Vinyl chloride compressor

Abstract

The present invention relates to a vinyl chloride compressor. It solves the defects such as unreasonable design in the prior art. The vinyl chloride compressor includes a compressor main body, and a number of working units with their gas paths connected in series are provided on the compressor main body. The number of working units are driven to do work by the same driving mechanism. A seal is provided at the rotational connection between the impeller rotating shaft of each working unit and the compressor main body. And an isobaric cavity is formed between each working unit and the compressor main body at one end of the seal close to the compressor main body. The air pressure in the isobaric cavity is equal to the partial vinyl chloride air pressure leaked from the working unit. When the working unit is doing work, the leaked vinyl chloride and a part of the gas in the isobaric cavity enter the seal from both ends of the seal respectively, and the leaked vinyl chloride and the gas entering the seal form a convection state. The advantages of this application are as follows: The formed convection state can stop the leakage of the leaked vinyl chloride in the seal.

Description

Technical Field

[0001] The present invention belongs to the technical field of vinyl chloride transportation, and particularly relates to a vinyl chloride compressor. Background Art

[0002] Vinyl chloride is mainly used to manufacture homopolymers and copolymers of polyvinyl chloride. It can also be copolymerized with vinyl acetate, butadiene, etc., and used as a comonomer for various polymers. It is an important raw material in the plastics industry and can also be used as a refrigerant, etc. It can also be used as an extractant for dyes and spices.

[0003] In the industrial production process, a compressor is used to do work on vinyl chloride during its transmission. When doing work, the axial seal of the rotating shaft of the impeller is a difficult point. For example, Chinese Patent No. CN202123251715.9 discloses a vinyl chloride centrifugal turbine compressor, which includes a motor, a high-speed shaft, a first-stage compression cylinder, and a second-stage compression cylinder communicated with the first-stage compression cylinder. The first-stage compression cylinder is provided with a first-stage inlet and a first-stage outlet, and the second-stage compression cylinder is provided with a second-stage inlet and a second-stage outlet. Inside the first-stage compression cylinder and the second-stage compression cylinder, a first-stage impeller and a second-stage impeller are respectively provided at the first-stage inlet and the second-stage inlet. The first-stage impeller and the second-stage impeller are fixed to both ends of the high-speed shaft. Vinyl chloride gas is sequentially subjected to first-stage pressurization by the first-stage impeller and second-stage pressurization by the second-stage impeller; the compressor is also provided with a gas seal cavity for preventing vinyl chloride gas from leaking, and the gas seal cavity is located at the non-end part of the high-speed shaft. This solution realizes the beneficial effects of high rotational speed, high air pressure, and low energy consumption by performing secondary centrifugal pressurization on vinyl chloride gas through the first-stage impeller and the second-stage impeller; at the same time, a gas seal cavity is provided to keep the vinyl chloride gas sealed during pressurization, avoiding the problem of vinyl chloride gas containing oil.

[0004] In the above solution, annular gas seal cavities are provided inside both the first-stage compression cylinder and the second-stage compression cylinder, and the gas seal cavities are used to prevent vinyl chloride gas from leaking through the gap. Although this method can solve the leakage problem to a certain extent, this solution belongs to a passive sealing form, using the already sealed gas seal cavity to form a barrier to the leaked vinyl chloride. Since the comb teeth and the sealing teeth in the gas seal cavity are in a relatively rotating relationship, wear is inevitable. Therefore, it is difficult to block the leakage of vinyl chloride when the sealing performance decreases and the pressure is gradually increased. Summary of the Invention

[0005] The object of the present invention is to solve the above problems and provide a vinyl chloride compressor that can solve the above technical problems.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] This vinyl chloride compressor includes a compressor main body, on which several work units with a sequentially connected gas path are provided. Several of the work units are all impeller-type rotary work units and are driven to do work by the same driving mechanism. A seal is provided at the rotary connection between the impeller rotation shaft of each work unit and the compressor main body. And an isobaric cavity is formed at one end of each work unit and the compressor main body close to the compressor main body where the seal is located. The air pressure in the isobaric cavity is equal to the partial vinyl chloride air pressure leaked from the work unit. When the work unit is doing work, the leaked vinyl chloride and part of the gas in the isobaric cavity enter the seal from both ends of the seal respectively, and the leaked vinyl chloride and the gas entering the seal form a convection state. At least part of the isobaric cavity and one end of the seal close to the compressor main body are vertically distributed; according to the pressurization process of the work unit, the volume of the isobaric cavity gradually increases.

[0008] In the above-mentioned vinyl chloride compressor, a pressure sensor is provided in the isobaric cavity. The isobaric cavity is communicated with an air pressure regulating system, and the pressure sensor and the air pressure regulating system are respectively connected to a controller.

[0009] In the above-mentioned vinyl chloride compressor, there are three work units, and each work unit respectively includes a volute and an impeller located in the volute. Two of the impellers are connected to a first impeller rotation shaft, and the remaining one impeller is connected to a second impeller rotation shaft. The side of the volute and the compressor main body are connected by an annular seal. The seals are respectively sleeved on the first impeller rotation shaft and the second impeller rotation shaft. One end of the seal far from the compressor main body is fixed to the annular seal, and the annular seal and the side of the compressor main body form the above-mentioned isobaric cavity.

[0010] In the above-mentioned vinyl chloride compressor, the seal sleeved on the first impeller rotation shaft is rotationally and sealingly connected to the first impeller rotation shaft; the seal sleeved on the second impeller rotation shaft is rotationally and sealingly connected to the second impeller rotation shaft.

[0011] In the above-mentioned vinyl chloride compressor, a positioning step is provided at one end of the annular seal far from the compressor main body, and an annular shoulder is provided at one end of the seal far from the compressor main body. The annular shoulder is fixed to the positioning step.

[0012] In the above-mentioned vinyl chloride compressor, the seal is any one of a carbon ring seal and a composite material seal.

[0013] In the above-mentioned vinyl chloride compressor, there are three work units, which are defined as the first work unit, the second work unit, and the third work unit. The air pressure after the first work unit performs work is less than the air pressure after the second work unit performs work, and the air pressure after the second work unit performs work is less than the air pressure after the third work unit performs work.

[0014] In the above-mentioned vinyl chloride compressor, the first impeller rotating shaft and the second impeller rotating shaft are respectively rotationally connected to the compressor main body. Oil sealing rings sleeved on the first impeller rotating shaft and the second impeller rotating shaft are provided on the side of the compressor main body, and the oil sealing rings and the corresponding sealers are distributed at intervals.

[0015] In the above-mentioned vinyl chloride compressor, the driving mechanism includes a speed increasing box provided on the compressor main body. A driving shaft is rotationally connected in the speed increasing box. The first impeller rotating shaft and the second impeller rotating shaft are parallel to each other and the driving shaft is located between the first impeller rotating shaft and the second impeller rotating shaft. The driving shaft and the first impeller rotating shaft are connected through a first gear transmission structure, and the driving shaft and the second impeller rotating shaft are connected through a second gear transmission structure.

[0016] In the above-mentioned vinyl chloride compressor, according to the pressurization process of the three work units, the volumes of the three isobaric cavities gradually increase.

[0017] In the above-mentioned vinyl chloride compressor, an oil cooling circulation system connected to the speed increasing box is provided on the compressor main body.

[0018] Compared with the existing technology, the advantages of this application are as follows:

[0019] The formed convection state can stop the leakage of vinyl chloride in the sealer. And when the sealing performance of the sealer deteriorates, due to the equal air pressure setting, the leakage of vinyl chloride can still be avoided, which can achieve the purpose of long-term use, avoid the phenomenon of frequent replacement of the sealer, ensure the safety of vinyl chloride transportation and work, and at the same time reduce the maintenance cost and maintenance difficulty of the compressor.

[0020] The compressor oil station forms a circulating oil supply for the lubricating oil in the speed increasing box through oil cooling to extend the service life of the speed increasing box. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic top view structure diagram of the vinyl chloride compressor provided by the present invention.

[0022] Figure 2 It is a schematic cross-sectional view structure diagram of the vinyl chloride compressor provided by the present invention.

[0023] Figure 3 It is a schematic top view structure diagram of the compressor main body provided by the present invention.

[0024] Figure 4 is Figure 2 The enlarged structure diagram at position F in

[0025] Figure 5 It is a control block diagram provided by the present invention.

[0026] Figure 6 It is a schematic structure diagram of the second embodiment provided by the present invention.

[0027] Figure 7 It is a schematic side view structure diagram of the vinyl chloride compressor provided by the present invention.

[0028] Figure 8 It is a schematic partial top view structure diagram of the vinyl chloride compressor provided by the present invention.

[0029] Figure 9 It is a schematic structure diagram of the oil mist treatment device provided by the present invention.

[0030] In the figure, there are compressor main body 1, inlet 10, outlet 11, working unit 2, volute 20, impeller 21, first impeller rotating shaft 22, second impeller rotating shaft 23, annular seal 24, positioning step 25, annular shoulder 26, blocking ring 27, micro gap 28, driving mechanism 3, speed increaser 30, driving shaft 31, first gear transmission structure 32, second gear transmission structure 33, seal 4, air pressure regulating system 5, controller 6, oil seal ring 7, sealing lip 70, isobaric cavity K, pressure sensor K1, first working unit 2A, second working unit 2B, third working unit 2C, oil cooling circulation system 8, oil pressure station 80, oil cooler 81, return oil pipe 82, oil outlet pipe 83, oil pump 84, main oil pipe 85, fine filter 86, oil mist treatment device 87, docking part 870, conical cavity 8700, annular baffle 8701, turbulent flow area 8702, oil receiving tray 871, outer cover 872, inner separation cavity 8720, outer separation cavity 8721, mesh cover 873, vertical annular mesh cylinder 8730, with recessed part 8731, recessed sub - part 8732, first filter screen 874, second filter screen 875, reflux bypass pipe 876, air duct 88. Detailed implementation manners

[0031] The following are specific embodiments of the invention and in combination with the attached drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0032] Embodiment 1

[0033] Such as Figures 1 - 3As shown in the figure, this vinyl chloride compressor includes a compressor main body 1. The vinyl chloride compressor has an inlet 10 and an outlet 11. The vinyl chloride that needs to do work enters from the inlet 10, and the vinyl chloride after doing work is discharged from the outlet 11. A number of work units 2 with a gas path connected in series are provided on the compressor main body 1. The number of work units 2 is 2 - 4, and all of them are impeller - type rotary work units and are driven to do work by the same drive mechanism 3.

[0034] A seal 4 is provided at the rotational connection between the impeller rotation shaft of each work unit 2 and the compressor main body 1. And an isobaric cavity K is formed between each work unit 2 and the compressor main body 1 at one end of the seal 4 close to the compressor main body 1. The seal 4 can be any one of a carbon ring seal and a composite material seal. The composite material is, for example, graphite - filled polytetrafluoroethylene. This material has self - lubricity and stability. When there is scratching between the rotation shaft and this seal, because graphite - filled polytetrafluoroethylene is softer than the material of the shaft and has self - lubricity, it can protect the shaft from damage when in contact. At the same time, the sealing teeth on the shaft can have slight contact with this material, and the clearance can be controlled very small, ensuring the sealing performance. For example, an inert gas with pressure is injected into the isobaric cavity K. The air pressure in the isobaric cavity K is equal to the air pressure of the vinyl chloride leaked from the work unit 2. When the work unit 2 is doing work, part of the leaked vinyl chloride and part of the gas in the isobaric cavity K enter the seal 4 from both ends of the seal 4, and the leaked vinyl chloride and the gas entering the seal 4 form a convection state. The formed convection state can make the leaked vinyl chloride stop leaking in the seal 4. And when the sealing performance of the seal 4 decreases, due to the equal air pressure setting in this embodiment, vinyl chloride leakage can still be avoided, which can achieve the purpose of long - term use, avoid the phenomenon of frequent seal replacement, ensure the safety of vinyl chloride transportation and work, and at the same time reduce the maintenance cost and maintenance difficulty of the compressor.

[0035] And in this way of the embodiment, the impeller does not need to be manufactured in a closed manner, which can further reduce the manufacturing cost and save the sealing cost at the impeller.

[0036] Secondly, at least part of the cavity of the isobaric cavity K and one end of the seal 4 close to the compressor main body 1 are vertically distributed. Due to the vertical state of at least part of the cavity, at least part of the cavity of the isobaric cavity K can form a cut - off for the leaked vinyl chloride to prevent the leaked vinyl chloride from continuing to leak along the axial direction of the impeller rotation shaft.

[0037] In addition, according to the pressurization process of several working units 2, the volumes of several isobaric cavities K gradually increase. After the working unit 2 does work on vinyl chloride, the pressure of the vinyl chloride at this time is continuously pressurized. The further designed isobaric cavity K with a gradually increasing volume can enable the gradually pressurized vinyl chloride to have a gradually increasing accommodation volume in the corresponding isobaric cavity K to counter the vinyl chloride with the corresponding pressure, ensuring that the sealing performance of the seal 4 remains consistent and extending its service life.

[0038] To achieve pressure control, as Figure 5 shown, a pressure sensor K1 is provided in the isobaric cavity K. The isobaric cavity K is connected to the air pressure regulation system 5, and the pressure sensor K1 and the air pressure regulation system 5 are respectively connected to the controller 6. The pressure sensor K1 detects the air pressure in the isobaric cavity K. When the air pressure of the leaked vinyl chloride is higher than the air pressure in the isobaric cavity K, the pressure in the isobaric cavity K will increase at this time. After receiving this signal, the controller 6 activates the air pressure regulation system 5 to input gas equal to the air pressure of the leaked vinyl chloride into the isobaric cavity K to form an equal balance pressure. A discharge valve is provided for each isobaric cavity K. When the vinyl chloride stops entering the compressor, the discharge valve opens at this time, and the gas in the isobaric cavity K and the leaked vinyl chloride gas are discharged and collected from the discharge valve to prevent the gas in the isobaric cavity K from entering the working unit 2.

[0039] In a preferred embodiment, a vinyl chloride detection sensor is provided at one end of the seal 4 close to the impeller, and an inert gas detection sensor is provided at one end of the seal 4 close to the compressor body 1 to detect whether the leaked vinyl chloride gas and the gas in the isobaric cavity K are in an isobaric state. The vinyl chloride detection sensor and the inert gas detection sensor are respectively connected to the controller 6. In this embodiment, they are connected by wireless communication.

[0040] The air pressure regulation system 5 is, for example, components such as a booster pump, and the controller 6 is, for example, a commercially available PLC controller.

[0041] As a preferred embodiment of this example, as Figure 2 and Figure 4As shown, there are three working units 2 in this embodiment, and the gas paths of the three working units 2 are connected in sequence to achieve the purpose of gradual pressurization. Each working unit 2 includes a volute 20 and an impeller 21 located in the volute 20, wherein two impellers 21 are connected to the first impeller rotating shaft 22, and the remaining impeller 21 is connected to the second impeller rotating shaft 23. The volute 20 and the side of the compressor body 1 are connected through an annular seal 24, and a small gap 28 is formed at the outer ends of the volute 20 and the annular seal 24. A sealer 4 is respectively sleeved on the first impeller rotating shaft 22 and the second impeller rotating shaft 23, and one end of the sealer 4 away from the compressor body 1 is fixed to the annular seal 24, and the annular seal 24 and the side of the compressor body 1 form an isobaric cavity K. The isobaric cavity K is formed in this way in this embodiment, which can greatly increase the volume of the isobaric cavity K, and solves the technical difficulty of the prior art that the small sealing space between the sealer and the impeller rotating shaft leads to a high production difficulty.

[0042] The inner diameter of the annular seal 24 can be adjusted to form isobaric cavities K of different volumes. For example, there are three isobaric cavities K in this embodiment. According to the pressurization process of the three working units 2, the volumes of the three isobaric cavities K gradually increase to resist the pressure of the leaked vinyl chloride gas after continuous pressurization.

[0043] Furthermore, the sealer 4 on the first impeller rotating shaft 22 is rotationally sealedly connected to the first impeller rotating shaft 22, for example, sealed by a concave-convex fit (sealing lip) manner; the sealer 4 sleeved on the second impeller rotating shaft 23 is rotationally sealedly connected to the second impeller rotating shaft 23, for example, sealed by a concave-convex fit (sealing lip) manner.

[0044] Furthermore, a positioning step 25 is provided at the end of the annular seal 24 away from the compressor body 1, and an annular boss 26 is provided at the end of the sealer 4 away from the compressor body 1. The annular boss 26 is fixed to the positioning step 25, and the two are fixed by bolts. Of course, spring washers, etc. can be added to the bolts to prevent the bolts from loosening.

[0045] The first impeller rotating shaft 22 and the second impeller rotating shaft 23 are respectively connected to the compressor body 1 for rotation. The side of the compressor body 1 is provided with oil seal rings 7 respectively sleeved on the first impeller rotating shaft 22 and the second impeller rotating shaft 23. The oil seal rings 7 and the corresponding sealers 4 are arranged at intervals. A plurality of blocking rings 27 are respectively arranged on the first impeller rotating shaft 22 and the second impeller rotating shaft 23. A plurality of sealing lips 70 are respectively arranged on the inner wall of the corresponding oil seal ring 7. The inner side of some of the sealing lips 70 is provided with a first annular inclined surface arranged inwardly, and the outer side of the remaining sealing lips 70 is provided with a second annular inclined surface arranged inwardly. The first annular inclined surface and the second annular inclined surface form an eight-shaped distribution, and some of the sealing lips 70 are located in the axial space formed by two adjacent blocking rings 27.

[0046] and at least one blocking ring 27 has a third annular inclined surface, and at least part of the first annular inclined surface fits and seals with the third annular inclined surface, so as to solve the problem of outward leakage of the isobaric cavity K from the oil sealing ring 7.

[0047] Embodiment 2

[0048] Based on Embodiment 1, as Figure 2 and Figure 6 shown, in this embodiment, specific examples are given. For example, there are three working units 2, which are defined as the first working unit 2A, the second working unit 2B, and the third working unit 2C. The air pressure after the first working unit 2A does work is less than the air pressure after the second working unit 2B does work, and the air pressure after the second working unit 2B does work is less than the air pressure after the third working unit 2C does work. And the driving mechanism 3 includes a speed increasing box 30 provided on the compressor main body 1. A driving shaft 31 is rotatably connected in the speed increasing box 30. The first impeller rotating shaft 22 and the second impeller rotating shaft 23 are parallel to each other, and the driving shaft 31 is located between the first impeller rotating shaft 22 and the second impeller rotating shaft 23. The driving shaft 31 and the first impeller rotating shaft 22 are connected through a first gear transmission structure 32, and the driving shaft 31 and the second impeller rotating shaft 23 are connected through a second gear transmission structure 33. Both the first gear transmission structure 32 and the second gear transmission structure 33 are two meshing gears. Of course, a common gear can be provided on the driving shaft 31, which can also meet the driving requirements.

[0049] The driving shaft 31 is connected to the motor.

[0050] Pressurization can be achieved by continuously reducing the inner flow path of the volute 20. It can be seen from the drawings of this embodiment that the inner flow path of the volute 20 is continuously reduced.

[0051] In addition, at the first working unit 2A, the seal 4 is a labyrinth seal, and at the second and third working units 2B / 2C, the seal 4 is a carbon ring seal, so as to meet the sealing requirements of continuous pressurization and ensure the service life requirements.

[0052] Embodiment 3

[0053] Based on Embodiment 1 or Embodiment 2, as Figure 1 shown, an oil cooling circulation system 8 connected to the speed increasing box 30 is provided on the compressor main body 1. The oil cooling circulation system is a system of cooling pipes and an additional cooling pump or oil station.

[0054] As Figures 7 - 9As shown, the oil cooling circulation system 8 includes an oil pressure station 80 and an oil cooler 81. The speed increasing gearbox 30 is connected to the oil pressure station 80 through a return oil pipe 82, so that the oil in the speed increasing gearbox 30 returns to the oil pressure station 80; the oil pressure station 80 is connected to the oil cooler 81 through two parallel outlet oil pipes 83. An oil pump 84 is installed on each outlet oil pipe 83 respectively. The oil cooler 81 is connected to the speed increasing gearbox 30 through a main oil pipe 85. The diameter of one of the two outlet oil pipes 83 is larger than that of the other outlet oil pipe 83, and the main oil pipe 85 adds the cooled oil to the speed increasing gearbox 30.

[0055] A fine filter 86 is also connected to the main oil pipe 85 to filter the oil entering the speed increasing gearbox 30.

[0056] The two outlet oil pipes 83 are defined as the main outlet oil pipe and the auxiliary outlet oil pipe. When the compressor starts to operate, the lubricating oil supplies oil to the speed increasing gearbox 30 through the auxiliary outlet oil pipe, that is, the oil pump 84 connected to the auxiliary outlet oil pipe sucks in, is cooled by the oil cooler 81 and then filtered by the fine filter 86 and sent into the speed increasing gearbox 30. When the oil pressure exceeds the set value, the oil pump 84 on the auxiliary outlet oil pipe stops working, and the lubricating oil is sucked in by the oil pump 84 on the main outlet oil pipe, is cooled by the oil cooler 81 and then filtered by the fine filter 86 and sent into the speed increasing gearbox 30.

[0057] Secondly, an oil mist treatment device 87 is also connected to the oil pressure station 80. Specifically, the oil mist treatment device 87 in this embodiment uses an air extractor for air extraction. For example, an air extraction pipe 88 is used. The lower end of the air extraction pipe 88 is open. The air extraction pipe 88 plays a role similar to air extraction, and a valve is provided on the air extraction pipe 88 to control the amount of extracted air, so that a large amount of oil mist generated during the operation of the oil cooling circulation system 8 enters the oil mist treatment device 87, and at this time, the oil mist treatment device 87 separates and treats the oil mist.

[0058] Specifically, as Figure 9 shown, the oil mist treatment device 87 includes a docking member 870 connected to the oil pressure station 80 through a pipeline. The interior of the docking member 870 at least has a conical cavity 8700 in the shape of a cone. The inner diameter of the conical cavity 8700 gradually increases from bottom to top, and an annular baffle 8701 extending radially inward of the docking member 870 is provided at the top of the conical cavity 8700. The conical cavity 8700 and the annular baffle 8701 form a turbulent flow area 8702, that is, the inner top side of the docking member 870 has a turbulent flow area 8702;

[0059] An acute angle is formed between the annular baffle 8701 and the cavity wall of the conical cavity 8700. The turbulent flow area 8702 can form a turbulent swirl of the oil mist, making the separation and treatment of the oil mist more thorough.

[0060] Secondly, an oil collecting tray 871 extending radially outward of the docking member 870 is provided on the outer top of the docking member 870, and a cover 872 with at least part of its side wall having mesh holes is provided on the oil collecting tray 871; a mesh cover 873 that divides the internal space of the cover 872 into an inner separation cavity 8720 and an outer separation cavity 8721 is provided on the top of the docking member 870 or inside the cover 872. The inner separation cavity 8720 communicates with the conical cavity 8700. A first filter screen 874 is provided in the inner separation cavity 8720, a second filter screen 875 is provided in the outer separation cavity 8721, and at least part of the lower end of the air draft pipe 88 extends into the outer separation cavity 8721.

[0061] The air draft of the air draft pipe 88 forces the oil mist in the oil pressure station 80 to enter the conical cavity 8700, the inner separation cavity 8720, and the outer separation cavity 8721 upward in sequence, and the oil in the oil mist is separated by the turbulent flow area 8702, the first filter screen 874, and the second filter screen 875. Most of the separated oil flows back downward from the conical cavity 8700 to the oil pressure station 80, and the remaining separated oil is collected by the oil collecting tray 871 and then flows back to the conical cavity 8700 through the return bypass pipe 876 that connects the outer separation cavity 8721 and the conical cavity 8700.

[0062] Preferably, the mesh cover 873 is a honeycomb hole mesh cover, and specifically, the mesh cover 873 includes a vertical annular mesh cylinder 8730 fixed to the top of the docking member 870, and a depression part 8731 that is connected to the top of the vertical annular mesh cylinder 8730 and has a downward depression in the center. At least part of the lower end of the air draft pipe 88 extends into the depression area.

[0063] The depression sub - part 8732 of the depression part 8731 is located above the side of the annular baffle 8701, and the annular baffle 8701 and the depression sub - part 8732 form an annular communication space that communicates with the bottom side of the inner separation cavity 8720. That is, the shape of the inner separation cavity 8720 is approximately "concave", and the shape of the outer separation cavity 8721 is approximately an inverted "concave".

[0064] The lower end of the first filter net 874 is connected to the inner edge of the annular baffle 8701, the upper end of the first filter net 874 is connected to the inner top with the recessed part 8731, and the first filter net 874 and the recessed sub - part 8732 are distributed at intervals, and the first filter net 874 and the vertical annular net cylinder 8730 are distributed at intervals. At the same time, the gap between the first filter net 874 and the recessed sub - part 8732 is smaller than the interval gap between the first filter net 874 and the vertical annular net cylinder 8730. The recessed sub - part 8732 includes a cylindrical part and a bottom connected to the lower end of the cylindrical part, and the recessed sub - part 8732 has a non - porous structure. The distance between the bottom of the part with the recess 8731 and the oil - receiving tray 871 is smaller than the distance between the bottom of the part with the recess 8731 and the inner top of the outer cover 872. Through this design of the distance difference, the lower end of the air draft pipe 88 can extend deeper into the outer cover 872 to provide better air draft performance.

[0065] The recessed sub - part 8732 forces the oil mist to flow radially therein and enter the inner separation cavity 8720, while at this time the first filter net 874 separates the oil mist. During this process, the oil mist in the turbulent flow area 8702 is forced to flow upward into the inner separation cavity 8720, and the oil mist flowing radially in the recessed sub - part 8732 and the oil mist flowing upward from the turbulent flow area 8702 form a "cross" flow state. During this process, the oil mist in different directions is mixed, so that the oil mist before entering the first filter net 874 is already in a uniformly mixed state, so that most of the oil in the oil mist can be separated under the filtration of the first filter net 874 to the greatest extent, and then it flows back downward from the conical cavity 8700 to the oil pressure station 80 again.

[0066] The filtration accuracy of the first filter net 874 is higher than that of the second filter net 875. For example, the first filter net 874 is a fine filter net and the second filter net 875 is a coarse filter net. And the mesh number of the filter net can be set by itself.

[0067] Both the first filter net 874 and the second filter net 875 are annular nets, and the axial length of the first filter net 874 is shorter than that of the second filter net 875. However, there is a gap between the top of the second filter net 875 and the inner top of the outer cover 872.

[0068] Finally, the inner diameter of the first filter net 874 is equal to or greater than the inner diameter of the annular baffle 8701 to prevent the oil mist from directly entering the first filter net 874 in the wall thickness direction of the first filter net 874.

[0069] The working principle of this embodiment is as follows:

[0070] The air draft pipe 88 is connected to an axial - flow fan etc., which plays a role in air extraction, so that the oil mist in the oil pressure station 80 enters the oil mist treatment device 87;

[0071] The oil mist treatment device 87 performs multi-stage separation treatment on the oil mist so that the separated oil flows back from the oil mist treatment device 87 to the oil pressure station 80.

[0072] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A vinyl chloride compressor, comprising a compressor body (1), on which a plurality of working units (2) are arranged in series with gas paths, wherein the plurality of working units (2) are all impeller-type rotating working units and are driven to work by the same driving mechanism (3), characterized in that: A sealer (4) is provided at the rotation connection between the impeller rotating shaft of each working unit (2) and the compressor body (1), and each working unit (2) and the compressor body (1) form an isobaric cavity (K) at one end of the sealer (4) close to the compressor body (1), the gas pressure in the isobaric cavity (K) is equal to the gas pressure of the vinyl chloride leaked from the working unit (2), part of the leaked vinyl chloride and part of the gas in the isobaric cavity (K) enter the sealer (4) from both ends of the sealer (4) when the working unit (2) is working, respectively, and the leaked vinyl chloride and the gas entering the sealer (4) form a convection state, and at least part of the cavity of the isobaric cavity (K) and one end of the sealer (4) close to the compressor body (1) form a vertical distribution; according to the pressurization process of the working unit (2), the volume of the isobaric cavity (K) gradually increases; There are three working units (2), and each of the working units (2) comprises a volute (20) and an impeller (21) located in the volute (20), wherein two of the impellers (21) are connected to a first impeller rotating shaft (22), and the remaining impeller (21) is connected to a second impeller rotating shaft (23), the volute (20) and the side surface of the compressor body (1) are connected via an annular seal (24), the sealer (4) is respectively sleeved on the first impeller rotating shaft (22) and the second impeller rotating shaft (23), one end of the sealer (4) away from the compressor body (1) is fixed to the annular seal (24), and the annular seal (24) and the side surface of the compressor body (1) form the isobaric cavity (K); The first impeller rotating shaft (22) and the second impeller rotating shaft (23) are respectively rotatably connected to the compressor body (1); an oil seal ring (7) is provided on the side of the compressor body (1) and is respectively sleeved on the first impeller rotating shaft (22) and the second impeller rotating shaft (23); the oil seal ring (7) and the corresponding seal (4) are arranged at intervals.

2. The vinyl chloride compressor according to claim 1, characterized in that: A pressure sensor (K1) is provided in the isobaric cavity (K), the isobaric cavity (K) is connected to an air pressure regulating system (5), and the pressure sensor (K1) and the air pressure regulating system (5) are respectively connected to a controller (6).

3. The vinyl chloride compressor according to claim 1, characterized in that: The sealer (4) sleeved on the first impeller rotating shaft (22) is connected to the first impeller rotating shaft (22) in a rotational sealing manner; the sealer (4) sleeved on the second impeller rotating shaft (23) is connected to the second impeller rotating shaft (23) in a rotational sealing manner.

4. The vinyl chloride compressor according to claim 1, characterized in that: A positioning step (25) is provided at one end of the annular seal (24) away from the compressor body (1), and an annular boss (26) is provided at one end of the sealer (4) away from the compressor body (1), wherein the annular boss (26) is fixed to the positioning step (25).

5. The vinyl chloride compressor according to claim 1, characterized in that: The sealer (4) is any one of a carbon ring sealer and a composite material sealer.

6. The vinyl chloride compressor according to claim 1, characterized in that: There are three working units (2), which are defined as a first working unit (2A), a second working unit (2B) and a third working unit (2C); the air pressure of the first working unit (2A) after working is lower than the air pressure of the second working unit (2B) after working, and the air pressure of the second working unit (2B) after working is lower than the air pressure of the third working unit (2C) after working.

7. The vinyl chloride compressor according to claim 1, characterized in that: The driving mechanism (3) comprises a speed increasing box (30) arranged on the compressor body (1), a driving shaft (31) being rotatably connected in the speed increasing box (30), the first impeller rotating shaft (22) and the second impeller rotating shaft (23) being parallel to each other and the driving shaft (31) being located between the first impeller rotating shaft (22) and the second impeller rotating shaft (23), the driving shaft (31) and the first impeller rotating shaft (22) being connected via a first gear transmission structure (32), and the driving shaft (31) and the second impeller rotating shaft (23) being connected via a second gear transmission structure (33).

8. The vinyl chloride compressor according to claim 7, characterized in that: An oil cooling circulation system (8) connected to the speed increasing gearbox (30) is provided on the compressor body (1).

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