Hydraulic support emulsion pump station sealing system

Abstract

The invention discloses a hydraulic support emulsion pump station sealing system which comprises a dustproof seal on the outer side and a main seal on the inner side. The dustproof seal is composed of a framework, rubber, a spring and non-woven fabric, a lip abutting against the sliding block is formed at the end of the rubber, the spring provides continuous radial pressing force for the lip, and the non-woven fabric is used for absorbing and releasing lubricating oil. The main seal is composed of an outer oil seal and an inner oil seal, the outer oil seal is provided with a framework, rubber, a spring and non-woven fabric, the inner oil seal is provided with a framework, rubber and non-woven fabric, the outer oil seal and the inner oil seal are assembled in an interference fit mode, and a limiting structure is arranged to guarantee positioning. The outer circle rubber is of a wave-shaped structure and is in interference fit with the groove to form static sealing, and annular lines are arranged on the inner side of the lip to store lubricating oil. Through spring tensioning, non-woven fabric lubrication, annular pattern oil storage and a double-framework composite sealing structure, the sealing service life is effectively prolonged, and the sealing reliability of the emulsion pump station under the working conditions of high-speed reciprocating and insufficient lubrication is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sealing, and particularly relates to a sealing system for an emulsion pump station of a hydraulic support. BACKGROUND

[0002] The hydraulic support is one of the most core support devices in a fully mechanized coal mining face, and mainly functions to support a roof and ensure the safety and stability of a coal mining face operation environment. The emulsion pump station is a power core of the hydraulic support, and its sealing performance is directly related to the reliability and service life of the hydraulic system. The emulsion pump station usually adopts a high-pressure plunger pump structure, and is internally composed of a gear transmission box, a pump head, a cooling system and the like. The crosshead slider of the gear transmission box part needs to pass through the box body and be connected with an external connecting rod, and a sealing element must be configured at the position to prevent oil leakage and external dust intrusion.

[0003] In the prior art, a common sealing scheme usually adopts a combination structure of a polyurethane Y-shaped ring and a Stellite seal. This kind of seal performs well in a low-speed and high-pressure environment, but has obvious defects in the working condition of the emulsion pump station, such as high-speed reciprocating motion (the speed is about 3.75 m / s) and insufficient oil splashing. First, the polyurethane material has poor compression permanent deformation performance, and the lip elasticity is insufficient after long-term work, so that the lip cannot closely follow the surface of the slider at high speed, and leakage is prone to occur. Second, the design principle of the Y-shaped ring is more suitable for a high-pressure and low-speed scene, and the response speed of the lip is insufficient under the condition of rapid reciprocation, which further aggravates the leakage risk. Third, the sealing performance of the Stellite seal will also decrease significantly under high-speed conditions, and even exceeds the designed use limit, resulting in frequent leakage.

[0004] Therefore, the sealing life of the existing emulsion pump station sealing system is about 3 months in new equipment, and after replacing the sealing element underground, it can only be maintained for half a month or even shorter. This condition not only increases the maintenance frequency and cost, but also seriously affects the continuity and safety of the fully mechanized coal mining face. In view of the above problems, how to design a sealing system with longer service life and more stable sealing effect under the condition of less medium oil and high-speed reciprocation has become an urgent technical problem to be solved. SUMMARY

[0005] To solve the above problems, the application provides a sealing system for an emulsion pump station of a hydraulic support, which can solve the problems of short sealing life and serious leakage, significantly prolong the service life of the sealing element, and improve the reliability and safety of the emulsion pump station.

[0006] The technical scheme provided by the application is as follows. A sealing system for an emulsion pump station of a hydraulic support, comprising a dustproof seal and a main seal. The dustproof seal is arranged on the outer side and comprises a first skeleton and a first rubber arranged on the inner side of the first skeleton. The first rubber has a first lip in abutment with the sliding block. The side of the first rubber away from the sliding block is provided with a spring groove. A first spring is arranged in the spring groove. The first spring provides radial compression force for the first lip. The main seal is arranged on the inner side and comprises an outer oil seal and an inner oil seal. The outer oil seal comprises a second skeleton and a second rubber arranged on the inner side of the second skeleton. The second rubber has a second lip in abutment with the sliding block. The side of the second rubber away from the sliding block is provided with a spring groove. A second spring is arranged in the spring groove. The second spring provides radial compression force for the second lip. The inner oil seal comprises a third skeleton and a third rubber arranged on the side of the third skeleton. The third skeleton is press-fitted on the inner side of the second skeleton.

[0007] In some embodiments, the first skeleton is provided with a fourth rubber on the outer side. A first non-woven fabric is bonded to the fourth rubber. The other side of the first non-woven fabric is in abutment with the sliding block.

[0008] In some embodiments, the outer side of the fourth rubber adopts a wave-shaped structure and is in interference fit with the mounting groove to form a static seal.

[0009] In some embodiments, the second skeleton is provided with a fifth rubber on the outer side. A second non-woven fabric is bonded to the fifth rubber. The other side of the second non-woven fabric is in abutment with the sliding block.

[0010] In some embodiments, the outer side of the fifth rubber adopts a wave-shaped structure and is in interference fit with the mounting groove to form a static seal.

[0011] In some embodiments, a third non-woven fabric is bonded to the third rubber. The other end of the third non-woven fabric is in abutment with the sliding block.

[0012] In some embodiments, the first lip is provided with an annular ridge on the side close to the first non-woven fabric.

[0013] In some embodiments, the number of annular ridges is 2-4. The depth radius of the annular ridges is 0.03-0.08 mm.

[0014] In some embodiments, the third skeleton is in interference fit with the second skeleton.

[0015] In some embodiments, the second skeleton comprises a second sealing portion and a second press-fitting portion. The second rubber is vulcanized and bonded to the end of the second sealing portion. The third skeleton comprises a third sealing portion and a third press-fitting portion. The third rubber is vulcanized and bonded to the end of the third sealing portion. The third press-fitting portion is press-fitted on the inner side of the second press-fitting portion to form interference fit. A limiting portion for limiting the third press-fitting portion is formed between the second sealing portion and the second press-fitting portion.

[0016] In summary, the beneficial effects of the present application are as follows: (1) The present application uses rubber lip instead of polyurethane material, which utilizes the good compression permanent deformation performance of rubber, and cooperates with the spring to continuously provide radial holding force. The lip can maintain good adhesion during high-speed reciprocation, avoiding early oil leakage due to material failure, and greatly improving the service life.

[0017] (2) The present application bonds a non-woven fabric layer on the inside of the sealing rubber, and designs an annular texture structure on the inside of the dust-proof seal lip. The non-woven fabric can absorb and store gear oil or lubricating oil, and continuously release during operation to provide lubrication between the slider and the lip; the annular texture can store lubricating oil to form an oil film return channel, reducing dry friction wear, thereby further prolonging the sealing life.

[0018] (3) The present application adopts a double skeleton structure for the outer oil seal and the inner oil seal, which is firmly and stably assembled through interference fit and limiting parts, avoiding loosening due to assembly deviation or vibration after long-term operation. The interference fit of the outer circular wave-shaped structure and the installation groove forms a static seal to prevent oil leakage.

[0019] (4) The present application has triple sealing protection of dust-proof seal, outer oil seal and inner oil seal, which can not only block dust and impurities, but also maintain sealing performance under insufficient lubrication, suitable for harsh environments such as high dust, high vibration and high-speed reciprocation in coal mine, ensuring long-term stable operation of the emulsion pump station. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the assembly structure of the present application; Figure 2 is a schematic diagram of the dust-proof seal structure of the present application; Figure 3 is a schematic diagram of the main sealing structure of the present application; Figure 4 is Figure 2 is an enlarged view of A in the middle; Figure 5 is a schematic diagram of the press-fitting structure of the second skeleton and the third skeleton of the present application.

[0021] The reference signs are as follows: 1, dust-proof seal; 2, main seal; 3, gear box; 4, crosshead slider; 101, first skeleton; 102, first rubber; 103, first lip; 104, first spring; 105, fourth rubber; 106, first non-woven fabric; 107, annular texture; 201, second frame; 202, second rubber; 203, second lip; 204, second spring; 205, third frame; 206, third rubber; 207, fifth rubber; 208, second non-woven fabric; 209, third non-woven fabric; 2011, second sealing part; 2012, second press-fitting part; 2013, limiting part; 2051, third sealing part; 2052, third press-fitting part. DETAILED DESCRIPTION

[0022] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0023] Example 1 like Figures 1-5 As shown, this embodiment provides a hydraulic support emulsion pump station sealing system, which includes an outer dust seal 1 and an inner main seal 2.

[0024] The structure of the emulsion pump is a high-pressure plunger pump. The high-pressure plunger pump mainly consists of three parts: a gearbox, a pump head, and an oil cooling circulation system. The gearbox is composed of an integral casting housing, an input shaft, a crankshaft, a connecting rod, a crosshead slider 4, and an oil pump. The crosshead slider extends out of the gearbox 3, and there is a seal at this position. Please refer to Figure 1 Two annular receiving grooves are opened on the gear transmission housing. The dust seal 1 of this application is arranged in the outer receiving groove and is sleeved on the surface of the crosshead slider 4. The main seal 2 is arranged in the inner receiving groove and is sleeved on the surface of the crosshead slider 4 to form two seals.

[0025] The dust seal 1 is composed of a first skeleton 101 and a first rubber 102. The first skeleton 101 is a metal ring, which is made by stamping or turning processes and has good strength and rigidity to ensure that it does not deform during assembly and long-term operation. The first rubber 102 is made of oil-resistant and wear-resistant rubber material and is firmly bonded to the first skeleton 101 through a vulcanization process. A first lip 103 is extended from the end of the first rubber 102 to abut against the slider. In order to maintain stable contact between the first lip 103 and the surface of the slider, an annular groove is provided on the side of the first rubber 102 away from the slider, and a first spring 104 is installed in the groove. The spring is made of spring steel wire with a circular cross-section. After installation, it provides continuous radial pressing force to the lip to ensure that it can still adhere to the surface when the slider reciprocates at high speed, thereby achieving dustproof and primary sealing functions.

[0026] The main seal 2 comprises an outer oil seal and an inner oil seal. The outer oil seal is composed of a second skeleton 201 and a second rubber 202, the second rubber 202 also adopts an oil-resistant and wear-resistant formula and is bonded to the inner side end of the second skeleton 201 through mold vulcanization. The end of the second rubber 202 forms a second lip 203, which directly abuts against the surface of the sliding block and is provided with a spring groove in the back, and the second spring 204 is installed in the groove to ensure that the second lip 203 is in close contact with the sliding block and plays a main sealing role.

[0027] The inner oil seal is composed of a third skeleton 205 and a third rubber 206. The third skeleton 205 is precisely stamped and formed, and the size is matched with the second skeleton 201. When installed, the third skeleton 205 is pressed into the inner side of the second skeleton 201 and forms an interference fit. The interference fit ensures that the inner oil seal will not loosen under high-frequency vibration working conditions. The third rubber 206 is bonded to the end of the third skeleton 205 and abuts against the surface of the sliding block, forming a second sealing barrier and achieving a three-level sealing effect.

[0028] In this embodiment, the dust seal 1 mainly plays a role in blocking dust and impurities, and the main seal 2 bears the main function of sealing oil. The system has a simple and reliable structure and can significantly improve the sealing life under the working conditions of the conventional coal mine fully mechanized working face emulsion pump station.

[0029] Embodiment 2 This embodiment is formed on the basis of embodiment 1, further improves the structure of the sealing element, and adds a non-woven fabric layer and a wave-shaped structure to improve wear resistance and static sealing performance. Specifically: In the dust seal 1, the outer side of the first skeleton 101 is covered with a section of the fourth rubber 105. The inner surface of the fourth rubber 105 is bonded to the first non-woven fabric 106, and the other end of the first non-woven fabric 106 directly contacts the sliding block. The non-woven fabric layer has good oil absorption and wear resistance. In this embodiment, a certain amount of lubricating oil is absorbed before the system is running, and the lubricating oil is gradually released during the reciprocating motion of the sliding block, lubricating the contact surface of the sliding block and the lip, reducing dry friction, and thereby prolonging the service life of the dust seal.

[0030] The outer circular surface of the fourth rubber 105 adopts a wave-shaped structure. This structure is in interference fit with the mounting groove of the pump body during assembly, can form a stable static seal in the radial direction, and avoids seal failure caused by oil penetration or vibration after installation.

[0031] In the main seal 2, the outer side of the second skeleton 201 of the outer oil seal is covered with a section of the fifth rubber 207, and the inner surface of the fifth rubber 207 is bonded with the second non-woven fabric 208, and the other end of the second non-woven fabric 208 is directly in contact with the sliding block. Similar to the effect of the non-woven fabric layer of the dust-proof seal, the second non-woven fabric 208 can not only absorb excess gear oil, but also form a lubricating oil film on the surface of the sliding block, thereby reducing the wear of the rubber lip.

[0032] In addition, the surface of the third rubber 206 is bonded with the third non-woven fabric 209, and the third non-woven fabric 209 is directly in contact with the sliding block, which can not only block the penetration of gear oil, but also absorb the gear oil splashed and form a lubricating film, thereby providing a more stable lubricating environment between the inner oil seal and the outer oil seal.

[0033] Through this improvement, the sealing system not only realizes the elastic sealing force provided by "rubber + spring", but also enhances the lubrication and assembly stability through "non-woven fabric + wave-shaped structure", thereby further prolonging the service life of the seal. The structure is particularly suitable for complex working conditions with high dust and frequent sliding block movement in coal mines.

[0034] Embodiment 3 This embodiment is further optimized on the basis of the previous two embodiments, mainly improving the sealing reliability in the detail design.

[0035] In the dust-proof seal 1, the first lip 103 of the first rubber 102 is processed with an annular groove 107 near one side of the first non-woven fabric 106. The annular groove 107 can store the lubricating liquid released by the first non-woven fabric 106 during the reciprocating motion of the sliding block, forming a micro oil reservoir. In this way, even if the external lubrication is insufficient during high-speed reciprocation of the sliding block, the oil in the annular groove can still maintain the lubricating environment at the lip, avoiding dry friction and improving the service life of the dust-proof seal.

[0036] Specifically, the number of annular grooves 107 is 2-4, preferably 2. The multiple annular grooves are coaxially distributed on the outer side surface of the first lip 103, and each annular groove forms a small liquid storage groove with the surface of the sliding block. When the sliding block reciprocates, the annular groove 107 can adsorb and retain a small amount of gear oil, forming an oil film, so that the lubricating environment between the lip and the sliding block can still be maintained under the condition of high-speed motion of the sliding block and insufficient lubrication.

[0037] Further, the depth radius of the annular groove 107 is 0.03-0.08mm. By controlling the depth of the annular groove, a balance between oil storage capacity and sealing performance can be achieved. If the depth is too shallow, the oil storage effect will be insufficient; if the depth is too deep, the structural strength of the rubber lip may be weakened. Through tests, a depth range of 0.03-0.08mm can not only ensure sufficient oil storage, but also will not affect the adhesion and service life of the lip.

[0038] In this embodiment, the cooperation of the annular grooves and the non-woven fabric 106 is remarkable: the non-woven fabric 106 can absorb gear oil in advance when the system is stationary or at low speed and release it at start-up, and the annular grooves 107 play a role in oil storage and backflow during movement, so that the dust-proof seal has good lubrication effect under long-term operation. This structure is particularly suitable for the working condition of the emulsion pump station slider high-speed reciprocation and limited lubricating oil volume, further prolonging the service life of the sealing system and improving the reliability.

[0039] A limiting structure is arranged between the outer oil seal and the inner oil seal of the main seal 2. The second skeleton 201 includes a second sealing part 2011 and a second press-fitting part 2012, and the second rubber 202 is vulcanized at the end of the second sealing part 2011. The third skeleton 205 includes a third sealing part 2051 and a third press-fitting part 2052, and the third rubber 206 is vulcanized at the end of the third sealing part 2051. During assembly, the third press-fitting part 2052 is pressed into the inner side of the second press-fitting part 2012, and the two form an interference fit. In order to prevent excessive pressing or position deviation during assembly, a limiting part 2013 is designed between the second sealing part 2011 and the second press-fitting part 2012 to position and limit the third press-fitting part 2052, ensuring assembly accuracy and sealing effect.

[0040] Through the design of the limiting structure, the assembly reliability of the main seal is significantly improved, avoiding the failure problem caused by improper assembly during long-term operation. This scheme is particularly suitable for high-frequency start-stop and fast reciprocation conditions.

[0041] When the sealing system of this scheme is running in the hydraulic support emulsion pump station, the slider reciprocates at a speed of about 3.75 m / s. Due to the limited amount of oil in the pump station cavity, the traditional polyurethane Y-shaped ring and the stator seal are prone to failure under this working condition, with insufficient service life.

[0042] In this scheme, the dust-proof seal 1 bears the function of blocking dust and external particulate matter, and at the same time provides lubrication for the lip through the design of non-woven fabric oil storage and annular groove oil return. The outer oil seal of the main seal 2 realizes the first hydraulic seal through the second lip 203 and the second spring 204, and the inner oil seal acts as a second barrier to form a composite sealing effect with the outer oil seal. The spring continuously provides the lip with a holding force to prevent failure due to permanent deformation of the material compression. The interference fit of the wavy structure and the installation groove forms a static seal to prevent loosening caused by vibration and impact.

[0043] Therefore, the sealing system of this scheme can solve the problems of short sealing life and serious leakage, significantly prolong the service life of the sealing element, and improve the reliability and safety of the emulsion pump station.

[0044] It is to be understood that the implementations to be described are merely exemplary and that only so much as is necessary for the pertinent understanding of the application should be considered for purposes of patentsability. Furthermore, no limitation of the scope of the claims is intended by the reference to certain specific structures, shapes or methods for carrying out the application as described below.

[0045] It is also to be understood that the terminology used herein is for the purpose of describing particular implementations only and is not intended to be limiting, unless otherwise indicated. It will be understood that the use of terminology such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", and the like is in reference to the implementations as shown in the drawings and is not intended to be limiting.

[0046] The foregoing description illustrates and describes implementations of the present application only. As is readily appreciated by those skilled in the art for whom this application is intended, alternatives and / or modifications of the various details and aspects can be made to the disclosed embodiments without departing from the spirit and scope of the application, and the scope of protection is only limited by the claims that follow. Those skilled in the art will readily appreciate that other applications can be anticipated that are consistent with the spirit and scope of the present application as defined by the following claims.

Claims

1. A hydraulic support emulsion pump station sealing system, characterized in that: It includes a dust seal (1) and a main seal (2); The dust seal (1) is arranged on the outside, and includes a first skeleton (101), and a first rubber (102) arranged on the inside of the first skeleton (101), the first rubber (102) having a first lip (103) abutting against the slider, a spring groove is provided on the side of the first rubber (102) away from the slider, a first spring (104) is provided in the spring groove, and the first spring (104) provides radial pressing force for the first lip (103); The main seal (2) is arranged on the inner side and includes an outer oil seal and an inner oil seal; The outer oil seal comprises a second skeleton (201) and a second rubber (202) arranged on the inner side of the second skeleton (201), the second rubber (202) having a second lip (203) abutting against the slider, a spring groove being provided on a side of the second rubber (202) away from the slider, a second spring (204) being provided in the spring groove, and the second spring (204) providing radial pressing force for the second lip (203); The inner oil seal comprises a third skeleton (205) and a third rubber (206) arranged on a side of the third skeleton (205); The third frame (205) is press-fitted inside the second frame (201).

2. The hydraulic support emulsion pump station sealing system according to claim 1 is characterized in that: A fourth rubber (105) is provided on the outside of the first skeleton (101), a first non-woven fabric (106) is bonded to the fourth rubber (105), and the other side of the first non-woven fabric (106) is in contact with the slider.

3. The hydraulic support emulsion pump station sealing system according to claim 2 is characterized in that: The outer side of the fourth rubber (105) adopts a wavy structure and forms a static seal by interference fit with the installation groove.

4. The hydraulic support emulsion pump station sealing system according to claim 1 is characterized in that: A fifth rubber (207) is provided on the outer side of the second skeleton (201), a second non-woven fabric (208) is bonded to the fifth rubber (207), and the other side of the second non-woven fabric (208) is in contact with the slider.

5. The hydraulic support emulsion pump station sealing system according to claim 4 is characterized in that: The outer side of the fifth rubber (207) adopts a wavy structure and forms a static seal by interference fit with the installation groove.

6. The hydraulic support emulsion pump station sealing system according to claim 4, characterized in that: A third non-woven fabric (209) is bonded to the third rubber (206), and the other end of the third non-woven fabric (209) is in contact with the slider.

7. The hydraulic support emulsion pump station sealing system according to claim 2, characterized in that: A side of the first lip (103) close to the first non-woven fabric (106) is provided with an annular pattern (107).

8. The hydraulic support emulsion pump station sealing system according to claim 7, characterized in that: The number of the annular lines (107) is 2-4, and the depth radius of the annular lines (107) is 0.03-0.08 mm.

9. The hydraulic support emulsion pump station sealing system according to claim 1, characterized in that: The third skeleton (205) and the second skeleton (201) are interference fit.

10. The hydraulic support emulsion pump station sealing system according to claim 9, characterized in that: The second skeleton (201) includes a second sealing portion (2011) and a second press-fitting portion (2012), the second rubber (202) is vulcanized and bonded to the end of the second sealing portion (2011), the third skeleton (205) includes a third sealing portion (2051) and a third press-fitting portion (2052), the third rubber (206) is vulcanized and bonded to the end of the third sealing portion (2051); The third press-fitting portion (2052) is press-fitted inside the second press-fitting portion (2012) to form an interference fit, and a limiting portion (2013) for limiting the third press-fitting portion (2052) is formed between the second sealing portion (2011) and the second press-fitting portion (2012).

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