High-pressure fluid rotary distribution device
By adopting a combined structure of floating sealing blocks and fixed sealing blocks in the rotary joint, combined with the design of three groups of angular contact ball bearings and locking nuts, the problem of vibration of bearing components and leakage at the sealing end of the rotary joint under high pressure and high speed is solved. , achieving stable operation and low-cost production.
Patent Information
- Application Number
- CN202411543726.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-01-07
AI Technical Summary
The existing rotary joints are prone to vibration and shaking of bearing components under high-pressure fluid and high-speed rotation, resulting in unstable rotation shaft and concentricity offset, which in turn causes liquid leakage at the sealing end and bearing wear, and the purchase cost is high and maintenance cost is high.
A high-pressure fluid rotation distribution device is designed, using a combined structure of floating sealing block and fixed sealing block, ensuring sealing through guide flow path and threaded connection, and using three sets of angular contact ball bearings and locking nuts for bearing limits, reducing the Part cost and machining complexity.
It realizes stable operation of bearing components under high pressure and high speed conditions, avoids liquid leakage at the sealing end, extends service life, and reduces production and maintenance costs.
Smart Images
Figure CN119267674A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of rotary joints, and in particular to a high-pressure fluid rotary distribution device. Background Art
[0002] A rotary joint is a connecting and sealing device that inputs fluid media from a static system to a dynamic rotating system. It can be used to transmit various media such as gas, liquid, oil, etc. The application fields of rotary joints almost cover all processing and manufacturing industries, such as: metallurgy, machine tools, power generation, petroleum, rubber, plastics, textiles, printing and dyeing, pharmaceuticals, cigarettes, papermaking, food, feed processing, etc. When conveying high-pressure oil, water, and air, a rotary joint is set between relatively rotating equipment to ensure that the two ends of the rotary joint can still convey fluid when rotating relative to each other.
[0003] At present, there are many types of rotary joints on the market, and their internal structures vary greatly according to different usage scenarios and requirements. Our company currently uses a rotary joint that is directly purchased and is mainly used on high-pressure cleaning machines. When in use, the rotary joint is connected to the main shaft of the cleaning machine to transport high-pressure water to the water outlet for cleaning the processed parts to ensure the cleanliness requirements of the parts. However, after use, it was found that the existing rotary joints have the following technical problems: the bearing assembly in the rotary joint is prone to vibration and shaking under the action of high-pressure fluid and high-speed rotation. On the one hand, the vibration of the bearing assembly will cause the rotating shaft to move unsteadily, and then the concentricity of the rotating shaft will be offset, resulting in leakage at the sealing end; on the other hand, the vibration of the bearing assembly during use will accelerate the wear and damage of the bearing, resulting in the product being not durable, and the wear and offset of the bearing will further aggravate the offset of the rotating shaft, thus creating a vicious cycle; and the purchase cost of the rotary joint is extremely high, and the price of the finished product is 9,000-20,000 yuan / piece according to different models. Once the internal parts of the rotary joint are damaged, the entire joint will be scrapped, which greatly increases the cost of the enterprise.
[0004] Based on this, our company launched a transformation project for rotary joints and designed a high-pressure fluid rotary distribution device with simple structure, stability and reliability, long service life and low maintenance cost. The production cost of the distribution device was reduced to 1-1.5 thousand per piece, which greatly saved the company's production costs. Summary of the invention
[0005] The present invention aims to provide a high-pressure fluid rotary distribution device to solve the technical problem that the bearing assembly of the existing rotary joint is prone to vibration and shaking during use, causing the rotating shaft to shift, thereby causing leakage at the sealing end and a short service life of the bearing assembly.
[0006] In order to achieve the above object, the present invention adopts the following technical scheme:
[0007] A high-pressure fluid rotary distribution device comprises a shell and a hollow rotating shaft, the rotating shaft is rotatably connected to the shell through a bearing assembly, the shell comprises a detachably connected water inlet block and a bearing seat, the water inlet block is provided with a water inlet and a water inlet channel, a floating sealing block is also provided in the water inlet channel, the floating sealing block is provided with a through guide channel, the guide channel is communicated with the water inlet channel, a fixed sealing block for rotationally cooperating with the floating sealing block is provided on the top of the rotating shaft, the guide channel on the floating sealing block is communicated with the inner cavity of the rotating shaft, and the axes of the two are concentric; a positioning shoulder is provided at one end of the rotating shaft close to the fixed sealing block, a threaded portion is provided at one end of the rotating shaft away from the fixed sealing block, a locking nut is threadedly connected to the threaded portion, the outer ring of the bearing assembly is fixed to the bearing seat, the inner ring of the bearing assembly is fixed to the rotating shaft, the upper end of the bearing assembly is limited by the positioning shoulder, and the lower end of the bearing assembly is limited by the locking nut.
[0008] Invention concept:
[0009] Before designing the structure of the present application, the inventors had tried to divide the shell into three sections, in which the bearings were installed on the second and third sections of the shell. However, the bearings of this structure would still vibrate after long-term use, which would cause the concentricity of the rotating shaft to shift. In addition, the multi-section structure was more complicated to install, used many parts, was not easy to maintain, had high production costs, and had poor performance. After many research and development tests, a structure with a simple structure, good performance, good sealing, no vibration of the bearings during the design life, and smooth operation of the rotating shaft was finally designed.
[0010] Beneficial effects:
[0011] 1. A floating sealing block is arranged on the water inlet channel of the water inlet block, and a guide channel is arranged on the floating sealing block. The guide channel on the floating sealing block guides the high-pressure fluid in the water inlet channel, so that the high-pressure fluid entering from the water inlet of the water inlet block passes through the water inlet channel and the guide channel and then enters the inner cavity of the rotating shaft; by arranging the floating sealing block, under the impact of the high-pressure fluid, the floating sealing block can be made to float axially, and then be pressed against the fixed sealing block on the rotating shaft, which is beneficial to improve the sealing between the floating sealing block and the fixed sealing block, avoid leakage at the sealing end, and increase the service life of the rotary joint.
[0012] 2. By fixing the fixed sealing block on the rotating shaft, when the rotating shaft rotates, the fixed sealing block rotates relative to the floating sealing block. Compared with setting the fixed sealing block as a floating structure, in the present application, the rotating sealing block is fixedly connected, and the floating sealing block that does not rotate in the water inlet channel is set as a floating structure, which is conducive to better achieving dynamic balance, thereby ensuring the smooth operation of the sealing end and the rotating shaft, and is conducive to improving the sealing performance and service life of the two sealing blocks.
[0013] 3. By providing a positioning shoulder at the upper end of the rotating shaft, the upper end face of the bearing assembly can be axially limited, and by providing a locking nut at the lower end of the rotating shaft, the lower end face of the bearing assembly can be completely locked and limited by rotating the locking nut, which solves the problem that when the bearing assembly is axially limited by a retaining ring, the retaining ring has a processing error, which makes it impossible to completely lock and limit the bearing assembly, and there is still a movable gap in the axial direction of the bearing assembly. In this way, under high pressure and high speed conditions, the bearing assembly will vibrate or shake due to unreliable fixation. The shaking of the bearing will accelerate the wear of the bearing itself on the one hand, and cause the rotating shaft to deviate on the other hand. Once the concentricity of the rotating shaft is offset, a gap will be generated between the fixed sealing block and the floating sealing block, which will lead to reduced sealing and water leakage. In addition, when a gap is generated between the fixed sealing block and the floating sealing block, the contact surfaces of the two are subjected to inconsistent forces, which will accelerate the damage of the sealing block. The present application processes threads on the rotating shaft and provides a locking nut. The bottom of the bearing assembly can be completely locked by rotating the locking nut, thereby ensuring stable and reliable operation of the rotating shaft, which is beneficial to increasing the service life of the bearing assembly and the entire rotary joint.
[0014] 4. The rotary joint designed in the present application has a simple internal structure, is easy to assemble, and has low purchase costs for each part. Therefore, the parts cost and processing cost of the entire rotary joint total 1,000-1,500 yuan / piece, which greatly saves the company's production costs compared to the previous purchase of a rotary joint at a cost of 9,000-20,000 yuan / piece. In addition, the shell of the rotary joint of the present application includes a detachably connected water inlet block and a bearing, and the internal structure is relatively simple. Therefore, when a part is worn, it can be replaced, which is beneficial to reduce the company's maintenance costs.
[0015] Preferably, as an improvement, the bearing assembly includes three groups of angular contact ball bearings, and the three groups of angular contact ball bearings adopt a DBD combination method. The end of the angular contact ball bearing close to the locating shoulder of the rotating shaft is limited by the locating shoulder, and the angular contact ball bearing located at the lower end of the rotating shaft is axially limited by a locking nut.
[0016] Beneficial effects: By setting up three groups of angular contact ball bearings and arranging and assembling them in the DBD combination mode, the bearing assembly can withstand both radial loads and axial loads in two directions, which is beneficial to increasing the service life of the bearing; and the angular contact ball bearing at the bottom is axially limited by a locking nut, which can effectively prevent the bearing from axial displacement, improve the stability of the bearing, and thus ensure the stability and concentricity of the rotating shaft, improve the sealing performance of the sealing end, and reduce water leakage problems.
[0017] Preferably, as an improvement, the cross-section of the floating sealing block is a T-shaped structure, the vertical end of the T-shaped structure is a sealing portion, and the lateral end of the T-shaped structure is a mounting portion. The bottom of the water inlet block is also provided with a mounting cavity connected to the water inlet channel. The sealing portion of the floating sealing block extends into the water inlet channel to close the water inlet channel and guide the high-pressure fluid in the water inlet channel. After the sealing portion extends into the water inlet channel, the axis of the guiding channel is concentric with the axis of the water inlet channel. The mounting portion of the floating sealing block can be floatingly disposed on the inner wall of the mounting cavity through an installation assembly.
[0018] Beneficial effect: By extending one end of the floating seal block into the water inlet channel, the impact force of the high-pressure fluid in the water inlet channel can be fully utilized to make the floating seal block move axially, and the greater the pressure of the high-pressure fluid, the tighter the floating seal block moves axially and presses against the fixed seal block, thereby making the rotational sealing effect of the rotating shaft better.
[0019] Preferably, as an improvement, the mounting assembly includes a limit pin and an elastic member, the limit pin passes through the mounting portion of the floating sealing block and is fixed on the water inlet block, the limit pin is used to limit the rotation of the floating sealing block, the mounting portion of the floating sealing block is evenly provided with a plurality of spring grooves in the circumferential direction, the elastic member is arranged in the spring groove, and the free end of the elastic member extends out of the spring groove to abut against the end of the water inlet block.
[0020] Beneficial effects: The floating sealing block is limited circumferentially by the limit pin to prevent the floating sealing block from rotating under the rotation of the fixed sealing block, which is beneficial to improving the dynamic balance of the sealing end; an elastic member is provided on the mounting portion of the floating sealing block, and the free end of the elastic member is abutted against the water inlet block. When no high-pressure fluid passes through, the elastic member is used to ensure that the floating sealing block and the end face of the fixed sealing block are abutted. When high-pressure fluid passes through, the high-pressure fluid and the elastic member jointly apply axial force to the floating sealing block, thereby improving the sealing performance of the sealing end from multiple aspects.
[0021] Preferably, as an improvement, a mounting hole is further provided on the mounting portion of the floating sealing block, the axis of the mounting hole is concentric with the axis of the guide flow channel, and the inner diameter of the mounting hole is larger than the inner diameter of the guide flow channel, and a first alloy sealing ring is fixedly provided in the mounting hole, and the inner diameter of the first alloy sealing ring is larger than the inner diameter of the guide flow channel.
[0022] Beneficial effects:
[0023] 1. Existing sealing rings mostly use ceramic rings, which are hard and wear-resistant, but they are also more brittle and easily affected by the vibration of the bearing assembly. Once the ceramic ring is broken or damaged, the entire rotary joint will be scrapped. Because the processing of ceramic ring parts is more complicated, it is difficult to purchase matching ceramic ring parts for replacement. Therefore, the present application uses high-hardness, wear-resistant cemented carbide materials as sealing rings, which are more durable than ceramic rings, and when damaged, they are also easy to process and prepare new parts for replacement, and the maintenance cost is lower.
[0024] 2. After the first alloy sealing ring is installed in the mounting hole, its inner diameter is larger than the inner diameter of the guide channel, so that when the high-pressure fluid enters the sealing part, it can play a certain buffering and pressure-relieving role, thereby reducing the impact of the high-pressure fluid on the sealing part, which is beneficial to ensure the sealing effect and reduce water leakage problems.
[0025] Preferably, as an improvement, a sealing ring is further provided on the outer diameter of the sealing portion of the floating sealing block.
[0026] Beneficial effect: by providing a sealing ring on the outer diameter of the sealing part, the sealing performance between the floating sealing block and the water inlet channel can be further enhanced, thereby preventing water leakage between the floating sealing block and the water inlet channel wall during the floating process.
[0027] Preferably, as an improvement, a mounting hole is also provided at the end of the rotating shaft close to the floating sealing block, and the fixed sealing block is fixedly arranged in the mounting hole, the fixed sealing block is a second alloy sealing ring, the end face of the second alloy sealing ring is abutted against the end face of the first alloy sealing ring, and the second alloy sealing ring is dynamically sealed with the first alloy sealing ring, the axes of the first alloy sealing ring and the second alloy sealing ring are concentric with the inner cavity axis of the rotating shaft, and the inner diameter of the inner cavity of the rotating shaft is consistent with the inner diameter of the guide flow channel.
[0028] Preferably, as an improvement, the bearing seat and the water inlet block are connected by bolts, and a shoulder is also provided on the end surface of the water inlet block that contacts the bearing seat, the shoulder is located on the inner side of the water inlet block, and the bottom of the shoulder is against the outer end surface of the bearing assembly; a limiting boss is provided on the inner diameter of the bearing seat, and a spacer is provided on the limiting boss, and the spacer is used to axially limit the outer end surface of the bearing assembly in the bearing seat.
[0029] Beneficial effects: A shoulder is arranged on the water inlet block, which can not only limit the position of the bearing seat, but also axially limit the outer end face of the bearing assembly in the bearing seat, while the inner end face of the bearing assembly is limited by the positioning shoulder on the rotating shaft; a limiting boss and a spacer are arranged in the bearing seat to limit the outer side of the lower end face of the bearing assembly, while the inner side of the lower end face of the bearing assembly is limited by the locking nut on the rotating shaft, thereby achieving comprehensive and stable limiting of the bearing assembly under high flow rate and high speed conditions, preventing the bearing from shaking or vibrating and affecting the stability of the rotating shaft.
[0030] Preferably, as an improvement, a first skeleton oil seal is provided between the upper end of the rotating shaft and the water inlet block, and a second skeleton oil seal is provided between the lower end of the rotating shaft and the bearing seat.
[0031] Beneficial effects: In the present application, the water inlet block and the bearing seat are fixed shells, and the rotating shaft is fixed by arranging the first skeleton oil seal and the second skeleton oil seal, which is beneficial to further ensure the stable operation of the rotating shaft and avoid the concentricity deviation of the rotating shaft; in addition, the first skeleton oil seal and the second skeleton oil seal can also play a protective role for the bearing assembly. Specifically, the first skeleton oil seal is arranged on the water inlet block, which can seal and isolate the bearing assembly at the lower end to avoid water entering the bearing assembly after the floating sealing block and the fixed sealing block leak, causing the bearing assembly to rust.
[0032] Preferably, as an improvement, a drain port is further provided on the water inlet block, and the drain port is communicated with the installation cavity of the water inlet block.
[0033] Beneficial effect: When the floating sealing block and the fixed sealing block are damaged and leaking, water will be retained in the installation cavity due to the sealing effect of the first skeleton oil seal. By setting a drain port on the water inlet block, the water retained in the installation cavity can be discharged through the drain port. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] Figure 1 It is a structural schematic diagram of the rotary distribution device of the present invention;
[0035] Figure 2 It is a structural schematic diagram of the water inlet block of the present invention;
[0036] Figure 3 It is a structural schematic diagram of the floating sealing block of the present invention;
[0037] Figure 4 for Figure 3 A cross-sectional view of
[0038] Figure 5 for Figure 3 Bottom view of
[0039] Figure 6 is a three-dimensional diagram of the rotary distribution device (the water inlet block is omitted in the figure);
[0040] Figure 7 for Figure 1 A magnified schematic diagram of point A1 in the figure. DETAILED DESCRIPTION
[0041] The following is further described in detail through specific implementation methods:
[0042] The figure marks in the drawings of the specification include: housing 1, water inlet block 11, water inlet channel 111, water inlet 112, installation cavity 113, drain outlet 114, shoulder 115, bearing seat 12, limiting boss 121, spacer 122, bolt hole 123, bolt 1231, rotating shaft 2, positioning shoulder 21, air release groove 211, locking nut 22, floating sealing block 3, guide channel 30, sealing portion 31, slot 311, installation portion 32, installation hole 321, welding hole 3211, pin hole 322, limiting pin 3221, spring slot 323, spring 3231, first alloy sealing ring 41, second alloy sealing ring 42, angular contact ball bearing 5, first skeleton oil seal 61, second skeleton oil seal 62.
[0043] In this embodiment, the high-pressure fluid rotary distribution device is mainly used in high-pressure cleaning machines, wherein the pressure of the high-pressure fluid is 0-70MPa, the flow rate of the high-pressure fluid is 229L / min, and the speed of the cleaning machine spindle is 500r / min; it is worth noting that the high-pressure fluid rotary distribution device designed in the present application is not limited to use in high-pressure cleaning machines, but can also be used as a rotary joint in other high-pressure, large-flow, and high-speed scenarios, and it has been verified through use that the performance of the rotary distribution device is stable and reliable, and the service life is long, the service life is 15,000 hours, and the failure rate during the service life is 0; and the production cost is low, 1-1,500 yuan per piece, compared with the original purchase of rotary joints of 9,000-20,000 yuan per piece, the company uses 48 sets per year, and can save 399,100 yuan in costs each year.
[0044] like Figure 1-2 As shown, the high-pressure fluid rotary distribution device comprises a housing 1 and a hollow rotary shaft 2, the rotary shaft 2 being rotatably connected to the housing 1 via a bearing assembly; the housing 1 is a two-stage structure, the housing 1 comprises a detachably connected water inlet block 11 and a bearing seat 12, the water inlet block 11 is provided with a water inlet 112 and a water inlet channel 111, the water inlet channel 111 is further provided with a floating sealing block 3, the floating sealing block 3 is provided with a through guide channel 30, the guide channel 30 is communicated with the water inlet channel 111, a fixed sealing block for rotatably cooperating with the floating sealing block 3 is provided at the top of the rotary shaft 2, the guide channel 30 on the floating sealing block 3 is connected to the water inlet channel 111, The flow channel 30 is connected to the inner cavity of the rotating shaft 2, and the axes of the two are concentric; a positioning shoulder 21 is provided at one end of the rotating shaft 2 close to the fixed sealing block, and a threaded portion is provided at one end of the rotating shaft 2 away from the fixed sealing block, and a locking nut 22 is threadedly connected to the threaded portion. The outer ring of the bearing assembly is fixed to the bearing seat 12, and the inner ring of the bearing assembly is fixed to the rotating shaft 2, and the upper end of the bearing assembly is limited by the positioning shoulder 21, and the lower end of the bearing assembly is limited by the locking nut 22; in this embodiment, there is a gap between the locking nut 22 and the bearing seat 12 to avoid relative movement of the locking nut 22 and the rotating shaft 2 during use.
[0045] Specifically, the bearing assembly includes three groups of angular contact ball bearings 5, and the three groups of angular contact ball bearings 5 adopt a DBD combination method. The end of the angular contact ball bearing 5 close to the positioning shoulder 21 of the rotating shaft 2 is limited by the positioning shoulder 21, and the angular contact ball bearing 5 located at the lower end of the rotating shaft 2 is axially limited by a locking nut 22; the bearing assembly of this embodiment can enable it to withstand radial loads and axial loads in two directions, which is beneficial to improving the service life of the bearing; and the angular contact ball bearing 5 located at the lower end adopts a locking nut 22 for axial limitation, which can effectively prevent the bearing assembly from shifting axially, improve the stability of the bearing assembly, and thus ensure the stability and concentricity of the rotating shaft 2, improve the sealing performance of the sealing end, and reduce water leakage problems.
[0046] like Figure 3-5 As shown, the cross section of the floating sealing block 3 is a T-shaped structure, the vertical end of the T-shaped structure is a blocking portion 31, and the lateral end of the T-shaped structure is a mounting portion 32. Figure 1 As shown, a mounting cavity 113 connected to the water inlet channel 111 is further provided at the bottom of the water inlet block 11, and the sealing portion 31 of the floating sealing block 3 extends into the water inlet channel 111 to close the water inlet channel 111 and guide the high-pressure fluid in the water inlet channel 111. After the sealing portion 31 extends into the water inlet channel 111, the axis of the guide channel 30 is concentric with the axis of the water inlet channel 111. In addition, in order to further enhance the sealing between the sealing portion 31 and the water inlet channel 111, a groove 311 is further provided on the outer diameter of the sealing portion 31, and a sealing ring is provided in the groove 311 during installation.
[0047] The mounting portion 32 of the floating sealing block 3 can be floatingly arranged on the inner wall of the mounting cavity 113 through the mounting assembly; Figure 6 As shown, the installation assembly includes a limit pin 3221 and an elastic member. In this embodiment, there are two groups of limit pins 3221. Pin holes 322 are symmetrically arranged on the installation portion 32. When installed, one end of the two groups of limit pins 3221 extends into the pin hole 322, and the other end is arranged on the water inlet block 11 and can slide up and down in the water inlet block 11. The limit pin 3221 is used to limit the circumferential rotation of the floating sealing block 3. Figure 3 , 6 As shown, the mounting portion 32 of the floating sealing block 3 is evenly provided with a plurality of spring grooves 323 in the circumferential direction, the elastic member is arranged in the spring groove 323, and the free end of the elastic member extends out of the spring groove 323 to abut against the end of the water inlet block 11; specifically, the elastic member in this embodiment adopts a spring 3231, and the spring grooves 323 are six groups, and a spring 3231 is fixed in each group of spring grooves 323; and in this embodiment, the diameter of the mounting portion 32 is larger than the diameter of the top of the rotating shaft 2, which is conducive to the arrangement of the spring 323 to ensure that it abuts more tightly against the top of the rotating shaft 2, and is conducive to improving the sealing performance.
[0048] like Figure 4-5 As shown, the mounting portion 32 of the floating seal block 3 is further provided with a mounting hole 321, the axis of the mounting hole 321 is concentric with the axis of the guide channel 30, and the inner diameter of the mounting hole 321 is larger than the inner diameter of the guide channel 30, and a first alloy sealing ring 41 is fixedly provided in the mounting hole 321, and the inner diameter of the first alloy sealing ring 41 is larger than the inner diameter of the guide channel 30. Figure 1 As shown, a mounting hole 321 is also provided at the end of the rotating shaft 2 close to the floating sealing block 3, and the fixed sealing block is fixedly arranged in the mounting hole 321. Specifically, the fixed sealing block is a second alloy sealing ring 42, the end face of the second alloy sealing ring 42 is abutted against the end face of the first alloy sealing ring 41, and the second alloy sealing ring 42 is dynamically sealedly connected to the first alloy sealing ring 41, the axes of the first alloy sealing ring 41 and the second alloy sealing ring 42 are concentric with the inner cavity axis of the rotating shaft 2, and the inner diameter of the inner cavity of the rotating shaft 2 is consistent with the inner diameter of the guide flow channel 30.
[0049] Specifically, in this embodiment, the first alloy sealing ring 41 and the second alloy sealing ring 42 have the same size, the floating sealing block 3 and the mounting hole 321 provided on the rotating shaft 2 have the same size, and the first alloy sealing ring 41 and the second alloy sealing ring 42 are both fixed in the mounting hole 321 by brazing. Figure 5 As shown, four groups of welding holes 3211 are arranged on the circumference of the mounting hole 321, and welding fixation is achieved by filling copper material into the welding holes 3211, wherein the depth of the mounting hole 321 is 4 mm, the height of the first alloy sealing ring 41 and the second alloy sealing ring 42 is 5 mm, the distance that the first alloy sealing ring 41 and the second alloy sealing ring 42 extend out of the mounting hole 321 is 1 mm, and the first alloy sealing ring 41 and the second alloy sealing ring 42 are made of hard alloy material with high hardness and wear resistance.
[0050] like Figure 1 , 6 As shown, the bearing seat 12 and the water inlet block 11 are connected by bolts 1231. Specifically, a plurality of bolt holes 123 are evenly arranged on the bearing seat 12 and the water inlet block 11. The bolts 1231 pass through the bolt holes 123 on the bearing seat 12 and are fixedly connected to the water inlet block 11. Figure 1-2 As shown, a stop shoulder 115 is also provided on the end surface of the water inlet block 11 that contacts the bearing seat 12. The stop shoulder 115 is located on the inner side of the water inlet block 11, and the bottom of the stop shoulder 115 abuts against the outer end surface of the angular contact ball bearing 5. The stop shoulder 115 can be provided to limit and position the bearing seat 12, and can also axially limit the outer end surface of the angular contact ball bearing 5 in the bearing seat 12, while the inner end surface of the angular contact ball bearing 5 is limited by the positioning shoulder 21 on the rotating shaft 2. Figure 7As shown, in order to further ensure the limiting effect of the locating shoulder 21 and the angular contact ball bearing 5 in this embodiment, a degassing groove 211 is provided at the corner of the locating shoulder 21. The degassing groove 211 can avoid the problem of inaccurate machining at the corner of the locating shoulder 21 due to machining errors, thereby affecting the flatness of the contact with the end face of the angular contact ball bearing 5.
[0051] like Figure 1 As shown, a limiting boss 121 is provided on the inner diameter of the bearing seat 12, and a spacer ring 122 is provided on the limiting boss, and the spacer ring 122 is used to axially limit the outer end face of the angular contact ball bearing 5 in the bearing seat 12; the limiting boss 121 and the spacer ring 122 are provided in the bearing seat 12 to limit the outer side of the lower end face of the angular contact ball bearing 5, and the inner side of the lower end face of the angular contact ball bearing 5 is limited by the locking nut 22 on the rotating shaft 2, thereby realizing comprehensive and stable limiting of the bearing assembly under high flow rate and high speed conditions, preventing the bearing from shaking or vibrating during use, thereby affecting the stability of the rotating shaft 2.
[0052] More preferably, a first skeleton oil seal 61 is provided between the upper end of the rotating shaft 2 and the water inlet block 11, and a second skeleton oil seal 62 is provided between the lower end of the rotating shaft 2 and the bearing seat 12; since the water inlet block 11 and the bearing seat 12 are fixed shells 1, the rotating shaft 2 is fixed by providing the first skeleton oil seal 61 and the second skeleton oil seal 62, which is beneficial to further ensure the stable operation of the rotating shaft 2 and avoid the concentricity of the rotating shaft 2 from being offset; in addition, the first skeleton oil seal 61 and the second skeleton oil seal 62 can also protect the bearing assembly. Specifically, the first skeleton oil seal 61 is provided on the water inlet block 11, which can seal and isolate the bearing assembly at the lower end, so as to avoid the problem of water entering the bearing assembly after water leakage occurs in the sealing part of the floating sealing block 3 and the fixed sealing block, causing the bearing assembly to rust.
[0053] like Figure 2 As shown, a drain port 114 is also provided on the water inlet block 11, and the drain port 114 is connected to the installation cavity 113 of the water inlet block 11. When the floating sealing block 3 and the fixed sealing block are damaged and water leakage occurs, due to the sealing effect of the first skeleton oil seal 61, water will be retained in the installation cavity 113. By providing the drain port 114 on the water inlet block 11, the water retained in the installation cavity 113 can be discharged through the drain port 114.
[0054] When in use, the water inlet 112 on the water inlet block 11 is connected to the delivery pipeline of the high-pressure pump, and the free end of the rotating shaft 2 is connected to the main shaft of the cleaning machine. The main shaft rotates to drive the rotating shaft 2 to rotate, thereby realizing the delivery of the high-pressure fluid; specifically, when the high-pressure water enters the water inlet channel 111, the guide channel 30 on the floating sealing block 3 guides the high-pressure fluid in the water inlet channel 111, so that the high-pressure fluid entering from the water inlet 112 of the water inlet block 11 passes through the water inlet channel 111 and the guide channel 30 and then enters the rotating shaft 2 in the inner cavity; wherein, under the impact of the high-pressure fluid, the floating sealing block 3 floats axially, and then presses against the fixed sealing block on the rotating shaft 2, which is beneficial to improve the sealing between the floating sealing block 3 and the fixed sealing block, avoid leakage at the sealing end, and increase the service life of the rotary joint; in addition, when the rotating shaft 2 rotates, the locking nut 22 can completely lock and limit the lower end face of the bearing assembly, so that under high pressure and high speed conditions, the bearing assembly will not vibrate or shake, ensuring the smooth operation of the rotating shaft 2.
[0055] The high-pressure fluid rotary distribution device of the present application has a simple structure, is stable and reliable, has a long service life, and has a low maintenance cost. It solves the technical problem that the bearing assembly of the existing rotary joint is prone to vibration and shaking when in use, causing the rotating shaft to shift, which in turn causes leakage at the sealing end and a short service life of the bearing assembly.
[0056] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. A high-pressure fluid rotary distribution device, comprising a housing and a hollow rotary shaft, wherein the rotary shaft is rotatably connected to the housing through a bearing assembly, and characterized in that: The shell includes a detachably connected water inlet block and a bearing seat, the water inlet block is provided with a water inlet and a water inlet channel, a floating sealing block is also provided in the water inlet channel, the floating sealing block is provided with a through guide channel, the guide channel is communicated with the water inlet channel, a fixed sealing block for rotating with the floating sealing block is provided on the top of the rotating shaft, the guide channel on the floating sealing block is communicated with the inner cavity of the rotating shaft, and the axes of the two are concentric; a positioning shoulder is provided at one end of the rotating shaft close to the fixed sealing block, a threaded portion is provided at one end of the rotating shaft away from the fixed sealing block, a locking nut is threadedly connected to the threaded portion, the outer ring of the bearing assembly is fixed to the bearing seat, the inner ring of the bearing assembly is fixed to the rotating shaft, the upper end of the bearing assembly is limited by the positioning shoulder, and the lower end of the bearing assembly is limited by the locking nut.
2. The high pressure fluid rotary distribution device according to claim 1, characterized in that: The bearing assembly includes three groups of angular contact ball bearings, which are combined in a DBD manner. The ends of the angular contact ball bearings close to the locating shoulders of the rotating shaft are limited by the locating shoulders, and the angular contact ball bearings at the lower end of the rotating shaft are axially limited by a locking nut.
3. The high pressure fluid rotary distribution device according to claim 2, characterized in that: The cross-section of the floating sealing block is a T-shaped structure, the vertical end of the T-shaped structure is a sealing part, and the lateral end of the T-shaped structure is a mounting part. The bottom of the water inlet block is also provided with a mounting cavity connected to the water inlet channel. The sealing part of the floating sealing block extends into the water inlet channel to close the water inlet channel and guide the high-pressure fluid in the water inlet channel. After the sealing part extends into the water inlet channel, the axis of the guiding channel is concentric with the axis of the water inlet channel. The mounting part of the floating sealing block can be floatingly arranged on the inner wall of the mounting cavity through an installation component.
4. The high pressure fluid rotary distribution device according to claim 3, characterized in that: The installation assembly includes a limit pin and an elastic member. The limit pin passes through the installation part of the floating sealing block and is fixed on the water inlet block. The limit pin is used to limit the rotation of the floating sealing block. The installation part of the floating sealing block is evenly provided with a plurality of spring grooves in the circumferential direction. The elastic member is arranged in the spring groove, and the free end of the elastic member extends out of the spring groove and abuts against the end of the water inlet block.
5. The high pressure fluid rotary distribution device according to claim 4, characterized in that: A mounting hole is also provided on the mounting portion of the floating sealing block, the axis of the mounting hole is concentric with the axis of the guide flow channel, and the inner diameter of the mounting hole is larger than the inner diameter of the guide flow channel. A first alloy sealing ring is fixedly provided in the mounting hole, and the inner diameter of the first alloy sealing ring is larger than the inner diameter of the guide flow channel.
6. The high pressure fluid rotary distribution device according to claim 5, characterized in that: A sealing ring is also arranged on the outer diameter of the sealing portion of the floating sealing block.
7. The high pressure fluid rotary distribution device according to claim 6, characterized in that: The end of the rotating shaft close to the floating sealing block is also provided with a mounting hole, and the fixed sealing block is fixedly arranged in the mounting hole. The fixed sealing block is a second alloy sealing ring, the end face of the second alloy sealing ring is abutted against the end face of the first alloy sealing ring, and the second alloy sealing ring is dynamically sealed and connected to the first alloy sealing ring, the axes of the first alloy sealing ring and the second alloy sealing ring are concentric with the inner cavity axis of the rotating shaft, and the inner diameter of the inner cavity of the rotating shaft is consistent with the inner diameter of the guide flow channel.
8. The high pressure fluid rotary distribution device according to any one of claims 1 to 7, characterized in that: The bearing seat and the water inlet block are connected by bolts. A shoulder is also provided on the end surface of the water inlet block that contacts the bearing seat. The shoulder is located on the inner side of the water inlet block, and the bottom of the shoulder is against the outer end surface of the bearing assembly. A limiting boss is provided on the inner diameter of the bearing seat, and a spacer is provided on the limiting boss. The spacer is used to axially limit the outer end surface of the bearing assembly in the bearing seat.
9. The high pressure fluid rotary distribution device according to claim 8, characterized in that: A first skeleton oil seal is arranged between the upper end of the rotating shaft and the water inlet block, and a second skeleton oil seal is arranged between the lower end of the rotating shaft and the bearing seat.
10. The high pressure fluid rotary distribution device according to claim 9, characterized in that: The water inlet block is also provided with a drain port which is communicated with the installation cavity of the water inlet block.