Sealing structure and circulation pump

Abstract

The present invention relates to the field of mechanical seals, and discloses a sealing structure and a circulating pump. The sealing structure comprises a shell (10), a cover (20) connected to the shell, and a T-shaped lens pad (30) arranged at a connection position between the shell and the cover, wherein the T-shaped lens pad comprises a head (31) having an arcuate surface and a rib (32) extending from the head, a first inclined surface is formed on the shell, and a second inclined surface corresponding to the first inclined surface is formed on the cover, wherein the T-shaped lens pad is connected so that the arcuate surface is in sealing contact with the first inclined surface and the second inclined surface and the rib is inserted between the shell and the cover, a first winding gasket (11) is arranged between the rib and the shell, and a second winding gasket (21) is arranged between the rib and the cover. The winding gasket in the present invention plays a sealing role after the first sealing surface fails, thereby ensuring the airtightness of the sealing structure.

Description

Technical Field

[0001] The present invention relates to the field of mechanical seals, and in particular to a sealing structure. The present invention also relates to a circulating pump. Background Art

[0002] The sealing of high-temperature, high-pressure equipment in industries like petrochemicals and coal chemical industry typically utilizes a self-sealing T-shaped lens gasket. The T-shaped lens gasket's spherical sealing surface contacts the equipment's conical sealing surface, initially forming a circular ring. Under the action of a preload, the T-shaped lens gasket plastically deforms at the contact point, transforming the circular ring into a band, resulting in improved sealing performance.

[0003] However, in the existing technology, it is impossible to inspect and test the sealing effect of the T-type lens gasket before the equipment is started. Only after the reaction system is pressurized and heated up can it be found whether the sealing of the T-type circulation pump lens gasket has failed. If leakage is found in the sealing of the T-type lens gasket, it is necessary to tighten the bolts to the final standard torque according to the design requirements. When the final tightening of the bolts is ineffective, the sealing surface of the T-type lens gasket can be inspected and replaced only after the equipment is cooled and depressurized. When pressure fluctuations occur during the operation of the equipment, the sealing of the T-type lens gasket of the reaction circulation pump is prone to leakage. In the actual production process, it is impossible to seal the leak during the operation of the equipment. The leak can only be treated after the device system is shut down, which seriously affects the economic benefits of the enterprise. Summary of the Invention

[0004] The purpose of the present invention is to overcome the problem in the prior art that leakage easily occurs at the sealing portion of a T-shaped lens pad, and to provide a sealing structure having the advantage of good sealing effect.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a sealing structure on the one hand, which includes a shell, a cover body connected to the shell, and a T-shaped lens pad arranged at the connection position between the shell and the cover body, the T-shaped lens pad includes a head with a curved surface and a rib extending from the head, a first inclined surface is formed on the shell, and a second inclined surface corresponding to the first inclined surface is formed on the cover body, the T-shaped lens pad is connected so that the curved surface is in sealing contact with the first inclined surface and the second inclined surface and the rib plate is inserted between the shell and the cover body, a first winding gasket is arranged between the rib plate and the shell, and a second winding gasket is arranged between the rib plate and the cover body.

[0006] Optionally, a first sealed cavity is formed between the first inclined surface, the curved surface and the upper surface of the rib plate, a first mounting hole is provided on the side of the shell, and the first mounting hole is connected to the first sealed cavity; a second sealed cavity is formed between the second inclined surface, the curved surface and the lower surface of the rib plate, a second mounting hole is provided on the side of the cover body, and the second mounting hole is connected to the second sealed cavity.

[0007] Optionally, the sealing structure includes a plurality of first mounting holes arranged along the circumference of the shell, and a plurality of second mounting holes arranged along the circumference of the cover.

[0008] Optionally, the lower end surface of the shell is formed with a plurality of first arc grooves arranged circumferentially and not connected to each other, and the first mounting hole is connected to the first sealed cavity through the first arc groove; the upper end surface of the cover body is formed with a plurality of second arc grooves arranged circumferentially and not connected to each other, and the second mounting hole is connected to the second sealed cavity through the second arc groove.

[0009] Optionally, a one-way valve capable of limiting the discharge of gas in the first sealed cavity is provided in the first mounting hole, and the one-way valve capable of limiting the discharge of gas in the second sealed cavity is provided in the second mounting hole.

[0010] Optionally, the one-way valve includes a valve body with a through hole, a spring base with a boss, a valve core, a spring and a retaining spring, the valve core includes a connecting portion with a valve core countersunk hole and a conical surface, and a valve stem extending horizontally from the connecting portion, the valve core is connected to the valve body through the conical surface, and the valve stem is located in the through hole, one end of the spring is connected to the valve core countersunk hole and the other end is connected to the outside of the boss, and the retaining spring is arranged on the side of the spring base opposite to the boss to limit the movement of the spring base.

[0011] Optionally, the one-way valve is connected to the first mounting hole and the second mounting hole through threads, and is sealed between the first mounting hole and the second mounting hole through an O-ring.

[0012] Optionally, the sealing structure includes a sealing plug threadedly connected to the first mounting hole and the second mounting hole, the sealing plug is sealed between the first mounting hole and the second mounting hole through a sealing gasket, and the end of the sealing plug is processed with an external hexagonal nut.

[0013] Optionally, the sealing structure includes a pressure detection device, which can be connected to the first sealing cavity through the first mounting hole to detect the pressure inside the first sealing cavity, and the pressure detection device can be connected to the second sealing cavity through the second mounting hole to detect the pressure inside the second sealing cavity.

[0014] A second aspect of the present invention provides a circulation pump, which includes the above-mentioned sealing structure.

[0015] In this invention, a curved T-shaped lens gasket forms a first sealing surface on the inclined surfaces of the housing and cover, preventing the accommodating cavity formed between the housing and cover from communicating with the outside world. Furthermore, a first wound gasket is positioned between the housing and the rib plate, and a second wound gasket is positioned between the cover and the rib plate. If the first sealing surface fails, the wound gaskets provide a seal, further ensuring the airtightness of the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the sealing structure of the present invention;

[0017] Figure 2 yes Figure 1 An enlarged schematic diagram of point I in the middle;

[0018] Figure 3 yes Figure 2 The enlarged schematic diagram of II in the middle;

[0019] Figure 4 yes Figure 3 Right side view of the middle valve core.

[0020] Description of Reference Numerals

[0021] 10-housing; 11-first spiral wound gasket; 20-cover; 21-second spiral wound gasket; 30-T-type lens pad; 31-head; 32-rib plate; 40-one-way valve; 41-valve body; 42-spring base; 43-valve core; 431-valve core countersunk hole; 432-valve stem; 44-spring; 45-circlip; 50-sealing plug. DETAILED DESCRIPTION

[0022] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0023] In the present invention, unless otherwise specified, directional terms such as "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0024] like Figure 1 and Figure 2As shown, the present invention provides a sealing structure, which includes a shell 10, a cover body 20 connected to the shell 10, and a T-shaped lens pad 30 arranged at a connection position between the shell 10 and the cover body 20, the T-shaped lens pad 30 includes a head 31 with a curved surface and a rib 32 extending from the head 31, a first inclined surface is formed on the shell 10, and a second inclined surface corresponding to the first inclined surface is formed on the cover body 20, the T-shaped lens pad 30 is connected so that the curved surface is in sealing contact with the first inclined surface and the second inclined surface and the rib 32 is inserted between the shell 10 and the cover body 20, a first winding gasket 11 is arranged between the rib 32 and the shell 10, and a second winding gasket 21 is arranged between the rib 32 and the cover body 20.

[0025] Specifically, a accommodating cavity is formed between the shell 10 and the cover body 20, and the curved surface of the T-shaped lens pad 30 is in sealing contact with the first inclined surface and the second inclined surface to form a first sealing surface, so that the accommodating cavity is not connected to the outside world. In a preferred embodiment of the present invention, a first groove is formed on the lower end surface of the shell 10, and a second groove is formed on the upper end surface of the cover body 20. The first winding gasket 11 is arranged in the first groove, and the second winding gasket 21 is arranged in the second groove. In this arrangement, after the first sealing surface fails, the first winding gasket 11 and the second winding gasket 21 fill the gap between the upper and lower surfaces of the rib plate 32 and the shell 10 or the cover body 20, further improving the reliability of the sealing structure. It can be understood that the first winding gasket 11 and the second winding gasket 21 can also be arranged between the shell 10 and the cover body 20, without contacting the rib plate 32, and the same sealing effect can be achieved.

[0026] In the present invention, a T-shaped lens gasket 30 with an arcuate surface is used to form a first sealing surface on the inclined surfaces of the housing 10 and the cover 20, thereby preventing the accommodating cavity formed between the housing 10 and the cover 20 from communicating with the outside world. Furthermore, a first wound gasket 11 is provided between the housing 10 and the rib 32, and a second wound gasket 21 is provided between the cover 20 and the rib 32. If the first sealing surface fails (is damaged or leaks), the wound gasket acts as a seal, further ensuring the airtightness of the sealing structure and effectively extending the operating time of the device. Furthermore, there is no need to wait for the device to cool down and reduce pressure before performing a seal inspection, thereby improving the reliability of the device.

[0027] Furthermore, a first sealed cavity is formed between the first inclined surface, the curved surface, and the upper surface of the rib plate 32. A first mounting hole is provided on the side of the housing 10, and the first mounting hole is connected to the first sealed cavity. A second sealed cavity is formed between the second inclined surface, the curved surface, and the lower surface of the rib plate. A second mounting hole is provided on the side of the cover body 20, and the second mounting hole is connected to the second sealed cavity. It is understood that in one embodiment of the present invention, the mounting hole can be directly connected to the sealed cavity, or a detection groove having a size greater than the thickness of the rib plate 32 can be provided on the outer side of the rib plate 32, and the mounting hole is connected to the sealed cavity through the detection groove.

[0028] In addition, the sealing structure includes a plurality of first mounting holes arranged circumferentially along the shell 10, and a plurality of second mounting holes arranged circumferentially along the cover body 20. Furthermore, the lower end surface of the shell 10 is formed with a plurality of first arc grooves arranged circumferentially and not connected to each other, and the first mounting holes are connected to the first sealing cavity through the first arc grooves; the upper end surface of the cover body 20 is formed with a plurality of second arc grooves arranged circumferentially and not connected to each other, and the second mounting holes are connected to the second sealing cavity through the second arc grooves. Specifically, when the first sealing surface fails, the leak can be sealed through the first mounting hole or the second mounting hole. A plurality of arc grooves that are not connected to each other are provided on the lower end surface of the shell 10 and the upper end surface of the cover body 20, so that the leak can be accurately located, and the sealing material can be injected into the arc groove of the leak through the mounting holes, so that the equipment can continue to work without stopping.

[0029] In one embodiment of the present invention, a one-way valve 40 capable of limiting the discharge of gas in the first sealing cavity is provided in the first mounting hole, and the one-way valve 40 capable of limiting the discharge of gas in the second sealing cavity is provided in the second mounting hole. Specifically, when the first sealing surface fails, the sealing material can be injected into the leaking part through the one-way valve 40, or the one-way valve 40 can be removed and the leaking part can be sealed through the mounting hole. In a preferred embodiment of the present invention, the one-way valve 40 includes a valve core, and the valve core protrudes from the end face of the one-way valve 40, and the protruding distance is linearly proportional to the pressure in the sealing cavity, that is, the protruding distance at the position of the sealing leakage is greater than the sealing position, so that the specific leakage position can be judged by the protruding distance.

[0030] like Figure 3 and Figure 4As shown in FIG. , in another embodiment of the present invention, a one-way valve 40 includes a valve body 41 with a through-hole, a spring base 42 with a boss, a valve core 43, a spring 44, and a retaining spring 45. The valve core 43 includes a connecting portion with a valve core counterbore 431 and a tapered surface, and a valve stem 432 extending horizontally from the connecting portion. The valve core 43 is connected to the valve body 41 via the tapered surface, and the valve stem 432 is positioned within the through-hole. One end of the spring 44 is connected to the valve core counterbore 431, and the other end is connected to the outside of the boss. The retaining spring 45 is disposed on the side of the spring base 42 opposite the boss to restrict movement of the spring base 42. In this embodiment, the spring base 42 is provided with a circular hole, and the valve stem 432 is provided with multiple arc-shaped grooves, protruding from the surface of the valve body 41. Preferably, the end of the valve body 41 is provided with an external hexagonal structure to facilitate installation, removal, and tightening of the one-way valve 40. Furthermore, the tapered surface on the valve core 43 is preferably 45°.

[0031] When sealing a leak, force is applied to the outside of the valve stem 432 to disconnect the conical surface of the valve stem 432 from the valve body 41. The sealing material can then enter the cavity between the spring base 42 and the connecting portion through the circular groove of the valve stem 432, and then pass through the circular hole in the spring base 42 into the circular groove on the end face of the housing 10 or the cover 20, thereby sealing the leak. This further achieves pressure-sealed leak plugging while the equipment is in operation, extending the safe operation time of the equipment. It is understood that in this embodiment, force can also be applied to the outside of the valve stem 432 to disconnect the conical surface of the valve stem 432 from the valve body 41, and a pressure instrument can be used to test the pressure in the mounting hole to determine whether the sealing surface of the T-shaped lens gasket 30 has failed, or to determine the specific location of the leak.

[0032] Furthermore, the first and second mounting holes are provided with internal threads, and the outer peripheral surface of the valve body 41 is provided with external threads. The one-way valve 40 is connected to the first and second mounting holes via threads and is sealed between the first and second mounting holes via O-rings. As a preferred embodiment, the threads can be sealing threads.

[0033] Continue to refer to Figure 3 The sealing structure includes a sealing plug 50 threadedly connected to the first and second mounting holes. The sealing plug 50 is sealed with a sealing gasket. To facilitate installation, tightening, and removal of the sealing plug 50, the end of the sealing plug 50 is machined with an external hexagonal nut. Furthermore, a groove is provided on the side of the sealing plug 50 near the one-way valve 40 to prevent interference with the valve stem 432.

[0034] In a preferred embodiment of the present invention, the sealing structure includes a pressure detection device, which can be connected to the first sealing cavity through the first mounting hole to detect the pressure in the first sealing cavity, and the pressure detection device can be connected to the second sealing cavity through the second mounting hole to detect the pressure in the second sealing cavity. Specifically, pressure detection can be performed at the mounting hole after the device is started to ensure whether the sealing of the T-shaped lens pad 30 is reliable. Similarly, pressurized gas can be injected into the interior of the device before the device is operated, and a pressure detection device can be used to detect the pressure at the mounting hole to ensure the reliability of the device seal. In addition, after the pressure in the device fluctuates, the pressure at that location can be measured through the mounting hole to determine the specific pressure leakage location, so as to seal the location.

[0035] A second aspect of the present invention provides a circulating pump comprising the aforementioned sealing structure. The circulating pump of the present invention and the aforementioned sealing structure have the same advantages over the prior art, which will not be elaborated upon here. It will be appreciated that the sealing structure of the present invention can be applied to any device requiring sealing, and is not limited to use in circulating pumps.

[0036] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, the technical solution of the present invention may be subjected to a variety of simple modifications, including combining the various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A sealing structure, characterized in that: The sealing structure comprises a shell (10), a cover (20) connected to the shell (10), and a T-shaped lens pad (30) arranged at a connection position between the shell (10) and the cover (20), the T-shaped lens pad (30) comprising a head (31) having an arcuate surface and a rib (32) extending from the head (31), a first inclined surface formed on the shell (10), a second inclined surface corresponding to the first inclined surface formed on the cover (20), the T-shaped lens pad (30) being connected so that the arcuate surface is in sealing contact with the first inclined surface and the second inclined surface and the rib (32) is inserted between the shell (10) and the cover (20), a first wound gasket (11) is arranged between the rib (32) and the shell (10), and a second wound gasket (21) is arranged between the rib (32) and the cover (20); A first sealed cavity is formed between the first inclined surface, the arc-shaped surface, and the upper surface of the rib plate (32); a first mounting hole is provided on the side of the shell (10), and the first mounting hole is communicated with the first sealed cavity; a second sealed cavity is formed between the second inclined surface, the arc-shaped surface, and the lower surface of the rib plate; a second mounting hole is provided on the side of the cover body (20), and the second mounting hole is communicated with the second sealed cavity; A one-way valve (40) capable of limiting the discharge of gas in the first sealed cavity is provided in the first mounting hole, and the one-way valve (40) capable of limiting the discharge of gas in the second sealed cavity is provided in the second mounting hole, the one-way valve (40) comprising a valve core (43), the valve core (43) protruding from the end surface of the one-way valve (40), and the protruding distance is linearly proportional to the pressure in the first sealed cavity and the second sealed cavity, so that a specific leakage position can be determined by the protruding distance.

2. The sealing structure according to claim 1, wherein: The sealing structure comprises a plurality of first mounting holes arranged along the circumference of the housing (10), and a plurality of second mounting holes arranged along the circumference of the cover (20).

3. The sealing structure according to claim 1, wherein: The lower end surface of the shell (10) is formed with a plurality of first arc grooves arranged circumferentially and not connected to each other, and the first mounting hole is connected to the first sealed cavity through the first arc groove; the upper end surface of the cover body (20) is formed with a plurality of second arc grooves arranged circumferentially and not connected to each other, and the second mounting hole is connected to the second sealed cavity through the second arc groove.

4. The sealing structure according to claim 1, wherein: The one-way valve (40) is connected to the first mounting hole and the second mounting hole through threads, and is sealed between the first mounting hole and the second mounting hole through an O-ring.

5. The sealing structure according to claim 1, wherein: The sealing structure comprises a sealing plug (50) threadedly connected to the first mounting hole and the second mounting hole, the sealing plug (50) being sealed between the first mounting hole and the second mounting hole via a sealing gasket, and an external hexagonal nut being machined at the end of the sealing plug (50).

6. The sealing structure according to claim 1, wherein: The sealing structure includes a pressure detection device, which can be connected to the first sealing cavity through the first mounting hole to detect the pressure in the first sealing cavity, and the pressure detection device can be connected to the second sealing cavity through the second mounting hole to detect the pressure in the second sealing cavity.

7. A circulation pump, comprising the sealing structure according to any one of claims 1 to 6.

Images