Vinyl chloride compressor

Abstract

The invention relates to a vinyl chloride compressor. The defects of unreasonable design and the like in the prior art are overcome. The vinyl chloride compressor comprises a compressor main body, a plurality of acting units which are sequentially connected in series through gas paths are arranged on the compressor main body, the acting units are driven by the same driving mechanism to act, and a sealer is arranged at the rotating joint of an impeller rotating shaft of each acting unit and the compressor main body. Each acting unit and the compressor body form an isobaric cavity at the end, close to the compressor body, of the sealer, and the air pressure in the isobaric cavity is equal to the air pressure of part of vinyl chloride leaked from the acting units. Leaked vinyl chloride generated when the acting unit acts and part of gas in the isobaric cavity enter the sealer from the two ends of the sealer respectively, and the leaked vinyl chloride and the gas entering the sealer form a convection state. The sealing device has the advantage that leakage of leaked vinyl chloride in the sealing device can be stopped due to the formed convection state.

Description

Technical Field

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

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

[0003] In the industrial production process, a compressor is used to transmit vinyl chloride to work on it. When working, the axial sealing of the impeller's rotating shaft is a difficult point. For example, Chinese patent No. CN202123251715.9 discloses a vinyl chloride centrifugal turbine compressor, including a motor, a high-speed shaft, a first-stage compression cylinder, and a second-stage compression cylinder connected to 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. The first-stage compression cylinder and the second-stage compression cylinder are respectively provided with a first-stage impeller and a second-stage impeller at the first-stage inlet and the second-stage inlet, and the first-stage impeller and the second-stage impeller are fixed to the two ends of the high-speed shaft. The vinyl chloride gas passes through the first-stage pressurization of the first-stage impeller and the second-stage pressurization of the second-stage impeller in turn; the compressor is also provided with an air sealing chamber for preventing leakage of vinyl chloride gas, and the air sealing chamber is located at the non-end of the high-speed shaft. This solution uses a primary impeller and a secondary impeller to perform secondary centrifugal pressurization on the vinyl chloride gas, achieving the beneficial effects of high speed, high gas pressure and low energy consumption; at the same time, a gas sealing chamber is set up to keep the vinyl chloride gas sealed during pressurization, avoiding the problem of oil content in the vinyl chloride gas.

[0004] In the above scheme, an annular gas sealing cavity is provided inside the first compression cylinder and the second compression cylinder, and the gas sealing cavity is used to prevent the vinyl chloride gas from leaking from the gap. Although this method can solve the leakage problem to a certain extent, this scheme belongs to the passive sealing form, using the sealed gas sealing cavity to form a barrier to the leakage of vinyl chloride. Since the gas sealing cavity is in a relative rotation relationship between the comb teeth and the sealing teeth, wear is inevitable, so it is difficult to prevent the leakage of vinyl chloride when the sealing performance decreases and the pressure is gradually increased. Summary of the invention

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

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The vinyl chloride compressor comprises a compressor body, on which a plurality of working units are arranged with gas paths connected in series in sequence, the plurality of working units are all impeller-type rotating working units and are driven to work by the same driving mechanism, a sealer is arranged at the rotating connection between the impeller rotating shaft of each working unit and the compressor body, and each working unit and the compressor body form an isobaric cavity at one end of the sealer close to the compressor body, the gas pressure in the isobaric cavity is equal to the gas pressure of part of the vinyl chloride leaked from the working unit, the leaked vinyl chloride and part of the gas in the isobaric cavity enter the sealer from both ends of the sealer when the working unit is working, the leaked vinyl chloride and the gas entering the sealer form a convection state, at least part of the cavity of the isobaric cavity and one end of the sealer close to the compressor body form a vertical distribution; according to the pressurization process of the working unit, the volume of the isobaric cavity gradually increases.

[0007] 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.

[0008] In the above-mentioned vinyl chloride compressor, there are three working units, and each of the working units includes a volute and an impeller located in the volute, wherein two of the impellers are connected to the first impeller rotating shaft, and the remaining impeller is connected to the second impeller rotating shaft, the volute and the side of the compressor body are connected through an annular seal, the first impeller rotating shaft and the second impeller rotating shaft are respectively covered with the sealer, one end of the sealer away from the compressor body is fixed to the annular seal, and the annular seal and the side of the compressor body form the isobaric cavity.

[0009] In the above-mentioned vinyl chloride compressor, the sealer sleeved on the first impeller rotating shaft is rotationally sealed and connected to the first impeller rotating shaft; the sealer sleeved on the second impeller rotating shaft is rotationally sealed and connected to the second impeller rotating shaft.

[0010] In the above-mentioned vinyl chloride compressor, a positioning step is provided at one end of the annular seal away from the compressor body, and an annular boss is provided at one end of the seal away from the compressor body, and the annular boss is fixed to the positioning step.

[0011] In the above-mentioned vinyl chloride compressor, the sealer is any one of a carbon ring sealer and a composite material sealer.

[0012] In the above-mentioned vinyl chloride compressor, there are three working units, which are defined as a first working unit, a second working unit and a third working unit. The air pressure after the first working unit performs work is lower than the air pressure after the second working unit performs work, and the air pressure after the second working unit performs work is lower than the air pressure after the third working unit performs work.

[0013] In the above-mentioned vinyl chloride compressor, the first impeller rotating shaft and the second impeller rotating shaft are respectively connected to the compressor body for rotation, and oil sealing rings are provided on the side of the compressor body and are respectively sleeved on the first impeller rotating shaft and the second impeller rotating shaft, and the oil sealing rings and the corresponding seals are distributed at intervals.

[0014] In the above-mentioned vinyl chloride compressor, the driving mechanism includes a speed increasing gearbox arranged on the compressor body, a driving shaft is rotatably connected in the speed increasing gearbox, 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 by a first gear transmission structure, and the driving shaft and the second impeller rotating shaft are connected by a second gear transmission structure.

[0015] In the above-mentioned vinyl chloride compressor, according to the pressurization process of the three working units, the volumes of the three isobaric cavities gradually increase.

[0016] In the above-mentioned vinyl chloride compressor, the compressor body is provided with an oil cooling circulation system connected to the speed increasing gearbox.

[0017] Compared with the existing technology, the advantages of this application are: The convection state formed can stop the leakage of vinyl chloride in the sealer. When the sealing performance of the sealer decreases, the leakage of vinyl chloride can still be avoided due to the equal air pressure setting. It can achieve the purpose of long-term use and avoids the phenomenon of frequent replacement of sealers. It can ensure the safety of vinyl chloride transportation and work, and at the same time reduce the maintenance cost and difficulty of the compressor.

[0018] The compressor oil station forms a circulating supply of lubricating oil in the speed increaser through oil cooling to extend the service life of the speed increaser. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of the structure of the vinyl chloride compressor provided by the present invention from a top view.

[0020] Figure 2 The present invention provides a cross-sectional structural schematic diagram of a vinyl chloride compressor.

[0021] Figure 3It is a schematic diagram of the top view structure of the compressor body provided by the present invention.

[0022] Figure 4 yes Figure 2 Enlarged structural diagram at F in the middle.

[0023] Figure 5 It is a control block diagram provided by the present invention.

[0024] Figure 6 It is a structural schematic diagram of embodiment 2 provided by the present invention.

[0025] Figure 7 The figure is a schematic diagram of the side structure of the vinyl chloride compressor provided by the present invention.

[0026] Figure 8 It is a partial top view structural schematic diagram of the vinyl chloride compressor provided by the present invention.

[0027] Fig. 9 It is a structural schematic diagram of the oil mist treatment device provided by the present invention.

[0028] In the figure, the compressor body 1, the inlet 10, the outlet 11, the working unit 2, the volute 20, the impeller 21, the first impeller rotating shaft 22, the second impeller rotating shaft 23, the annular seal 24, the positioning step 25, the annular shoulder 26, the blocking ring 27, the small gap 28, the driving mechanism 3, the speed increaser 30, the driving shaft 31, the first gear transmission structure 32, the second gear transmission structure 33, the seal 4, the air pressure regulating system 5, the controller 6, the oil seal 7, the sealing lip 70, the isobaric cavity K, the pressure sensor K1, the first working unit 2A, the second working unit 2B, the third working unit Element 2C, oil cooling circulation system 8, oil pressure station 80, oil cooler 81, oil return pipe 82, oil outlet pipe 83, oil pump 84, main oil pipe 85, fine filter 86, oil mist treatment device 87, docking piece 870, conical cavity 8700, annular baffle 8701, turbulent zone 8702, oil receiving pan 871, outer cover 872, inner separation cavity 8720, outer separation cavity 8721, mesh cover 873, upright annular mesh cylinder 8730, with recessed portion 8731, recessed sub-portion 8732, first filter screen 874, second filter screen 875, reflux bypass pipe 876, and air duct 88. DETAILED DESCRIPTION

[0029] The following are specific embodiments of the invention and combined with the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0030] Embodiment 1

[0031] like Figure 1-Figure 3As shown, the vinyl chloride compressor includes a compressor body 1, and 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 plurality of working units 2 whose gas paths are connected in series in sequence are arranged on the compressor body 1. The plurality of working units 2 are all impeller-type rotating working units and are driven to do work by the same driving mechanism 3. There are 2-4 working units 2.

[0032] A sealer 4 is provided at the rotating 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 sealer 4 is any one of a carbon ring sealer and a composite sealer. The composite material is, for example, graphite-filled polytetrafluoroethylene. This material has self-lubrication and stability. When the rotating shaft and the sealer are scratched, because the graphite-filled polytetrafluoroethylene is relatively soft compared to the material of the shaft and has self-lubrication, it can protect the shaft from damage during contact. At the same time, the sealing teeth on the shaft can have slight contact with this material, and the gap is controlled to be very small, ensuring the sealing performance. For example, a pressurized inert gas 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 working unit 2. When the working unit 2 is working, 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, respectively. The leaked vinyl chloride and the gas entering the sealer 4 form a convection state. The formed convection state can stop the leakage of vinyl chloride in the sealer 4. When the sealing performance of the sealer 4 decreases, the leakage of vinyl chloride can still be avoided due to the equal air pressure setting in this embodiment. It can achieve the purpose of long-term use, avoid the phenomenon of frequent replacement of the sealer, ensure the safety of vinyl chloride transportation work, and reduce the maintenance cost and difficulty of the compressor.

[0033] And this method of the embodiment can make it unnecessary for the impeller to be manufactured in a closed manner, so as to further reduce the manufacturing cost and save the sealing cost at the impeller.

[0034] Secondly, at least part of the isobaric cavity K and the sealer 4 are vertically distributed at one end close to the compressor body 1. Due to the vertical state of at least part of the cavity, at least part of the isobaric cavity K can form a leaking vinyl chloride cutoff to prevent the leaking vinyl chloride from continuing to leak along the axial direction of the impeller rotating shaft.

[0035] In addition, according to the pressurization process of several working units 2, the volumes of several isobaric cavities K gradually increase. After the working units 2 do work on the vinyl chloride, the pressure of the vinyl chloride is continuously pressurized. The further designed isobaric cavities K with gradually increasing volumes can make the gradually pressurized vinyl chloride have a gradually increasing accommodation volume in the corresponding isobaric cavities K to counteract the vinyl chloride of the corresponding pressure, thereby ensuring that the sealing performance of the sealer 4 remains consistent and extending its service life.

[0036] In order to achieve pressure control, Figure 5 As shown, a pressure sensor K1 is provided in the isobaric cavity K, and the isobaric cavity K is connected to the air pressure regulating system 5, and the pressure sensor K1 and the air pressure regulating system 5 are respectively connected to the controller 6. The pressure sensor K1 detects the air pressure in the isobaric cavity K, and if the pressure of the leaked vinyl chloride gas is higher than the air pressure in the isobaric cavity K, the pressure in the isobaric cavity K will increase, and the controller 6 starts the air pressure regulating system 5 after receiving the signal, and inputs the gas equal to the pressure of the leaked vinyl chloride gas into the isobaric cavity K to form an equal equilibrium pressure. Each isobaric cavity K is respectively provided with a discharge valve, and when the vinyl chloride stops entering the compressor, the discharge valve is opened, and the gas in the isobaric cavity K and the leaked vinyl chloride gas are discharged from the discharge valve and collected to prevent the gas in the isobaric cavity K from entering the working unit 2.

[0037] In a preferred embodiment, a vinyl chloride detection sensor is provided at one end of the sealer 4 close to the impeller, and an inert gas detection sensor is provided at one end of the sealer 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, and in this embodiment, they are connected by wireless communication.

[0038] The air pressure regulating system 5 is, for example, a booster pump and other components, and the controller 6 is, for example, a commercially available PLC controller.

[0039] As a preferred solution of this embodiment, 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] At least one blocking ring 27 has a third annular inclined surface, and at least a portion of the first annular inclined surface is sealed with the third annular inclined surface, so as to solve the problem of leakage of the isobaric cavity K from the oil seal ring 7.

[0045] Embodiment 2

[0046] Based on Example 1, Figure 2 and Figure 6 As shown, this embodiment provides a specific example, for example, there are three working units 2 and they 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 increaser 30 arranged on the compressor body 1, a driving shaft 31 is rotatably connected in the speed increaser 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 by a first gear transmission structure 32, and the driving shaft 31 and the second impeller rotating shaft 23 are connected by a second gear transmission structure 33. The first gear transmission structure 32 and the second gear transmission structure 33 are both two gears meshing with each other. Of course, a common gear can be set on the driving shaft 31, which can also meet the driving requirements.

[0047] The driving shaft 31 is connected to the motor.

[0048] The purpose of continuous pressurization can be achieved by continuously reducing the internal flow channel of the volute 20. As can be seen from the drawings of this embodiment, the internal flow channel of the volute 20 is continuously reduced.

[0049] In addition, at the first working unit 2A, the sealer 4 uses a labyrinth sealer, and at the second and third working units 2B / 2C, the sealer 4 uses a carbon ring sealer to meet the requirements of continuous pressurization and ensure service life.

[0050] Embodiment 3

[0051] Based on Example 1 or Example 2, Figure 1 As shown, an oil cooling circulation system 8 connected to the speed increasing box 30 is provided on the compressor body 1. The oil cooling circulation system is a system including cooling pipes and a cooling pump or an oil station.

[0052] like Figure 7-Figure 9As shown, the oil cooling circulation system 8 includes an oil pressure station 80 and an oil cooler 81. The speed increasing box 30 is connected to the oil pressure station 80 through an oil return pipe 82 so that the oil in the speed increasing box 30 returns to the oil pressure station 80; the oil pressure station 80 is connected to the oil cooler 81 through two parallel oil outlet pipes 83, and an oil pump 84 is installed on each oil outlet pipe 83. The oil cooler 81 is connected to the speed increasing box 30 through a main oil pipe 85. The diameter of one of the two oil outlet pipes 83 is larger than the diameter of the other oil outlet pipe 83. The main oil pipe 85 adds the cooled oil to the speed increasing box 30.

[0053] A fine filter 86 is also connected to the main oil pipe 85 to filter the oil entering the speed increasing box 30 .

[0054] The two oil outlet pipes 83 are defined as a main oil outlet pipe and an auxiliary oil outlet pipe. When the compressor starts to run, the lubricating oil is supplied to the speed increasing box 30 through the auxiliary oil outlet pipe, that is, the oil pump 84 connected to the auxiliary oil outlet pipe sucks the oil, cools the oil through the oil cooler 81, and then filters the oil through the fine filter 86 before being delivered to the speed increasing box 30. When the oil pressure exceeds the set value, the oil pump 84 on the auxiliary oil outlet pipe stops working, and the lubricating oil is sucked through the oil pump 84 on the main oil outlet pipe, cools the oil through the oil cooler 81, and then filters the oil through the fine filter 86 before being delivered to the speed increasing box 30.

[0055] Secondly, an oil mist treatment device 87 is also connected to the oil pressure station 80. Specifically, the oil mist treatment device 87 of this embodiment uses an induced draft device to extract air, for example, an induced draft pipe 88 is used. The lower end of the induced draft pipe 88 is open, and the induced draft pipe 88 plays a similar role as exhausting air. A valve is provided on the induced draft pipe 88 to control the amount of air extracted, so that a large amount of oil mist generated by the operation of the oil cooling circulation system 8 enters the oil mist treatment device 87. At this time, the oil mist treatment device 87 separates and treats the oil mist.

[0056] Specifically, Fig. 9 As shown, the oil mist treatment device 87 includes a docking piece 870 connected to the oil pressure station 80 through a pipeline, the interior of the docking piece 870 at least has a conical cavity 8700 in a conical shape, the inner diameter of the conical cavity 8700 gradually increases from bottom to top, and an annular baffle 8701 extending radially inward from the docking piece 870 is provided at the top of the conical cavity 8700, and the conical cavity 8700 and the annular baffle 8701 form a turbulent area 8702, that is, the inner top side of the docking piece 870 has a turbulent area 8702; The annular baffle 8701 and the wall of the conical cavity 8700 form an acute angle, and the turbulent zone 8702 can form turbulent vortexes for the oil mist, making the oil mist separation process more thorough.

[0057] Secondly, an oil receiving pan 871 extending radially outward from the docking piece 870 is provided at the outer top of the docking piece 870, and an outer cover 872 having mesh holes on at least a portion of the side walls is provided on the oil receiving pan 871; a mesh cover 873 is provided at the top of the docking piece 870 or in the outer cover 872, which divides the internal space of the outer cover 872 into an inner separation cavity 8720 and an outer separation cavity 8721, the inner separation cavity 8720 and the conical cavity 8700 are connected, 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 the lower end of the air duct 88 at least partially extends into the outer separation cavity 8721.

[0058] The air induced by the air induced 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 through the turbulent area 8702, the first filter 874 and the second filter 875. Most of the separated oil flows downward from the conical cavity 8700 back to the oil pressure station 80, and the remaining separated oil is collected by the oil receiving pan 871, and then flows back to the conical cavity 8700 from the return bypass pipe 876 connecting the outer separation cavity 8721 and the conical cavity 8700.

[0059] Preferably, the mesh cover 873 is a honeycomb mesh cover, and the mesh cover 873 specifically includes an upright annular mesh tube 8730 fixed to the top of the docking piece 870, and a recessed portion 8731 connected to the top of the upright annular mesh tube 8730 and having a downward recessed center, and the lower end of the air duct 88 at least partially extends into the recessed area.

[0060] The concave sub-portion 8732 with the concave portion 8731 is located above the annular baffle 8701, and the annular baffle 8701 and the concave sub-portion 8732 form an annular communication space that is connected to the inner bottom side of the inner separation cavity 8720. That is, the shape of the inner separation cavity 8720 is approximately the Chinese character "concave", and the shape of the outer separation cavity 8721 is approximately the inverted Chinese character "concave".

[0061] The lower end of the first filter screen 874 is connected to the inner edge of the annular baffle 8701, the upper end of the first filter screen 874 is connected to the inner top of the recessed portion 8731, and the first filter screen 874 and the recessed sub-portion 8732 are spaced apart, and the first filter screen 874 and the vertical annular net cylinder 8730 are spaced apart. At the same time, the gap between the first filter screen 874 and the recessed sub-portion 8732 is smaller than the gap between the first filter screen 874 and the vertical annular net cylinder 8730. The recessed sub-portion 8732 includes a cylindrical portion and a bottom connected to the lower end of the cylindrical portion, and the recessed sub-portion 8732 is a non-porous structure. The distance between the bottom of the recessed portion 8731 and the oil receiving pan 871 is smaller than the distance between the bottom of the recessed portion 8731 and the inner top of the outer cover 872. Through this distance difference design, the lower end of the air duct 88 can be extended longer into the outer cover 872 to provide better air induced performance.

[0062] The recessed sub-portion 8732 forces the oil mist to flow in its radial direction and enter the inner separation cavity 8720, and the first filter 874 at this time separates the oil mist. In this process, the oil mist in the turbulent zone 8702 is forced to enter the inner separation cavity 8720 upward, and the oil mist flowing radially in the recessed sub-portion 8732 and the oil mist flowing upward from the turbulent zone 8702 form a "cross" flow state. In this process, the oil mists in different directions are mixed, so that the oil mist before entering the first filter 874 is already in a uniformly mixed state, so that most of the oil in the oil mist can be separated to the greatest extent under the filtration of the first filter 874, and then flow back downward from the conical cavity 8700 to the oil pressure station 80.

[0063] The filtering accuracy of the first filter 874 is higher than that of the second filter 875. For example, the first filter 874 is a fine filter, and the second filter 875 is a coarse filter. The number of meshes of the filter can be set by the user.

[0064] The first filter screen 874 and the second filter screen 875 are both annular screens, and the axial length of the first filter screen 874 is shorter than the axial length of the second filter screen 875 . However, there is a gap between the top of the second filter screen 875 and the inner top of the outer cover 872 .

[0065] Finally, the inner diameter of the first filter screen 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 screen 874 in the wall thickness length direction of the first filter screen 874 .

[0066] The working principle of this embodiment is as follows: The air duct 88 is connected to an axial flow fan and the like to extract air so that the oil mist in the oil pressure station 80 enters the oil mist treatment device 87; 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 .

[0067] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they 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, 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.

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: 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).

4. The vinyl chloride compressor according to claim 3, 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.

5. The vinyl chloride compressor according to claim 3, 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).

6. The vinyl chloride compressor according to claim 3, characterized in that: The sealer (4) is any one of a carbon ring sealer and a composite material sealer.

7. The vinyl chloride compressor according to claim 3, 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.

8. The vinyl chloride compressor according to claim 3, characterized in that: 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.

9. The vinyl chloride compressor according to claim 3, 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).

10. The vinyl chloride compressor according to claim 9, 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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