fixing device is provided to be in contact with the outer ring of at least one of the rear bearings at the same time.

[0159] More specifically, the front bearing is configured to include a needle bearing for supporting an expanded diameter portion of the shaft.

[0160] According to one embodiment of the present invention, a bearing fixing device can support the bearing more firmly through a bearing fixing device including a head portion that limits the rearward movement of the bearing and a nut member that limits the forward movement of the bearing, and even when rotational support is performed through a front bearing at the rear of a shaft having an expanded diameter for driving a rotary pump stably even in a high-pressure environment, the axial movement of the shaft can be limited through a bearing whose position is fixed by the bearing fixing device, thereby providing a rotary pump having a more stable and high driving reliability, and is thus expected to be widely used in the industry.

[0161] According to one embodiment of the present invention, the bearing fixing device is expected to be widely used in the industry in that, when forming a through hole, the vertical axis length is formed to be less than or equal to the distance between rear bearings, and the horizontal axis length is formed to be greater than or equal to the distance between the inner sides of the outer rings of the rear bearings, thereby performing insertion through the through hole and performing a rotation operation of the head portion, thereby preventing the bearing fixing device from being separated from the rear inner wall where the through hole is formed while fixing the rear bearing, thereby maintaining a more securely fixed state.

[0162] A bearing fixing device according to one embodiment of the present invention is expected to be widely used in industry because it has the effect of preventing one or more bearings selected from among a plurality of bearings from independently being displaced by simultaneously contacting at least one bearing through the formation of a first seating surface.

[0163] The bearing fixing device according to one embodiment of the present invention is expected to be widely used in industry because it has the effect of further improving the position fixing reliability of the bearing fixing device by allowing the head portion to be more stably fixed on the outer ring of the bearing through the formation of a second fixing surface having a predetermined curvature.

[0164] A bearing fixing device according to one embodiment of the present invention is expected to be widely used in industry because it can provide improved assembly convenience when assembling a rotary pump including the bearing fixing device by enabling the bearing fixing device to be fixed more easily and firmly through the formation of a gripping groove.

[0165] The bearing fixing device according to one embodiment of the present invention is expected to be widely used in industry because it can provide improved assembly convenience when assembling a rotary pump including the bearing fixing device by enabling the bearing fixing device to be fixed more simply and firmly through the formation of a gripping member.

[0166] A bearing fixing device according to one embodiment of the present invention is expected to be widely used in industry in that it can provide improved assembly convenience by forming the diameter of the gripping member to be smaller than the diameter of the nut member, thereby enabling screw coupling between the nut member and the body part even while temporary gripping is in progress through the gripping member.

[0167] A bearing fixing device according to one embodiment of the present invention is expected to be widely used in industry because it can provide improved assembly convenience by assisting a worker assembling a rotary pump to more clearly identify the position of the head portion covered by the bearing through a position identification cutout.

[0168] A rotary pump according to one embodiment of the present invention is expected to be widely used in industry because it can minimize axial movement of the shaft and bearing that may occur when the rotary pump is driven by fixing the position of at least one bearing provided to support the shaft through a bearing fixing device, thereby providing an effect of significantly reducing the failure rate of the rotary pump.

[0169] A rotary pump according to one embodiment of the present invention is expected to be widely used in industry because it can provide the effect of securing improved durability by minimizing deformation of the shaft even when high pressure generated during operation of a fluid pressure generating unit is applied to the shaft by allowing the diameter of the expanded diameter portion of the shaft to be expanded through a front bearing.

[0170] A rotary pump according to one embodiment of the present invention is expected to be widely used in industry because it can more effectively limit the axial positions of bearings even when a front bearing is applied to an expanded diameter portion of a shaft for the above-described shaft diameter expansion, since the position of the bearing can be more firmly fixed through a bearing fixing device.

[0171] In addition, the rotary pump according to one embodiment of the present invention is expected to be widely used in industry because it uses a needle bearing as a front bearing, thereby enabling the shaft diameter of the shaft to be significantly expanded compared to the shaft diameter of a conventional rotary pump, and thereby allows for a higher durability improvement.

Claims

1. A rotary pump comprising a drive unit housing having a rear inner wall and a front inner wall, the drive unit housing accommodating a first shaft and a portion of a second shaft that are arranged in parallel; a first rear bearing and a second rear bearing provided to rotatably support a rear portion of each of the first shaft and the second shaft on the rear inner wall; and a first and second front bearings provided to rotatably support a front portion of each of the first shaft and the second shaft on the front inner wall; a bearing fixing device for limiting axial movement of the rear bearing and the front bearing in the front direction, The above driving unit housing includes a through hole formed in the rear inner wall; A body portion (310) formed to penetrate the rear inner wall while being coupled to the rear inner wall and extending along the extension direction of the shaft; A head portion (320) formed at an end of the front inner wall side of the body portion and provided to limit forward movement of the first and second rear bearings while being coupled to the rear inner wall; and A bearing fixing device for a rotary pump, characterized in that it includes a nut member (330) formed to be threadedly connected to an end of the rear inner wall side of the body part and provided to limit the rearward movement of the first and second rear bearings while connected to the rear inner wall.

2. In paragraph 1, The first shaft and the second shaft, It is arranged so that both ends have the same diameter, and the same diameter portion is located at the rear of the shaft, It is provided to have a diameter that is gradually expanded forward from the above same diameter portion, and includes an expanded diameter portion located at the front of the shaft, The above head part (320) is A bearing fixing device for a rotary pump, characterized in that it is provided to have a shape corresponding to a through hole formed in a direction perpendicular to an imaginary extension line interconnecting the centers of the rear bearings.

3. In paragraph 2, The above through hole is, The vertical axis length is formed to be less than or equal to the distance between adjacent rear bearings, and the horizontal axis length is formed to be greater than or equal to the distance between the inner sides of the outer rings of the rear bearings. The above head part, A bearing fixing device characterized in that the outermost circumference is formed to be smaller than or equal to the inner diameter of the through hole.

4. In paragraph 2, The above head part (320) is It further includes at least one first seating surface (321) arranged so that one side is in contact with a plurality of the rear bearings at the same time, and an end is arranged so that the end is arranged within a region between the inner side of the outer ring and the outer side of the inner ring of the rear bearing; The above first settling surface (321) is A bearing fixing device for a rotary pump, characterized in that when the body part and the nut member are combined, they are arranged on an imaginary center line that mutually connects the centers of the adjacent rear bearings.

5. In paragraph 4, The above head part (320) is A bearing fixing device for a rotary pump, characterized in that it further includes a second fixing surface (322) formed to protrude from the first fixing surface toward the extension direction of the body portion and formed so that the surface in contact with the rear bearing has a predetermined curvature.

6. In paragraph 1, The above body part (310) is A bearing fixing device for a rotary pump, characterized in that it further includes a gripping groove (311) formed to extend from the rear of the body part (310) toward the head part (320) to a predetermined depth so as to be able to grip the bearing fixing device when assembling the bearing fixing device.

7. In paragraph 6, The bearing fixing device of the above rotary pump is, A bearing fixing device for a rotary pump, characterized in that it further includes a grip member (P) that is provided to be temporarily coupled on the grip groove (311) and has at least two contact points with the inner circumference of the grip groove.

8. In paragraph 7, The above-mentioned phage member (P) is, A bearing fixing device for a rotary pump, characterized in that it is provided to have a diameter smaller than the diameter of a nut member fastened to an end of the above body part.

9. In paragraph 2, The above body part (310) is A bearing fixing device for a rotary pump, characterized in that it further includes a position-detecting cut-out (312) formed in the same direction as the extension direction of the head portion (320) at the free end of the body portion (310) so as to be able to determine the position of the head portion (320).

10. A drive unit (100) including a drive unit housing (110) including a rear inner wall in which a rectangular through hole is formed and a front inner wall formed at the inner front, at least one shaft (120, 140) accommodated inside the drive unit housing, and at least one bearing (160, 170, 180, 190) mounted on at least one inner wall selected from among the rear inner wall and the front inner wall of the drive unit housing to support the shaft in rotation; A fluid pressure generating unit (200) connected to the above shaft and configured to generate pressure for the fluid based on the driving force input through the driving unit; and A rotary pump characterized by including a bearing fixing device (300) provided inside the driving unit housing and mounted on the rear inner wall to fix the position of at least one bearing.

11. In paragraph 10, The above shaft, A first shaft, which is provided to be supported by at least one bearing, and which includes a same diameter portion provided to have the same diameter at both ends and an extended diameter portion provided to have a diameter extending from the rear toward the front; and A rotary pump characterized by comprising a second shaft having a shape corresponding to the first shaft, arranged parallel to the first shaft, and supported by at least one bearing.

12. In paragraph 11, The above bearings, A rear bearing which is provided so that its axial position is limited by a bearing fixing device and which supports the shaft while being seated on the rear inner wall; and A front bearing is provided so that the axial position is limited by the bearing fixing device, and supports the shaft while being seated on the front inner wall; The above bearing fixing device, A rotary pump characterized by comprising: a head member configured to contact at least one bearing supporting the shaft and limiting forward movement of the shaft; and a nut member configured to limit backward movement of the shaft.

13. In paragraph 12, The above rear bearing, At least one is provided to support the same diameter portion formed on each of the first shaft and the second shaft, which are arranged in parallel to each other in a horizontal direction, and is characterized in that it is arranged on an imaginary same vertical line. The above bearing fixing device, A rotary pump characterized in that it is arranged to contact the outer ring of at least one of the rear bearings at the same time.

14. In paragraph 12, The above front bearing, A rotary pump characterized in that it includes a needle bearing to support the expanded diameter portion of the shaft.

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