CN219557105U

CN219557105U - Rotary damping mechanism

Info

Publication number: CN219557105U
Application number: CN202320330511.4U
Authority: CN
Inventors: 陈国斌; 郭峰
Original assignee: Hoti Xiamen Plumbing Inc
Current assignee: Hoti Xiamen Plumbing Inc
Priority date: 2023-02-27
Filing date: 2023-02-27
Publication date: 2023-08-22
Anticipated expiration: 2033-02-27

Abstract

The utility model discloses a rotary damping mechanism, comprising: a shaft sleeve with a shaft cavity filled with damping oil, a rotating shaft with an inner shaft section in sealing and rotating fit with the shaft cavity, a gland for sealing an opening of the shaft sleeve, and the device further comprises: the piston is arranged in the shaft cavity in a rotation stopping way and matched with the rotating shaft, an outer oil passage of the piston is formed by the matched interval between the piston and the wall of the shaft cavity, and an inner oil passage of the piston is formed by the matched gap between the threaded hole and the outer screw shaft section; a piston ring which can move in the axial direction is arranged on the end part of the piston, which is close to one side of the outer shaft section of the rotating shaft, the piston ring, the piston and the shaft cavity wall are matched to form a one-way valve of a switch outer oil passage, and an inner round hole and the gradient round shaft section are matched to form an opening valve of a switch inner oil passage; when the rotary shaft actuating piston moves to the one-way valve and the opening valve to be closed, damping oil slowly passes through the seepage of the outer oil passage and/or the inner oil passage, the oil pressure difference at the two ends of the piston in the shaft cavity slowly decays, and the decayed oil pressure brakes the piston to slowly move so as to enable the rotary shaft to slowly rotate.

Description

Rotary damping mechanism

Technical Field

The utility model relates to a toilet cover plate assembly, in particular to a rotary damping mechanism.

Background

The basic principle of slow-falling damping of the closestool cover plate is hydraulic slow-falling, and hydraulic torque output is generated by rotating a one-way valve mechanism in a shaft sleeve through the buffer blades in the shaft sleeve.

In the prior art, a blade type damper is also adopted, the blade type damper adopts a radial oil stirring mode, and because radial oil stirring is adopted, gaps among blades are large, so that the amount of damping oil to be filled is large, a rotating shaft becomes weaker due to strong oil pressure when the damper is started, the damper is applied to a light cover plate and a medium cover plate and has a slight advantage, but when the damper is applied to a heavy cover plate, the rotating shaft with a small shaft diameter is difficult to bear, and is used for a long time or is easy to change in size along with seasonal change of thermal expansion and cold contraction, so that the damping effect is affected.

The prior Chinese patent number is as follows: CN207253296U, patent name: the utility model provides a slow-descent damper for closestool apron, including a axle sleeve that can fill damping oil, with the sealed normal running fit of axle sleeve and disturbance damping oil mobile's pivot and two check valve pieces, the oil removal muscle that has relative vertical setting on the inner chamber wall of axle sleeve, the pivot includes the axle core and two rotors of relative axle core subtend setting, and form symmetrical radial gradual change cambered surface between two rotors of pivot, respectively overlap on the rotor of pivot and have a check valve piece and with the inner chamber wall sliding fit of axle sleeve, between two oil removal muscle of axle sleeve inner chamber bottom surface and on pivot and axle sleeve complex terminal surface respectively have the oil groove that crosses of symmetry setting, the axle core lower extreme and axle sleeve inner chamber bottom center normal running fit, two rotors integrality on its pivot axle core is better, so can simplify the structural feature of pivot, reduce the processing degree of difficulty of pivot, and the rotor of check valve piece production pendulum changes, the pivot is strong, but, it is higher to the dimensional requirement of whole axle sleeve inner chamber wall and check valve, tolerance that can tolerate existence is less in the size, the precision deviation or deformation can all lead to the tolerance to be big in the time after using in processing, the die cavity deformation in case tolerance is easy, the whole and the cover plate is fast down in case the speed is fast, the cover plate is fast to the whole is down to the speed is rolled over.

Disclosure of Invention

The utility model provides a rotary damping mechanism which can effectively solve the problems.

The utility model is realized in the following way:

a rotary damping mechanism comprising: a shaft sleeve with a shaft cavity filled with damping oil, a rotating shaft with an inner shaft section in sealing and rotating fit with the shaft cavity, a gland for sealing an opening of the shaft sleeve, and the device further comprises:

the piston is arranged in the shaft cavity in a rotation-stopping way and is matched with the rotating shaft, the piston comprises a central hole which is formed in the axial direction, the central hole consists of a threaded hole and an inner circular hole, the inner shaft section comprises an outer screw shaft section and a gradient circular shaft section, and the outer screw shaft section is screwed in the threaded hole so that the rotating shaft can actuate the piston to axially reciprocate in the shaft cavity to flex damping oil;

the interval between the piston and the shaft cavity wall forms an outer oil passage of the piston, and the interval between the threaded hole and the outer screw shaft section forms an inner oil passage of the piston;

a piston ring which can move in the axial direction is arranged on the end part of the piston, which is close to one side of the outer shaft section of the rotating shaft, the piston ring, the piston and the shaft cavity wall are matched to form a one-way valve of the switch outer oil passage, and the inner circular hole and the gradient circular shaft section are matched to form an opening valve of the switch inner oil passage;

when the rotating shaft actuating piston moves to the one-way valve and the opening valve to be closed, damping oil slowly passes through the seepage of the outer oil passage and/or the inner oil passage, the oil pressure difference at the two ends of the piston in the shaft cavity slowly decays, and the decayed oil pressure braking piston slowly moves to enable the rotating shaft to slowly rotate.

As a further improvement, the piston comprises a cylindrical plug body moving axially inwards in the shaft cavity, and a convex edge extending from the cylindrical plug body towards one side end part close to the outer shaft section of the rotating shaft, and the plug ring reciprocates between an outer ring surface and the convex edge on one side of the cylindrical plug body close to the outer shaft section of the rotating shaft.

As a further improvement, the cylindrical plug body comprises a plurality of guide grooves which are formed in the radial direction, a plurality of guide ribs which are correspondingly matched with the guide grooves are fixedly connected on the inner wall of the shaft cavity, one end of each guide groove, which is close to the inner round hole, is opened, and one end, which is far away from the inner round hole, is closed.

As a further improvement, the cylindrical plug body further comprises a plurality of outer oil passages arranged in the radial direction, the outer oil passages are staggered with the guide grooves at intervals, two ends of each outer oil passage are opened, when the plug ring is propped against the outer oil passing port of each outer oil passage, the outer oil passages are closed, damping oil flows into the outer screw shaft section, and when the plug ring is far away from the outer oil passing port of each outer oil passage, the outer oil passages are opened, and the damping oil moves along the outer oil passages towards the direction close to one side of the gland.

As a further improvement, a strain gap is formed in the radial direction of the plug ring, and the strain gap provides a strain space for radial expansion or contraction of the plug ring.

As a further improvement, the plug ring comprises a circular ring sleeved between the cylindrical plug body and the convex edge, the circular ring comprises a plurality of limit convex parts which are arranged on the inner ring surface of the circular ring and are uniformly distributed at equal intervals, an oil passing concave part which is arranged in a gap between the limit convex parts is arranged, the limit convex parts correspond to the positions of the outer oil passing ports, and the limit convex parts are abutted to the outer oil passing ports or the convex edge along with the movement of the plug ring.

As a further improvement, one side of the circular ring, which is close to the gland, is connected with a uniform ring expansion conical surface, and the strain clearance is abutted against the inner wall of the shaft cavity after the diameter of the ring expansion conical surface is expanded after the strain clearance is blocked by the oil pressure.

As a further improvement, one side of the circular ring far away from the gland is connected with a uniform shrinkage ring conical surface, and damping oil entering from the outer oil passing port can compress the shrinkage ring conical surface inwards, so that a strain gap is separated from the inner wall of the shaft cavity after being compressed, and the damping oil can pass through rapidly.

As a further improvement, the gradient circular shaft section comprises a closed diameter, a gradual change diameter and an opening diameter which are sequentially connected from the extending direction of the outer screw shaft section, and when the piston moves along the direction close to one side of the gland, the opening diameter, the gradual change diameter and the closed diameter are sequentially matched with the inner circular hole.

As a further improvement, the gradient circular shaft section is a matching shaft connected with the external screw shaft section, the head and tail of the matching shaft are equal in diameter, the matching shaft comprises a large-diameter part connected with the external screw shaft section, a gradual change groove which is arranged in the direction of the large-diameter part far away from one side of the gland and gradually increases in groove width is arranged, and the gradual change groove is communicated with the gradual change groove, and the groove width is smaller than or equal to the small-diameter groove with the tail section of the gradual change groove.

The beneficial effects of the utility model are as follows:

according to the vane type rotating shaft universal in industry, a brand new threaded rotating shaft is introduced, the torque borne by the rotating shaft is improved through the cooperation of the threaded rotating shaft and a piston with a threaded hole, the internal space of the threaded type rotating shaft is small, the filled damping oil quantity is reduced, and the vane type rotating shaft can bear extremely large torque even if being applied to a heavy cover plate and is not easy to deform to cause tolerance after long-time use;

then, through the two-phase matching of a check valve formed by the piston ring and the piston and an opening valve formed between the piston and the gradient circular shaft section, the piston ring can be contracted inwards to realize unimpeded cover opening when the cover plate is opened, the piston ring can be expanded against the shaft cavity of the shaft sleeve when the cover plate is closed, damping oil flows back through the inner space of the piston, the effects of early quick descent, medium-term deceleration and later stable descent are realized along with the gradual change of the opening valve, and the closing speed of the cover plate can be improved while the cover plate is slowly lowered;

and because the check valve that ring and piston are constituteed, can expand the ring outside the closing after the oil duct of passing outward and support in the axle intracavity, the outer action of expanding of ring can compensate the internal diameter tolerance of axle chamber, even though the axle chamber appears processing stage or after long-time use warp the error condition that appears dimensional tolerance, also can compensate under the outer expansion of ring, the precision requirement of axle chamber is not high, is not only to the requirement of leaving the factory or operational environment all reduce, easily promotes.

According to the utility model, when the one-way valve and the opening valve are closed and the oil ducts pass through the inside and the outside, the hydraulic damping attenuation enables the piston to slowly move towards the gland, namely the piston moves towards the support point of the cover plate, so that the cover plate is not easy to shake when slowly falling and slowly falling.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of a rotary damping mechanism according to the present utility model.

Fig. 2 is an exploded view (first view) of a rotary damping mechanism according to the present utility model.

Fig. 3 is an exploded view (second view) of a rotary damping mechanism according to the present utility model.

Fig. 4 is a schematic structural view of a plug ring according to the present utility model.

Fig. 5 is a schematic structural view of a piston according to the present utility model.

Fig. 6 is a schematic structural diagram of a rotating shaft according to the present utility model.

Fig. 7 is a schematic front view of a rotary damping mechanism according to the present utility model.

Fig. 8 is a cross-sectional view at A-A in fig. 7 in accordance with the present utility model.

Fig. 9 is a cross-sectional view of the utility model at B-B in fig. 7.

Fig. 10 is a sectional view (cover plate lowered state, opening diameter and inner circular hole fitting stage) at C-C in fig. 9 according to the present utility model.

Fig. 11 is a sectional view (cover plate falling state, gradual diameter and inner circular hole fitting stage) at C-C in fig. 9 according to the present utility model.

FIG. 12 is a cross-sectional view (cover plate lowered condition, closed diameter and inner circular hole mating stage) at C-C of FIG. 9 according to the present utility model.

Fig. 13 is a sectional view (cover plate open state) at C-C in fig. 9 according to the present utility model.

Fig. 14 is a cross-sectional view of a shaft according to another embodiment of the present utility model.

Reference numerals:

a shaft sleeve-1; an axial cavity-10; guide ribs-101;

a rotating shaft-2; an inner shaft section-20; an external screw shaft section-21; gradient circular axis segment-22;

closing diameter-221; gradually changing the diameter to 222; opening diameter-223;

large diameter portion-227; a gradual change groove-228; small diameter groove-229;

a piston-3; a central hole-30; a threaded bore-301; an inner circular hole-302;

cylindrical plug body-31; guide groove-311; convex edge-32;

an outer oil passage-3 a; an outer oil passing port-3 a1; an inner passing oil duct-3 b;

a plug ring-4; strain gap-40; a circular ring-41; limit convex part-411;

oil passing recess-412; expanding the conical surface of the ring to be-42; a shrinkage ring conical surface-43;

gland-5; an end cap-51; a spacer-52; a seal ring-53;

a one-way valve-Q; opening valve-Z.

Detailed Description

For the purpose of making embodiments of the present utility model fall within the scope of the present utility model. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.

In the description of the present utility model, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as referring to purposes, technical solutions and advantages of the present utility model in any way. All other implementations, which can be derived by a person skilled in the art without making any inventive effort, show or imply relative importance or implicitly indicate the number of technical features indicated on the basis of the implementations in the utility model. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1-14, a rotary damping mechanism, comprising: a shaft sleeve 1 with a shaft cavity 10 filled with damping oil, a rotating shaft 2 with an inner shaft section 20 in sealing and rotating fit with the shaft cavity 10, a gland 5 for sealing an opening of the shaft sleeve 1, and the device further comprises: a piston 3 which is mounted in the shaft cavity 10 in a rotation-stopping way and is matched with the rotating shaft 2, the piston 3 comprises a central hole 30 which is arranged in the axial direction, the central hole 30 is formed by a threaded hole 301 and an inner circular hole 302, the inner shaft section 20 comprises an outer screw shaft section 21 and a gradient circular shaft section 22, the outer screw shaft section 21 is screwed in the threaded hole 301 so that the rotating shaft 2 can actuate the piston 3 to axially reciprocate in the shaft cavity 10 to compress damping oil;

as shown in fig. 7 to 12, the space between the piston 3 and the wall of the shaft cavity 10 forms an outer oil passage 3a of the piston 3, and the space between the threaded hole 301 and the outer screw shaft section 21 forms an inner oil passage 3b of the piston 3; a piston ring 4 which can move in the axial direction of the piston 3 is arranged on the end part of the piston 3, which is close to one side of the outer shaft section of the rotating shaft 2, the piston ring 4, the piston 3 and the wall of the shaft cavity 10 are matched to form a one-way valve Q of a switch outer passing oil duct 3a, and the inner circular hole 302 and the gradient circular shaft section 22 are matched to form an opening valve Z of a switch inner passing oil duct 3b; when the piston 3 is actuated by the rotating shaft 2 and is moved to the check valve Q and the opening valve Z to be closed, damping oil slowly passes through the seepage of the outer oil passage 3a and/or the inner oil passage 3b, the oil pressure difference at two ends of the piston 3 in the shaft cavity 10 slowly decays, and the decayed oil pressure brakes the piston 3 to slowly move so as to slowly rotate the rotating shaft 2.

Referring to fig. 1, 7 and 8, in the application of slow damping, damping oil needs to be filled in the shaft sleeve 1, in order to avoid leakage of the damping oil, the gland 5 needs to be welded on the shaft sleeve 1, so that oil leakage phenomenon cannot occur in the process of matching the shaft 2 with the shaft sleeve 1 and the internal structure, in the sealing of the gland, because air exists in the shaft sleeve when the gland is pressed in, if welding is directly performed, noise can be generated in the shaft sleeve when the shaft rotates, so that the gland 5 in the embodiment comprises the end cover 51, the gasket 52 and the sealing ring 53, the gasket 52 is padded on the shaft 2 outside the shaft 2, the sealing ring 53 is sleeved on the shaft 2, the end cover 51 is pressed in the shaft sleeve 1 and the sealing ring 53 to form sealing between the shaft sleeve 2, air in the shaft cavity 10 is discharged from a gap between the inner wall of the shaft sleeve 1 and the annular wall of the end cover 51, and then the end cover 51 is welded and fixed by wave soldering, and the sealing of the shaft sleeve 1 can realize that the inner shaft segment 20 on the shaft 2 is sealed in the shaft cavity 10 filled with the damping oil, and the air in the shaft cavity 10 is completely discharged when the noise is not started.

Referring to fig. 2-3 and 8, the shaft 2 does not move axially in the whole process, but only rotates radially, the shaft 2 includes an external conventional shaft shank section and an inner shaft section 20, wherein the shaft shank section cooperates with a cover plate or a seat ring to realize slow descent, the inner shaft section 20 does not adopt an existing vane type structure, but adopts a spiral design, the inner shaft section 20 is divided into an outer screw shaft section 21 and a gradient circular shaft section 22 which cooperate with two parts of the piston 3, the outer screw shaft section 21 cooperates with the piston 3 to enhance the cooperation effect of the shaft 2 and the piston 3, compared with the way of radially agitating damping oil by vanes, the embodiment adopts the way of axially agitating the damping oil by the piston 3 in the shaft sleeve 1, so that the torque of the shaft 2 is stronger, and the shaft can be stably loaded whether a light cover plate or a heavy cover plate is adopted.

The movement mode of the piston 3 matched with the rotating shaft 2 is different from that of the rotating shaft 2, the piston 3 only moves in the axial direction and does not rotate in the shaft sleeve 1, a central hole 30 is formed in the axial direction of the piston 3, the central hole 30 comprises a threaded hole 301 matched with the outer screw shaft section 21, the threaded hole 301 is matched with the outer screw shaft section 21 so as to rotate in the outer screw shaft section 21 to enable the whole piston 3 to move along the axial direction, the central hole 30 further comprises an inner round hole 302, the inner round hole 302 is directly communicated with the shaft cavity 10 in the shaft sleeve 1, and damping oil can flow back to the original position as a channel in the oil return process.

Referring to fig. 2-3 and 8, a piston ring 4 is further sleeved on the piston 3, and the piston ring 4 can change its own position along with the damping oil and the movement of the piston 3;

two oil paths exist in the whole damping mechanism, one is an oil path for oil, the other is an oil path for oil return, the oil inlet is an outer oil passage 3a formed by utilizing a matched interval between the piston 3 and the wall of the shaft cavity 10, and the oil return is an inner oil passage 3b formed by utilizing a matched interval between the threaded hole 301 and the outer screw shaft section 21;

when a user needs to lift the cover plate, damping oil moves towards the direction close to the gland 5 through the outer oil passage 3a, the gradually introduced damping oil pushes the piston 3 towards one side far away from the gland 5, meanwhile, the damping oil presses the outer annular surface of the plug ring 4, the plug ring 4 is internally pressed, the check valve Q formed by the cooperation of the plug ring 4, the piston 3 and the wall of the shaft cavity 10 is opened for fast oil passing, oil pressure difference cannot be generated at two ends of the piston 3, the rotating shaft 2 can quickly drive the piston 3 to axially and quickly move due to no damping oil pressure effect, namely, the rotating shaft 2 can quickly rotate, the user can easily lift the cover plate, when the cover plate is lifted too fast, the damping oil cannot pass through the plug ring 4 at the moment, and the fast damping oil can squeeze the outer annular surface of the plug ring 4, so that gaps are formed between the plug ring 4 and the wall of the shaft cavity 10 for quick passing of the damping oil;

when a user turns down the cover plate, damping oil flows back through the outer oil passage 3a, but in the process, the damping oil pushes the piston ring 4 towards the direction of the piston 3, the piston ring 4 can block the outer oil passage 3a of the piston 3, namely the one-way valve Q is closed, the outer oil passage 3a is blocked, meanwhile, as the damping oil cannot flow back from the outer oil passage 3a, the continuously introduced damping oil can be boosted, the piston ring 4 can be expanded outwards, the rotating shaft 2 and the piston 3 can not move relatively any more, so that the damping oil can only flow back through the inner oil passage 3b, once the damping oil flows back, the pressure of the plug ring 4 is gradually reduced, the rotating shaft 2 and the piston 3 are restored to a motion state, the cover plate falls under the action of gravity, the opening degree of the opening valve Z is gradually reduced along with the cooperation between the gradient circular shaft section 22 of the rotating shaft 2 and the inner circular hole 302, the opening valve Z is enabled to generate a throttling effect in the moving process of the piston 3, the oil pressure at two ends of the piston 3 is enabled to change, the initial downward overturning speed of the cover plate is enabled to be high, the cover plate is enabled to be slow down until the last uniform speed is achieved, and therefore the cover plate which is uniform and silent is enabled to slowly fall.

Referring to fig. 2, fig. 3, fig. 5 and fig. 8, the piston 3 is divided into two parts in the overall structure, one part is a cylindrical plug body 31, different matching structures are respectively provided on the inner ring surface and the outer ring surface of the cylindrical plug body 31, the other part is a convex edge 32, and the convex edge 32 is used for limiting the plug ring 4, and the specific position relationship is as follows: the piston 3 comprises a cylindrical plug body 31 moving axially inwards in the shaft cavity 10, and a convex edge 32 extending from the cylindrical plug body 31 towards the end part of one side close to the outer shaft section of the rotating shaft 2, the plug ring 4 reciprocates between the outer annular surface of one side of the cylindrical plug body 31 close to the outer shaft section of the rotating shaft 2 and the convex edge 32, a neck is formed between the convex edge 32 and the outer annular surface of the cylindrical plug body 31, the plug ring 4 moves in the neck, the position of the plug ring 4 moving to the cylindrical plug body 31 can seal the outer passing oil duct 3a, and damping oil can flow to one side of the gland 5 through the outer passing oil duct 3a when the plug ring 4 moves to the position of the convex edge 32.

The reason why the piston 3 and the shaft cavity 10 of the shaft sleeve 1 cannot rotate radially is that the cylindrical plug body 31 includes a plurality of guide grooves 311 formed in a radial direction, a plurality of guide ribs 101 corresponding to the guide grooves 311 are fixedly connected to the inner wall of the shaft cavity 10, one end of the guide groove 311 close to the inner circular hole 302 is open, and the other end far away from the inner circular hole 302 is closed, wherein the maximum moving stroke of the cylindrical plug body 31 is the length of the guide ribs 101, i.e., the guide groove 311 cannot be separated from the guide ribs 101 after the cylindrical plug body 31 moves for the longest distance, so that the cylindrical plug body is convenient to reset, and in order to avoid the damping oil from flowing out of the guide groove 311, one end of the guide groove 311 can only be in a closed state and only is open at one side matched with the guide ribs 101.

Referring to fig. 5, the cylindrical plug body 31 further includes a plurality of outer oil passages 3a formed in a radial direction, the outer oil passages 3a and the guide grooves 311 are alternately arranged, two ends of the outer oil passages 3a are opened, as shown in fig. 10 to 12, when the plug ring 4 abuts against the outer oil passing port 3a1 of the outer oil passage 3a, the outer oil passage 3a is closed and damping oil flows into the outer screw shaft section 21; as shown in fig. 13, when the plug ring 4 is far away from the outer oil passing port 3a1 of the outer oil passing channel 3a, the outer oil passing channel 3a is opened and damping oil moves along the outer oil passing channel 3a toward the direction close to the gland 5, in order to facilitate quick circulation of the damping oil, the outer oil passing channel 3a is provided with more than one channel, the outer oil passing channel 3a and the inner wall of the shaft cavity 10 form a sealed flow channel, one end of the outer oil passing channel 3a, which is far away from the gland 5, is communicated with the inner circular hole 302 and the damping oil accommodating cavity formed by the shaft cavity 10, and the other end close to the gland 5 is communicated with the check valve Q, so that the damping oil can flow from the damping oil accommodating cavity to the check valve Q, and thus the two ends of the piston 3 are not closed in the shaft cavity 10 of the sleeve 1 to generate oil pressure difference, i.e. the damping oil has no hydraulic damping effect on the piston 3, and the rotating shaft 2 can drive the piston 3 to rotate quickly.

Referring to fig. 4 and 10-12, when the ring 4 is pressed against the outer oil passing port 3a1, the damping oil cannot flow back into the outer oil passing channel 3a, so that the area where the damping oil is located is a high pressure area, although the damping oil cannot flow in a large amount because the outer oil passing port 3a1 is sealed, the damping oil still can flow in through the gap between the ring 4 and the shaft cavity 10, the pressure in the high pressure area still continuously rises, and because a strain gap 40 is formed in the radial direction of the ring 4, the damping oil in the high pressure area can be pressed into the strain gap 40, the strain gap 40 is enlarged, and a pressure is formed on the ring 4, so that the strain gap 40 is enlarged after the ring 4 is pressed to press against the inner wall of the shaft cavity 10, thereby completely isolating the low pressure area from the high pressure area, the damping oil can only flow back and release through the inner oil passing channel 3b, and meanwhile, the strain gap 40 can also be conveniently embedded into the neck of the piston 3, and the installation is convenient.

Referring to fig. 4 and 13, the plug ring 4 is to ensure that the outer oil passage 3a can be closed when being attached to the cylindrical plug body 31, meanwhile, the flow direction of damping oil to the high-pressure area is not affected when being attached to the flange 32, the plug ring 4 comprises a circular ring 41 sleeved between the cylindrical plug body 31 and the flange 32, the circular ring 41 comprises a plurality of limit protrusions 411 which are arranged on the inner ring surface of the circular ring and are uniformly distributed at equal intervals, an oil passing concave part 412 which is arranged between the limit protrusions 411 and the limit protrusions 411, the limit protrusions 411 correspond to the positions of the outer oil passage 3a1, the limit protrusions 411 are abutted against the outer oil passage 3a1 or the flange 32 along with the movement of the plug ring 4, the limit protrusions 411 can close the outer oil passage 3a when being attached to the cylindrical plug body 31, and a certain gap is reserved after being abutted to the flange 32 due to a certain thickness when being attached to the flange 32, the damping oil can flow in the direction of the gland 5 side of the limit protrusions 411, so that the damping oil can not stagnate in the neck part of the plug ring 4.

Referring to fig. 4, 10 to 12, the annular ring 41 is expanded after the pressure in the high pressure area is increased, if the annular ring is of a simple annular structure, a large pressure is required during the expansion, and the whole structure of the shaft sleeve 1 is easily damaged, so that one side of the annular ring 41 close to the gland 5 is connected with a uniform expansion conical surface 42, the expansion conical surface 42 is abutted against the inner wall of the shaft cavity 10 after the strain gap 40 is blocked by the oil pressure, and when the oil pressure is increased, the expansion conical surface 42 with the expansion amplitude extrudes the expansion conical surface 42 to support the expansion conical surface outwards, thereby reducing the expansion pressure and increasing the pressure within the bearable range of the shaft sleeve 1, so that the high pressure area can be formed.

Referring to fig. 4 and 13, after all damping oil flows back through the inner oil passage 3b, the cover plate is in a horizontal state at this time, when a user needs to use the toilet, the cover plate can be opened quickly under normal conditions, in order to make the blocking force of the user when opening the cover plate less, one side of the circular ring 41, which is far away from the gland 5, is connected with a uniform shrinkage ring conical surface 43, the damping oil entering from the outer oil passage 3a1 compresses the shrinkage ring conical surface 43 inwards, so that the strain gap 40 is separated from the inner wall of the shaft cavity 10 after being compressed, and the damping oil passes quickly, that is, the aperture of the strain gap 40 can be reduced more quickly when the damping oil flowing from the outer oil passage 3a1 encounters the shrinkage ring conical surface 43 with a certain radian, so that the diameter of the circular ring 41 is reduced, and the user cannot feel any blockage or stagnation in the process of opening the cover plate quickly.

Referring to fig. 10-12, in the process that damping oil flows back to the inner oil passage 3b, the rotating shaft 2 rotates continuously, the outer screw shaft section 21 and the gradient round shaft section 22 rotate continuously, the gradient round shaft section 22 and the inner circular hole 302 form an opening valve Z, the gradient round shaft section 22 comprises a closed diameter 221, a gradual diameter 222 and an open diameter 223 which are sequentially connected from the extending direction of the outer screw shaft section 21, when the piston 3 moves along the direction close to the side of the gland 5, the open diameter 223, the gradual diameter 222 and the closed diameter 221 are sequentially matched with the inner circular hole 302, the outer screw shaft section 21 rotates to drive the piston 3 to move towards the side of the gland 5, the inner circular hole 302 in the piston 3 continuously changes position, wherein the inner circular hole 302 is sequentially matched with the open diameter 223, the gradual diameter 222 and the closed diameter 221 in the position changing process, so that the rotating speed of the rotating shaft 2 is changed from quick to uniform, the cover plate can be quickly dropped down to a certain angle, and then slowly dropped down.

In the above embodiment, the various parts of the gradient circular shaft section 22 are not equal in diameter, but the equal diameter does not affect the use of the gradient circular shaft section 22, in another embodiment, referring to fig. 14, the gradient circular shaft section 22 is a mating shaft connected with the external screw shaft section 21, the head and tail of the mating shaft are equal in diameter, the mating shaft comprises a large diameter part 227 connected with the external screw shaft section 21, a gradual change groove 228 which is arranged in the direction of the large diameter part 227 away from the gland 5 and has gradually increased groove width, a small diameter groove 229 which is communicated with the gradual change groove 228 and has the groove width smaller than or equal to the length of the tail section of the gradual change groove 228, as can be clearly seen from the figure, the gradient circular shaft section 22 is equal-diameter from beginning to end, however, two groove bodies, namely a gradual change groove 228 and a small-diameter groove 227, are respectively formed on the gradient circular shaft section 22, the effect achieved by the gradual change groove 228 and the small-diameter groove 227 is equal to that achieved by the gradual change groove 222 and the opening groove 223 in the embodiment, the technical effect achieved by the large-diameter part 229 is equal to that achieved by the closing groove 221, the cover plate is quickly lowered through the early quick oil passing of the small-diameter groove 227, the oil passing area at the gradual change groove 222 is reduced, the cover plate starts to decelerate until the groove body at the position of the large-diameter part 227 completely disappears, the oil passing area is stable, the oil passing speed is slow and stable, and the cover plate starts to be lowered at a uniform speed, thereby achieving the same technical effect as the embodiment.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations may be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A rotary damping mechanism comprising: a shaft sleeve (1) that a shaft chamber (10) is filled with damping oil, a shaft section (20) and the pivot (2) of shaft chamber (10) sealed normal running fit, sealed shaft sleeve (1) open-ended gland (5), its characterized in that still includes:

a piston (3) which is arranged in the shaft cavity (10) in a rotation-stopping way and is matched with the rotating shaft (2), wherein the piston (3) comprises a central hole (30) which is arranged in the axial direction, the central hole (30) is formed by a threaded hole (301) and an inner circular hole (302), the inner shaft section (20) comprises an outer screw shaft section (21) and a gradient circular shaft section (22), and the outer screw shaft section (21) is in threaded connection in the threaded hole (301) so that the rotating shaft (2) can actuate the piston (3) to axially reciprocate in the shaft cavity (10) to flex damping oil;

the interval between the piston (3) and the wall of the shaft cavity (10) forms an outer oil passage (3 a) of the piston (3), and the interval between the threaded hole (301) and the outer screw shaft section (21) forms an inner oil passage (3 b) of the piston (3);

a piston ring (4) capable of moving in the axial direction of the piston ring (4) is arranged on the end part of the piston (3) close to one side of the outer shaft section of the rotating shaft (2), the piston ring (4) is matched with the piston (3) and the wall of the shaft cavity (10) to form a one-way valve (Q) of a switch outer oil passage (3 a), and the inner circular hole (302) is matched with the gradient circular shaft section (22) to form an opening valve (Z) of a switch inner oil passage (3 b);

when the rotating shaft (2) actuates the piston (3) to move to the one-way valve (Q) and the opening valve (Z) to be closed, damping oil slowly passes through seepage of the outer oil passage (3 a) and/or the inner oil passage (3 b), the oil pressure difference at two ends of the piston (3) in the shaft cavity (10) slowly decays, and the decayed oil pressure brakes the piston (3) slowly to slowly move so as to enable the rotating shaft (2) to slowly rotate.

2. A rotary damping mechanism according to claim 1, characterized in that the piston (3) comprises a cylindrical plug body (31) movable axially in the shaft chamber (10), and a flange (32) extending from the cylindrical plug body (31) towards the end of the outer shaft section of the rotating shaft (2), and the plug ring (4) reciprocates between the outer ring surface of the cylindrical plug body (31) on the side of the outer shaft section of the rotating shaft (2) and the flange (32).

3. The rotary damping mechanism according to claim 2, wherein the cylindrical plug body (31) comprises a plurality of guide grooves (311) arranged in the radial direction, a plurality of guide ribs (101) correspondingly matched with the guide grooves (311) are fixedly connected to the inner wall of the shaft cavity (10), one end of the guide groove (311) close to the inner round hole (302) is opened, and one end far away from the inner round hole (302) is closed.

4. A rotary damping mechanism according to claim 3, wherein the cylindrical plug body (31) further comprises a plurality of outer oil passing channels (3 a) formed in the radial direction, the outer oil passing channels (3 a) and the guide grooves (311) are arranged in a staggered manner at intervals, two ends of each outer oil passing channel (3 a) are opened, when the plug ring (4) abuts against an outer oil passing port (3 a 1) of each outer oil passing channel (3 a), the outer oil passing channels (3 a) are closed and damping oil flows into the outer screw shaft section (21), and when the plug ring (4) is far away from the outer oil passing port (3 a 1) of each outer oil passing channel (3 a), the outer oil passing channels (3 a) are opened and the damping oil moves along the outer oil passing channels (3 a) towards the direction close to one side of the gland (5).

5. A rotary damping mechanism according to claim 4, characterized in that the ring (4) is radially provided with a strain gap (40), the strain gap (40) providing strain space for radial expansion or contraction of the ring (4).

6. The rotary damping mechanism according to claim 5, wherein the plug ring (4) comprises a circular ring (41) sleeved between the cylindrical plug body (31) and the convex edge (32), the circular ring (41) comprises a plurality of limiting convex parts (411) which are arranged on the inner ring surface of the circular ring and are uniformly distributed at equal intervals, an oil passing concave part (412) which is arranged in a gap between the limiting convex parts (411) and the limiting convex parts (411) is arranged, the limiting convex parts (411) correspond to the positions of the outer oil passing ports (3 a 1), and the limiting convex parts (411) are abutted on the outer oil passing ports (3 a 1) or the convex edges (32) along with the movement of the plug ring (4).

7. The rotary damping mechanism according to claim 6, wherein one side of the circular ring (41) close to the gland (5) is connected with a uniform ring expansion conical surface (42), and the strain gap (40) is abutted against the inner wall of the shaft cavity (10) after the ring expansion conical surface (42) is expanded after the strain gap is blocked by the damping oil pressure.

8. The rotary damping mechanism according to claim 6, wherein a uniform compression ring conical surface (43) is connected to one side of the circular ring (41) far away from the gland (5), and damping oil entering from the outer oil passing port (3 a 1) can compress the compression ring conical surface (43) inwards, so that the strain gap (40) is separated from the inner wall of the shaft cavity (10) after being compressed in diameter, and the damping oil can pass through rapidly.

9. A rotary damping mechanism according to claim 1, characterized in that the gradient circular shaft section (22) comprises a closed diameter (221), a gradual diameter (222) and an open diameter (223) which are sequentially connected from the extending direction of the outer screw shaft section (21), and when the piston (3) moves along the direction close to the gland (5), the open diameter (223), the gradual diameter (222) and the closed diameter (221) are sequentially matched with the inner circular hole (302).

10. The rotary damping mechanism according to claim 1, wherein the gradient circular shaft section (22) is a mating shaft connected with the external screw shaft section (21), the head and tail of the mating shaft have equal diameters, the mating shaft comprises a large diameter part (227) connected with the external screw shaft section (21), a gradual change groove (228) which is arranged in the direction of the large diameter part (227) away from one side of the gland (5) and has gradually increased groove width, and a small diameter groove (229) which is communicated with the gradual change groove (228) and has a groove width smaller than or equal to the length of the tail section of the gradual change groove (228).