CN112377410A - Sealed effectual mechanical vacuum pump - Google Patents
Sealed effectual mechanical vacuum pump Download PDFInfo
- Publication number
- CN112377410A CN112377410A CN202011250575.0A CN202011250575A CN112377410A CN 112377410 A CN112377410 A CN 112377410A CN 202011250575 A CN202011250575 A CN 202011250575A CN 112377410 A CN112377410 A CN 112377410A
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- CN
- China
- Prior art keywords
- sealing
- vacuum pump
- sealing ring
- impeller
- mechanical vacuum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
- F04C19/005—Details concerning the admission or discharge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
- F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention discloses a mechanical vacuum pump with good sealing effect, which comprises an assembly base, a compensation structure and a sealing structure, wherein a shell is fixed above the assembly base, an impeller shaft is arranged in the shell, an impeller is connected to the outer side of the impeller shaft, working liquid is arranged on the outer side of the impeller, an air inlet is arranged at the right lower end of the impeller shaft, an air outlet is arranged at the left lower end of the impeller shaft, assembly stabilizing structures are arranged on the left side and the right side of the assembly base, the compensation structure is arranged on the left side of the shell, an exhaust pipe is connected to the left upper end of the shell, and an exhaust pipe is arranged on the right side of the exhaust pipe. The invention can compensate the working liquid in the vacuum pump through the arranged compensation structure, thus ensuring the sufficiency of the working liquid and the working efficiency of the vacuum pump, and the arranged sealing ring groove, the sealing ring and the sealing sleeve can play the double sealing effect, thereby being convenient for filling the working liquid.
Description
Technical Field
The invention relates to the technical field of mechanical vacuum pumps, in particular to a mechanical vacuum pump with a good sealing effect.
Background
The mechanical pump consists of two parts, namely a motor and a pump body. The common mechanical pump is characterized in that a pump shaft is driven to rotate by a motor through a belt; the direct-connected mechanical pump is characterized in that a motor is directly connected with a pump shaft, and an intermediate transmission link is omitted. The mechanical pump uses the principle of gas expansion, compression and discharge to pump gas out of the container. Mechanical pumps are so called because they utilize mechanical means to periodically change the volume of the suction chamber within the pump, causing the gas in the reservoir to be continually expanded into the suction chamber through the intake port of the pump and then expelled out of the pump through the exhaust port by compression. The modes for changing the volume of the air suction cavity in the pump are a piston reciprocating type, a fixed-vane type and a rotary-vane type, which are respectively called as a reciprocating mechanical pump, a fixed-vane mechanical pump and a rotary-vane mechanical pump.
The problem that working liquid is inconvenient to supplement and add exists when an existing vacuum pump is used, the problem that a sealing effect is poor exists when the vacuum pump is used, the problem that the vacuum pump is fixed and not fastened is also existed when the vacuum pump is used, the use requirements of people can not be well met, and technical innovation is carried out on the basis of the existing mechanical vacuum pump according to the situation.
Disclosure of Invention
The invention aims to provide a mechanical vacuum pump with good sealing effect, which aims to solve the problems that the existing vacuum pump in the prior art is inconvenient to supplement and add working fluid when in use, has poor sealing effect when in use, has the problem of loose assembly and fixation when in use, and cannot well meet the use requirements of people.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a sealed effectual mechanical vacuum pump, includes assembly base, compensation structure and seal structure, the top of assembly base is fixed with the casing, and the inside of casing is provided with the impeller shaft, the outside of impeller shaft is connected with the impeller, and the outside of impeller is provided with the working solution, the right lower extreme of impeller shaft is provided with the air inlet, and the left lower extreme of impeller shaft is provided with the gas vent, the left and right sides of assembly base all is provided with assembly stable structure, the compensation structure sets up in the left side of casing, the upper left end of casing is connected with the blast pipe, and the right side of blast pipe is provided with the exhaust tube, seal structure sets up in the upper end of exhaust tube.
Preferably, the assembly stabilizing structure comprises a fixing bolt, a damping spring and a fixing nut, the damping spring is arranged on the outer side of the fixing bolt, and the fixing nut is arranged at the bottom end of the fixing bolt.
Preferably, the assembly stabilizing structure is symmetrically provided with two groups about the vertical center line of the assembly base, the fixing bolts penetrate through the inside of the assembly base, and the fixing bolts form an elastic structure with the assembly base through the damping springs.
Preferably, the compensation structure includes compensation liquid case, scale mark, sealed steel ball, reset spring and communicating pipe, and the surface of compensation liquid case is provided with the scale mark, the bottom of compensation liquid case is provided with sealed steel ball, and the bottom of sealed steel ball is connected with reset spring to reset spring's bottom is provided with communicating pipe.
Preferably, the compensation liquid tank is communicated with the shell through a communicating pipe, and an elastic telescopic structure is formed between the sealing steel ball and the return spring.
Preferably, the sealing structure comprises a connecting bolt, a sealing ring groove, a sealing ring, a sealing sleeve and a locking bolt, the inner side of the connecting bolt is provided with the sealing ring groove, the sealing ring is arranged in the sealing ring groove, the outer side of the connecting bolt is provided with the sealing sleeve, and the two ends of the sealing sleeve are provided with the locking bolt.
Preferably, the sealing ring groove is matched with the sealing ring, the sealing sleeve is in threaded connection with the locking bolt, and the sealing sleeve is sleeved with the exhaust pipe.
Compared with the prior art, the invention has the following beneficial effects:
the vacuum pump can be conveniently assembled and mounted through the arranged assembly stabilizing structure, so that the mounting stability of the mechanical vacuum pump can be ensured, and meanwhile, the damping spring can play a role in buffering and damping during fixing;
the compensation structure can compensate the working liquid in the vacuum pump, so that the sufficiency of the working liquid can be ensured, the working efficiency of the vacuum pump can be ensured, and meanwhile, the compensation liquid tank with the transparent structure can conveniently observe the compensation liquid amount in the compensation liquid tank, so that the sufficiency of the working liquid can be ensured;
the sealing structure can ensure the sealing property of the connection between the vacuum pump and other devices, and the connecting bolt can conveniently and fixedly connect the exhaust pipe with other devices, so that the connection stability can be ensured.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic top view of the exhaust tube of the present invention;
FIG. 3 is a schematic view of a compensation liquid tank according to the present invention;
FIG. 4 is an enlarged view of a portion A of FIG. 1 according to the present invention.
In the figure: 1. assembling a base; 2. a housing; 3. an impeller shaft; 4. an impeller; 5. an air inlet; 6. an exhaust port; 7. a working fluid; 8. assembling the stable structure; 801. fixing the bolt; 802. a damping spring; 803. fixing a nut; 9. a compensation structure; 901. a compensation liquid tank; 902. scale marking; 903. sealing the steel ball; 904. a return spring; 905. a communicating pipe; 10. an exhaust pipe; 11. an air exhaust pipe; 12. a sealing structure; 121. a connecting bolt; 122. sealing the ring groove; 123. a seal ring; 124. sealing and replacing the sleeve; 125. and locking the bolt.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: the utility model provides a sealed effectual mechanical vacuum pump, including assembly base 1, compensation structure 9 and seal structure 12, assembly base 1's top is fixed with casing 2, and casing 2's inside is provided with impeller shaft 3, the outside of impeller shaft 3 is connected with impeller 4, and impeller 4's the outside is provided with working solution 7, the right lower extreme of impeller shaft 3 is provided with air inlet 5, and the left lower extreme of impeller shaft 3 is provided with gas vent 6, assembly base 1's the left and right sides all is provided with assembly stable structure 8, compensation structure 9 sets up in casing 2's left side, casing 2's upper left end is connected with blast pipe 10, and the right side of blast pipe 10 is provided with exhaust tube 11, seal structure 12 sets up in the upper end of exhaust tube 11.
In the invention: the assembly stabilizing structure 8 comprises a fixing bolt 801, damping springs 802 and a fixing nut 803, the damping springs 802 are arranged on the outer side of the fixing bolt 801, the fixing nut 803 is arranged at the bottom end of the fixing bolt 801, the assembly stabilizing structure 8 is symmetrically arranged in two groups relative to the vertical center line of the assembly base 1, the fixing bolt 801 penetrates through the inside of the assembly base 1, and an elastic structure is formed between the fixing bolt 801 and the assembly base 1 through the damping springs 802; the assembly stable structure 8 through setting up can conveniently carry out the erection of assembly to the vacuum pump, so can guarantee the stability of mechanical vacuum pump installation, can play the absorbing effect of buffering when fixed through damping spring 802's setting simultaneously.
In the invention: compensation structure 9 includes compensating liquid case 901, scale mark 902, sealed steel ball 903, reset spring 904 and communicating pipe 905, and the surface of compensating liquid case 901 is provided with scale mark 902, the bottom of compensating liquid case 901 is provided with sealed steel ball 903, and the bottom of sealed steel ball 903 is connected with reset spring 904, and reset spring 904's bottom is provided with communicating pipe 905, compensating liquid case 901 passes through intercommunication each other between 905 and the casing 2, and constitute the elastic telescopic structure between sealed steel ball 903 and the reset spring 904, compensation structure 9 through setting up can play the effect of compensation to working solution 7 in the vacuum pump, so can guarantee working solution 7's sufficiency, so can guarantee the work efficiency of vacuum pump, compensating liquid case 901 of transparent structure can conveniently observe its inside compensating solution volume simultaneously, with this can conveniently annotate working solution 7.
In the invention: the sealing structure 12 comprises a connecting bolt 121, a sealing ring groove 122, a sealing ring 123, a sealing sleeve 124 and a locking bolt 125, wherein the sealing ring groove 122 is arranged on the inner side of the connecting bolt 121, the sealing ring 123 is arranged in the sealing ring groove 122, the sealing sleeve 124 is arranged on the outer side of the connecting bolt 121, the locking bolt 125 is arranged at two ends of the sealing sleeve 124, the sealing ring groove 122 is matched with the sealing ring 123, the sealing sleeve 124 is in threaded connection with the locking bolt 125, and the sealing sleeve 124 is in sleeve connection with the suction pipe 11; can guarantee the leakproofness of being connected between vacuum pump and other devices through the seal structure 12 that sets up, connecting bolt 121 can conveniently carry out fixed connection between exhaust tube 11 and the other simultaneously, so can guarantee the stability of connecting, and the sealed annular groove 122, the sealing ring 123 and the sealed cover 124 of trading that set up can play double seal's effect, so can fully guarantee its leakproofness.
The working principle of the mechanical vacuum pump with good sealing effect is as follows: firstly, the assembly base 1 can support and fix the vacuum pump, the assembly base 1 can be installed at a proper position through the assembly stabilizing structure 8, the fixing bolt 801 can penetrate through the assembly base 1, so that the assembly base 1 can be connected with other devices, the damping spring 802 can play a damping effect, the arranged fixing nut 803 can be fixed, the exhaust pipe 11 can be connected with other devices through the connecting bolt 121, meanwhile, the sealing performance of the connection can be ensured through the sealing ring groove 122 and the sealing ring 123, so that a first resealing effect can be achieved, the sealing change sleeve 124 can be sleeved at the connection position of the exhaust pipe 11, the sealing change sleeve 124 can be locked by screwing the locking bolt 125, so that the sealing change sleeve 124 can be tightly attached to the connection position, so that the sealing performance of the connection position can be ensured, and a second resealing effect can be achieved, the impeller shaft 3 can drive the impeller 4 to rotate, when the impeller 4 rotates clockwise, the working liquid 7 is thrown to the periphery by the impeller 4, and due to the action of centrifugal force, the working liquid 7 forms a closed ring which is approximately equal in thickness and is determined by the shape of a pump cavity; the inner surface of the upper part of the water ring is just tangent to the hub of the impeller 4, and the inner surface of the lower part of the water ring is just contacted with the top end of the blade; at the moment, a crescent space is formed between the hub of the impeller 4 and the water ring, and the space is divided into a plurality of small cavities with the same number of blades by the impeller 4; if the upper part 0 degree of the impeller 4 is taken as a starting point, the volume of a small cavity is changed from small to large when the impeller 4 rotates for 180 degrees and is communicated with the air inlet 5 on the end face, at the moment, the gas is sucked through the exhaust pipe 11, and the small cavity is isolated from the air inlet 5 when the air suction is finished; when the impeller 4 continues to rotate, the small cavity is changed from big to small, so that the gas is compressed; when the small cavity is communicated with the exhaust port 6, gas is exhausted out of the pump through the exhaust pipe 10, when the working liquid 7 in the pump is reduced, the liquid in the compensation liquid tank 901 compresses the sealing steel ball 903 to enable the return spring 904 to contract, so that the working liquid 7 can flow into the communication pipe 905, the communication pipe 905 is communicated with the shell 2, and the compensation effect on the working liquid 7 can be achieved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a sealed effectual mechanical vacuum pump, includes assembly base (1), compensation structure (9) and seal structure (12), its characterized in that: the top of assembly base (1) is fixed with casing (2), and the inside of casing (2) is provided with impeller shaft (3), the outside of impeller shaft (3) is connected with impeller (4), and the outside of impeller (4) is provided with working solution (7), the right lower extreme of impeller shaft (3) is provided with air inlet (5), and the left lower extreme of impeller shaft (3) is provided with gas vent (6), the left and right sides of assembly base (1) all is provided with assembly stable structure (8), compensation structure (9) set up in the left side of casing (2), the upper left end of casing (2) is connected with blast pipe (10), and the right side of blast pipe (10) is provided with exhaust tube (11), seal structure (12) set up in the upper end of exhaust tube (11).
2. A mechanical vacuum pump with good sealing effect as claimed in claim 1, wherein: the assembly stabilizing structure (8) comprises a fixing bolt (801), a damping spring (802) and a fixing nut (803), the damping spring (802) is arranged on the outer side of the fixing bolt (801), and the fixing nut (803) is arranged at the bottom end of the fixing bolt (801).
3. A mechanical vacuum pump with good sealing effect as claimed in claim 2, wherein: the assembling stabilizing structure (8) is symmetrically provided with two groups about the vertical center line of the assembling base (1), the fixing bolts (801) penetrate through the inside of the assembling base (1), and the fixing bolts (801) form an elastic structure with the assembling base (1) through the damping springs (802).
4. A mechanical vacuum pump with good sealing effect as claimed in claim 1, wherein: the compensation structure (9) comprises a compensation liquid tank (901), scale marks (902), sealing steel balls (903), a reset spring (904) and communicating pipes (905), the scale marks (902) are arranged on the outer surface of the compensation liquid tank (901), the sealing steel balls (903) are arranged at the bottom end of the compensation liquid tank (901), the reset spring (904) is connected to the bottom end of each sealing steel ball (903), and the communicating pipes (905) are arranged at the bottom end of each reset spring (904).
5. A mechanical vacuum pump with good sealing effect as claimed in claim 4, wherein: the compensating liquid tank (901) is communicated with the shell (2) through a communicating pipe (905), and an elastic telescopic structure is formed between the sealing steel ball (903) and the return spring (904).
6. A mechanical vacuum pump with good sealing effect as claimed in claim 1, wherein: the sealing structure (12) comprises a connecting bolt (121), a sealing ring groove (122), a sealing ring (123), a sealing sleeve changing (124) and a locking bolt (125), wherein the sealing ring groove (122) is arranged on the inner side of the connecting bolt (121), the sealing ring (123) is arranged in the sealing ring groove (122), the sealing sleeve changing (124) is arranged on the outer side of the connecting bolt (121), and the locking bolt (125) is arranged at two ends of the sealing sleeve changing (124).
7. A mechanical vacuum pump with good sealing effect as claimed in claim 6, wherein: the sealing ring groove (122) is matched with the sealing ring (123), the sealing sleeve (124) is in threaded connection with the locking bolt (125), and the sealing sleeve (124) is sleeved with the exhaust pipe (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011250575.0A CN112377410A (en) | 2020-11-10 | 2020-11-10 | Sealed effectual mechanical vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011250575.0A CN112377410A (en) | 2020-11-10 | 2020-11-10 | Sealed effectual mechanical vacuum pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112377410A true CN112377410A (en) | 2021-02-19 |
Family
ID=74579519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011250575.0A Pending CN112377410A (en) | 2020-11-10 | 2020-11-10 | Sealed effectual mechanical vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112377410A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001066950A1 (en) * | 2000-01-03 | 2001-09-13 | Zigang Jiang | Rotating drum liquid ring vacuum pump/compressor and its using method |
| US20140271316A1 (en) * | 2013-03-13 | 2014-09-18 | Arnold J. Beal | Reducing flow communication between chambers of guided-vane rotary apparatus |
| CN208252350U (en) * | 2018-05-29 | 2018-12-18 | 淄博锐志真空设备有限公司 | A kind of water ring vacuum pump gas-liquid separator of included Wind cooling temperature reducing device |
| CN109162922A (en) * | 2018-09-30 | 2019-01-08 | 黄兴坤 | A kind of vacuum pump convenient for construction and installation |
| US20190136858A1 (en) * | 2015-03-30 | 2019-05-09 | Hicor Technologies, Inc. | Compressor with liquid injection cooling |
| CN208996950U (en) * | 2018-11-08 | 2019-06-18 | 天津利德众诚科技有限公司 | A kind of Wear-resisting water ring vacuum pumps |
| CN209385340U (en) * | 2018-12-18 | 2019-09-13 | 山东新华医疗器械股份有限公司 | Water ring vacuum pump working solution circulating system |
| CN110925206A (en) * | 2019-11-26 | 2020-03-27 | 王煜 | Sealing structure of vacuum pump |
| CN210977870U (en) * | 2019-03-13 | 2020-07-10 | 上海工程技术大学 | Water ring pump device based on water cyclic utilization |
| CN211819973U (en) * | 2020-03-20 | 2020-10-30 | 瑞安市创博机械有限公司 | Centrifugal fan |
-
2020
- 2020-11-10 CN CN202011250575.0A patent/CN112377410A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001066950A1 (en) * | 2000-01-03 | 2001-09-13 | Zigang Jiang | Rotating drum liquid ring vacuum pump/compressor and its using method |
| US20140271316A1 (en) * | 2013-03-13 | 2014-09-18 | Arnold J. Beal | Reducing flow communication between chambers of guided-vane rotary apparatus |
| US20190136858A1 (en) * | 2015-03-30 | 2019-05-09 | Hicor Technologies, Inc. | Compressor with liquid injection cooling |
| CN208252350U (en) * | 2018-05-29 | 2018-12-18 | 淄博锐志真空设备有限公司 | A kind of water ring vacuum pump gas-liquid separator of included Wind cooling temperature reducing device |
| CN109162922A (en) * | 2018-09-30 | 2019-01-08 | 黄兴坤 | A kind of vacuum pump convenient for construction and installation |
| CN208996950U (en) * | 2018-11-08 | 2019-06-18 | 天津利德众诚科技有限公司 | A kind of Wear-resisting water ring vacuum pumps |
| CN209385340U (en) * | 2018-12-18 | 2019-09-13 | 山东新华医疗器械股份有限公司 | Water ring vacuum pump working solution circulating system |
| CN210977870U (en) * | 2019-03-13 | 2020-07-10 | 上海工程技术大学 | Water ring pump device based on water cyclic utilization |
| CN110925206A (en) * | 2019-11-26 | 2020-03-27 | 王煜 | Sealing structure of vacuum pump |
| CN211819973U (en) * | 2020-03-20 | 2020-10-30 | 瑞安市创博机械有限公司 | Centrifugal fan |
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Application publication date: 20210219 |
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| RJ01 | Rejection of invention patent application after publication |