Mechanical sealing device for conveying medium containing medium and small particles

Abstract

The utility model relates to a mechanical sealing device for conveying medium containing medium and small particles, the mechanical sealing device comprises a non-compensation ring, a compensation ring and a compensation ring seat, the compensation ring seat is fixed with a rotating shaft, the compensation ring is fixed on the compensation ring seat, a plurality of springs are arranged between the compensation ring seat and the compensation ring, and the non-compensation ring is fixed on the compensation ring seat. The springs are annularly and evenly distributed around the axis of the rotating shaft and push the compensation ring to abut against the non-compensation ring. A plurality of large springs are used, so that the stability of the mechanical seal is ensured. And a positioning gasket is adopted to ensure that the mechanical seal is in a containerization mode. The spring is internally arranged, the screw pitch of the spring is large, small and medium particles are not prone to blocking the large spring, and the spring is large in wire diameter and not prone to corrosion.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a mechanical seal device for conveying a medium containing small and medium particles. Background Art

[0002] Centrifugal pumps, centrifuges, reactors, compressors and other equipment used to transport gas or liquid media generally require mechanical seals, which are shaft sealing devices used in rotating fluid machinery. For mechanical seals containing small and medium particles in some media, the existing technology generally uses a large spring device, which is used to fit the compensation ring and the non-compensation ring to achieve a sealing effect. However, mechanical seals with large spring devices will have unstable spring force at high speeds, resulting in seal failure. Utility Model Content

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a mechanical sealing device for conveying medium containing small and medium particles.

[0004] In order to achieve the purpose of the utility model, the present application provides the following technical solutions.

[0005] In a first aspect, the present application provides a mechanical sealing device for conveying a medium containing small and medium-sized particles, characterized in that the mechanical sealing device comprises a non-compensating ring, a compensating ring and a compensating ring seat, the compensating ring seat is fixed to a rotating shaft, the compensating ring is fixed on the compensating ring seat, and a plurality of springs are arranged between the compensating ring seat and the compensating ring, all of the springs are evenly distributed in a ring shape around the axis of the rotating shaft, and the springs push the compensating ring to abut against the non-compensating ring.

[0006] In one embodiment of the first aspect, the compensation ring includes a main body and a plurality of screws, a mounting ring perpendicular to the axis of the rotating shaft is provided in the middle of the main body, a plurality of threaded through holes are evenly arranged on the mounting ring, the screws are fixed in the threaded through holes, and the screws are parallel to the axis of the rotating shaft, and the spring sleeve is arranged on the outside of the screws.

[0007] In an implementation manner of the first aspect, the screw rod comprises a head portion, a threaded portion, a hexagonal wrench portion and a rod insertion portion in sequence from the top end to the tail end, and the threaded portion matches the threaded through hole.

[0008] In one embodiment of the first aspect, the top center of the compensation ring seat is a hollow structure, the tail end of the compensation ring is inserted into the hollow structure at the top of the compensation ring seat, the tail end of the compensation ring seat is fixed to the rotating shaft by a top screw, and the insertion rod portion is inserted in the compensation ring seat.

[0009] In one embodiment of the first aspect, an insert ring perpendicular to the axis of the rotating shaft is provided in the middle of the compensation ring seat, and a plurality of insertion holes are evenly arranged on the insert ring. The insertion rod portion of the screw rod is slidably inserted in the insertion hole, the tail end of the spring abuts against the top side of the insert ring, and the top end of the spring abuts against the tail end side of the mounting ring.

[0010] In one implementation of the first aspect, an O-ring is provided between the compensation ring and the hollow structure of the compensation ring seat.

[0011] In an implementation manner of the first aspect, a mounting groove is provided between the head portion and the threaded portion of the screw, and a positioning washer is installed in the mounting groove.

[0012] In an implementation of the first aspect, the number of the springs is ≥8.

[0013] In one embodiment of the first aspect, the pitch of the spring is 8-12 mm, and the outer diameter of the spring is 20-40 mm. For mechanical seals, small spring mechanical seals are rarely used when the material diameter is between 3 and 5 mm, because the material will enter the small spring and block the spring so that the spring has no compensation. The pitch of the spring of the present application is 8-12 mm, and the material entering the spring can be brought out as it rotates, so it can be called a "large spring".

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] This application uses multiple large springs to ensure the stability of the mechanical seal. A positioning gasket is used to ensure that the mechanical seal is a container type. The spring is built-in, and the spring pitch is large to ensure that small and medium particles are not easy to block the large spring. The spring wire diameter is large and not easy to corrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic cross-sectional structure diagram of the mechanical sealing device of the present application;

[0017] Figure 2 Schematic diagram of the screw structure.

[0018] In the accompanying drawings, 1 is a compensation ring, 2 is a compensation ring seat, 3 is a non-compensation ring, 4 is a stationary ring, 5 is a rotating shaft, 6 is a screw, 7 is a spring, 8 is a top screw, 9 is an insert ring, 10 is a socket, 11 is a hollow structure, 12 is a mounting ring, 13 is a threaded through hole, 14 is a positioning washer, 15 is a non-compensation ring sealing ring, 16 is a head, 17 is a mounting groove, 18 is a threaded portion, 19 is a hexagonal wrench portion, 20 is an insert rod portion, and 21 is an O-ring. DETAILED DESCRIPTION

[0019] Unless otherwise defined, the technical terms or scientific terms used in this specification and claims shall have the ordinary meanings understood by persons with ordinary skills in the technical field to which the utility model belongs. All the values ​​from the lowest value to the highest value listed in this article refer to all the values ​​obtained by incrementing one unit between the lowest value and the highest value when the difference between the lowest value and the highest value is more than two units.

[0020] The following will describe the specific implementation of the utility model. It should be noted that in the specific description of these implementations, in order to provide a concise description, this specification cannot provide a detailed description of all the features of the actual implementation. Without departing from the spirit and scope of the utility model, those skilled in the art may modify and replace the implementation of the utility model, and the resulting implementation is also within the scope of protection of the utility model.

[0021] For some mechanical seals containing small and medium particles in the medium, the existing technology generally uses a large spring device, but the large spring mechanical seal will have unstable spring force at high speeds, resulting in seal failure. In view of this situation, the utility model uses multiple large springs to stabilize the spring force and ensure the stability of the mechanical seal. The device is mainly used in agitators or pumps in general chemical processes, petrochemicals, pharmaceuticals, food, and other industries.

[0022] The utility model is composed of a spring, a screw, an O-ring, a compensation ring seat, a top screw, a positioning gasket, a compensation ring, a non-compensation ring, a non-compensation ring sealing ring, etc., wherein the top screw fixes the compensation ring seat on the rotating shaft, and multiple springs push the compensation ring and the non-compensation ring to fit together. When the mechanical seal works normally, a gap is left between the positioning gasket and the compensation ring seat. When the sealing end face is worn, the spring pushes the compensation ring to compensate so that the sealing end face is always in fit.

[0023] When the rotating shaft of the utility model rotates, the compensation ring seat is driven to rotate. The compensation ring seat and the screw rod are connected together by insertion and injection. The compensation ring seat drives the screw rod to rotate, thereby driving the compensation ring to rotate.

[0024] The left end of the screw of the utility model is threaded and used to connect with the compensation ring. The middle part is hexagonal and can be tightened with an open-end wrench. The left end is slotted for installing a positioning gasket. When the seal is not installed, the positioning gasket fits with the compensation ring to ensure that the mechanical seal is a semi-container type. The so-called semi-container is mainly used on-site to directly push the mechanical seal into the sealing cavity. If it is non-containerized, it needs to be installed one by one into the pump cavity, which is more difficult to install on-site. When the seal is pushed to the working height, the positioning gasket is pushed out. When the sealing surface is worn, the spring compensation can make the compensation ring and the non-compensation ring fit together, and the screw plays the role of transmitting torque and centering the spring.

[0025] When the medium contains particles, the small and medium particles will not block the spring because the spring pitch is large, and when the compensation ring rotates, the small and medium particles will be directly thrown out under the action of centrifugal force, avoiding spring blockage. The utility model installs more than 8 springs in one circle, ensuring that the compensation ring is evenly stressed and can be used in situations with higher rotation speeds.

[0026] Example

[0027] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented based on the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0028] Example 1

[0029] A mechanical sealing device for conveying medium containing small and medium particles, the structure of which is as follows Figure 1 The mechanical seal device disclosed in this application is only a part of the existing mechanical seal. The existing mechanical seal includes the shaft sleeve, cavity, dynamic ring, static ring, end cover and other structures, which are not the improvement points of this application. The mechanical seal device of this application is only aimed at the improvement of the compensation ring and non-compensation ring structure in the mechanical seal, which are as follows:

[0030] The mechanical seal device of the present application includes three parts: a compensation ring seat 2, a compensation ring 1, and a non-compensation ring 3. The rear end of the compensation ring seat 2 is fixed to the main shaft by a top screw 8 and sealed by a sealing ring. The top center of the compensation ring seat 2 is a hollow structure 11, and the rear end of the compensation ring 1 is inserted into the hollow structure 11 at the top of the compensation ring seat 2, and a plurality of O-rings 21 are arranged between the two. The middle part of the compensation ring seat 2 is provided with an insert ring 9 perpendicular to the axis of the rotating shaft 5, and 8 insert holes 10 are evenly arranged on the insert ring 9.

[0031] The compensation ring 1 includes a body and a plurality of screw rods 6. A mounting ring 12 perpendicular to the axis of the rotating shaft 5 is provided in the middle of the body. Eight threaded through holes 13 are evenly formed on the mounting ring 12. The eight screw rods 6 are respectively fixed in the threaded through holes 13, and the screw rods 6 are parallel to the axis of the rotating shaft 5. The structure of each screw rod 6 is as follows: Figure 2As shown, from the top to the tail, it includes a head 16, a threaded portion 18, a hexagonal wrench portion 19 and a rod insertion portion 20. The threaded portion 18 matches the threaded through hole 13, and the screw 6 is fixed on the compensation ring 1 through the threaded portion 18 and the threaded through hole 13. The hexagonal wrench portion 19 can be used to tighten the above-mentioned threaded connection with an open-end wrench. The rod insertion portion 20 is slidably inserted into the insertion hole 10 of the insert ring 9, and the spring 7 is sleeved on the outside of the screw 6. The tail end of the spring 7 abuts against the top side of the insert ring 9, and the top of the spring 7 abuts against the tail end side of the mounting ring 12. A mounting groove 17 is provided between the head 16 and the threaded portion 18 of the screw 6, and a positioning washer 14 is installed in the mounting groove 17.

[0032] The non-compensating ring 3 is sleeved on the rotating shaft 5 and fixed to the center of the tail end of the static ring 4, and a non-compensating ring sealing ring 15 is arranged between the static ring 4. The tail end side of the non-compensating ring 3 fits with the top side of the compensating ring 1 to form a sealing surface.

[0033] During operation, due to the presence of the top screw 8, the compensation ring seat 2 rotates with the rotating shaft 5, and drives the compensation ring 1 to rotate together through the screw 6, while the non-compensation ring 3 is fixed on the static ring 4 and does not rotate with the rotating shaft 5. Therefore, wear will gradually appear between the non-compensation ring 3 and the compensation ring 1. At this time, the elastic force of the spring 7 acts on the compensation ring 1, pushing the compensation ring 1 to close to the non-compensation ring 3, thereby ensuring that the compensation ring 1 and the non-compensation ring 3 always remain in close contact. In addition, the 8 large springs used in this application are built-in with spring 7, and the pitch of spring 7 is large, which ensures that small and medium particles are not easy to block the large springs. The wire diameter of spring 7 is large and not easy to corrode.

[0034] The above description of the embodiments is to facilitate those of ordinary skill in the art to understand and apply the present application. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without having to pay creative labor. Therefore, the present application is not limited to the embodiments herein, and improvements and modifications made by those skilled in the art based on the contents disclosed in the present application without departing from the scope and spirit of the present application are within the scope of the present application.

Claims

1. A mechanical sealing device for conveying medium containing small and medium particles, characterized in that: The mechanical sealing device includes a non-compensating ring, a compensating ring and a compensating ring seat. The top center of the compensating ring seat is a hollow structure. The tail end of the compensating ring is inserted into the hollow structure at the top of the compensating ring seat. The tail end of the compensating ring seat is fixed to the rotating shaft by a top screw. The compensating ring seat is fixed to the rotating shaft. The compensating ring is fixed to the compensating ring seat. The insert rod portion is inserted in the compensating ring seat. The middle part of the compensating ring seat is provided with an insert ring perpendicular to the axis of the rotating shaft. A plurality of insert holes are evenly arranged on the insert ring. The compensating ring includes a body and a plurality of screws. The middle part of the body is provided with a mounting ring perpendicular to the axis of the rotating shaft. A plurality of holes are evenly arranged on the mounting ring. A threaded through hole, the screw rod comprises a head, a threaded portion, a hexagonal wrench portion and an insertion rod portion from the top to the tail, the threaded portion matches the threaded through hole, and the screw rod is fixed in the threaded through hole, the insertion rod portion of the screw rod is slidably inserted in the insertion hole, the screw rod is parallel to the axis of the rotating shaft, and a plurality of springs are arranged between the compensation ring seat and the compensation ring, the spring sleeve is arranged on the outside of the screw rod, all the springs are evenly distributed in a ring shape around the axis of the rotating shaft, the tail end of the spring abuts against the top side of the insertion ring, the top of the spring abuts against the tail end side of the mounting ring, and the spring pushes the compensation ring to abut against the non-compensation ring.

2. The mechanical sealing device for conveying medium containing small and medium particles according to claim 1, characterized in that: An O-ring is arranged between the compensation ring and the hollow structure of the compensation ring seat.

3. The mechanical sealing device for conveying medium containing small and medium particles according to claim 1, characterized in that: A mounting groove is provided between the head and the threaded portion of the screw rod, and a positioning washer is installed in the mounting groove.

4. The mechanical sealing device for conveying medium containing small and medium particles according to any one of claims 1 to 3, characterized in that: The number of the springs is ≥8.

5. The mechanical sealing device for conveying medium containing small and medium particles according to claim 4, characterized in that: The pitch of the spring is 8-12 mm, and the outer diameter of the spring is 20-40 mm.

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