Main plunger sealing device of solid pump

Abstract

The utility model provides a main plunger sealing device of a solid pump, which is arranged between a plunger guide cylinder and a main plunger of the solid pump, is positioned at the front end of the plunger guide cylinder, and comprises an annular mounting seat, an annular scraper, a check ring, a combined seal, a copper sleeve and a gland which are sequentially arranged, a flange protruding inwards is arranged at the front end of the annular mounting seat; the gland is connected with the rear end of the annular mounting base, and the annular scraper, the check ring, the combined seal and the copper sleeve are fixed and pressed between the flange and the gland; the annular scraper is formed by splicing at least three arc-shaped sub-scrapers, and gaps are formed among the sub-scrapers; blades are arranged on the inner sides of the sub-scrapers, and grooves are formed in the outer sides of the sub-scrapers in the circumferential An annular elastic piece is integrally arranged in a groove of the annular scraper in a sleeved mode, so that the sub-scraper is shrunk inwards and pressed to the outer surface of the main plunger. The main plunger sealing device is good in sealing performance and not prone to material leakage; the scraper is more strongly attached to the outer surface of the main plunger, so that materials adhered to the outer surface of the main plunger can be better scraped; and the sealing device is not easy to corrode after long-term use.

Description

Technical Field

[0001] The utility model belongs to the technical field of solid waste treatment, and in particular relates to a main plunger sealing device for a solid pump. Background Art

[0002] The SMP system is an integrated system for waste crushing, mixing and pumping. It is an ideal feeding system for the rotary kiln incineration process, which can ensure the continuous and stable supply of quenched and heated materials to the rotary kiln. The solid pump is a new type of piston pump that can pump hazardous solid wastes such as solid distillation residues, woven bags, iron barrel skins, waste liquids, distillation residues, etc. It is one of the important components in the SMP system. The solid pump consists of a pump body, a feed port, a plunger guide cylinder, a main plunger, a plunger head, a material cylinder, a gate knife, a gate knife plunger rod, a gate knife cylinder, a gate cover, a main plunger sealing system, a gate knife sealing system and other structures. Among them, the main plunger sealing system is located at the front end of the plunger guide cylinder and between the plunger guide cylinder and the main plunger. The main sealing system is the core component of the solid pump. During operation, the main sealing system seals the plunger guide cylinder and the feed port to prevent materials from entering the plunger guide cylinder and corroding the cylinder. During long-term operation, the main sealing system needs to be in direct contact with hazardous waste, causing long-term corrosion. In addition, when the main plunger retreats, the main sealing system will scrape off the hazardous waste adhering to the main plunger and will not leak the material out.

[0003] The existing main sealing system of the solid pump has a weak fit with the outer surface of the main plunger and cannot effectively scrape off the adhered material; the sealing performance is poor and it is easy to leak material out; and it is in contact with hazardous waste for a long time, which can easily reduce the sealing performance due to corrosion. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a main plunger sealing device for a solid pump, which has good sealing performance and is not easy to leak; the scraper fits more closely with the outer surface of the main plunger and can better scrape off the material adhered to the outer surface of the main plunger; the sealing device is not easy to be corroded after long-term use.

[0005] In order to solve the above problems, the utility model provides a main plunger sealing device of a solid pump, which is arranged between the plunger guide cylinder and the main plunger of the solid pump and is located at the front end of the plunger guide cylinder, comprising an annular mounting seat, an annular scraper, a retaining ring, a combined seal, a copper sleeve and a pressure cover which are arranged in sequence from the front end to the rear end of the plunger guide cylinder; the annular mounting seat is suitable for connecting with the front end of the plunger guide cylinder; the front end of the annular mounting seat is provided with a flange protruding inwardly; the pressure cover is connected with the rear end of the annular mounting seat, so as to fix and press the annular scraper, the retaining ring, the combined seal and the copper sleeve between the flange and the pressure cover; the annular scraper is composed of at least 3 arc-shaped sub-scrapers, and gaps are provided between the sub-scrapers; a blade is provided on the inner side of the sub-scraper, and a groove is provided on the outer side of the sub-scraper along the circumferential direction; an annular elastic member is integrally sleeved in the groove of the annular scraper, so that the sub-scraper shrinks inwardly and is pressed onto the outer surface of the main plunger.

[0006] Preferably, the end surfaces at both ends of the sub-scraper in the circumferential direction are inclined surfaces, and the angle between the adjacent end surfaces of two adjacent sub-scrapers is 60°-120°.

[0007] Preferably, in the annular scraper, the arc lengths of the sub-scrapers are equal.

[0008] Preferably, the annular scraper is composed of three arc-shaped sub-scrapers; the arc of each sub-scraper is 120°.

[0009] Preferably, the arc length of the gap between the sub-scrapers is 0.5-1.5 mm.

[0010] Preferably, the annular scrapers are in two groups, and the two groups of annular scrapers are sequentially arranged between the flange and the retaining ring.

[0011] Preferably, the blade is arranged at the front end of the inner side of the sub-scraper, and the angle of the blade is 55°-65°.

[0012] Preferably, the combined seal comprises a first polytetrafluoroethylene sealing ring, a second polytetrafluoroethylene sealing ring and a plurality of groups of NBR rubber rings; the plurality of groups of NBR rubber rings are arranged between the first polytetrafluoroethylene sealing ring and the second polytetrafluoroethylene sealing ring.

[0013] Preferably, the copper sleeve is provided with a plurality of through oil ports spaced apart along the circumferential direction.

[0014] Preferably, a plurality of annular oil grooves are circumferentially provided on the inner peripheral side wall of the copper sleeve.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model discloses a main plunger sealing device for a solid pump. The annular scraper can scrape off the adhered material on the outer surface of the main plunger during the main plunger's telescopic movement. The retaining ring can press the scraper to avoid uneven contact between the scraper and the combined seal. The combined seal can ensure the sealing performance of the sealing device and prevent the material from leaking out. Through the cooperation of the annular mounting seat, the annular scraper, the retaining ring, the combined seal, the copper sleeve and the gland, the sealing structure has better sealing performance, is not easy to leak out, and can effectively scrape off the adhered material.

[0017] The utility model discloses a main plunger sealing device for a solid pump, wherein an annular scraper is composed of a plurality of arc-shaped sub-scrapers, a certain gap is left between the sub-scrapers, and after being installed on the outer surface of the main plunger, each scraper segment can be closely attached to the main plunger through the contraction effect of the annular elastic member on each scraper segment, so that the scraper can more effectively scrape off the adhered material on the outer surface of the main plunger. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a main plunger sealing device of a solid pump according to an embodiment of the utility model when it is installed to the outer surface of the main plunger;

[0019] Figure 2 yes Figure 1 A partial enlarged view of point a in the middle;

[0020] Figure 3 It is a structural schematic diagram of an annular scraper in a main plunger sealing device of a solid pump according to an embodiment of the utility model;

[0021] Figure 4 It is a front view of an annular scraper in a main plunger sealing device of a solid pump according to an embodiment of the utility model;

[0022] Figure 5 It is a cross-sectional view of the annular scraper at A in the main plunger sealing device of the solid pump according to the embodiment of the utility model;

[0023] Figure 6 It is a cross-sectional view of the annular scraper at position B in the main plunger sealing device of the solid pump according to the embodiment of the utility model;

[0024] Figure 7 It is a structural schematic diagram of a combined seal in a main plunger sealing device of a solid pump according to an embodiment of the utility model;

[0025] Figure 8 It is a cross-sectional view of a copper sleeve in a main plunger sealing device of a solid pump described in an embodiment of the utility model.

[0026] Among them: 1-annular mounting seat; 2-annular scraper; 3-retaining ring; 4-combined seal; 5-copper sleeve; 6-pressure cover; 7-plunger guide cylinder; 8-main plunger; 9-annular elastic member; 10-oil port; 11-flange; 12-oil groove; 21-sub-scraper; 22-blade; 23-groove; 41-first polytetrafluoroethylene sealing ring; 42-second polytetrafluoroethylene sealing ring; 43-NBR rubber ring. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0029] Example 1

[0030] like Figure 1 , Figure 2 , Figure 3 As shown, a main plunger sealing device of a solid pump described in this embodiment is arranged between the plunger guide cylinder 7 and the main plunger 8 of the solid pump and is located at the front end of the plunger guide cylinder, and includes an annular mounting seat 1, an annular scraper 2, a retaining ring 3, a combined seal 4, a copper sleeve 5 and a gland 6 which are arranged in sequence from the front end to the rear end of the plunger guide cylinder; the annular mounting seat 1 is suitable for connecting with the front end of the plunger guide cylinder 7; the front end of the annular mounting seat 1 is provided with a flange 11 protruding inwardly; the gland 6 and the annular mounting seat The rear end of the seat 1 is connected, so that the annular scraper 2, the retaining ring 3, the combined seal 4 and the copper sleeve 5 are fixed and pressed between the flange 11 and the pressure cover 6; the annular scraper 2 is composed of at least 3 arc-shaped sub-scrapers 21, and gaps are provided between the sub-scrapers 21; a blade 22 is provided on the inner side of the sub-scraper 21, and a groove 23 is provided on the outer side of the sub-scraper 21 along the circumferential direction; an annular elastic member 9 is integrally sleeved in the groove 23 of the annular scraper 2, so that the sub-scraper 21 shrinks inward and is pressed onto the outer surface of the main piston 8.

[0031] The main plunger sealing device of the solid pump of this embodiment has an annular mounting seat for mounting the sealing device as a whole on the front end of the plunger guide cylinder; the annular scraper scrapes off the adhered material on the outer surface of the main plunger when the main plunger reciprocates and telescopes; the function of the retaining ring is to press the scraper and also to avoid uneven contact force between the scraper and the combined seal; the combined seal is mainly used to ensure the sealing performance of the sealing device and prevent material leakage; the gland can press the annular scraper, the retaining ring, the combined seal and the copper sleeve to fix the above structure between the annular mounting seat and the gland. In the main plunger sealing device of the solid pump of the present embodiment, the annular scraper is composed of at least three segments of arc-shaped sub-scrapers, that is, a full-ring scraper is divided into at least three segments. If the scraper adopts a full-ring structure, the annular scraper is gap-fitted when fixed to the outer surface of the main plunger, and the two cannot be tightly attached, resulting in the scraper being unable to effectively scrape off the material adhering to the outer surface of the main plunger. By adopting the form of multiple segments of arc-shaped sub-scrapers, a certain gap is left between the sub-scrapers. After being installed on the outer surface of the main plunger, the annular elastic member shrinks each segment of the scraper so that each segment of the scraper can be close to the main plunger, and the scraper can more effectively scrape off the adhering material on the outer surface of the main plunger.

[0032] In some embodiments, the annular elastic member 9 may be any type of elastic member, as long as it can apply an inward contraction force to each segment of the scraper. Preferably, the annular elastic member 9 is a cylindrical annular tension spring.

[0033] In some embodiments, Figure 4 As shown, the end faces of both ends of the sub-scraper 21 in the circumferential direction are inclined surfaces, and the angle between the adjacent end faces of two adjacent sub-scrapers is 60°-120°. Thus, a certain space is left between the end faces of two adjacent sub-scrapers, which facilitates the contraction of the sub-scrapers by the annular elastic member.

[0034] In order to improve the uniformity of the contraction force of the annular elastic member on the sub-scrapers and to increase the force of the scrapers when scraping off adhered materials, preferably, in the annular scraper, the arc lengths of the sub-scrapers 21 are equal.

[0035] Taking into account the convenience of installation and operation of each sub-scraper of the annular scraper and the stability of the sub-scrapers after installation, it is further preferred that the annular scraper is composed of three arc-shaped sub-scrapers 21; the arc of each sub-scraper is 120°.

[0036] To facilitate the contraction effect of the annular elastic member on the sub-scrapers and avoid leakage of material in the gaps between the sub-scrapers, preferably, the arc length of the gaps between the sub-scrapers 21 is 0.5-1.5 mm, and more preferably, the arc length of the gaps between the sub-scrapers 21 is 1 mm.

[0037] In order to improve the scraping rate of the scraper for scraping off the adhered material, preferably, the annular scraper 2 is composed of two groups, and the two groups of annular scrapers are sequentially arranged between the flange 11 and the retaining ring 3.

[0038] The angle of the scraper blade not only affects the strength of the scraper, but also affects the scraping force of the scraper on the adhered material. The smaller the angle of the scraper blade, the worse the strength, and the larger the angle of the scraper blade, the worse the scraping force on the adhered material. Preferably, as Figure 5 , Figure 6 As shown, the blade is arranged at the front end of the inner side of the sub-scraper, and the angle of the blade is 55°-65°. With this angle, the ability of the scraper blade to scrape materials can be improved while ensuring the strength of the scraper blade. Further preferably, the angle of the blade is 60°.

[0039] Specifically, the retaining ring 3 can be a metal ring.

[0040] Preferably, if Figure 7 As shown, the combined seal 4 includes a first polytetrafluoroethylene seal ring 41, a second polytetrafluoroethylene seal ring 42 and multiple groups of NBR rubber rings 43; the multiple groups of NBR rubber rings 43 are arranged between the first polytetrafluoroethylene seal ring 41 and the second polytetrafluoroethylene seal ring 42. The NBR rubber ring is used to ensure the sealing performance, and since hazardous waste materials are usually corrosive, in order to prevent the NBR rubber ring from being corroded, a section of polytetrafluoroethylene seal ring is added at the front and rear ends thereof to ensure that the sealing device is not corroded by the material under long-term operation.

[0041] Preferably, if Figure 8 As shown, a plurality of through oil ports 10 are provided at intervals along the circumferential direction on the copper sleeve 5. Butter can be injected from the outside of the copper sleeve through the oil ports, and the butter flows between the sealing device and the main plunger to lubricate the movement of the main plunger.

[0042] Further preferably, a plurality of annular oil grooves 12 are provided along the circumferential direction on the inner peripheral side wall of the copper sleeve 5. The butter pumped from the outside of the copper sleeve enters the inner ring through the oil port 10, is distributed in the multiple oil grooves 12 of the inner ring, and can flow along the multiple annular oil grooves, thereby covering the entire circumference of the oil grooves and lubricating the outer surface of the main plunger 360°.

[0043] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A main plunger sealing device of a solid pump, arranged between the plunger guide cylinder and the main plunger of the solid pump and located at the front end of the plunger guide cylinder, characterized in that: It comprises an annular mounting seat, an annular scraper, a retaining ring, a combined seal, a copper sleeve and a pressure cover which are arranged in sequence from the front end to the rear end of the plunger guide cylinder; the annular mounting seat is suitable for being connected to the front end of the plunger guide cylinder; the front end of the annular mounting seat is provided with a flange protruding inward; the pressure cover is connected to the rear end of the annular mounting seat, so as to fix and press the annular scraper, the retaining ring, the combined seal and the copper sleeve between the flange and the pressure cover; the annular scraper is composed of at least 3 arc-shaped sub-scrapers, and gaps are provided between the sub-scrapers; a blade is provided on the inner side of the sub-scraper, and a groove is provided on the outer side of the sub-scraper along the circumferential direction; an annular elastic member is integrally sleeved in the groove of the annular scraper, so that the sub-scraper shrinks inwardly and is pressed onto the outer surface of the main plunger.

2. The main plunger sealing device of a solid pump according to claim 1, characterized in that: The end surfaces at both ends of the sub-scraper in the circumferential direction are inclined surfaces, and the angle between the adjacent end surfaces of two adjacent sub-scrapers is 60°-120°.

3. The main plunger sealing device of a solid pump according to claim 1, characterized in that: In the annular scraper, the arc lengths of the sub-scrapers are equal.

4. The main plunger sealing device of a solid pump according to claim 3, characterized in that: The annular scraper is composed of three arc-shaped sub-scrapers; the arc of each sub-scraper is 120°.

5. The main plunger sealing device of a solid pump according to claim 1, characterized in that: The arc length of the gap between the sub-scrapers is 0.5-1.5 mm.

6. The main plunger sealing device of a solid pump according to claim 1, characterized in that: The annular scrapers are divided into two groups, and the two groups of annular scrapers are sequentially arranged between the flange and the retaining ring.

7. The main plunger sealing device of a solid pump according to claim 1, characterized in that: The blade is arranged at the front end of the inner side of the sub-scraper, and the angle of the blade is 55°-65°.

8. The main plunger sealing device of a solid pump according to claim 1, characterized in that: The combined seal comprises a first polytetrafluoroethylene sealing ring, a second polytetrafluoroethylene sealing ring and a plurality of groups of NBR rubber rings; the plurality of groups of NBR rubber rings are arranged between the first polytetrafluoroethylene sealing ring and the second polytetrafluoroethylene sealing ring.

9. The main plunger sealing device of a solid pump according to claim 1, characterized in that: The copper sleeve is provided with a plurality of through oil ports spaced apart along the circumferential direction.

10. The main plunger sealing device of a solid pump according to claim 9, characterized in that: A plurality of annular oil grooves are arranged on the inner peripheral side wall of the copper sleeve along the circumferential direction.

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