A liquid ring vacuum pump

Abstract

The application belongs to the technical field of vacuum equipment, and particularly relates to a liquid ring vacuum pump, which comprises a pump body, pump covers fixed at two ends of the pump body respectively, discs fixed between the two pump covers and the pump body respectively, rotating shafts penetrating through the two pump covers and the pump body and rotatingly connected with the two pump covers respectively, and impellers fixed on the rotating shafts between the two discs, wherein the pump body, the pump covers, the discs and the impellers are overflow components, the overflow components are molded by graphene thermosetting resin fiber composite material, the graphene thermosetting resin fiber composite material comprises the following components in parts by weight: thermosetting resin 35-45 parts, fiber 55-65 parts, graphene 1-25 parts, divalent acid ester 2-5 parts, anhydrous ethanol 1-5 parts and coupling agent 0.5-2 parts. Static electricity can be introduced into the ground through the impellers, the pump body and the pump covers, so that static electricity accumulation is avoided, the problem that the liquid ring vacuum pump made of non-metallic materials is prone to static electricity accumulation is solved, and the strength and corrosion resistance of the liquid ring vacuum pump can be enhanced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vacuum equipment, and particularly relates to a liquid ring vacuum pump. BACKGROUND

[0002] In the fields of chemical industry and pharmaceutical industry, a liquid ring vacuum pump is often used to pump some flammable and explosive gases, and liquid organic compounds such as ethanol, acetone, liquid alkanes or benzene polymers are used as flow media. In order to avoid corrosion, the liquid ring vacuum pump is made of non-metallic materials.

[0003] During work, static electricity is generated between the pumped gas and the pipeline, and static electricity is also generated between the flow medium and the liquid ring vacuum pump. Static electricity is still a safety killer in the pharmaceutical and chemical industries. Since the liquid ring vacuum pump is made of non-metallic materials and cannot conduct electricity, static electricity is easily accumulated at the liquid ring vacuum pump, and sparks are easily generated when pumping flammable and explosive gases, which can cause explosion accidents. SUMMARY

[0004] The application aims to provide a liquid ring vacuum pump, which can solve the problem of static electricity accumulation caused by non-metallic materials, and can enhance the strength and corrosion resistance of the liquid ring vacuum pump.

[0005] The application is implemented as follows: a liquid ring vacuum pump comprises a pump body, pump covers fixed at both ends of the pump body, discs fixed between the pump covers and the pump body, rotating shafts penetrating through the pump covers and the pump body and rotatably connected with the pump covers, and an impeller fixed on the rotating shaft between the discs. The pump body, the pump covers, the discs and the impeller are overcurrent components, which are molded by graphene thermosetting resin fiber composite material. The graphene thermosetting resin fiber composite material comprises the following components in parts by weight: thermosetting resin 35-45 parts, fiber 55-65 parts, graphene 1-25 parts, divalent acid ester 2-5 parts, anhydrous ethanol 1-5 parts and coupling agent 0.5-2 parts.

[0006] The production method of the graphene thermosetting resin fiber composite material comprises the following steps:

[0007] Step one: the thermosetting resin is put into a reaction kettle for heating to melt the thermosetting resin, then the divalent acid ester is added for stirring, and then the graphene is added, and the mixed material A is obtained after stirring.

[0008] The weight ratio of the thermosetting resin, the divalent acid ester and the graphene is (35-45):(2-5):(1-25).

[0009] Step two, mix the mixed material A, fiber, anhydrous ethanol, coupling agent uniformly to obtain mixed material B;

[0010] The weight ratio of the mixed material A, the fiber, the anhydrous ethanol, and the coupling agent is (39-75):(55-65):(1-5):(0.5-2).

[0011] Step three, after drying the mixed material B, the graphene thermosetting resin fiber composite material is obtained.

[0012] As an improvement, the production method of the flow component includes the following steps:

[0013] Step one, heat and soften the graphene thermosetting resin fiber composite material, and control the temperature at 60-115℃;

[0014] Step two, preheat the mold for mold forming to 110-155℃, and add a release agent in the mold;

[0015] Step three, place the softened graphene thermosetting resin fiber composite material into the mold, close the mold and pressurize, control the pressure at 15-45MPa, and then heat the mold to 165℃-200℃, and keep constant pressure for 1-3 hours;

[0016] Step four, after cooling the mold, reduce the pressure, open the mold, and obtain the semi-finished product of the flow component;

[0017] Step five, machine process the semi-finished product of the flow component.

[0018] As an improvement, after adding the graphene, ultrasonic dispersion is performed.

[0019] As an improvement, the fiber is glass fiber or quartz fiber, and the length of the glass fiber or the quartz fiber is 5-50cm.

[0020] As an improvement, the graphene is graphene filter cake, and the weight percentage of the graphene in the graphene filter cake is 10% to 28%.

[0021] As an improvement, the pump body includes a first cylinder body and a second cylinder body fixedly connected, and a sealing structure is arranged between the abutting ends of the first cylinder body and the second cylinder body; the disc corresponding to the first cylinder body is a first disc, and the first disc and the end of the first cylinder body away from the second cylinder body are fixedly connected as a whole; the disc corresponding to the second cylinder body is a second disc, and the second disc and the end of the second cylinder body away from the first cylinder body are fixedly connected as a whole.

[0022] As an improvement, the impeller comprises a first impeller and a second impeller fixedly installed on the rotating shaft respectively, the first impeller and the second impeller respectively comprise a hub sleeved on the rotating shaft, a mounting plate arranged at one end of the hub, and a plurality of blades arranged at the hub in a circumferential direction, and the plurality of blades are fixedly connected with the mounting plate on a side close to the mounting plate respectively; and the mounting plate of the first impeller and the mounting plate of the second impeller are arranged adjacently.

[0023] As an improvement, a reinforcing hoop is arranged on a side of the plurality of blades away from the mounting plate, and the plurality of blades are fixedly connected with the reinforcing hoop respectively.

[0024] As an improvement, the first impeller and the second impeller are an integral structure formed by die molding.

[0025] As an improvement, a connecting sleeve is arranged between the central holes of the two hubs of the first impeller and the second impeller, and the hubs of the first impeller and the second impeller are fixedly connected with the connecting sleeve respectively.

[0026] With the technical scheme, the liquid ring vacuum pump comprises a pump body, pump covers fixedly arranged at two ends of the pump body respectively, discs fixedly arranged between the pump covers and the pump body respectively, rotating shafts penetrating through the pump covers and the pump body and rotatably connected with the pump covers respectively, and impellers fixedly arranged on the rotating shafts between the discs. The pump body, the pump covers, the discs and the impellers are flow parts, the flow parts are formed by die molding of graphene thermosetting resin fiber composite material, the graphene thermosetting resin fiber composite material comprises the following components in parts by weight: thermosetting resin 35-45 parts, fiber 55-65 parts, graphene 1-25 parts, divalent acid ester 2-5 parts, anhydrous ethanol 1-5 parts and coupling agent 0.5-2 parts. Since the flow parts of the liquid ring vacuum pump, i.e. the pump body, the pump covers, the discs and the impellers are made of graphene thermosetting resin fiber composite material, and the graphene thermosetting resin fiber composite material contains graphene capable of conducting electricity, the frictional static electricity generated between the pumped gas and the pipeline and the frictional static electricity generated between the flow medium and the liquid ring vacuum pump can be conducted to the ground through the impellers, the pump body and the pump covers, so that the static electricity accumulation is avoided, the problem that the liquid ring vacuum pump made of non-metallic material is prone to static electricity accumulation is solved, the strength and corrosion resistance of the liquid ring vacuum pump are enhanced due to the high strength and corrosion resistance of graphene. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a sectional structure schematic diagram of the liquid ring vacuum pump of the embodiment of the present application;

[0028] Wherein, 11, first cylinder; 12, second cylinder; 20, pump cover; 30, disc; 40, rotating shaft; 50a, first impeller; 50b, second impeller; 51, hub; 52, mounting plate; 53, blade; 54, reinforcing hoop; 60, connecting sleeve. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0030] By Figure 1 It can be seen that the liquid ring vacuum pump comprises a pump body, two pump covers 20 fixed at both ends of the pump body respectively, two discs 30 fixed between the two pump covers 20 and the pump body on the corresponding side respectively, a rotating shaft 40 penetrating through the two pump covers 20 and the pump body and rotatingly connected with the two pump covers 20 respectively, and an impeller fixed on the rotating shaft 40 between the two discs 30. Usually, mechanical seals are respectively arranged between the rotating shaft 40 and the two pump covers 20 to prevent leakage. The pump body, the pump cover 20, the disc 30 and the impeller are overcurrent components, which are molded by graphene thermosetting resin fiber composite material. The graphene thermosetting resin fiber composite material comprises the following components by weight: thermosetting resin 35-45 parts, fiber 55-65 parts, graphene 1-25 parts, divalent acid ester 2-5 parts, anhydrous ethanol 1-5 parts and coupling agent 0.5-2 parts. Specifically, the weight parts of each component are thermosetting resin 35 parts, fiber 55 parts, graphene 2 parts, divalent acid ester 1 part, anhydrous ethanol 1 part and coupling agent 0.5 part, or thermosetting resin 45 parts, fiber 65 parts, graphene 25 parts, divalent acid ester 5 parts, anhydrous ethanol 5 parts and coupling agent 2 parts. Preferably, the weight parts of each component are thermosetting resin 43 parts, fiber 60 parts, graphene 10 parts, divalent acid ester 3 parts, anhydrous ethanol 4 parts and coupling agent 1.5 parts.

[0031] The production method of the graphene thermosetting resin fiber composite material comprises the following steps:

[0032] Step one, heat the thermosetting resin to 50°C, add divalent acid ester and stir. Usually, the stirring time is 30 minutes, and the specific stirring time increases with the total amount of thermosetting resin, so as to facilitate the uniform mixing of the two. For example, when the amount of thermosetting resin is 45 parts, the stirring time is 50 minutes. After adding graphene, the mixed material A is obtained by stirring. The divalent acid ester can accelerate the dispersion of graphene, so that the graphene is uniformly mixed with the thermosetting resin and the divalent acid ester. The weight ratio of thermosetting resin, divalent acid ester and graphene is (35-45):(2-5):(1-25). Specifically, the weight ratio of thermosetting resin, divalent acid ester and graphene is 43:3:10.

[0033] Generally, the graphene is graphene filter cake, the weight percentage of graphene in the graphene filter cake is 10% to 28%, specifically, the graphene filter cake with a weight percentage of 15% is selected, of course, the graphene can also be graphene solution.

[0034] In order to accelerate the dispersion of graphene, after the graphene is added and stirred, ultrasonic dispersion is carried out.

[0035] Generally, the thermosetting resin is heated in a reaction kettle, and the commonly used thermosetting resins include modified phenolic resin, modified epoxy resin and modified epoxy phenolic resin, which are used to enhance the toughness and corrosion resistance of the graphene thermosetting resin fiber composite material and facilitate mechanical processing.

[0036] Step two, uniformly mix the mixed material A, fiber, anhydrous ethanol and coupling agent to obtain mixed material B, wherein the weight ratio of the mixed material A, fiber, anhydrous ethanol and coupling agent is (39-75):(55-65):(1-5):(0.5-2), specifically, the weight ratio of the mixed material A, fiber, anhydrous ethanol and coupling agent is 56:60:4:1.5.

[0037] The commonly used fibers are glass fibers and quartz fibers, preferably, the length of the fiber is 5-50CM, the fiber with small length has high flowability and low strength, which is suitable for producing small parts, and the fiber with large length has low flowability and high strength, which is suitable for producing large parts. The commonly used coupling agents include chromium complex coupling agent, silane coupling agent and titanate coupling agent.

[0038] Step three, drying the mixed material B to obtain the graphene thermosetting resin fiber composite material, specifically, the mixed material B is placed in an oven for drying.

[0039] Since the over-flowing parts of the liquid ring vacuum pump, including the pump body, the pump cover 20, the disc 30 and the impeller, are made of the graphene thermosetting resin fiber composite material containing graphene capable of conducting electricity, the friction static electricity generated between the pumped gas and the pipeline and the friction static electricity generated between the flow medium and the liquid ring vacuum pump can be conducted to the ground through the impeller, the pump body and the pump cover 20, thereby avoiding the accumulation of static electricity. The over-flowing parts of the liquid ring vacuum pump in the embodiment of the application are made of the graphene thermosetting resin fiber composite material containing graphene, which has good electrical conductivity, thereby solving the problem of easy accumulation of static electricity in the liquid ring vacuum pump made of non-metallic materials. In addition, graphene has high strength and high corrosion resistance, which can enhance the strength and corrosion resistance of the liquid ring vacuum pump.

[0040] In the embodiment of the application, in order to facilitate processing and production, the production method of the over-flowing part includes the following steps:

[0041] Step one, heat the graphene thermosetting resin fiber composite material to soften, the temperature control in 60-115℃, usually, the temperature is 80℃, convenient for graphene thermosetting resin fiber composite material to soften quickly, and won't cause thermosetting material curing because of temperature is too high, specifically, is the graphene thermosetting resin fiber composite material will be put into the oven to soften.

[0042] Step two, the mold press mold for mold pressing is preheated to 110-170℃, usually, preheated to 155℃, and add release agent in the mold press mold, the commonly used release agent has siloxane compound, silicone oil, silicone resin methyl branched silicone oil, polytetrafluoroethylene, fluororesin powder, fluororesin coating, etc.;If the temperature is too high, will cause the graphene thermosetting resin fiber composite material to solidify quickly, need to speed up the speed of mold pressing, avoid appear curing before mold pressing is completed.

[0043] Step three, the softened graphene thermosetting resin fiber composite material is added to the mold press mold, the mold is closed and pressurized, the pressure is controlled in 15-45MPa, then the mold press mold is heated to 165℃-200℃, and the pressure is kept for 1-3 hours, usually, the pressure is 30MPa, the temperature is 180℃, and the time is 2.3 hours, the control of pressure and the control of holding time are related to the thickness of the parts, the thicker the thickness of the parts, the greater the pressure required, and the longer the holding time.

[0044] Step four, after the mold press mold is cooled, the mold is opened after decompression to obtain the semi-finished product of the flow part;

[0045] Step five, machine processing the semi-finished product of the flow part, thus the final product.

[0046] The flow part of the liquid ring vacuum pump is molded by the mold press mold, which can reduce the processing difficulty and improve the production efficiency.

[0047] In order to make each part of the overcurrent component be formed by the die pressing mold, the pump body comprises the first cylinder 11 and the second cylinder 12 fixedly connected together, and a sealing structure, such as a sealing ring, sealing glue or the like, is arranged between the abutting ends of the first cylinder 11 and the second cylinder 12; the disc 30 corresponding to the first cylinder 11 is a first disc, which is fixedly connected with the one end of the first cylinder 11 away from the second cylinder 12 as a whole; and the disc 30 corresponding to the second cylinder 12 is a second disc, which is fixedly connected with the one end of the second cylinder 12 away from the first cylinder 11 as a whole. The pump body is arranged in a split structure, and the first disc and the first cylinder 11 are connected as an integral structure, and the second disc and the second cylinder 12 are connected as an integral structure, so that the die pressing forming is facilitated, and the sealing connection performance between the pump cover 20, the disc and the pump body is enhanced. The sealing connection between the pump cover 20 and the disc and the sealing connection between the disc and the pump body in the prior art is changed into the sealing connection only between the pump cover 20 and the disc, so that the sealing surface is reduced, and the sealing connection performance is enhanced.

[0048] In the embodiment of the application, in order to facilitate the die pressing forming of the impeller, the impeller comprises a first impeller 50a and a second impeller 50b fixedly installed on the rotating shaft 40 respectively, the first impeller 50a and the second impeller 50b each comprise a hub 51 sleeved on the rotating shaft 40, an installation plate 52 arranged at one end of the hub 51, and a plurality of blades 53 arranged at intervals along the circumference of the hub 51, and the plurality of blades 53 are fixedly connected with the installation plate 52 on the side close to the installation plate 52; the installation plate 52 of the first impeller 50a and the installation plate 52 of the second impeller 50b are arranged in abutment. The thickness of the blade 53 is 5-20 mm, and there are usually 15 blades, and of course, the number of blades 53 can be set to other numbers according to the size of the liquid ring vacuum pump.

[0049] Specifically, in order to improve the strength of the first impeller 50a and the second impeller 50b, a reinforcing hoop 54 is arranged on the side of the plurality of blades 53 of the first impeller 50a and the second impeller 50b away from the installation plate 52, and the plurality of blades 53 are fixedly connected with the reinforcing hoop 54.

[0050] The impeller is arranged in a split structure, comprising a first impeller 50a and a second impeller 50b, which are an integral structure formed by die pressing, so as to avoid the die pressing failure caused by the complex overall structure of the impeller.

[0051] Usually, the hub 51 is arranged in a columnar shape, the outer diameter of the first end of the hub 51 is smaller than the outer diameter of the second end of the hub 51, the installation plate 52 is arranged on the outer circumferential side of the second end of the hub 51, and the hub 51, the installation plate 52 and the plurality of blades 53 are an integral structure formed by a die pressing mold.

[0052] In order to facilitate the installation of the first impeller 50a and the second impeller 50b, and align the blades 53 of the first impeller 50a with the blades 53 of the second impeller 50b, a connecting sleeve 60 is arranged between the central holes of the hubs 51 of the first impeller 50a and the second impeller 50b, and the hubs 51 of the first impeller 50a and the second impeller 50b are fixedly connected with the connecting sleeve 60.

[0053] The above description is merely preferred embodiments of the present application, but not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall fall within the scope of the present application.

Claims

1. A liquid ring vacuum pump, comprising a pump body, pump covers respectively fixed at both ends of the pump body, discs respectively fixed between the two pump covers and the pump body, a rotating shaft passing through the two pump covers and the pump body and rotatably connected to the two pump covers respectively, and an impeller fixed on the rotating shaft between the two discs, characterized in that, The pump body includes a first cylinder and a second cylinder fixedly connected. A sealing structure is provided between the adjacent ends of the first cylinder and the second cylinder. The disc corresponding to the first cylinder is a first disc, which is fixedly connected to the end of the first cylinder away from the second cylinder. The disc corresponding to the second cylinder is a second disc, which is fixedly connected to the end of the second cylinder away from the first cylinder. The pump body, the pump cover, the disc, and the impeller are flow-through components. The flow-through components are molded from graphene thermosetting resin fiber composite material. The graphene thermosetting resin fiber composite material includes the following components in parts by weight: 35-45 parts thermosetting resin, 55-65 parts fiber, 1-25 parts graphene, 2-5 parts divalent ester, 1-5 parts anhydrous ethanol, and 0.5-2 parts coupling agent. The production method of the graphene thermosetting resin fiber composite material includes the following steps: Step 1: Place the thermosetting resin into a reaction vessel and heat it to melt the thermosetting resin. Then add the divalent ester and stir. Then add graphene and stir to obtain mixed material A. The weight ratio of the thermosetting resin, the divalent ester, and the graphene is (35-45):(2-5):(1-25). Step 2: Mix the aforementioned mixed material A, fiber, anhydrous ethanol, and coupling agent evenly to obtain mixed material B; The weight ratio of the mixed material A, the fiber, the anhydrous ethanol, and the coupling agent is (39-75):(55-65):(1-5):(0.5-2). Step 3: After drying the mixed material B, the graphene thermosetting resin fiber composite material is obtained.

2. The liquid ring vacuum pump according to claim 1, characterized in that, The method for manufacturing the current-flow component includes the following steps: Step 1: Heat and soften the graphene thermosetting resin fiber composite material, controlling the temperature at 60-115℃; Step 2: Preheat the molding die to 110-170°C and add a release agent into the molding die; Step 3: Place the softened graphene thermosetting resin fiber composite material into the molding die, close the die and apply pressure to control the pressure at 15-45 MPa, then heat the molding die to 165℃-200℃ and keep it under constant pressure for 1-3 hours. Step 4: After cooling the molding die, depressurize it and open the die to obtain the semi-finished product of the flow-through component; Step 5: Machining the semi-finished product of the flow-through component.

3. The liquid ring vacuum pump according to claim 1, characterized in that, After adding the graphene and stirring, ultrasonic dispersion is then performed.

4. The liquid ring vacuum pump according to claim 1, characterized in that, The fiber is glass fiber or quartz fiber, and the length of the glass fiber or the quartz fiber is 5-50 cm.

5. The liquid ring vacuum pump according to claim 1, characterized in that, The graphene is a graphene filter cake, and the weight percentage of the graphene in the graphene filter cake is 10% to 28%.

6. The liquid ring vacuum pump according to claim 1, characterized in that, The impeller includes a first impeller and a second impeller, which are respectively fixedly mounted on the rotating shaft. The first impeller and the second impeller each include a hub fitted on the rotating shaft, a mounting plate disposed at one end of the hub, and multiple blades spaced apart circumferentially along the hub. The side of each blade closest to the mounting plate is fixedly connected to the mounting plate. The mounting plate of the first impeller and the mounting plate of the second impeller are arranged adjacent to each other.

7. The liquid ring vacuum pump according to claim 6, characterized in that, A reinforcing hoop is provided on the side of the multiple blades away from the mounting plate, and the multiple blades are respectively fixedly connected to the reinforcing hoop.

8. The liquid ring vacuum pump according to claim 7, characterized in that, The first impeller and the second impeller are integral structures formed by molding.

9. The liquid ring vacuum pump according to claim 6, characterized in that, A connecting sleeve is provided between the center holes of the two hubs of the first impeller and the second impeller, and the hubs of the first impeller and the second impeller are respectively fixedly connected to the connecting sleeve.

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