A mechanical seal structure

Abstract

The present invention relates to a mechanical seal structure, comprising a rotating shaft, a moving ring sleeved on the rotating shaft, and a stationary ring fitted with the moving ring, wherein the stationary ring is provided with a liquid inlet and a liquid outlet respectively; the moving ring is provided with two concentrically arranged liquid inlet grooves and liquid outlet grooves, the liquid inlet grooves and the liquid outlet grooves are connected to each other, the liquid inlet grooves are coaxially arranged with the rotating shaft, and the liquid inlet grooves are coaxially arranged with the rotating shaft, wherein the coolant is suitable for being centrifugally injected into the liquid outlet groove from the liquid inlet groove through the rotation of the rotating shaft. The rotating shaft drives the moving ring to rotate relative to the stationary ring, and the working process is simple and fast; the circulation of the coolant and the overall good cooling effect are achieved through the mutual adaptation between the liquid inlet, the liquid outlet, and the liquid inlet groove and the liquid outlet groove; the liquid inlet groove, the liquid outlet groove and the rotating shaft are coaxially arranged, so as to provide a good centrifugal force for the coolant entering the liquid inlet groove, thereby achieving the effect of guided circulation.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical cooling and sealing, and in particular to a mechanical sealing structure. Background Art

[0002] The mechanical seal structure of existing water pumps or mechanical pumps (referred to as "mechanical seal structure") generally adopts a single-end mechanical seal. However, with this type of seal, when no water or other materials enter the pump body, the pump body will idle on its own. At this time, the temperature of the contact end surfaces of the dynamic ring and the static ring will rise rapidly, thereby burning the rubber seal or accelerating the rapid aging of the rubber seal, thereby causing leakage of the pump body and causing damage.

[0003] There is a Chinese patent with application number CN201910516907.6, which proposes a single-end mechanical seal structure with water cooling and its working method. The main method is to provide a sealing loop on the side of the moving ring that contacts the static ring, and introduce cooling water from the outside, so that the heat generated by the friction contact between the moving ring and the static ring can be effectively dissipated, thereby keeping the static ring always within a reasonable temperature range; however, in this scheme, when the shaft stops rotating, the coolant driven by the impeller still remains in the water inlet pipe, the water outlet pipe and the loop, and the overall sealing effect is also general.

[0004] Therefore, it is necessary to provide a mechanical seal structure with good sealing effect. Summary of the invention

[0005] The purpose of the present invention is to provide a mechanical seal structure with good sealing effect to solve the above problems.

[0006] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a mechanical seal structure, including a rotating shaft, a dynamic ring sleeved on the rotating shaft, and a static ring fitted with the dynamic ring, wherein the static ring is respectively provided with a liquid inlet and a liquid outlet; the dynamic ring is provided with two concentrically arranged liquid inlet grooves and liquid outlet grooves, the liquid inlet grooves and the liquid outlet grooves are connected to each other, and the liquid inlet groove is coaxially arranged with the rotating shaft, and

[0007] The liquid inlet groove is coaxially arranged with the rotating shaft, wherein

[0008] The cooling liquid is suitable for being injected into the liquid outlet tank from the liquid inlet tank through the rotation of the rotating shaft.

[0009] Preferably, the liquid inlet groove and the liquid outlet groove are connected to each other through a first connecting hole and a second connecting hole;

[0010] The liquid inlet inner wall of the liquid inlet groove is inclined, and the intersection of the central axis of the first connecting hole and the central axis of the liquid inlet port on the liquid inlet inner wall of the liquid inlet groove is located at the same horizontal position;

[0011] The outer liquid outlet wall of the liquid outlet groove is inclined, and the intersection of the central axis of the second connecting hole and the central axis of the liquid outlet on the outer liquid outlet wall of the liquid outlet groove is located at the same horizontal position.

[0012] Preferably, the inclination angle of the liquid inlet inner ring wall and the liquid outlet outer ring wall is 45°.

[0013] Preferably, the mechanical seal structure further comprises a spring seat sleeved on the rotating shaft and a compression spring sleeved on the rotating shaft, one end of the compression spring abuts against the spring seat, and the other end abuts against the end surface of the moving ring.

[0014] Preferably, a guide ring wall is provided at one end surface of the spring seat, and the outer ring of the moving ring is in contact with the inner ring of the guide ring wall.

[0015] Preferably, a limiting ring is provided at the fitting end surface of the static ring, and the dynamic ring is clamped in the limiting ring.

[0016] Preferably, the mechanical seal structure further comprises a coolant tank, a negative pressure is formed inside the coolant tank, a liquid outlet pipe of the coolant tank is connected and communicated with the liquid inlet, and a liquid inlet pipe of the coolant tank is connected and communicated with the liquid outlet.

[0017] The present invention has the following beneficial effects:

[0018] 1. The rotating shaft drives the moving ring to rotate relative to the static ring, and the working process is simple and fast;

[0019] 2. Through the mutual adaptation between the liquid inlet, the liquid outlet, the liquid inlet tank and the liquid outlet tank, the circulation of the coolant and the overall good cooling effect are realized;

[0020] 3. The liquid inlet tank, the liquid outlet tank and the rotating shaft are coaxially arranged to provide a good centrifugal force for the coolant entering the liquid inlet tank, thereby achieving a guided circulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 A schematic cross-sectional structure diagram of a mechanical seal structure provided by an embodiment of the present invention is shown;

[0023] Figure 2 A schematic diagram of the structure of the combination of a dynamic ring and a static ring provided in an embodiment of the present invention is shown.

[0024] In the figure: 1. rotating shaft; 2. moving ring; 201. liquid inlet groove; 2011. liquid inlet inner ring wall; 202. liquid outlet groove; 2021. liquid outlet outer ring wall; 3. stationary ring; 301. liquid inlet; 302. liquid outlet; 303. limiting ring; 4. spring seat; 401. guide ring wall; 5. compression spring; 6. coolant tank; 601. liquid outlet pipe; 602. liquid inlet pipe. DETAILED DESCRIPTION

[0025] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0026] The mechanical seal structure in the prior art is mainly composed of a rotating shaft 1, a dynamic ring 2 and a static ring 3, and a cooling groove is also provided in the structure of the dynamic ring 2. However, this type of cooling groove is usually in the form of injecting and circulating the coolant with the help of a pump body. This form requires more external force to realize the circulation of the coolant. In order to avoid this problem, the following technical solution is adopted.

[0027] like Figure 1 and 2 As shown;

[0028] Dynamic Ring 2

[0029] The structure of the moving ring 2 is mainly adapted and sleeved on the rotating shaft 1, and with the help of the rotation of the rotating shaft 1, it rotates in conjunction with the rotating shaft 1. Among them, a coaxially arranged liquid inlet groove 201 and a liquid outlet groove 202 are provided on one end face of the moving ring 2. It should be noted that the shapes of the liquid inlet groove 201 and the liquid outlet groove 202 are not necessarily required to be circular rings, but can be set to square rings or other shapes, preferably circular rings.

[0030] A first connecting hole and a second connecting hole are provided between the liquid inlet groove 201 and the liquid outlet groove 202 . The liquid inlet groove 201 and the liquid outlet groove 202 are connected by means of the first connecting hole and the second connecting hole. The cross-sectional shape of the first connecting hole and the second connecting hole is preferably circular.

[0031] Among them, the inner liquid inlet wall 2011 of the liquid inlet groove 201 is tilted, and preferably, the inclination degree of the inner liquid inlet wall 2011 is set to 45°, and the outer liquid outlet wall 2021 of the liquid outlet groove 202 is tilted, and preferably, the inclination degree of the outer liquid outlet wall 2021 is set to 45°.

[0032] Static ring 3

[0033] The stationary ring 3 is adapted to be fitted with the dynamic ring 2 , wherein a liquid inlet 301 and a liquid outlet 302 are provided on the stationary ring 3 , and a limit ring 303 is provided on the end face of the stationary ring 3 .

[0034] Embodiment 1: A mechanical seal structure comprises a rotating shaft 1, a dynamic ring 2 sleeved on the rotating shaft 1, and a static ring 3 fitted with the dynamic ring 2, wherein the static ring 3 is respectively provided with a liquid inlet 301 and a liquid outlet 302; the dynamic ring 2 is provided with two concentrically arranged liquid inlet grooves 201 and liquid outlet grooves 202, the liquid inlet grooves 201 and the liquid outlet grooves 202 are connected to each other, the liquid inlet groove 201 is coaxially arranged with the rotating shaft 1, and the liquid inlet groove 201 is coaxially arranged with the rotating shaft 1, wherein the coolant is suitable for being injected into the liquid outlet groove 202 from the liquid inlet groove 201 through the rotation of the rotating shaft 1 by centrifugation.

[0035] The rotating shaft 1 drives the moving ring 2 to rotate relative to the stationary ring 3, and the working process is simple and fast; the circulation of the coolant and the overall good cooling effect are achieved through the mutual adaptation between the liquid inlet 301, the liquid outlet 302, the liquid inlet groove 201 and the liquid outlet groove 202; the liquid inlet groove 201, the liquid outlet groove 202 and the rotating shaft 1 are coaxially arranged, which is convenient for providing a good centrifugal force for the coolant entering the liquid inlet groove 201, thereby achieving the effect of guided circulation.

[0036] In some embodiments, the liquid inlet groove 201 and the liquid outlet groove 202 are connected to each other through a first connecting hole and a second connecting hole; the liquid inlet inner ring wall 2011 of the liquid inlet groove 201 is inclined, and the intersection of the central axis of the first connecting hole and the central axis of the liquid inlet port 301 on the liquid inlet inner ring wall 2011 of the liquid inlet groove 201 is located at the same horizontal position; the liquid outlet outer ring wall 2021 of the liquid outlet groove 202 is inclined, and the intersection of the central axis of the second connecting hole and the central axis of the liquid outlet port 302 on the liquid outlet outer ring wall 2021 of the liquid outlet groove 202 is located at the same horizontal position.

[0037] This arrangement is to ensure that the coolant injected from the liquid inlet 301 can rush straight into the first connecting hole after hitting the liquid inlet inner wall 2011, that is, the incident angle is equal to the reflection angle to ensure that the entire coolant can be injected into the liquid outlet groove 202 faster and better. Similarly, the coolant flowing out of the second connecting hole can also rush straight into the liquid outlet 302 after hitting the liquid outlet outer wall 2021, that is, the incident angle is equal to the reflection angle to ensure that the entire coolant can be discharged from the liquid outlet groove 202 faster and better.

[0038] It should be noted that, because the dynamic ring 2 rotates continuously, the liquid inlet 301 and the first connecting hole cannot be aligned continuously, and the liquid outlet 302 and the second connecting hole cannot be aligned continuously either. Here, it is only to ensure that the injection position of the coolant is always on a circular track line of the liquid inlet inner ring wall 2011, and when the coolant is injected from the liquid inlet groove 201 into the liquid outlet groove, its discharge position is also always on a circular track line of the liquid outlet outer ring wall 2021. This promotes the circulation of the overall coolant.

[0039] In some embodiments, preferably, the inclination angle of the liquid inlet inner wall 2011 and the liquid outlet outer wall 2021 is 45°. By selecting 45°, the coolant can hit the side wall of the liquid inlet groove 201 horizontally and hit the side wall of the liquid outlet groove 202 vertically.

[0040] In some embodiments, the mechanical seal structure further includes a spring seat 4 sleeved on the rotating shaft 1 and a compression spring 5 sleeved on the rotating shaft 1, one end of the compression spring 5 abuts against the spring seat 4, and the other end abuts against the end surface of the dynamic ring 2. The arrangement of the compression spring 5 facilitates a better fit between the dynamic ring 2 and the static ring 3, and prevents leakage of the coolant during continuous flow.

[0041] In some embodiments, a guide ring wall 401 is provided at one end face of the spring seat 4, and the outer ring of the dynamic ring 2 is fitted with the inner ring of the guide ring wall 401. The guide ring wall 401 is selected because the compression spring 5 is in a compressed state, and if it is subjected to an impact force, it is easy to be squeezed again or reset after being squeezed. Under the guiding effect of the guide ring wall 401, it can play a good guiding effect and avoid the dynamic ring 2 from being misplaced.

[0042] In some embodiments, a stop ring 303 is provided at the fitting end surface of the static ring 3, and the dynamic ring 2 is clamped in the stop ring 303. The setting of the stop ring 303 has the following beneficial effects:

[0043] 1. Cooperate with the guide ring wall 401 to achieve good guiding sliding and circumferential limiting effects;

[0044] 2. Because there is some leakage of coolant between the gap between the dynamic ring 2 and the static ring 3, the setting of the limit ring 303 can effectively prevent the leakage of coolant and ensure the overall good sealing performance.

[0045] Embodiment 2: Embodiment 2 is based on Embodiment 1.

[0046] The mechanical seal structure also includes a coolant tank 6 , a negative pressure is formed inside the coolant tank 6 , a liquid outlet pipe 601 of the coolant tank 6 is connected and communicated with the liquid inlet 301 , and a liquid inlet pipe 602 of the coolant tank 6 is connected and communicated with the liquid outlet 302 .

[0047] The adoption of the above technical solution has the following advantages: when internal liquid or other situations leak due to wear of the mechanical seal, the presence of the cooling box can effectively squeeze the leaked liquid into the mechanical seal, thereby avoiding leakage to the outside.

[0048] Moreover, because of the existence of negative pressure, the external atmospheric pressure causes the dynamic ring 2 to fit onto the static ring 3, thereby ensuring a good sealing effect.

[0049] With the arrangement of the stationary ring 3 and the dynamic ring 2, when the rotating shaft 1 rotates, the coolant flows from the water inlet groove to the water outlet groove under the action of centrifugal force, achieving a good guided centrifugal effect, thereby driving the coolant to circulate.

[0050] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mechanical seal structure, comprising a rotating shaft (1), a moving ring (2) sleeved on the rotating shaft (1), and a stationary ring (3) fitted with the moving ring (2), characterized in that: The stationary ring (3) is provided with a liquid inlet (301) and a liquid outlet (302), respectively; the movable ring (2) is provided with two concentrically arranged liquid inlet grooves (201) and liquid outlet grooves (202), the liquid inlet grooves (201) and the liquid outlet grooves (202) are interconnected, and the liquid inlet grooves (201) and the liquid outlet grooves (202) are coaxially arranged; and The liquid inlet groove (201) is coaxially arranged with the rotating shaft (1), wherein The cooling liquid is suitable for being injected into the liquid outlet groove (202) through the rotation of the rotating shaft (1) from the liquid inlet groove (201); The liquid inlet groove (201) and the liquid outlet groove (202) are connected to each other via a first connecting hole and a second connecting hole; The liquid inlet inner wall (2011) of the liquid inlet groove (201) is inclined, and the intersection of the central axis of the first connecting hole and the central axis of the liquid inlet (301) on the liquid inlet inner wall (2011) of the liquid inlet groove (201) is located at the same horizontal position; The liquid outlet outer ring wall (2021) of the liquid outlet groove (202) is inclined, and the intersection point of the central axis of the second connecting hole and the central axis of the liquid outlet (302) on the liquid outlet outer ring wall (2021) of the liquid outlet groove (202) is located at the same horizontal position; The inclination angle of the liquid inlet inner ring wall (2011) and the liquid outlet outer ring wall (2021) is 45°.

2. The mechanical seal structure according to claim 1, characterized in that: The mechanical seal structure further comprises a spring seat (4) sleeved on the rotating shaft (1) and a compression spring (5) sleeved on the rotating shaft (1), one end of the compression spring (5) abutting against the spring seat (4) and the other end abutting against the end surface of the moving ring (2).

3. The mechanical seal structure according to claim 2, characterized in that: A guide ring wall (401) is provided at one end surface of the spring seat (4), and the outer ring of the moving ring (2) is in contact with the inner ring of the guide ring wall (401).

4. The mechanical seal structure according to claim 1, characterized in that: A limiting ring (303) is provided at the fitting end surface of the static ring (3), and the dynamic ring (2) is clamped in the limiting ring (303).

5. The mechanical seal structure according to claim 1, characterized in that: The mechanical seal structure further comprises a coolant tank (6), a negative pressure is formed inside the coolant tank (6), a liquid outlet pipe (601) of the coolant tank (6) is connected and communicated with the liquid inlet (301), and a liquid inlet pipe (602) of the coolant tank (6) is connected and communicated with the liquid outlet (302).

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