Lubricating grease blending kettle

Abstract

A lubricating grease blending kettle comprises a tank cover, a barrel, a first feeding port, a second feeding port, a discharging port, a stirrer, an electric heating device, a base, a pre-mixing device, a discharging pipeline and a gas circulating device, the electric heating device comprises an electric heater and an electric heating pipeline, the electric heating pipeline comprises a vertical section and an annular section, the pre-mixing device wraps the vertical section, and the annular section is connected with the pre-mixing device. The premixing device is arranged in the middle of the vertical section and exchanges heat with the vertical section, the discharging pipeline wraps the vertical section, the gas circulation device is connected to the rear portion of the premixing device, the first feeding port and the second feeding port are both inserted into the premixing device, and the gas circulation device completes extraction of gas at an outlet of the discharging pipeline through obtained kinetic energy so as to reduce the pressure intensity at the outlet. And the extracted gas is input into the premixing device so as to increase the pressure in the device. Through cooperative use of the premixing device and the electric heating pipeline, the stirring efficiency in the blending process is improved, and low-efficiency heat energy is fully utilized.

Description

Technical Field

[0001] The invention relates to the field of grease production equipment, in particular to a grease blending kettle. Background Art

[0002] The grease blending kettle has the function of containing base oil and additives, mixing them evenly and then discharging them. It is generally used in the blending process of grease preparation.

[0003] Existing grease blending kettles can be divided into four types according to the way they mix base oil and additives, namely mechanical stirring type, blending pump circulation type, pulse pneumatic stirring type and pipeline type. The first three methods use the equipment in the blending kettle to stir so that the base oil and additives are evenly mixed, while the pipeline type is to blend directly through the pipeline. Because the construction cost of pipeline equipment is relatively high, the first three methods are more common. The present invention uses the most common mechanical stirring grease blending kettle.

[0004] As a chemical equipment, the grease blending kettle is generally arranged outdoors. However, the outdoor temperature is unstable and is easily lower than the temperature required for the blending reaction. In such weather, it is difficult to fully mix the base oil and additives by stirring with a stirrer alone. For example, in patent CN104277892A, a butter grease is prepared by mixing the base oil and additives through a mechanically stirred grease blending kettle. Although the blending process only requires 20 to 28°C, the above problems will still be faced when the blending kettle is operated outdoors. Generally, similar equipment will be placed in an electric heating pipe, such as in the paper [1] Zhao Jincheng. Application of calcium carbonate in lubricating materials and process design of pilot plant [D]. Guangxi University, 2019., two BDR52-30 explosion-proof heaters with a rated power of 30kw are used to heat the base oil and additives in the blending kettle, and then the blending is completed by stirring. However, the annular part where the electric heating pipe contacts the mixed liquid has the main heating effect, while the heat energy emitted by a section of the vertical heating pipe extending from the electric heater on the tank cover to the annular part is not directly transferred to the mixed liquid, but only causes the surrounding air to heat up. However, the density of the gas with a higher temperature will be smaller and thus float up, and it cannot effectively contact the mixed liquid in the cylinder to complete the heat exchange. Therefore, the heat energy released by the vertical section of the pipe is inefficient. At the same time, as an electric heating device, the end of the electric heating pipe will also accelerate aging due to various stresses, shortening the maintenance cycle of the blending kettle, and thus reducing the production efficiency of the grease. Moreover, it takes time for the mixed liquid to heat up. The longer this period of time, the more serious the above problems will be; if this period of time is saved, after the base oil is added, stirring and adding additives will start immediately, then the mixing of the base oil and the additive will obviously be affected by the temperature and uneven, which will not only increase the working time of the agitator, but also the stirring efficiency is not high, thus affecting the blending efficiency.

[0005] Therefore, a grease blending kettle is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a grease blending kettle to solve the problems of low thermal energy utilization efficiency of electric heating pipelines and too low blending efficiency during the feeding process. Through the use of a pre-mixing device in conjunction with the electric heating pipeline, the blending efficiency is improved while the service life of the electric heating pipeline is extended and the inefficient heat energy generated by the electric heating pipeline is utilized, thereby ensuring the production efficiency of the grease.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A grease blending kettle comprises a tank cover, a cylinder, a first feed port, a second feed port, a discharge port, a stirrer, an electric heating device, a base, a premixing device, a discharge pipe, and a gas circulation device. The electric heating device comprises an electric heater and an electric heating pipe. Two electric heaters are respectively connected to the top of the tank cover and the bottom of the cylinder. The electric heating pipe comprises a vertical section and an annular section. The upper end of the vertical section is inserted into the electric heater on the tank cover, and the end of the annular section is inserted into the electric heater at the bottom of the cylinder. The premixing device is wrapped around the vertical section and exchanges heat with the vertical section. The discharge pipe is inserted below the premixing device and wraps the vertical section. The gas circulation device is connected to the rear of the premixing device. The ends of the first feed port and the second feed port are both inserted into the premixing device.

[0009] The base oil discharged from the feed port converts its potential energy into kinetic energy of the gas circulation device. The gas circulation device uses the obtained kinetic energy to extract the gas at the outlet of the discharge pipe to reduce the pressure at the outlet, and inputs the extracted gas into the premixing device to increase the pressure inside the device.

[0010] The arrangement of the base oil and additive feed ports determines whether they intersect and how they intersect in the process of falling to the bottom of the cylinder. For example, the base oil feed port is set vertically, the additive feed port is set horizontally, and the former is above the latter. This arrangement is to make the path of the base oil fall coincide with the vertical falling path of the additive after a parabolic path, regardless of the effect of the additive feed rate on this coincidence. Even if there is a coincidence, since the additive is far less than the base oil and the base oil feed rate is often faster, when the two liquid columns intersect, the base oil liquid column should disperse the additive liquid column instead of mixing as expected.

[0011] Preferably, the central axis of the feed port 1 is inclined, with an angle of α with the horizontal plane, and 60°≤α≤70°, the central axis of the feed port 2 is horizontal, and coplanar with the central axis of the feed port 1, the height difference between the lowest projection point of the feed port 1 on the central axis and the central axis of the feed port 2 is h, and h is 0.08 to 0.10 of the diameter of the circular contour inside the tank cover.

[0012] The central axes of the first and second feed ports are coplanar, so that the discharged base oil and additives can fall in the same area. The left and right positions of the base oil falling point can be adjusted by adjusting α, and the smaller α is, the closer the falling point is to the left; the left and right positions of the additive falling point can be adjusted by adjusting h, and the larger h is, the closer the falling point is to the right. Furthermore, by adjusting the falling point of the additive on the first inclined plane to be below the falling point of the base oil, the two will not be separated by the collision of the liquid column, but the additive will contact and mix with the base oil in a large area during the process of sliding down the inclined plane after the base oil falls.

[0013] If α is too large, the slope β of the first inclined surface will be too small, thereby affecting the mixing of the base oil and the additive; if α is too small, the base oil will have too much horizontal displacement when falling from the feed port, making it difficult to effectively contact the impeller, which is not conducive to the operation of the gas circulation device and affects the blending efficiency.

[0014] For different can covers, the diameter of the internal circular contour is not fixed, but the central angles corresponding to these circular contours are mostly around 90°. In addition, due to the installation of the agitator, the feed port is generally not installed in the area corresponding to the central angle of 30°, so the installation position of the feed port has a range, and therefore the height difference h cannot be too large; in addition, within this range, the horizontal distance difference corresponding to h at different positions is almost the same, so h cannot be too small, in order to prevent the feed port one and the feed port two from being too close, causing the base oil liquid column and the additive liquid column to collide, affecting the blending efficiency.

[0015] Through the special design of the base oil and additive feed port channels, the base oil and additives can be spread in the same direction without affecting the original feeding function of the feed port, providing conditions for the uniform mixing of the two.

[0016] Preferably, the internal channel of the feed port one comprises a front section one, a middle section one, and a rear section one, the cross-sectional shape of the front section one is a circle of equal diameter, the starting section is on the outer end face of the feed port one, and the ending section is inside the feed port one, the cross-sectional shape of the middle section one is the circular surface at the end of the front section one gradually transitioning to a rectangle, and the ending section is inside the feed port one, the cross-sectional shape of the rear section one is the rectangle at the end of the middle section one transitioning to another rectangle, and the ending section is arranged on the inner end face of the feed port one, and the rectangle on the ending section of the rear section one is equal in width and longer in length than the rectangle on the ending section of the middle section one.

[0017] The structure of the internal channel of the feed port 2 is similar to that of the feed port 1, including a front section 2, a middle section 2, and a rear section 2. A pressure flow surface is provided above the rear section 2, and the pressure flow surface is an inclined surface.

[0018] The structure of the feed port 1 is basically the same as that of the feed port 2. Only the feed port 2 with more features will be described below. The front section 2 is a cylindrical channel to ensure the versatility of connection with the outside. The middle section 2 has a buffering effect on the additives in the pipeline, so that the additives gradually transition from the large cross-section of the front section 2 to the smaller rectangular cross-section, providing conditions for the additives to smoothly enter the rear section 2. The rear section 2 has the function of stabilizing and guiding the additives. On the one hand, the turning between the middle section 2 and the rear section 2 will cause the additives in the middle section 2 to be squeezed when entering the rear section 2 to form turbulence, and there is no turning inside the rear section 2, which can make the additives gradually stabilize during the flow process; on the other hand, the front and rear surfaces of the rear section 2 are inclined surfaces, which can guide the additives to expand in this direction. In addition, as a difference from the feed port 1, the top of the rear section 2 is also an inclined surface, the purpose is to give the discharged additives an initial downward velocity, in order to prevent the injection distance in the horizontal direction from being too far when the additive feeding speed is too large, colliding with the base oil column, and failing to fall normally to the first inclined surface to complete mixing, thereby affecting the blending efficiency.

[0019] After the base oil and additives discharged from the feed port 1 and the feed port 2 are spread out in the same direction, it is difficult to produce sufficient mixing in the air. They can be allowed to fall on a plane and be better mixed through large-area contact.

[0020] Preferably, the premixing device comprises a first cavity, a second cavity, and a connecting pipe, wherein the first cavity comprises a first inclined surface and a second inclined surface, wherein the first inclined surface is on the left side of the first cavity, is hollow inside, and has an angle β with the horizontal plane, and 15°≤β≤90°-α. A protrusion is provided on the first inclined surface, and the protrusion is elliptical, the second cavity is arranged below the first cavity, and the connecting pipe is sleeved on the upright section and passes through the first cavity and the second cavity.

[0021] The angle β between the first inclined plane and the horizontal plane is generally not less than 15°. A too small inclination will affect the guiding effect of the inclined plane on the base oil and additive mixture, thereby reducing the discharge efficiency of the mixture, causing the blockage of the pre-mixing device, and affecting production efficiency; while β is greater than α, the discharged base oil will splash downward when it falls on the first inclined plane, thereby reducing the contact with the additive and affecting the mixing quality. The elliptical protrusion can make the base oil and additive spread out on the first inclined plane over a larger area, thereby making the mixing more complete.

[0022] The mixed liquid of base oil and additive flows down along the first inclined surface, and this process should be ensured to be smooth, so as to speed up the discharge of the mixed liquid and prevent too much mixed liquid from accumulating in the first cavity and interfering with subsequent mixing.

[0023] Preferably, the second slope is on the right side of the first cavity, the second slope is solid inside, and the angle between it and the horizontal plane is γ, 45°≤γ≤65°, and the sum of β and γ should be less than 90°, and the bottom end of the second slope is lower than the bottom end of the first slope.

[0024] The second slope is solid inside to make it more tightly connected with the first cavity, because its volume is not large, so it does not need to be lightweight. The volume of the first cavity is limited. If γ is less than 45°, the projection area of ​​the second slope on the horizontal plane will be too large, which will cause the projection area of ​​the first slope on the horizontal plane to be too small, which means that β is too large, which will affect the mixing quality of the base oil and additives. The sum of β and γ is less than 90°, which makes the angle between the first slope and the second slope an obtuse angle, which can effectively avoid this situation; if γ is greater than 65°, the mixed liquid flowing from the first slope to the second slope will be splashed back to the first slope, which is not conducive to the rapid discharge of the mixed liquid from the first cavity after sufficient mixing, thereby affecting the blending efficiency. In addition, by speeding up the discharge of liquid to improve the blending efficiency, the bottom end of the second slope is lower than the bottom end of the first slope, which can prevent the liquid on the second slope from flowing to the first slope during the downstream process, thereby ensuring that the liquid has a consistent path during the downstream process from the second slope, and there will be no mutual obstruction between multiple paths.

[0025] The premixing device wraps the upright section, and space needs to be reserved to facilitate the insertion of the upright section.

[0026] Preferably, the internal channel of the connecting pipe includes a conical channel and a cylindrical channel. The two conical channels are respectively arranged at both ends of the connecting pipe, and the outlet ends are respectively inside the first cavity and the cylinder. The cylindrical channel connects the two conical channels, and the inner diameter is 0.5 to 1 mm larger than the diameter of the electric heating pipe.

[0027] The conical channel mainly plays two roles. On the one hand, it guides the insertion of the electric heating pipe, and on the other hand, it facilitates the circulation of gas to ensure the normal rotation of the impeller. The end of the electric heating pipe will frequently expand and contract due to heat, which will cause the mechanical stress generated when connected to the electric heater to change frequently, thus causing damage. In the present invention, the upright section is inserted into the connecting pipe through the conical channel so that it is in the low temperature environment of the premixing device. During the feeding process, this low temperature continuously exchanges heat with the upright section to form a cooling protection. Moreover, the present invention accelerates the heating process of the base oil and additive mixture by utilizing the inefficient thermal energy of the electric heating pipe, thereby reducing the heating time of the electric heating pipe in each blending, thereby enabling it to complete the processing of more grease within its service life, thereby improving production efficiency.

[0028] The gas circulation device can smoothly discharge the mixed liquid by pumping and exhausting air under the drive of the impeller, but the air pressure in the premixing device will continue to increase as the process proceeds. When the threshold is reached, the gas can no longer be discharged, and the impeller can no longer rotate. At this time, the potential energy of the base oil will give the impeller a strong impact, which is easy to cause structural damage. There is a gap of 0.5 to 1 mm between the cylindrical channel and the electric heating pipe, which can slowly discharge the gas in the premixing device into the cylinder, thereby avoiding the above situation. At the same time, the conical channel of the first cavity can guide the airflow so that the gas quickly enters the connecting pipe; and the conical channel in the cylinder can delay the discharge of the gas in the connecting pipe, so that the pressure in the first cavity is not too high and not too low, so that the gas circulation device can work normally to ensure the efficiency of blending.

[0029] After the base oil and the additive are fully mixed in the first cavity, they need to be discharged from the premixing device and heated by the vertical section. Before this, the mixed liquid discharged from the first cavity should be gathered together.

[0030] Preferably, the second cavity includes a third inclined plane, a fourth inclined plane, a fifth inclined plane, a sixth inclined plane, and a discharge hole. The third inclined plane and the fourth inclined plane are symmetrically arranged on the left and right sides of the second cavity, with an angle of δ with the horizontal plane, and 15°≤δ≤0.5γ. The fifth inclined plane and the sixth inclined plane are symmetrically arranged on the front and back sides of the second cavity, with an angle of ε with the horizontal plane, and ε is half of δ. The discharge hole is located at the center of the intersection of the four inclined planes.

[0031] If δ is less than 15°, the guiding effect of the third and fourth slopes on the mixed liquid will be affected; if δ is greater than 0.5γ, the mixed liquid will take too long to fall from the second slope to the fourth slope, and more air will be mixed in, which is not conducive to the quality of mixing. In addition, the landing point on the fourth slope is too close to the discharge hole, and the lack of the slope buffer will have a greater impact on the mixed liquid in the second cavity. In addition, the slope buffer also helps to further mix the mixed liquid to a certain extent.

[0032] The falling direction of the mixed liquid determines that it mainly flows through the fourth slope, so the drainage effect of the fourth slope should be ensured as much as possible. If the slopes of the fifth and sixth slopes are too large, the areas of the third and fourth slopes will be reduced, so that more liquid will flow to the fifth and sixth slopes, which will have an adverse effect on the liquid falling efficiency and thus affect the blending efficiency. The value of δ will not be very large. For the convenience of value selection, ε can be half of δ. Of course, the value of ε can be smaller without affecting the diversion effect.

[0033] After being discharged from the premixing device, the mixed liquid of the base oil and the additive needs to enter a pipeline, and the pipeline is heated by inefficient heat energy, thereby achieving heating of the mixed liquid in the pipeline.

[0034] Preferably, the discharge pipe comprises a connecting section, a spiral section and a discharge section, the connecting section is inserted into the discharge hole, and the spiral section is arranged below the connecting section and is sleeved on the electric heating pipe.

[0035] The pitch of the spiral section increases from small to large from top to bottom, and the cross-sectional diameter decreases from large to small. The central axis of the discharge section is vertical, and the cross-sectional diameter decreases gradually from top to bottom.

[0036] The mixed liquid obtains more heat in the spiral section with a smaller pitch, making the mixing more delicate and uniform. The mixed liquid obtains a greater falling speed in the spiral section with a larger pitch, thereby forming a pressure difference between the upper and lower parts for better discharge. The design of the discharge section is similar. In this way, not only does a more delicate and uniform mixing help improve the blending quality, but better discharge also improves the blending efficiency.

[0037] In order to ensure that the premixing device is not blocked during use, the discharge process after the base oil and the additive are fully mixed should be accelerated.

[0038] Preferably, the gas circulation device includes a main shaft, bearings, impellers, cams, pistons, compression springs, a pump body, an exhaust pipe, and the main shaft frame is between the first inclined surface and the discharge port 1, and the middle axis is to the right of the outlet of the feed port 1, the two bearings are respectively nested at both ends of the main shaft, the impeller is sleeved on the main shaft, the cam is sleeved on the main shaft and behind the first cavity, the piston is below the cam, the compression spring is sleeved on the piston, the pump body wraps the piston and is connected to the outer wall of the first cavity, one end of the exhaust pipe is inserted into the pump body, and the other end is placed at the outlet of the discharge section, one end of the exhaust pipe is inserted into the pump body, and the other end is inserted into the first cavity.

[0039] The base oil is discharged from the feed port and falls on the impeller, thereby converting the potential energy of the base oil into the kinetic energy of the impeller. In the limited space of the first cavity, the center axis of the main shaft is set to the right of the outlet of the discharge port. On the one hand, the area of ​​the blades on the impeller is increased as much as possible to contact more with the base oil, thereby obtaining greater kinetic energy, so that the gas circulation device can achieve a stronger pressurization effect on the first cavity. The high pressure not only makes the base oil and additives in the first cavity mix more evenly, but also makes them discharged faster after mixing, thereby improving the quality and efficiency of blending;

[0040] On the other hand, when the impeller has a sufficient volume, a larger adjustment space can be left for the first inclined surface, that is, the adjustment of β is more flexible, so that the first inclined surface can better cooperate with the first and second inclined surfaces of the feed port. The benefits brought by the good cooperation between them have been demonstrated above. In short, it can also provide great help to improve the blending efficiency.

[0041] While the base oil drives the impeller to rotate, the additives discharged from the feed port will cause resistance to the rotation of the impeller. It can be seen that there are many designs that can reduce this resistance, for example, the two end faces of the blade are connected, and a thin plate is hinged inside the penetration, and the thin plate can only be opened in a specified direction. When it contacts the additive, the thin plate will open under its own gravity and the impact of the additive, allowing the additive to flow through the blade; when it contacts the base oil, the thin plate will close under its own gravity and the impact of the base oil, allowing the base oil to contact the blade over a large area. Compared with this solution, although the above solution can solve the problem, it also brings considerable hidden dangers. The hinged thin sheet rotates with the impeller, but it is not fixed itself, so the center of mass of the impeller will change with its position, and it is difficult to ensure the stability of the operation process.

[0042] Preferably, the impeller includes a hub and blades, the hub is sleeved on the main shaft, the blades include a sheet body, a convex body, and a conical hole, four sheets are evenly connected to the hub along the radial direction, and the convex body is formed by extending outward from the end surface of the sheet body.

[0043] The tapered hole passes through the sheet body and the convex body, with the small diameter end on the sheet body and the large diameter end on the convex body.

[0044] During the rotation of the blades, the convex body contacts the additive, and the resistance caused by the additive is reduced by its own taper. The blade normally contacts the base oil, completing the conversion of potential energy and kinetic energy. The tapered hole makes it easier for the additive to flow through the blade when it contacts the convex body, and correspondingly, the base oil flows through the blade as little as possible when it contacts the blade. In this way, while the impeller obtains kinetic energy, the resistance it encounters is greatly reduced, making the operation of the gas circulation device smoother and the blending efficiency higher.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] 1. Although the existing grease blending kettle is equipped with an electric heater, its thermal energy utilization efficiency is not high. During the feeding process, it takes time to heat up the base oil and additives. During this period of time, the vertical section has been releasing inefficient heat energy, which not only has a weak effect on the blending process, but its own continuous dry burning will also affect the service life, thereby affecting the production efficiency of the grease. Moreover, since the temperature required for mixing has not yet been reached, the operation of the agitator is not only inefficient, but also causes unnecessary energy loss, which is not conducive to improving the blending efficiency. In order to solve these problems, the base oil and additives are mixed during the feeding process through a pre-mixing device, and the inefficient heat energy of the electric heating pipe is used to heat the mixed liquid. At the same time, the potential energy of the base oil discharged from the feed port is used to drive the gas circulation device, so that the discharge process of the mixed liquid in the pre-mixing device is smoother, so that the blending efficiency and production efficiency of the grease are comprehensively improved.

[0047] 2. The continuous entry of base oil and additives keeps the interior of the premixing device at a relatively low temperature. This low-temperature environment realizes continuous heat exchange with the electric heating pipe, which can effectively protect the vulnerable ends of the electric heating pipe and extend its service life, thereby extending the continuous production time of grease and helping to improve production efficiency. At the same time, the electric heating pipe inserted into the preheating device and the discharge pipe can also heat the mixed liquid in the premixing device and the discharge pipe, so that the mixed liquid has a certain temperature before falling into the cylinder, and the temperature of the mixed liquid makes itself more delicate and uniform, so as to reduce the stirring time of the agitator and the heating time of the heater, which not only shortens the blending time and improves the blending efficiency, but also reduces the energy consumption of the agitator and the heater, so as to further improve production efficiency.

[0048] 3. The base oil falling from the discharge port has a large potential energy. By converting the kinetic energy of the impeller, the impeller drives the gas circulation device to work, thereby reducing the pressure at the outlet of the discharge pipe and increasing the pressure of the first cavity. On the one hand, the pressurization in the first cavity makes the base oil and the additive mix more fully, reduces the working time of the subsequent agitator, and improves the blending efficiency; on the other hand, under the action of the pressure difference, the mixed liquid can be discharged quickly to avoid the blockage of the pre-mixing device, reduce the possibility of maintenance and debugging, and improve production efficiency; at the same time, the base oil converts the kinetic energy of the impeller through its own potential energy, so that it can fall more smoothly on the first inclined surface. On the one hand, the impact of the base oil on the inclined surface becomes weak, avoiding the risk of damage to the pre-mixing device due to the impact of the base oil, so that the production efficiency is guaranteed; on the other hand, the speed of the base oil falling on the first inclined surface is slowed down, and it has a longer mixing time with the additive, thereby improving the quality of blending. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic diagram of the overall isometric structure of the present invention;

[0050] Figure 2 It is a schematic diagram of the overall front cross-sectional structure of the present invention;

[0051] Figure 3 It is a schematic diagram of the overall isometric cross-sectional structure of the present invention;

[0052] Figure 4 It is a schematic diagram of the connecting pipe structure of the present invention;

[0053] Figure 5 is a schematic diagram of the second cavity structure of the present invention;

[0054] Figure 6 It is a schematic diagram of the structure of the discharge pipe of the present invention;

[0055] Figure 7 It is a schematic diagram of the overall isometric cross-sectional structure of the present invention from another angle;

[0056] Figure 8 It is a schematic diagram of the impeller structure of the present invention.

[0057] In the figure: 1, tank cover; 2, cylinder; 3, feed port 1; 31, front section 1; 32, middle section 1; 33, rear section 1; 4, feed port 2; 41, front section 2; 42, middle section 2; 43, rear section 2; 431, pressure flow surface; 5, discharge port; 6, agitator; 7, electric heating device; 71, electric heater; 72, electric heating pipeline; 721, upright section; 722, annular section; 8, base; 9, pre-mixing device; 91, first cavity; 911, first inclined surface; 9111, protrusion; 912, second inclined surface; 92, second cavity; 921, third inclined surface; 922, fourth inclined surface ; 923, fifth inclined plane; 924, sixth inclined plane; 925, discharge hole; 93, connecting pipe; 931, conical channel; 932, cylindrical channel; 10, discharge pipe; 101, connecting section; 102, spiral section; 103, discharge section; 11, gas circulation device; 111, main shaft; 112, bearing; 113, impeller; 1131, hub; 1132, blade; 11321, sheet body; 11322, convex body; 11323, conical hole; 114, cam; 115, piston; 116, compression spring; 117, pump body; 118, suction pipe; 119, exhaust pipe. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] See also Figures 1 to 8 The present invention provides a grease blending kettle, and the technical solution is as follows:

[0060] As an embodiment of the present invention, refer to Figure 2 The central axis of the feed port 1 3 is inclined, and the angle with the horizontal plane is 65°. The central axis of the feed port 2 4 is horizontal and coplanar with the central axis of the feed port 1 3. The height difference between the lowest projection point of the feed port 1 3 on the central axis and the central axis of the feed port 2 4 is 15 mm.

[0061] The feed port 1 3 and the feed port 2 4 can be cast using gray cast iron HT250, and the casting surface should be processed to be smooth, so as to facilitate close contact and welding with the outer surface of the tank cover 1, and also facilitate connection with external pipelines.

[0062] As an embodiment of the present invention, refer to Figure 3 The internal channel of the feed port 3 includes a front section 31, a middle section 32, and a rear section 33. The cross-sectional shape of the front section 31 is a circle of equal diameter, the starting section is on the outer end face of the feed port 3, and the ending section is inside the feed port 3. The cross-sectional shape of the middle section 32 is that the circular surface at the end of the front section 31 gradually transitions to a rectangle, and the ending section is inside the feed port 3. The cross-sectional shape of the rear section 33 is that the rectangle at the end of the middle section 32 transitions to another rectangle, and the ending section is arranged on the inner end face of the feed port 3. The rectangle at the end of the rear section 33 is equal in width and longer in length than the rectangle at the end of the middle section 32. The feed port 24 has the same structure as the internal channel of the feed port 3, including a front section 2 41, a middle section 2 42, and a rear section 2 43. A pressure flow surface 431 is arranged above the rear section 2 43, and the pressure flow surface 431 is an inclined surface.

[0063] When the feed port 1 3 and the feed port 2 4 are cast, the mold of the internal channel can be divided into two sections. Taking the feed port 1 3 as an example, the front section 1 31 and the middle section 1 32 can be formed by one section of the mold, and the rear end 1 can be formed by another section of the mold. In addition, after the casting is completed, the internal channels of the feed port 1 3 and the feed port 2 4 should be polished and smooth so that the base oil and additives can flow smoothly.

[0064] As an embodiment of the present invention, refer to Figure 2 The premixing device 9 includes a first cavity 91, a second cavity 92, and a connecting pipe 93. The first cavity 91 includes a first inclined surface 911 and a second inclined surface 912. The first inclined surface 911 is on the left side of the first cavity 91, is hollow inside, and has an angle of 20° with the horizontal plane. A protrusion 9111 is provided on the first inclined surface 911, and the protrusion 9111 is elliptical. The second cavity 92 is arranged below the first cavity 91. The connecting pipe 93 is sleeved on the upright section 721 and passes through the first cavity 91 and the second cavity 92.

[0065] The first cavity 91 and the second cavity 92 can both be formed by sheet metal forming technology. First, the first inclined surface 911 and the second inclined surface 912 are welded in the first cavity 91 respectively, and then the connecting pipe 93 is welded on the first inclined surface 911, while maintaining a gap connection with the lower wall of the first cavity 91. Then the second cavity 92 is sleeved on the connecting pipe 93, and welded to the first cavity 91 under the guidance of the connecting pipe 93, and finally the whole is welded to the tank cover 1. The weld seam needs to be treated with anti-corrosion and waterproofing, and an anti-corrosion coating and waterproof materials can be coated on the surface of the weld seam. After the treatment is completed, a pressure test and a water leakage test are performed to ensure the sealing of the weld seam. The material of the cylinder 2 and the tank cover 1 is generally 304 stainless steel. To ensure the welding effect, the above parts are also made of the same material.

[0066] As an embodiment of the present invention, refer to Figure 2 The second inclined surface 912 is on the right side of the first cavity 91 . The second inclined surface 912 is solid inside and has an angle of 60° with the horizontal plane. The bottom end of the second inclined surface 912 is lower than the bottom end of the first inclined surface 911 .

[0067] The second bevel 912 can be obtained by milling a square column material, and the front and rear sides thereof are welded during welding. The weld surface is smooth, close to the bevel side, and can completely fill the gap between the second bevel 912 and the first cavity 91. Note that the right side of the second bevel 912 is in close contact with the side wall of the first cavity 91. If it is not possible to ensure close contact, a weld can be added above the second bevel 912. In addition, under the condition of meeting the relevant angle requirements, the second bevel 912 can have a higher contact position with the side wall of the first cavity 91, thereby increasing the range of action of the second bevel 912 and making the premixing device 9 more effective.

[0068] As an embodiment of the present invention, refer to Figure 4 The internal channel of the connecting tube 93 includes a conical channel 931 and a cylindrical channel 932. The two conical channels 931 are respectively arranged at both ends of the connecting tube 93, and the outlet ends are respectively inside the first cavity 91 and the cylinder 2. The cylindrical channel 932 connects the two conical channels 931 and has an inner diameter of 12.5 mm.

[0069] The connecting pipe 93 is made of a 304 stainless steel pipe with a suitable inner diameter as a basic workpiece, and is obtained by further expanding the holes at both ends of the pipe using a reamer. The two ends are arranged symmetrically, and there is no need to adjust the direction during welding. It should be noted that the end of the connecting pipe 93 should be kept at a higher position in the first cavity 91 as much as possible to prevent the mixed liquid from splashing in.

[0070] As an embodiment of the present invention, refer to Figure 5The second cavity 92 includes a third inclined plane 921, a fourth inclined plane 922, a fifth inclined plane 923, a sixth inclined plane 924, and a discharge hole 925. The third inclined plane 921 and the fourth inclined plane 922 are symmetrically arranged on the left and right sides of the second cavity 92, with an angle of 18° to the horizontal plane. The fifth inclined plane 923 and the sixth inclined plane 924 are symmetrically arranged on the front and back sides of the second cavity 92, with an angle of 9° to the horizontal plane. The discharge hole 925 is located at the center of the intersection of the four inclined planes.

[0071] When processing the second cavity 92, the corresponding mold can be made first, and then the 304 stainless steel plate is heated in a heating furnace, usually between 1100°C and 1250°C, and then the plate is placed on the mold for forging and forming. After obtaining the desired shape, air cooling is performed to avoid cooling too quickly to prevent cracks and internal stress. Then, the four side walls are folded out using a bending machine after relevant cutting according to the drawing, and finally the four side walls are tightly connected by welding. It should be noted that the sealing of the weld should be guaranteed.

[0072] When the second cavity 92 is welded to the first cavity 91, a connecting pipe 93 is provided for guidance. To enhance the guiding effect, the upper surfaces of the four side walls can be made into inclined surfaces, with the inside higher and the outside lower. At the same time, the lower surface of the side wall of the first cavity 91 can be made into a shape matching therewith, and a certain gap can be left on the outside after the two are matched, thereby facilitating welding.

[0073] During use, the overall height of the second cavity 92 can be adjusted according to actual conditions, and the volume of the second cavity 92 can be increased to prevent the premixing device from being blocked by excessive flow at the feed port.

[0074] As an embodiment of the present invention, refer to Figure 5 and Figure 6 The discharge pipe 10 includes a connecting section 101, a spiral section 102, and a discharge section 103. The connecting section 101 is inserted into the discharge hole 925, and the spiral section 102 is arranged below the connecting section 101 and is sleeved on the electric heating pipe.

[0075] The pitch of the spiral section 102 increases from small to large from top to bottom, and the cross-sectional diameter decreases from large to small. The central axis of the discharge section 103 is vertical, and the cross-sectional diameter decreases gradually from top to bottom.

[0076] The discharge pipe 10 can be made of brass. On the one hand, the excellent thermal conductivity of brass can make the mixed liquid in the discharge pipe 10 heat up faster. On the other hand, brass has extremely high ductility and is easy to be processed into a complex shape. In addition, brass also has good corrosion resistance. During processing, a brass pipe with a suitable inner diameter can be selected first, then the pipe is heated, then spirally stretched, and finally cooled and solidified.

[0077] The discharge pipe 10 is welded to the discharge hole 925. To ensure that the central axis of the discharge pipe 10 coincides with the central axis of the upright section 721, the welding of the discharge pipe 10 can be carried out after the first cavity 91 and the second cavity 92 are welded. First, a reference object with the same diameter as the upright section 721 is inserted into the connecting pipe 93, and then the discharge pipe 10 is put on the reference object. After determining the position, welding is carried out. Finally, the weld is checked to ensure the sealing and the reference object is removed.

[0078] The central axis of the outlet section is vertical, so that the mixed liquid falls somewhere at the bottom of the cylinder 2. When the liquid level in the cylinder 2 does not rise to this place, the mixed liquid will continue to impact this place. For the sake of material strength, a truncated cone can be welded here to disperse the impact brought by the mixed liquid to a larger area.

[0079] As an embodiment of the present invention, refer to Figure 7 The gas circulation device 11 includes a main shaft 111, a bearing 112, an impeller 113, a cam 114, a piston 115, a compression spring 116, a pump body 117, an air extraction pipe 118, and an exhaust pipe 119. The main shaft 111 is mounted between the first inclined surface 911 and the feed inlet 3, and the middle axis is on the right side of the outlet of the feed inlet 3. The two bearings 112 are respectively nested at both ends of the main shaft 111, and the impeller 113 is sleeved on the main shaft 111. The cam 114 is sleeved on the main shaft 111 and is behind the first cavity 91, the piston 115 is below the cam 114, the compression spring 116 is sleeved on the piston 115, the pump body 117 wraps the piston 115 and is connected to the outer wall of the first cavity 91, one end of the exhaust pipe 118 is inserted into the pump body 117, and the other end is placed at the outlet of the discharge section 103, and one end of the exhaust pipe 119 is inserted into the pump body 117, and the other end is inserted into the first cavity 91.

[0080] The material selection of the main components takes into account both structural strength and economy, and the selection is as follows: the main shaft 111 is made of 45 steel, the impeller 113 is made of A356 cast aluminum alloy, and the cam 114 is made of gray cast iron HT250. During processing, a 45# bar with a shaft diameter slightly larger than the inner hole diameter of the impeller 113 is selected for turning, and the impeller 113 installation position, the bearing 112 installation position and the cam 114 installation position are turned respectively; the impeller 113 is formed by casting, and the cam 114 is formed by milling.

[0081] The gas circulation device 11 is installed when all parts have been welded but the whole has not yet been welded to the tank cover 1. First, the impeller 113 is placed in the first cavity 91, and then the main shaft 111 is inserted into one side of the first cavity 91. Then, the impeller 113 is sleeved on the main shaft 111, and then the main shaft 111 is inserted into the other side of the first cavity 91. Then, the two bearings 112 are respectively embedded in the main shaft 111 from both sides of the first cavity 91 and fixed on the two side walls of the first cavity 91. Finally, the cam 114 is embedded in the main shaft 111 from the rear of the first cavity 91, and contacts with the piston 115 in the pump body 117 that has been welded below under the action of the compression spring 116.

[0082] During use, although the mixture of base oil and additives in the first cavity 91 has a certain lubricating effect, it is not a finished grease product, so it cannot be applied to the bearing 112 to prevent undissolved particles in the mixture from damaging the bearing 112.

[0083] In addition, since the internal structure of the pump body 117 is very common, and in order to better display other structures, the internal structure of the pump body 117 is not shown in the drawings. The internal structure is briefly described below. First, there is a large space in the center of the pump body 117 for the piston 115 to be inserted and reciprocating. Secondly, the exhaust channel and the air pumping channel are opened on the left and right sides of the pump body 117 respectively and connected to the central space. There is a conical channel in each of the exhaust channel and the air pumping channel, and the two conical channels are the same in size and direction. A block is welded at the large diameter end of the channel, and a plurality of small holes are provided on the block to allow air to circulate. There is a spherical and hollow aluminum valve core in the conical channel. The outer ends of the exhaust channel and the air pumping channel are decorated with threads to facilitate the connection of the air pumping pipe 118 and the exhaust pipe 119. When the piston 115 moves upward under the elastic force of the compression spring 116, the air pressure in the central space inside the pump body 117 decreases, and the gas in the exhaust pipe 118 pushes the valve core in the exhaust pipe 118 toward the conical large-diameter end under the action of the pressure difference, so that the exhaust pipe 118 is unobstructed; at the same time, the gas in the exhaust pipe 119 pushes the valve core in the exhaust pipe 119 toward the conical small-diameter end under the action of the pressure difference, so that the exhaust pipe 119 is blocked, thereby completing the extraction of air from the outlet of the discharge pipe 10 by the pump body 117. Similarly, the exhaust of the pump body 117 into the first cavity 91 can be completed by driving the piston 115 downward through the cam 114.

[0084] As an embodiment of the present invention, refer to Figure 8The impeller 113 includes a hub 1131 and blades 1132. The hub 1131 is sleeved on the main shaft 111. The blades 1132 include a sheet body 11321, a convex body 11322, and a tapered hole 11323. The four sheets 11321 are evenly connected to the hub 1131 along the radial direction. The convex body 11322 is formed by extending outward from the end surface of the sheet body 11321. The tapered hole 11323 passes through the sheet body 11321 and the convex body 11322, and the small diameter end is on the sheet body 11321, and the large diameter end is on the convex body 11322.

[0085] The hub 1131, the sheet body 11321, and the convex body 11322 can be obtained by casting, and the tapered hole 11323 can be further processed by using a CNC punching machine. When the impeller 113 is installed on the main shaft 111, a key connection can be used to achieve circumferential positioning, and a shoulder on one side and a retaining ring can be used to achieve axial positioning. In addition, the impeller 113 rotates counterclockwise under the drive of the base oil, and the position of the sheet body 11321 and the convex body 11322 should be paid attention to during installation.

[0086] Working principle: the feed port 1 3 and the feed port 2 4 respectively guide the base oil and the additive to be discharged into the first cavity 91. The base oil and the additive are fully mixed in the first cavity 91 and then discharged into the second cavity 92, and then discharged from the second cavity 92 along the discharge pipe 10. During the discharge process, the mixed liquid absorbs the inefficient heat energy on the vertical section 721 to complete its own temperature rise. At the same time, the gas circulation device 11, driven by the base oil discharged from the feed port 3, extracts the gas at the outlet of the discharge pipe 10 and transports it to the second cavity 92.

[0087] Specifically, the base 8 is fixed on the mounting platform, and the feed port 1 3 and the feed port 2 4 are connected to the external channel respectively. When the base oil and the additive are discharged into the first cavity 91, they are spread out in the same direction, and with the help of their own mounting position, the landing point of the additive on the first inclined surface 911 is below the landing point of the base oil. The protrusion 9111 on the first inclined surface 911 makes the base oil and the additive spread out over a larger area, more fully contacted, and more finely and evenly mixed. The mixed liquid flows down along the first inclined surface 911 while mixing, and is quickly discharged from the first cavity 91 to the second cavity 92 under the auxiliary guidance of the second inclined surface 912. The mixed liquid of a certain height can be accumulated in the second cavity 92, so that the mixed liquid continues to mix while being discharged from the discharge hole 925 to the discharge pipe 10. The electric heater 71 in the electric heating device 7 heats the electric heating pipe 72, wherein the annular section 722 plays the main heating role, while the heat energy released by the vertical section 721 is inefficient. The discharge pipe 10 has good thermal conductivity and can efficiently transfer the inefficient heat energy on the vertical section 721 to the mixed liquid in the pipe, so that the mixed liquid is heated. At the same time, the design of the spiral section 102 and the discharge section 103 allows the mixed liquid to be quickly discharged into the barrel 2 after heating, and then neutralized under the stirring of the stirrer 6, and finally discharged into the finished product area through the discharge port 5.

[0088] Simultaneously with the above process, the impeller 113 is arranged in the first cavity 91 and driven by the base oil discharged from the feed port 3 to rotate counterclockwise. The rotation of the impeller 113 drives the cam 114, and then drives the piston 115 used in conjunction with the cam 114. The piston 115 moves back and forth in a straight line in the pump body 117, and the gas around the feed pipe 10 is extracted by the exhaust pipe 118, and the extracted gas is discharged into the second cavity 92 by the exhaust pipe 119, so that the mixed liquid in the second cavity 92 is discharged more smoothly under the action of the pressure difference.

[0089] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, 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 grease blending kettle, comprising a tank cover (1), a cylinder (2), a first feed port (3), a second feed port (4), a discharge port (5), a stirrer (6), an electric heating device (7), and a base (8), characterized in that: The invention also comprises a pre-mixing device (9), a discharge pipe (10), and a gas circulation device (11); the electric heating device (7) comprises an electric heater (71) and an electric heating pipe (72); the two electric heaters (71) are respectively connected to the top of the tank cover (1) and the bottom of the cylinder (2); the electric heating pipe (72) comprises a vertical section (721) and an annular section (722); the upper end of the vertical section (721) is inserted into the electric heater (71) on the tank cover (1); The end of the annular section (722) is inserted into the electric heater (71) at the bottom of the barrel (2); the premixing device (9) is wrapped around the upright section (721) and exchanges heat with the upright section (721); the discharge pipe (10) is inserted below the premixing device (9) and wraps the upright section (721); the gas circulation device (11) is connected to the rear of the premixing device (9); and the ends of the feed port 1 (3) and the feed port 2 (4) are both inserted into the premixing device (9); The base oil discharged from the feed port 1 (3) converts its potential energy into kinetic energy of the gas circulation device (11). The gas circulation device (11) uses the obtained kinetic energy to extract the gas at the outlet of the discharge pipe (10) to reduce the pressure at the outlet, and inputs the extracted gas into the premixing device (9) to increase the pressure inside the device.

2. A grease blending kettle according to claim 1, characterized in that: The center axis of the first feed port (3) is inclined, and the angle between it and the horizontal plane is α, and 60°≤α≤70°; the center axis of the second feed port (4) is horizontal and coplanar with the center axis of the first feed port (3); the height difference between the lowest projection point of the first feed port (3) on the center axis and the center axis of the second feed port (4) is h, and h is 0.08 to 0.10 of the diameter of the inner circular contour of the can cover (1).

3. A grease blending kettle according to claim 1, characterized in that: The internal channel of the feed port 1 (3) comprises a front section 1 (31), a middle section 1 (32), and a rear section 1 (33); the cross-sectional shape of the front section 1 (31) is a circle of equal diameter, the starting cross-sectional shape is on the outer end face of the feed port 1 (3), and the ending cross-sectional shape is inside the feed port 1 (3); the cross-sectional shape of the middle section 1 (32) is a circular surface at the end of the front section 1 (31) gradually transitioning to a rectangle, and the ending cross-sectional shape is inside the feed port 1 (3); the cross-sectional shape of the rear section 1 (33) is a rectangle transitioning from the ending cross-sectional shape of the middle section 1 (32) to another rectangle, and the ending cross-sectional shape is arranged on the inner end face of the feed port 1 (3); the rectangle at the ending cross-sectional shape of the rear section 1 (33) is equal in width and longer in length than the rectangle at the ending cross-sectional shape of the middle section 1 (32); The structure of the internal channel of the feed port 2 (4) is the same as that of the feed port 1 (3), including a front section 2 (41), a middle section 2 (42), and a rear section 2 (43). A pressure flow surface (431) is provided above the rear section 2 (43), and the pressure flow surface (431) is an inclined surface.

4. A grease blending kettle according to claim 2, characterized in that: The premixing device (9) comprises a first cavity (91), a second cavity (92), and a connecting pipe (93); the first cavity (91) comprises a first inclined surface (911) and a second inclined surface (912); the first inclined surface (911) is on the left side of the first cavity (91), is hollow inside, and has an angle β with the horizontal plane, and 15°≤ β≤90°-α； The first inclined surface (911) is provided with a protrusion (9111), and the protrusion (9111) is elliptical. The second cavity (92) is arranged below the first cavity (91). The connecting pipe (93) is sleeved on the upright section (721) and passes through the first cavity (91) and the second cavity (92).

5. A grease blending kettle according to claim 4, characterized in that: The second inclined surface (912) is on the right side of the first cavity (91), the interior of the second inclined surface (912) is solid, and the angle between the second inclined surface (912) and the horizontal plane is γ, 45°≤γ≤65°, and the sum of β and γ should be less than 90°, and the bottom end of the second inclined surface (912) is lower than the bottom end of the first inclined surface (911).

6. A grease blending kettle according to claim 4, characterized in that: The internal channel of the connecting pipe (93) comprises a conical channel (931) and a columnar channel (932). The two conical channels (931) are respectively arranged at both ends of the connecting pipe (93), and are respectively located inside the first cavity (91) and the cylinder (2). The columnar channel (932) connects the two conical channels (931), and has an inner diameter that is 0.5 to 1 mm larger than the diameter of the electric heating pipe (72).

7. The grease blending kettle according to claim 5, characterized in that: The second cavity (92) comprises a third inclined plane (921), a fourth inclined plane (922), a fifth inclined plane (923), a sixth inclined plane (924), and a discharge hole (925); the third inclined plane (921) and the fourth inclined plane (922) are symmetrically arranged on the left and right sides of the second cavity (92), with an angle δ with the horizontal plane, and 15°≤δ≤0.5γ; the fifth inclined plane (923) and the sixth inclined plane (924) are symmetrically arranged on the front and back sides of the second cavity (92), with an angle ε with the horizontal plane, and ε is half of δ; the discharge hole (925) is located at the center where the four inclined planes intersect.

8. The grease blending kettle according to claim 7, characterized in that: The discharge pipe (10) comprises a connecting section (101), a spiral section (102), and a discharge section (103); the connecting section (101) is inserted into the discharge hole (925); the spiral section (102) is arranged below the connecting section (101) and is sleeved on the electric heating pipe; The pitch of the spiral section (102) increases from small to large from top to bottom, and the cross-sectional diameter decreases from large to small. The central axis of the discharge section (103) is vertical, and the cross-sectional diameter gradually decreases from top to bottom.

9. A grease blending kettle according to claim 8, characterized in that: The gas circulation device (11) comprises a main shaft (111), a bearing (112), an impeller (113), a cam (114), a piston (115), a compression spring (116), a pump body (117), an air extraction pipe (118), and an exhaust pipe (119); the main shaft (111) is mounted between the first inclined surface (911) and the discharge port (5) 1, and the central axis is on the right side of the outlet of the feed port 1 (3); The two bearings (112) are respectively nested at two ends of the main shaft (111), the impeller (113) is sleeved on the main shaft (111), the cam (114) is sleeved on the main shaft (111) and is located behind the first cavity (91), the piston (115) is located below the cam (114), the compression spring (116) is sleeved on the piston (115), the pump body (117) wraps around the piston (115) and is connected to the outer wall of the first cavity (91), one end of the exhaust pipe (118) is inserted into the pump body (117), and the other end is placed at the outlet of the discharge section (103), and one end of the exhaust pipe (119) is inserted into the pump body (117), and the other end is inserted into the first cavity (91).

10. A grease blending kettle according to claim 9, characterized in that: The impeller (113) comprises a hub (1131) and blades (1132); the hub (1131) is sleeved on the main shaft (111); the blades (1132) comprise a sheet body (11321), a convex body (11322), and a tapered hole (11323); four sheets (11321) are evenly connected to the hub (1131) in a radial direction; the convex body (11322) is formed by extending outward from the end surface of the sheet body (11321); the tapered hole (11323) penetrates the sheet body (11321) and the convex body (11322), with a small diameter end on the sheet body (11321) and a large diameter end on the convex body (11322).

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