Sealing and cleaning device for plunger of high-pressure homogenizer

Abstract

The utility model relates to a sealing and cleaning device for a plunger of a high-pressure homogenizer. Specifically, two liquid inlet channels are deeply drilled in the bottom, the top or the side face of a transition plate of the high-pressure homogenizer, the channels are communicated with a gap between a plunger and a plunger seal, and a liquid inlet and a liquid outlet and exhaust port are formed in the ends of the channels. An ultrasonic pool of an ultrasonic generator is installed on the liquid inlet, and an ultrasonic vibration knife needle in the ultrasonic pool extends into the liquid inlet. Ultrasonic vibration and cavitation bubbles are generated in water flow under the action of the ultrasonic vibration cutter needle, the plunger and the seal are cleaned by the flowing water, and dirt is discharged. The plunger is lubricated, the service time of a plunger sealing piece is prolonged, and the plunger sealing piece is particularly suitable for sealing and cleaning of an ultrahigh-pressure homogenizer for treating high-viscosity dried materials easy to gel.

Description

Technical Field

[0001] The utility model relates to the field of homogenizer mechanical equipment, in particular to a plunger seal cleaning device for a plunger type high-pressure homogenizer. Background Art

[0002] High-pressure homogenizer is also called "high-pressure fluid nano-homogenizer". It allows non-solvent liquid materials with particle sizes below microns to flow through a special cavity at high speed under high pressure (1000-3000 bar), generating high-pressure shear, cavitation, and impact, so that the materials can be ultra-fine, mixed, and homogenized. It is widely used in the preparation of dispersions in biopharmaceuticals, nano-new materials, new energy, scientific research and other industries. The high-pressure power of the homogenizer is generated by the reciprocating plunger in the high-pressure pump head. When the plunger contracts, negative pressure is generated (the feed valve ball is open and the discharge valve ball is closed). The material is sucked into the pump cavity through the feed check valve. When it opens (the feed valve ball is closed and the discharge valve ball is open), the plunger compresses the material in the pump cavity. At this time, the material in the pump cavity is subject to the gap resistance of the "homogenizing valve" flowing behind it, generating high pressure. The plunger moves outside the high-pressure pump cavity and the normal pressure pump head, and the dynamic seal is maintained by the vulnerable plunger seal, which ensures the ultra-high pressure of the homogenization process. When the plunger seal is damaged or contaminated, the pressure will not be maintained and the material will leak. It is necessary to immediately stop the machine to discharge the material, clean and replace the plunger seal. The material homogenization operation can only be resumed after the new car is processed, and the material and time loss are considerable. The plunger is generally made of smooth and wear-resistant zirconia material with a relatively long service life. In contrast, the seal is made of soft material and is easy to fail. The seal is assembled from high-precision heat-resistant, pressure-resistant, wear-resistant, lubricating, self-tightening, and self-cleaning special super rubber and plastic and special stainless steel parts, such as ultra-high pressure Pansai seals, which are expensive. The cost of replacing the seal of the homogenizer is very high. When processing materials with adhesive, condensed, or hard particles, such as high-viscosity acidic organic functional inks, the seals are particularly easy to damage, so that the homogenizer often needs to be stopped for cleaning and replacement of the seal, reducing efficiency, pollution and wasting materials. Summary of the invention

[0003] In view of the shortcomings of the prior art, the reasons for the failure of the homogenizer seal are analyzed. The main reason is that when the plunger is running, the material or particles gradually scale on the plunger and the seal, causing local wear of the seal and loss of sealing ability. When dealing with materials with strong adhesion or easy to gel and dry, scaling is fast and the seal fails quickly. The solution of the utility model is to clean the seal, but the maintenance of the homogenizer, such as cooling the plunger, is placed near the crankshaft behind the transition plate, and water cannot contact the seal. The utility model provides a high-pressure homogenizer plunger seal cleaning device, a new water inlet is opened on the transition plate to install an ultrasonic tank, and an ultrasonic generator is connected so that the ultrasonic water flow can reach the seal gap to effectively clean the seal. The problem of extending the life of the homogenizer plunger seal, reducing the homogenization cost, and realizing the homogenization of special materials is solved.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-pressure homogenizer plunger seal cleaning device, comprising a homogenizer chassis, a high-pressure pump head, a transition plate, a plunger, a plunger seal and an associated homogenizer valve body, the homogenizer chassis comprises a reciprocating power crankshaft, the high-pressure pump head comprises a one-way valve seat, a valve ball, a feed port, a pump head outlet, and a pressure gauge, and two channel holes reaching the gap between the plunger and the plunger seal are arranged under, on the top surface or on the side of the transition plate, which are a liquid inlet channel and a liquid outlet exhaust channel, respectively, and the diameters of the liquid inlet channel and the liquid outlet exhaust channel are 0.5-8mm; a liquid inlet with a diameter thicker and deeper than the channel is arranged at the upper end of the liquid inlet channel, and a liquid outlet exhaust port with a diameter thicker and deeper than the channel is arranged at the lower end of the liquid outlet exhaust channel; an ultrasonic generator is connected to the liquid inlet.

[0005] The liquid space flow in the channel is: the liquid with ultrasonic wave applied enters from the liquid inlet, reaches the gap between the plunger and the plunger seal through the liquid inlet channel, cleans the plunger and the seal, and discharges the liquid and the generated gas from the liquid outlet through the liquid outlet channel.

[0006] Furthermore, the diameters of the liquid inlet channel and the liquid outlet and exhaust channel are 1.5-4 mm, the diameter of the liquid inlet is 0.5-0.8 times the thickness of the transition plate, and the depth of the liquid inlet is 1-2 times its diameter.

[0007] Furthermore, an ultrasonic generating device is installed on the liquid inlet, and the ultrasonic generating device includes an ultrasonic generator, a high-frequency power supply, an ultrasonic pool, a liquid inlet interface, and an ultrasonic vibration knife needle; the installation of the ultrasonic generating device is achieved by connecting the ultrasonic pool to the liquid inlet; the ultrasonic pool is a bottle-shaped liquid storage container with a liquid inlet interface on the upper part, which is larger at the top and smaller at the bottom, without a cover and a bottom, and has an upper opening without a cover connected to the ultrasonic generator, and a lower opening without a bottom installed on the liquid inlet; the upper part of the ultrasonic generator is connected to the high-frequency power supply, and the lower center is connected to the ultrasonic vibration knife needle; the ultrasonic vibration knife needle is in the middle of the ultrasonic pool, the upper end is connected to the ultrasonic generator, the lower part is inserted into the liquid inlet, and the lower end is as close to the liquid inlet channel as possible, but does not touch the transition plate; the ultrasonic vibration knife needle is columnar in shape, and the port is flat or pointed; the high-frequency power supply is an instrument with an output current of 5-200kHz.

[0008] The ultrasonic vibration needle in the ultrasonic pool is designed to penetrate deep into the liquid inlet channel, so that the liquid flow still maintains a certain ultrasonic intensity when it reaches the gap of the seal. The impact force generated by the bursting of bubbles generated by the ultrasonic wave can also help clean, thus removing more stubborn scale.

[0009] Furthermore, the ultrasonic knife needle is flat in shape, and the port is flat or pointed.

[0010] Furthermore, the high frequency power supply is an instrument with an output current of 15-40kHz.

[0011] Select low-frequency ultrasound to generate more fine bubbles in the incoming liquid, which can effectively clean the seals.

[0012] Furthermore, the liquid inlet interface or the liquid inlet port is connected to a liquid inlet hose, and the liquid outlet and exhaust port is connected to a liquid outlet and exhaust hose through or without the liquid outlet and exhaust interface.

[0013] The hose is convenient for liquid inlet, which can be water or solvent, to which detergent, lubricant, coolant, antifriction agent, film-forming agent, and anti-scaling agent can be added. It can be cleaned at a warm temperature or at a low temperature; these methods can be used alternately for cleaning. It can be cleaned continuously or intermittently.

[0014] Compared with the prior art, this application has the following beneficial effects:

[0015] 1. The high-pressure homogenizer plunger seal cleaning device drills a hole on the transition plate to open a new channel to the seal, so that the liquid outside can contact the seal gap. The liquid flowing through the gap under the pulsating impact of the plunger plays a role in cooling to avoid local overheating and gelling, and keeps the plunger and seal lubricated and clean. Effectively, ultrasonic waves are introduced, and under the action of ultrasonic liquid flow, they can be effectively cleaned. More effectively, the seal can be cleaned by adding agents and adjusting the temperature, which can better extend the life of the seal.

[0016] 2. The high-pressure homogenizer plunger seal cleaning device has an ultrasonic vibration needle designed into the liquid inlet channel, so that the liquid flow still maintains a certain ultrasonic intensity when it reaches the seal gap. Low-frequency ultrasound is selected for vibration cleaning, and its cleaning effect is more in-depth. The impact force generated by the bursting of bubbles generated by ultrasound can also help cleaning, which can remove more stubborn scaling and make up for the blind spots that cannot be cleaned by the liquid flow, so as to achieve more comprehensive and effective seal cleaning and greatly extend the life of the seal.

[0017] 3. The plunger seal cleaning device of the high-pressure homogenizer keeps the plunger and plunger seal in the process of homogenization, and timely dilutes the material seepage on the plunger to ensure the ultra-high pressure homogenization of special materials such as high-viscosity organic dispersions that are easy to gel and dry in the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure and installation of the utility model.

[0019] In the figure: 100 homogenizer chassis, 110 power crankshaft, 200 high-pressure pump head, 210 one-way valve, 220 valve ball, 230 feed port, 240 pump head outlet, 250 pressure gauge, 300 transition plate, 310 liquid inlet channel, 320 liquid outlet channel, 330 liquid inlet, 340 liquid outlet exhaust port, 341 liquid outlet exhaust interface, 342 liquid outlet exhaust hose, 400 plunger, 500 plunger seal, 600 ultrasonic generator, 610 high-frequency power supply instrument, 620 ultrasonic pool, 621 liquid inlet interface, 622 liquid inlet hose, 630 ultrasonic vibration knife needle, 700 homogenizer valve body. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Obviously, the embodiments described are only part of the embodiments of the utility model, and not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Please refer to the attached drawings. A high-pressure homogenizer plunger seal cleaning device in this embodiment includes a homogenizer case 100 (including a reciprocating power crankshaft 110 and a regulating control system), a high-pressure pump head 200 (including two sets of one-way valves 210, two sets of valve balls 220, a feed port 230 and a feed device, a pump head outlet 240, and a pressure gauge 250). There is a transition plate 300 between the homogenizer case 100 and the high-pressure pump head 200, and at least one plunger 400 is connected to the power crankshaft. A plunger seal 500 is provided in the high-pressure pump head 200 through which the plunger passes, and the pump head outlet 240 is connected to a homogenizing valve body 700. For each plunger, two 1.5-4 mm deep holes are drilled below and above the transition plate. The two deep holes should be connected. The upper channel is a liquid inlet channel 310, and the lower channel is a liquid outlet and exhaust channel 320, forming a channel for liquid to reach the gap between the plunger and the seal.

[0022] The upper end hole of the liquid inlet channel 310 is enlarged to a size 0.5-0.8 times that of the transition plate, with a diameter of about 10-20 mm and a depth of 15-30 mm, to form a liquid inlet 330 for installing an ultrasonic generator.

[0023] The ultrasonic generating device comprises a high-frequency power supply 610, and an electric wire is connected to the ultrasonic generator 600. An ultrasonic vibration knife needle 630 is installed at the lower end of the ultrasonic generator 600. The ultrasonic vibration knife needle 630 is in the ultrasonic pool 620. As shown in the figure, the ultrasonic pool 620 is a bottle-shaped liquid storage container with a liquid inlet interface 621 at the top, which is larger at the top and smaller at the bottom, without a cover and a bottom. The ultrasonic generator 600 is connected to the uncovered upper opening, and the ultrasonic vibration knife needle 630 is exposed at the bottomless lower opening.

[0024] The configuration is as follows: the frequency of the ultrasonic high-frequency power supply 610 is 18 Hz, the ultrasonic vibration knife needle 630 is cylindrical in shape with a flat port, and the ultrasonic pool 620 is 100 ml.

[0025] The ultrasonic pool 620 is inserted into the liquid inlet 330 as shown in the figure, and the ultrasonic vibration needle 630 of the ultrasonic pool 620 is exposed, and the lower lower port is close to the liquid inlet channel 310 but does not touch the transition plate 300.

[0026] The liquid inlet interface 621 of the ultrasonic pool 620 is connected to a 1 / 8" liquid inlet hose 622 to supply liquid to the cleaning device, generally water. A liquid outlet exhaust interface 341 is installed on the liquid outlet 340 with a drilling diameter of about 6-8mm and connected to a 1 / 4" water outlet hose to exhaust water from the cleaning device. When the homogenizer has multiple groups of plungers, the water inlet pipes are combined to supply water, and filters for visible impurities are added to each water outlet pipe. When there are few impurities in the pipeline, the pipes can be combined, and when there are many impurities, the pipes are directly discharged.

[0027] The cleaning water inlet temperature is 10-20℃. Generally, a chiller is installed. When processing materials that are prone to thickening, DMAD penetrating film-forming cleaning agent can be added to the cleaning water.

[0028] The working principle of the above embodiment is:

[0029] A hole is drilled on the transition plate to open a channel leading to the seal, and the outside liquid, usually water, can contact the gap of the plunger seal. The water flowing through the gap under the pulsating impact of the plunger plays a cooling role to avoid local overheating and gelling, and keep the plunger and seal lubricated and clean. At the same time, ultrasonic waves are introduced, and the scale is effectively cleaned under the action of ultrasonic water flow. It is more effective to add agents and adjust the temperature to clean the seal, and better extend the life of the seal.

[0030] Specifically, the ultrasonic vibration needle in the ultrasonic pool is designed to penetrate into the liquid inlet channel, so that the water flow still maintains a certain ultrasonic intensity when it reaches the gap of the plunger seal, and selects low-frequency ultrasound to generate more fine bubbles in the incoming water, ensuring effective cleaning of the plunger seal. Another function of ultrasound is to make up for the blind spots that cannot be cleaned by water flow, so as to achieve more comprehensive and effective plunger seal cleaning.

[0031] The following is an operating example using the homogenization of a PEDOT:PSS aqueous dispersion which is relatively difficult to handle, to demonstrate the technical effect of the utility model.

[0032] Comparative example, 40L / hr2000bar ultra-high pressure homogenizer, the plunger is a zirconium oxide plunger, the plunger seal is a special ultra-high pressure Pansai seal column, the homogenized material is also a high viscosity polymer PEDOT:PSS water dispersion liquid, the processing pressure is 1000-1500bar. When the processing liquid volume is 500-1000L, the special ultra-high pressure Pansai seal column needs to be replaced.

[0033] Operation example, as shown in the figure, the high-pressure homogenizer plunger seal cleaning device is used. The high-pressure homogenizer of the comparative example is used as the main body, and two 2mm deep holes are punched on the side and bottom of the transition plate. The liquid inlet is a hole with an opening diameter of 12mm and a depth of 15mm. An ultrasonic pool is inserted at the liquid inlet. The volume of the ultrasonic pool is about 100ml. The high-frequency power supply of the ultrasonic generator is 18kHz40W. The ultrasonic vibration knife needle is a flat tip. The liquid outlet is connected to a 1 / 4" hose, and the liquid inlet is connected to a 1 / 8" hose. It is intermittently flushed with room temperature pure water. The processed material is a high-viscosity polymer PEDOT:PSS aqueous dispersion, which is the same as the comparative example. The plunger seal is a special ultra-high pressure Pansai sealing column, which is the same as the comparative example. The processing pressure is 1000-1500bar, which is the same as the comparative example. After the cleaning device is passed through the water, the temperature of the relevant parts is slightly lower than that of the comparative example. During the flushing process, the outlet water contains large and small bubbles. The air-water pulsation impact can be felt with the movement of the plunger. It can be seen that the material is adhered to the gelled scale fragments and is washed out by the water. Sometimes there may be instantaneous leakage and the seal is regenerated in an instant as the scale is washed out. The processing liquid volume of the special ultra-high pressure Pansai seal that needs to be replaced is greater than 2000L.

[0034] It is obvious from the data of the processed liquid volume when replacing the plunger seal that, compared with the comparative example, the processed liquid volume of the high-viscosity polymer PEDOT:PSS aqueous dispersion liquid using the high-pressure homogenizer plunger seal cleaning device of the utility model is increased by more than 2 times, indicating that the use of the utility model can effectively clean the high-pressure homogenizer seal and extend the life of the plunger seal.

[0035] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various additions, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-pressure homogenizer plunger seal cleaning device, comprising a homogenizer housing (100), a high-pressure pump head (200), a transition plate (300), a plunger (400), a plunger seal (500) and an associated homogenizer valve body (700), wherein the homogenizer housing (100) comprises a reciprocating power crankshaft (110), and the high-pressure pump head (200) comprises a one-way valve seat (210), a valve ball (220), a feed inlet (230), a pump head outlet (240), and a pressure gauge (250), characterized in that Two channel holes are arranged below, on the top or on the side of the transition plate to reach the gap between the plunger (400) and the plunger seal (500), which are respectively a liquid inlet channel (310) and a liquid outlet and exhaust channel (320), and the diameters of the liquid inlet channel (310) and the liquid outlet and exhaust channel (320) are 0.5-8 mm; a liquid inlet (330) having a diameter greater than that of the channel and a greater depth is arranged at the upper end of the liquid inlet channel (310), and a liquid outlet and exhaust port (340) having a diameter greater than that of the channel and a greater depth is arranged at the lower end of the liquid outlet and exhaust channel (320); an ultrasonic generator is connected to the liquid inlet (330).

2. A high pressure homogenizer plunger seal cleaning device according to claim 1, characterized in that The diameters of the liquid inlet channel (310) and the liquid outlet and exhaust channel (320) are 1.5-4 mm, the diameter of the liquid inlet (330) is 0.5-0.8 times the thickness of the transition plate (300), and the depth of the liquid inlet (330) is 1-2 times its diameter.

3. A high pressure homogenizer plunger seal cleaning device according to claim 1, characterized in that: The liquid inlet (330) is installed with an ultrasonic generator, the ultrasonic generator comprising an ultrasonic generator (600), a high-frequency power supply (610), an ultrasonic pool (620), a liquid inlet interface (621), and an ultrasonic vibration knife needle (630); the ultrasonic generator is installed by connecting the ultrasonic pool (620) to the liquid inlet (330); the ultrasonic pool (620) is a bottle-shaped liquid storage container with a liquid inlet interface (621) at the top, which is larger than the top and smaller than the bottom, without a cover or a bottom, and has an upper opening without a cover connected to the ultrasonic generator (600) and a lower opening without a bottom installed on the liquid inlet (330). The ultrasonic generator (600) is connected to a high-frequency power supply (610) at the top and to an ultrasonic vibration knife needle (630) at the bottom center; the ultrasonic vibration knife needle (630) is located in the middle of the ultrasonic pool (620), the upper end of which is connected to the ultrasonic generator (600), and the lower part is inserted into the liquid inlet (330), and the lower end of the lower part is as close to the liquid inlet channel (310) as possible, but does not touch the transition plate (300); the ultrasonic vibration knife needle (630) is cylindrical in shape, and the end is flat or pointed; the high-frequency power supply (610) is an instrument with an output current of 5-200kHz.

4. A high pressure homogenizer plunger seal cleaning device according to claim 3, characterized in that The ultrasonic vibration knife needle (630) is flat in shape, and the end is flat or pointed.

5. A high pressure homogenizer plunger seal cleaning device according to claim 3, characterized in that The high frequency power supply (610) is an instrument with an output current of 15-40kHz.

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