A reverse jet seal structure

Abstract

The utility model relates to fluid seal technical field, concretely relates to a reverse jet flow sealing structure, including throttle ring, the rotary plug joint has the pivot in the throttle ring, and there is a certain gap between the inner circle of throttle ring and the outer circle of pivot, the inner circle arc wall of throttle ring is equipped with several reverse jet flow grooves with the section of J shape on the opening, the reverse jet flow groove includes the drainage section, the reverse rotary arc section and the outflow nose end, and the series connection between the inner circle arc wall of throttle ring, drainage section and reverse rotary arc section is smooth arc surface all.The utility model through the reverse jet flow groove guide enters the part of fluid between throttle ring and pivot gap and changes direction and then reversely emits, the fluid that emits and the rest leakage fluid impact each other, realized fluid mutual infiltration, energy consumption pressure reduction and then through the slit between throttle ring and axle and enters the next stage reverse jet flow groove, such step by step pressure reduction, further reached to the simple and efficient sealing of high pressure fluid.

Description

Technical Field

[0001] This utility model relates to the field of fluid sealing technology, and in particular to a reverse jet sealing structure. Background Technology

[0002] The various devices or systems used to form a leak-proof connection between two mechanical components or process system elements are called seals. A sealing device where there is relative movement between two mating parts of the sealed component is called a dynamic seal. Dynamic seals are divided into two main categories: contact seals and non-contact seals. A contact seal is one where two sealing surfaces are pressed together, in contact, and even embedded to reduce or eliminate gaps. A non-contact seal is one where a certain gap is left between the two sealing surfaces. Non-contact seals utilize fluid dynamics, thermodynamics, and magnetic field effects to achieve sealing of the fluid. Compared to contact seals, non-contact seals, due to the gap between the sealing surfaces, avoid direct friction between them. Although the leakage rate is relatively higher, they are less prone to damage, have a longer service life, and are easier to maintain, making them widely used in rotating or reciprocating fluid machinery.

[0003] Bushing gap seals and labyrinth seals are the two most common types of non-contact seals. Bushing gap seals work by using a long annular slit with a small gap to provide a throttling effect. The effectiveness of this type of seal is directly related to the fluid viscosity, so it is generally only used for sealing liquids. Because it relies solely on the frictional resistance between the fluid and the leakage path to achieve throttling, the sealing effect is generally poor, and the leakage is relatively large. Labyrinth seals are a type of non-contact seal composed of a series of throttling teeth and expansion cavities. The fluid passes at high speed through the very small gaps of the sealing teeth and then enters the suddenly enlarged annular cavity. The fluid suddenly expands, generating strong vortices. Most of the fluid's energy is converted into heat and dissipated, causing the fluid pressure to decrease gradually, thus achieving a sealing effect. Since thermodynamic effects are the main reason for the effective operation of labyrinth seals, they are mainly used for sealing gases. However, to ensure normal rotation between the sealing pairs, the gaps between the sealing pairs in a labyrinth seal are relatively large, resulting in a larger leakage. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a reverse jet sealing structure to solve the problems existing in the prior art, so that the seal can be applied not only to liquid media but also to gaseous media, while having a small leakage.

[0005] Based on the above objectives, this utility model provides a reverse jet sealing structure, including a throttling ring in the shape of a cylindrical ring, a rotating shaft rotatably inserted into the throttling ring, and a gap existing at the insertion point of the throttling ring and the rotating shaft; the inner arc wall of the throttling ring is provided with a plurality of reverse jet grooves with a cross-section in the shape of a J, the reverse jet groove including a guide section, a reverse rotation arc section and an outlet nose end connected in series along the axial direction of the rotating shaft, and the connection points between the inner arc wall of the throttling ring, the guide section and the reverse rotation arc section are all smooth arc surfaces, the guide section corresponds to the vertical segment of the J-shape of the reverse jet groove, and the reverse rotation arc section corresponds to the hook segment of the J-shape of the reverse jet groove.

[0006] According to the technical solution provided in this application, the throttling ring includes an upper main ring and a lower annular protrusion for support; a water-absorbing ring is provided on the top of the throttling ring, and a water-pushing blade is coaxially connected to the rotating shaft; the water-absorbing ring includes a conical annular bottom ring and a sponge ring fixed on the top surface of the bottom ring.

[0007] According to the technical solution provided in this application, the top surface of the bottom ring is provided with a plurality of overflow grooves in a radial pattern, and the bottom surface of the bottom ring is provided with a plurality of protrusions for insertion and fixing at the top surface of the main ring in a radial pattern. The sponge ring includes an inner ring portion in the shape of a circular ring and a plurality of radial strip-shaped portions connected to the outside of the inner ring portion. The gap between the radial strip-shaped portions of two adjacent sponge rings corresponds one-to-one with the position of the overflow grooves. The inner edge of the inner ring portion of the sponge ring is in contact with the outside of the rotating shaft.

[0008] According to the technical solution provided in this application example, the water-pushing blade is fixedly sleeved on the outside of the rotating shaft by bolts, the water-pushing blade is in a spiral downward shape, and the blade diameter of the water-pushing blade increases from the inside to the outside.

[0009] According to the technical solution provided in this application, the top surface of the main ring is a conical inclined surface for hydrophobicity. Two liquid storage boxes are slidably sleeved on the outside of the main ring. The bottom surface of the liquid storage box contacts the top surface of the annular convex edge. The liquid storage box is in the shape of a semi-cylindrical ring. The top of the liquid storage box is provided with a lower baffle aligned with the edge of the top surface of the main ring and an upper baffle for blocking the sponge ring. The lower baffle and the upper baffle do not contact each other. A slot is fixedly provided at one end of the liquid storage box, and a locking pin that cooperates with the slot is fixedly provided at the other end of the liquid storage box.

[0010] The beneficial effects of this utility model are:

[0011] 1. In this reverse jet sealing structure, the pressure on the sealed fluid side is relatively high at the sealing point, exhibiting a tendency to leak outwards. As the fluid moving in the leakage direction flows from the high-pressure side to the low-pressure side along the gap between the throttling ring and the rotating shaft, a portion of the fluid, guided by the guide section of the reverse jet groove, moves along the upper wall of the reverse jet groove. Under the guiding effect of the reverse rotation arc section, it changes direction and finally exits obliquely backwards from the outlet nose. This ejected portion of fluid collides with another portion of fluid moving straight outwards along the rotating shaft. The two fluids, moving in almost completely opposite directions, violently mix, expend energy, and reduce pressure before entering the next stage of the reverse jet groove through the narrow gap between the throttling ring and the shaft. This process of gradually reducing pressure at each stage achieves a simple and efficient seal for the leaking fluid.

[0012] 2. In this reverse jet sealing structure, if the fluid to be sealed is liquid, and a small amount of liquid still flows from the high-pressure side to the low-pressure side after the pressure reduction through the reverse jet groove, the sponge ring will absorb the leaking liquid. The liquid absorbed into the inner ring of the sponge ring will spread evenly to the outside of the sponge ring. At the same time, the rotation of the shaft drives the water-pushing blades to rotate, thereby continuously rotating the water-pushing blades outward and squeezing the sponge ring, thus pushing the liquid absorbed into the sponge ring outward and collecting it into the liquid storage box, thereby ensuring that the seal is clean and uncontaminated. Even if a small amount of liquid leaks, it can be quickly collected for cleaning. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0015] Figure 2 This is a partial structural schematic diagram of an embodiment of the present utility model;

[0016] Figure 3 This is a top view of an embodiment of the present utility model;

[0017] Figure 4 This is a longitudinal sectional view of an embodiment of the present utility model;

[0018] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0019] Figure 6 This is a longitudinal cross-sectional view of the liquid storage box in an embodiment of the present invention;

[0020] Figure 7 This is a schematic diagram of the water-absorbing ring in an embodiment of the present invention;

[0021] Figure 8 This is a schematic diagram of the disassembled structure of the absorbent ring in an embodiment of this utility model;

[0022] Figure 9 This is a schematic diagram of the structure of the water-pushing blade in an embodiment of the present invention.

[0023] The diagram is marked as follows:

[0024] 100. Throttling ring; 110. Main ring; 120. Reverse jet groove; 121. Drainage section; 122. Reverse rotary arc section; 123. Outflow nose; 130. Annular convex edge;

[0025] 200. Shaft;

[0026] 300. Absorbent ring; 310. Bottom ring; 311. Overflow groove; 312. Raised strip; 320. Sponge ring;

[0027] 400. Water-pushing blades;

[0028] 500. Liquid reservoir; 510. Lower baffle; 520. Upper baffle; 530. Slot; 540. Locking pin. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0030] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] like Figures 1-9As shown, a reverse jet sealing structure includes a throttling ring 100 in the shape of a cylindrical ring. The throttling ring 100 is typically fixed to the housing of the shaft sealing device and is in a stationary state. A rotating shaft 200 is rotatably inserted into the throttling ring 100, and a gap exists at the insertion point between the throttling ring 100 and the rotating shaft 200 to ensure the normal operation of the rotating shaft 200. In this embodiment, as... Figure 5 As shown, the inner arc wall of the throttling ring 100 is provided with several reverse jet grooves 120 with a J-shaped cross section. The reverse jet groove 120 includes a guide section 121, a reverse rotation arc section 122 and an outlet nose 123 connected in series along the axial direction of the rotating shaft 200. The connection between the inner arc wall of the throttling ring 100, the guide section 121 and the reverse rotation arc section 122 are all smooth arc surfaces. The guide section 121 corresponds to the vertical length of the J-shape of the reverse jet groove 120, and the reverse rotation arc section 122 corresponds to the hook section of the J-shape of the reverse jet groove 120. Thus, when the fluid leaks upward from the bottom of the gap, a part of the fluid enters the guide section 121 and then passes through the reverse rotation arc section 122 to achieve the kinetic energy remain unchanged but the direction changes as much as possible. It also ensures that the outlet direction of the reverse jet groove 120 is opposite to the direction of fluid leakage, thereby making fuller use of the kinetic energy of the leaking fluid to block the leakage.

[0032] Preferably, the throttling ring 100 includes an upper main body ring 110 and a lower annular protrusion 130 for support; the top of the throttling ring 100 is provided with a water-absorbing ring 300, and a water-pushing blade 400 is coaxially connected to the rotating shaft 200; the water-absorbing ring 300 includes a conical annular bottom ring 310 and a sponge ring 320 fixed on the top surface of the bottom ring 310 to facilitate the replacement and maintenance of the water-absorbing ring 300.

[0033] Specifically, the top surface of the bottom ring 310 is provided with a plurality of overflow grooves 311 radially, and the bottom surface of the bottom ring 310 is provided with a plurality of protrusions 312 for insertion and fixing to the top surface of the main body ring 110. The sponge ring 320 includes an inner ring portion in the shape of a ring and a plurality of radial strip portions connected to the outside of the inner ring portion. The gap between the radial strip portions of two adjacent sponge rings 320 corresponds one-to-one with the position of the overflow grooves 311, thereby facilitating the liquid in the sponge ring 320 to be squeezed into the overflow grooves 311. The inner edge of the inner ring portion of the sponge ring 320 fits against the outside of the rotating shaft 200, thereby increasing the sealing performance without affecting the connection of the gap of the rotating shaft 200 to the atmosphere, and can also immediately absorb the leaked liquid to eliminate the pollution of the liquid to the environment.

[0034] Preferably, the water-pushing blade 400 is bolted to the outside of the rotating shaft 200, thereby allowing control over the degree to which the water-pushing blade 400 squeezes the top of the sponge ring 320 according to specific circumstances. The water-pushing blade 400 has a spiral downward shape, and the blade diameter of the water-pushing blade 400 increases from the inside to the outside. When the rotating shaft 200 rotates, it drives the water-pushing blade 400 to rotate, thereby continuously rotating the water-pushing blade 400 outward to squeeze the sponge ring 320. The liquid absorbed in the radial strip-shaped part on the outside of the sponge ring 320 will be continuously pushed outward by the water-pushing blade 400 and enter the overflow groove 311.

[0035] Preferably, the top surface of the main ring 110 is a conical bevel for hydrophobicity. Two liquid storage boxes 500 are slidably sleeved on the outside of the main ring 110. The bottom surface of the liquid storage box 500 contacts the top surface of the annular protrusion 130 to provide support for the liquid storage box 500. The liquid storage box 500 is in the shape of a semi-cylindrical ring. The top of the liquid storage box 500 is provided with a lower baffle 510 aligned with the edge of the top surface of the main ring 110 and an upper baffle 520 for blocking the sponge ring 320. The lower baffle 510 and the upper baffle 520 are not in contact. The upper surface of the lower baffle 510 can be aligned with and receive the liquid flowing into the overflow groove 311, and then the liquid can enter the storage chamber of the liquid storage box 500 along the lower baffle 510; the upper baffle 520 can ensure that the water separated from the sponge ring 320 will not overflow when it is squeezed by the pusher blade 400; one end of the liquid storage box 500 is fixedly provided with a slot 530, and the other end of the liquid storage box 500 is fixedly provided with a locking pin 540 that cooperates with the slot 530, so as to facilitate the fixing and disassembly of the liquid storage box 500.

[0036] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0037] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A reverse jet sealing structure, characterized in that, The device includes a cylindrical ring-shaped throttling ring (100), in which a rotating shaft (200) is rotatably inserted, and a gap exists at the insertion point between the throttling ring (100) and the rotating shaft (200); the inner arc wall of the throttling ring (100) is provided with a plurality of J-shaped reverse jet grooves (120), each reverse jet groove (120) including a flow guide section connected in series along the axial direction of the rotating shaft (200). (121), reverse rotating arc segment (122) and outflow nose (123), and the connection between the inner arc wall of the throttling ring (100), the guide segment (121) and the reverse rotating arc segment (122) are all smooth arc surfaces. The guide segment (121) corresponds to the vertical length of the J-shape of the reverse jet groove (120), and the reverse rotating arc segment (122) corresponds to the hook section of the J-shape of the reverse jet groove (120).

2. The reverse jet sealing structure according to claim 1, characterized in that, The throttling ring (100) includes an upper main body ring (110) and a lower annular protrusion (130) for support; a water-absorbing ring (300) is provided on the top of the throttling ring (100), and a water-pushing blade (400) is coaxially connected to the rotating shaft (200); the water-absorbing ring (300) includes a conical annular bottom ring (310) and a sponge ring (320) fixed on the top surface of the bottom ring (310).

3. The reverse jet sealing structure according to claim 2, characterized in that, The bottom ring (310) has a plurality of overflow grooves (311) radially formed on its top surface, and the bottom surface of the bottom ring (310) has a plurality of protrusions (312) radially formed for insertion and fixing at the top surface of the main body ring (110). The sponge ring (320) includes an inner ring portion in the shape of a ring and a plurality of radial strip portions connected to the outside of the inner ring portion. The gap between the radial strip portions of two adjacent sponge rings (320) corresponds one-to-one with the position of the overflow grooves (311). The inner edge of the inner ring portion of the sponge ring (320) is in contact with the outside of the rotating shaft (200).

4. The reverse jet sealing structure according to claim 2, characterized in that, The water-pushing blade (400) is fixedly sleeved on the outside of the rotating shaft (200) by bolts. The water-pushing blade (400) is spiral downward in shape, and the blade diameter of the water-pushing blade (400) increases from the inside to the outside.

5. A reverse jet sealing structure according to claim 2, characterized in that, The top surface of the main ring (110) is a conical inclined surface for hydrophobicity. Two liquid storage boxes (500) are slidably sleeved on the outside of the main ring (110). The bottom surface of the liquid storage box (500) is in contact with the top surface of the annular protrusion (130). The liquid storage box (500) is in the shape of a semi-cylindrical ring. The top of the liquid storage box (500) is provided with a lower baffle (510) aligned with the edge of the top surface of the main ring (110) and an upper baffle (520) for blocking the sponge ring (320). The lower baffle (510) and the upper baffle (520) do not contact each other. One end of the liquid storage box (500) is fixedly provided with a slot (530), and the other end of the liquid storage box (500) is fixedly provided with a locking pin (540) that cooperates with the slot (530).

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