CN209943185U - Prevent dry grinding machine and seal structure - Google Patents

Abstract

The utility model discloses a sealing structure of a dry-proof mill, which comprises a pump cover and a pump shaft passing through the pump cover; further comprising: the sealing gland is penetrated on the pump shaft and is connected with the pump cover; the pump cover is connected with the pump body, and the pump body is tightly embraced with the pump shaft and used for conveying liquid in an isolating mode; the at least two second oil seals are connected to the sealing gland and used for forming a sealing cavity with the sealing gland, the pump cover, the pump shaft and the first oil seal; the mechanical seal is connected to the pump shaft and the seal gland and is arranged in the seal cavity; the two pipelines are connected to the sealing gland and communicated with the sealing cavity; the sealing ring is arranged in the first groove on the sealing gland and is used for being attached to the pump cover; therefore, the technical problem that the mechanical seal is dry-ground is solved, the mechanical seal is protected, the technical effect of conveying liquid is not influenced, and the practicability is high.

Description

Prevent dry grinding machine and seal structure

Technical Field

The utility model relates to a pump technical field, specific prevent dry grinding machine seal structure that says so.

Background

The pump is a machine for conveying fluid or pressurizing fluid, and transfers mechanical energy of a prime mover or other external energy to the liquid to increase the energy of the liquid; when liquid is conveyed, in order to ensure the sealing property, a mechanical sealing assembly is usually arranged between a pump cover and a pump shaft, so that the liquid is prevented from leaking and being sprayed to a motor to cause the damage of the motor; in the specific use process, at least the following defects are found to exist, in order to prevent the mechanical seal from being dry-ground and ensure the normal operation of the mechanical seal, clean circulating cooling water is usually introduced to flush and cool the mechanical seal, the circulating cooling water can be mixed into the conveyed liquid to cause the change of the liquid concentration and the like, or the conveyed liquid is adopted to directly flush and cool the mechanical seal, and the conveyed liquid cannot be clean water generally and is usually accompanied with impurities, so that the mechanical seal is easily damaged.

Disclosure of Invention

To the above-mentioned weak point that exists among the correlation technique, the utility model aims at providing a prevent dry grinding machine and seal structure to solve the technical problem that dry grinding can appear in the mechanical seal among the correlation technique.

The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is: a sealing structure of a dry-proof mill comprises a pump cover and a pump shaft penetrating through the pump cover; its structural feature is, still includes:

the sealing gland is penetrated on the pump shaft and is connected with the pump cover;

the pump cover is connected with the pump body, and the pump body is tightly embraced with the pump shaft and used for conveying liquid in an isolating mode;

the at least two second oil seals are connected to the sealing gland and used for forming a sealing cavity with the sealing gland, the pump cover, the pump shaft and the first oil seal;

the mechanical seal is connected to the pump shaft and the seal gland and is arranged in the seal cavity;

the two pipelines are connected to the sealing gland and communicated with the sealing cavity;

and the sealing ring is arranged in the first groove on the sealing gland and is used for being attached to the pump cover.

Further: the oil cup is connected to the pipeline and used for injecting lubricating oil into the sealed cavity.

Further: the pump shaft is positioned with the first oil seal through at least two threaded pins and used for blocking the second oil seal.

Further: the sealing gland comprises a first plate connected to the pump cover, and the side wall of the first plate is provided with two threaded through holes for connecting the pipelines;

a second plate connected to the first plate for positioning with the pump cap and for connecting the mechanical seal;

and the third plate is connected to the first plate and is used for connecting the second oil seal together with the first plate.

The utility model has the advantages that: compared with the related technology, the dry-proof mill sealing structure has the advantages that cooling water is introduced from a pipeline and enters a sealing cavity to wash and cool a mechanical seal; because the sealing cavity is a relatively sealed space formed by the sealing gland, the pump cover, the pump shaft, the first oil seal and the second oil seal and is isolated from the conveyed liquid, the conveyed liquid cannot be influenced, the mechanical seal is ensured not to be subjected to dry grinding, and the sealing effect is better; therefore, the technical problem that the mechanical seal is dry-ground is solved, the mechanical seal is protected, the technical effect of conveying liquid is not influenced, and the practicability is high.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;

fig. 2 is a partially enlarged view of a portion a of fig. 1 according to the present invention;

fig. 3 is a schematic structural diagram of a second embodiment of the present invention;

fig. 4 is a schematic structural view of an actual usage state of a second embodiment of the present invention;

in the figure: 1. the pump comprises a pump cover, 2 pump shafts, 3 sealing gland, 4 first oil seals, 5 second oil seals, 6 sealing cavities, 7 mechanical seals, 8 pipelines, 9 oil cups, 10 baffle rings, 11 sealing rings, 12 threaded pins, 301 first plates, 301-1 threaded through holes, 302 second plates, 303 third plates and 304 first grooves.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments;

the utility model relates to a prevent dry grinding machine and seal structure has solved the technical problem that dry grinding can appear in the mechanical seal among the correlation technique, and the general thinking is as follows:

the first embodiment is as follows:

see fig. 1, 2; a sealing structure of a dry-proof mill comprises a pump cover 1 and a pump shaft 2 penetrating through the pump cover 1; further comprising:

the sealing gland 3 is penetrated on the pump shaft 2 and is connected with the pump cover 1;

the pump cover 1 is connected with the pump cover 2, and the pump cover 1 is tightly held with the pump cover 4 and used for separating the conveyed liquid;

the at least two second oil seals 5 are connected to the sealing gland 3 and used for forming a sealing cavity 6 with the sealing gland 3, the pump cover 1, the pump shaft 2 and the first oil seal 4;

a mechanical seal 7 connected to the pump shaft 2 and the gland 3 and disposed in the seal cavity 6;

two pipelines 8 connected to the gland 3 and communicated with the seal cavity 6;

the sealing ring 11 is arranged in the first groove 304 on the sealing gland 3 and is used for being attached to the pump cover 1;

specifically, when the method is implemented, cooling water is introduced from the pipeline 8 and enters the sealed cavity 6 to wash and cool the mechanical seal 7; because the sealing cavity 6 is a relatively sealed space formed by the sealing gland 3, the pump cover 1, the pump shaft 2, the first oil seal 4 and the second oil seal 5 and is isolated from the conveyed liquid, the conveyed liquid cannot be influenced, the mechanical seal 7 is ensured not to be subjected to dry grinding, and the sealing effect is good; therefore, the technical problem that the mechanical seal 7 is dry-ground is solved, and the technical effects of protecting the mechanical seal 7 and not influencing the liquid conveying are achieved;

specifically, in fig. 1 and 2, the gland 3 includes a first plate 301 connected to the pump cover 1, and two threaded through holes 301-1 for connecting the pipes 8 are formed in the side wall;

a second plate 302 connected to the first plate 301 for positioning with the pump cap 1 and for connecting the mechanical seal 7;

and a third plate 303 attached to the first plate 301 for connecting the second oil seal 5 together with the first plate 301;

in implementation, the first plate 301 is of a circular ring structure, is connected with the pump cover 1 through a bolt, and is provided with two threaded through holes 301-1 on the side wall for connecting the pipeline 8;

the second plate 302 is of a circular structure, is used for being in clearance fit with the pump cover 1 according to normal tolerance to form positioning, is convenient for installing the sealing gland 3, and is used for positioning a fixed ring on the mechanical seal 7;

the third plate 303 is of a circular structure, so that the second oil seal 5 can be conveniently installed;

the first plate 301, the second plate 302 and the third plate 303 are integrally cast or welded by steel plates and then machined;

specifically, in fig. 1 and 2, the number of the first oil seal 4 and the second oil seal 5 is two, and a common structure in the prior art is adopted to perform a sealing function;

specifically, in fig. 1 and 2, the mechanical seal 7 is a single-end mechanical seal, such as a 105-type single-end mechanical seal, a stationary ring is connected to the seal gland 3, and a moving ring is tightly embraced on the pump shaft 2, so as to form a seal structure, and ensure the sealing performance;

specifically, in fig. 1 and 2, the pipelines 8 are straight pipes, bent pipes are assembled and welded, the straight pipes and the bent pipes are connected with the threaded through holes 301-1 through threads, and when cooling water is introduced, hoses are connected to the two pipelines 8 through hoops to form circulating cooling water, so that the mechanical seal 7 can be well washed and cooled circularly;

specifically, in fig. 1 and 2, a retaining ring 10 is further included, which is positioned with the pump shaft 2 by at least two threaded pins 12, and is used for retaining the second oil seal 5; in implementation, the baffle ring 10 is machined through a steel plate, and after the baffle ring is connected to the pump shaft 2 through the threaded pin 12, a barrier is formed at the sealing gland 3, so that the second oil seal 5 can be prevented from falling off, and dust can be prevented from entering;

specifically, in fig. 1 and 2, the sealing ring 11 is an O-ring, which ensures the sealing property between the sealing gland 3 and the pump cover 1;

example two:

see fig. 3, 4; on the basis of the first embodiment, the oil cup 9 is additionally arranged on the pipeline 8 on one side, the pipeline 8 on the other side is sealed by the plug, circulating cooling water is not introduced, water consumption is reduced, after the oil cup 9 is installed, lubricating oil in the oil cup 9 enters the sealing cavity 6 through the pipeline 8, the mechanical seal 7 is lubricated, washed and cooled, and the effect of preventing the mechanical seal 7 from being dry-ground can be achieved; the oil cup 9 adopts a common structure in the prior art, for example, the Chinese patent application number is 201720290664.5, the subject name of the patent is the prior art of a needle valve type oil cup, and the oil cup is connected to the pipeline 8 through a connecting piece in a threaded manner, so that the lubricating oil is injected;

the utility model discloses a theory of operation: when the device is implemented, cooling water is introduced from the pipeline 8 and enters the sealed cavity 6 to wash and cool the mechanical seal 7; because the sealing cavity 6 is a relatively sealed space formed by the sealing gland 3, the pump cover 1, the pump shaft 2, the first oil seal 4 and the second oil seal 5 and is isolated from the conveyed liquid, the conveyed liquid cannot be influenced, the mechanical seal 7 is ensured not to be subjected to dry grinding, and the sealing effect is good; therefore, the technical problem that the mechanical seal 7 is dry-ground is solved, and the technical effects of protecting the mechanical seal 7 and not influencing liquid conveying are achieved.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like, which indicate orientations or positional relationships, are based on the positional relationships illustrated in the drawings, and are only for convenience of describing the present invention or simplifying the description, but do not indicate specific orientations that must be provided; the operation processes described in the embodiments are not absolute use steps, and may be adjusted accordingly when actually used.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs; the use of "first," "second," and the like in the description and in the claims is not intended to identify any order, quantity, or importance, but rather is used to distinguish one element from another, and similarly, the use of "a" or "an" and the like do not necessarily indicate a limitation of quantity, but rather indicate the presence of at least one, depending on the context of the embodiment.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (4)

1. A sealing structure of a dry-proof mill comprises a pump cover (1) and a pump shaft (2) penetrating through the pump cover (1); it is characterized by also comprising:

the sealing gland (3) is penetrated on the pump shaft (2) and is connected with the pump cover (1);

the pump cover (1) is connected with the pump cover (2), and the pump cover (1) is tightly held with the pump cover (4) and used for separating the conveyed liquid;

the at least two second oil seals (5) are connected to the sealing gland (3) and are used for forming a sealing cavity (6) with the sealing gland (3), the pump cover (1), the pump shaft (2) and the first oil seal (4);

a mechanical seal (7) connected to the pump shaft (2) and the gland (3) and disposed in the seal cavity (6);

two pipelines (8) connected to the gland (3) and communicating with the seal cavity (6);

and the sealing ring (11) is arranged in the first groove (304) on the sealing gland (3) and is used for being attached to the pump cover (1).

2. The seal structure of claim 1, wherein: the lubricating oil filling device also comprises an oil cup (9) which is connected to the pipeline (8) and is used for filling lubricating oil into the sealed cavity (6).

3. The seal structure of claim 1, wherein: the pump shaft sealing device further comprises a retaining ring (10) which is positioned with the pump shaft (2) through at least two threaded pins (12) and used for retaining the second oil seal (5).

4. The seal structure of claim 1, wherein: the sealing gland (3) comprises a first plate (301) connected to the pump cover (1), and the side wall of the sealing gland is provided with two threaded through holes (301-1) for connecting the pipeline (8);

a second plate (302) connected to the first plate (301) for positioning with the pump cover (1) and for connecting the mechanical seal (7);

and a third plate (303) connected to the first plate (301) for connecting the second oil seal (5) together with the first plate (301).

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