CN209906339U - a vacuum pump - Google Patents

Abstract

The utility model relates to a vacuum pumping machine, which comprises a liquid barrel assembly, the liquid barrel assembly comprises a barrel body for holding liquid, and the barrel body is provided with a liquid inlet pipe interface for connecting a liquid inlet pipe; assembly, the liquid full protection assembly includes a fixed assembly connected with the upper end opening of the barrel body and having an installation channel that penetrates up and down; a vacuum pump assembly, the vacuum pump assembly at least partially protrudes into the liquid full protection assembly through the installation channel to communicate with the liquid The full protection assembly is fixedly connected; the lower end of the vacuum pump assembly has an intake pipe, and the outer periphery of the intake pipe is provided with a third sealing ring that extends upward and is gradually separated from the outer wall of the intake pipe; the third sealing ring is assembled with the inner wall of the installation channel by interference And the contact area of the upper end with the inner wall of the installation channel increases with the increase of the negative pressure in the barrel. Compared with the prior art, the utility model has good sealing performance, high strength and high working efficiency.

Description

a vacuum pump

technical field

The utility model relates to the electric field, in particular to a vacuum pumping machine.

Background technique

Pumping units, such as small pumping units, are widely used in actual production and life, and people try to improve the working efficiency of the pumping unit through various improvements. For example, Chinese utility model patent ZL201820653372.8 discloses a vacuum pumping machine, which extracts the gas in the barrel through a vacuum pump, and uses the external air pressure greater than the air pressure in the barrel to press liquid such as oil into the barrel. The volume of the liquid in the barrel increases, and the pumping speed gradually decreases. When it is less than the pumping speed of the pump, the protection valve of the anti-squeeze protection component is opened to allow the outside air to enter the barrel to maintain the pressure difference. The float in the liquid full protection assembly drives the sealing cap to block the air inlet of the vacuum pump, thereby completing the pumping work.

In the actual use of the solution disclosed in this document, the vacuum pump needs to be pushed down to complete the sealing connection with the liquid full protection component, which is inconvenient to operate and reduces the work efficiency. In this case, there are many consumables for the sealing ring, and the overall sealing performance of the system is Not the best.

At the same time, the solution is prone to deformation of the barrel when the liquid is pumped, which further affects the work efficiency, and the current design is not humane enough and easily pollutes the environment.

Utility model content

In view of the above problems, one aspect of the present invention aims to provide a vacuum pumping machine with convenient installation, low production cost, good sealing performance and high working efficiency.

Another object of the present utility model is to provide a vacuum pumping machine with high strength of the barrel body, which can effectively prevent the deformation of the barrel body and smoothly realize the pumping of liquid.

Another purpose of the present utility model is to provide a humanized design, green and environment-friendly vacuum pumping machine.

In order to achieve the above purpose, the technical scheme of the present utility model is: a vacuum pumping machine, comprising:

a liquid barrel assembly, the liquid barrel assembly includes a barrel body for holding liquid, and the barrel body is provided with a liquid inlet pipe interface for connection of a liquid inlet pipe;

a liquid full protection assembly, the liquid full protection assembly includes a fixed assembly connected to the opening of the upper end of the barrel body and having an installation channel that penetrates up and down;

a vacuum pump assembly, the vacuum pump assembly at least partially protrudes into the liquid full protection assembly through the installation channel to be fixedly connected with the liquid full protection assembly;

It is characterized by:

The lower end of the vacuum pump assembly has an air inlet pipe, and the outer periphery of the air inlet pipe is provided with a third sealing ring whose free end extends upward and is gradually separated from the outer wall of the air inlet pipe;

The third sealing ring is fitted with the inner wall of the installation channel by interference, and the contact area of the free end thereof with the inner wall of the installation channel increases with the increase of the negative pressure in the barrel.

Preferably, the fixing component is provided with a carrier sheet, the carrier sheet is provided with a through hole suitable for the insertion of the air intake pipe, and the lower end surface of the third sealing ring is flat and fits with the upper end surface of the carrier sheet .

Preferably, the liquid full protection assembly further includes a float, one end of which is located in the fixing assembly and the other end extends into the barrel and penetrates through;

The float is provided with a sealing cap which is fixedly assembled with it and can move up and down in the fixing assembly to seal the air intake pipe, and the upper end surface of the sealing cap is inverse conical shape.

Preferably, the lower end sidewall of the fixing assembly is provided with an air inlet, and the air inlet cooperates with the air inlet pipe to form an air flow channel through which the gas in the barrel can circulate;

The barrel body is provided with a second interface, and the liquid pumping machine further includes an air pressure regulating component which is sealedly connected to the second interface and can change the degree of sealing according to the negative pressure in the barrel to adjust the air pressure in the barrel.

Preferably, the outer wall of the barrel is provided with multiple sets of reinforcing ribs.

Preferably, the reinforcing ribs are formed along the circumferential direction of the outer wall of the barrel and distributed longitudinally.

Preferably, the outer wall of the barrel is further provided with an oil pipe receiving groove for receiving the liquid inlet pipe.

Preferably, there are two oil pipe storage grooves, which are respectively disposed on both sides of the barrel body and form a hollow cavity along the length direction of the barrel body.

Preferably, hanging holes are respectively provided on the outer walls of the oil pipe receiving grooves for fixing the straps.

Preferably, the outer wall of the barrel is further provided with a plug placement portion, and the plug is adapted to the size of the installation channel and the inlet pipe interface respectively;

The surface of the barrel is provided with a capacity mark, and the liquid inlet pipe is connected with the liquid inlet pipe interface through a pipe joint.

Compared with the prior art, the advantage of the present utility model is that the sealing ring is designed so that only the root part is connected to the air intake pipe, and is assembled with the inner wall of the installation channel by interference, which not only saves materials and reduces costs, but also enables the upper end of the sealing ring to follow. As the negative pressure in the barrel increases, it moves downward to increase the contact area with the inner wall of the installation channel, which can better ensure the sealing performance and improve the sealing effect, and the inverted conical design of the sealing cap can also further improve the sealing performance; It is used to enhance the thickness of the barrel, thereby increasing the strength of the barrel, preventing the deformation of the barrel, and improving work efficiency; the design of the storage groove and the stopper placement part is convenient for the operator to store the liquid inlet pipe when it is not in use, and block the interface to prevent liquid Outflow, pollute the environment, reasonable design, improve the comfort of use.

Description of drawings

1 is a schematic structural diagram of a pumping unit according to an embodiment of the present utility model;

Fig. 2 is the explosion structure diagram of Fig. 1;

Fig. 3 (a) is the explosion structure diagram of the liquid full protection assembly in Fig. 1;

Figure 3(b) is a state diagram of the position of the float in the liquid full protection assembly when the liquid in the barrel in Figure 1 does not reach a certain amount;

Figure 3(c) is a state diagram of the float in Figure 1 rising to a certain position with the liquid in the barrel;

Figure 3(d) is a state diagram of the position of the float in the liquid full protection assembly after the liquid in the barrel is full in Figure 1;

Fig. 4 (a) is the exploded structure diagram of the air pressure regulating assembly in Fig. 1;

Figure 4(b) is a schematic diagram of the air flow path when the air pressure regulating assembly opens when the force generated by the negative pressure in the barrel in Figure 1 is greater than the spring restoring force;

Fig. 4(c) is a schematic structural diagram of the closed air pressure adjusting assembly when the force generated by the negative pressure in the barrel in Fig. 1 is smaller than the spring restoring force.

FIG. 4(d) is a schematic diagram of the combination and separation structure of the screw and the nut cover in the air pressure regulating assembly in FIG. 1 .

FIG. 5 is a structural diagram of the vacuum pump assembly in FIG. 1 .

FIG. 6 is a schematic structural diagram of the liquid tank assembly in FIG. 1 .

FIG. 7 is a schematic structural diagram of the preferred liquid pumping machine of the present invention after some components are removed.

8 is a schematic structural diagram of the sealing ring at the intake pipe of the vacuum pump assembly in the preferred liquid pumping machine of the present invention.

FIG. 9 is a schematic diagram of the structure of the cover cylinder in this embodiment.

FIG. 10 is a schematic structural diagram of the liquid full protection assembly in this embodiment.

Fig. 11 is a cross-sectional view of a preferred structure in which the liquid pumping machine of the present application is plugged with a plug.

Fig. 12 is a schematic diagram of the structure of the fixed seat in Fig. 3(b).

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but should not be construed as a limitation of the present invention.

The terms "first" and "second" are only used for the purpose of description, and should not be interpreted as indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a reference to the present invention. limits.

Figures 1-9 show the structure of the liquid pumping machine according to an embodiment of the present invention. 1 and 2 , the liquid pumping machine includes a liquid barrel assembly 1 for holding liquid and a vacuum pump assembly 2 . The liquid barrel assembly 1 includes a barrel body 12 , and a liquid inlet pipe interface 11 is provided on the barrel body 12 . The feature of this embodiment is that the liquid pumping machine has a liquid full protection assembly 3, and the vacuum pump assembly 2 is connected to the liquid barrel assembly 1 through the liquid full protection assembly 3, and the liquid full protection assembly 3 can reach a certain level of liquid in the barrel. When the vacuum pump assembly 2 is activated, the liquid can be prevented from entering the vacuum pump assembly 2 and damaging the pump body.

Specifically, referring to FIGS. 3(a)-3(d) and FIG. 10 , the liquid full protection assembly 3 includes a fixing assembly 31 that is connected to the opening of the upper end of the tub body 12 of the liquid tub assembly 1, and one end is located in the The other end of the fixing assembly 31 extends into the float 32 in the barrel 12 , the float 32 can move up and down in the fixing assembly 31 , and the fixing assembly 31 is formed with an installation channel 319 that penetrates up and down.

Please refer to FIG. 5 and FIG. 8 together. One end of the vacuum pump assembly 2 having the air inlet pipe 21 extends into the fixing assembly 31 through the installation channel 319 to be fixedly connected to the liquid full protection assembly 3 . The outer circumference of the air inlet pipe 21 is There is a third sealing ring 22 whose free end extends upward and is gradually separated from the outer wall of the air inlet pipe 21. The third sealing ring 22 is fitted with the inner wall of the installation channel 319 by interference. The free end of the third sealing ring 22 can be loaded with the barrel. The increase of the pressure increases the contact area with the inner wall of the installation channel. Specifically, as shown in Figure 8, the vacuum pump draws out the air, and the inside of the barrel 12 is in a negative pressure state, and the third sealing ring 22 will be subjected to downward force. The inner wall of the through hole 319 fits more tightly, and this design greatly improves the sealing effect between the vacuum pump assembly 2 and the liquid full protection assembly 3 . In this embodiment, the position where the distance between the third sealing ring 22 and the air intake pipe 21 is the smallest, that is, the lower end of the third sealing ring 22 is connected with a sleeve 23 , and the third sealing ring 22 is sleeved on the sleeve 23 through the sleeve 23 . on the outer wall of the intake pipe 21 .

Of course, the third sealing ring 22 can also be arranged in a tapered shape, that is, the third sealing ring 22 is formed in an inverted cone and is sleeved on the outer wall of the air intake pipe 21. Obviously, in this case, the corresponding position of the fixing component 31 is also tapered. The structure is adapted to fit with the third sealing ring 22 , which is a useful technical means for those skilled in the art, and will not be repeated here.

As shown in FIGS. 3(a)-3(d) and 5, the fixing assembly 31 is provided with a carrier sheet 38, and the carrier sheet 38 is provided with a through hole 381 suitable for the insertion of the air intake pipe 21, The lower end surface of the third sealing ring 22 is flat and is in contact with the upper end surface of the carrier sheet 38 to further ensure the sealing effect.

The float 32 is adsorbed on the lower end of the air intake pipe 21 under the action of liquid buoyancy and airflow when the liquid in the bucket rises to a certain height, thereby sealing the air intake pipe 21 to prevent the liquid from entering the pump with the suction of the pump and damaging the pump body. . In this embodiment, the liquid tank assembly 1 includes a disk port 13 threadedly connected to the port of the tank body 12, and the liquid full protection assembly 1 is connected to the disk port 13 to achieve assembly and fixation with the tank body 12. The specific movement process of the float is shown in Figure 3(b)-3(d).

It can be seen from FIG. 3( b ) that the float 3 has a circle of flanges 325 . The flanges 325 can rest on the ribs 311 when the float 32 moves downward to prevent the float 32 from falling off the fixing assembly 31 . The inner wall of the fixing assembly 31 has at least three ribs 311 formed inward; the ribs 311 are in contact with the outer peripheral surface of the float 32, and the ribs 311 play a role in positioning the float 32 to prevent the float 32 from being obliquely stuck; at the same time, the The fixing assembly 31 also has an air inlet 312 correspondingly formed above the rib 311 . The air inlet 312 cooperates with the air inlet pipe 21 to form an air flow channel for the air in the barrel to circulate.

The fixing assembly 31 includes a cover cylinder 313 penetrating through, a fixing seat 314 which is assembled and connected with the cover cylinder 313 through at least one screw; the liquid full protection assembly 3 is threadedly connected to the inner wall of the channel of the disk port 13 through the cover cylinder 313; The rib 311 is formed on the inner wall of the fixing seat 314 , and the float 32 is limited in the fixing seat 313 . The inner wall of the cover cylinder 313 is provided with a plurality of long ribs 313B extending inwardly and in contact with the outer periphery of the vacuum pump assembly 2 to fix the vacuum pump assembly 2 , see FIGS. 9 , 10 and 12 .

The float 32 has a sealing cap 321 which is fixedly assembled with it and can move up and down in the fixing assembly 31 to seal the air intake pipe 21. In this embodiment, the upper end surface of the sealing cap 321 is in the shape of an inverted cone. Of course, the sealing cap 321 is made of soft rubber material; in order to achieve sealing, a first sealing ring 33 is provided between the cover cylinder 313 and the inner wall of the channel of the disk port 13 .

When the vacuum pump assembly is working, most of the air in the barrel is drawn out by the vacuum pump through the airflow channel formed by the air inlet 312 and the air intake pipe 21. The specific route is the S channel shown by the arrow in Figure 3(b). When the float is removed, the float will not float up due to the influence of the airflow, and the external liquid will be drawn into the barrel due to the internal and external pressure difference; as the liquid is continuously sucked into the barrel, when the liquid contacts the float, the float will move up under the action of buoyancy. When the float moves up beyond the air inlet, the air intake area suddenly decreases, as shown by the arrow in Figure 3(c), the area formed between the float and the air intake pipe is quickly evacuated into a vacuum, the negative pressure increases, and the airflow follows the M The channel flows, the float is pushed up instantly under the action of the air flow, the sealing cap on the float is attached to the intake pipe of the vacuum pump, forming a plane seal with the intake pipe, so that the liquid cannot enter the pump, effectively preventing the liquid from being sucked into the pump the goal of.

1, 2 and 4(a)-4(d), the barrel body 12 is provided with a second interface 121. Correspondingly, the liquid pumping machine further includes a sealing engagement with the second interface 121. The air pressure adjusting component 4 can adjust the air pressure in the barrel 12 by changing the sealing degree according to the negative pressure in the barrel 12 . When the inlet speed of the pumped liquid is lower than the pumping speed of the pump, the vacuum degree in the barrel will increase. Adjust the air pressure in the barrel to reduce the negative pressure in the barrel to a certain extent to avoid the occurrence of the above hazards.

Specifically, the air pressure adjusting assembly 4 includes a cover assembly 41, a spring 42, a nut cover 49, a first nut 43, a second sealing ring 44 and a screw 45 assembled in sequence from top to bottom; the screw 45 The first nut 43, the nut cover 49 and the spring 42 are passed through the first nut 43, the nut cover 49 and the spring 42 in sequence from bottom to top. The end of the screw 45 is located in the cover assembly 41; One end is positioned inside the upper end of the nut cover 49 for fixing; the second sealing ring 44 is located in the groove 451 at the root of the screw 45 and has a sealing surface with the lower end of the first nut 43 under the action of the restoring force of the spring 42 counteract the tendency to close the air pressure regulating assembly 4, thereby sealing the second interface;

The screw 45 can move downward or upward under the action of the negative pressure in the barrel 12 and the restoring force of the spring 42 so as to change the degree of sealing between the second sealing ring 44 and the first nut 43, and realize the opening or closing of the air pressure adjustment. The component 4 is used to adjust the opening degree of the second interface 121 to adjust the air pressure in the barrel 12 .

As an improvement, the cover assembly 41 includes a negative pressure adjusting knob 411 and a knob cover 412 located above the negative pressure adjusting knob 411. One end of the spring 42 is sleeved on the outer periphery of the lower end of the negative pressure adjusting knob 411 for fixing, and the screw 45 The end extends into the knob cover 412; the negative pressure adjustment knob 411 is threadedly matched with the screw 45 through the second nut 46, and the second nut 46 sinks in the negative pressure adjustment knob 411 through the hexagonal surface fit, and by screwing the negative pressure The pressure adjustment knob 411 can make the screw 45 move up and down, thereby changing the compression amount of the spring 42, and then setting the force value of the air pressure adjustment assembly 4 to open; the knob cover 412 is provided with a force value direction mark (not shown in the figure) .

That is, when the negative pressure in the barrel does not exceed the set value, the sealing ring at the root of the screw, under the action of the spring, bears against the sealing surface of the first nut and reaches a sealing state, and the air pressure adjustment component is in a closed state; when the inlet speed of the extracted liquid is less than When the pump is pumping vacuum speed, the negative pressure in the barrel will continue to rise. When the set spring force value is exceeded, the screw will overcome the force of the spring under the action of negative pressure and move downward, so that the sealing ring and the first screw will move downward. The sealing surface of the cap is separated, the second interface is opened, that is, the air pressure adjustment component is opened, and the outside air enters the barrel along the path shown by the arrow in Figure 4(b), the vacuum degree in the barrel decreases, and the negative pressure decreases. When the pressure is lower than the set value, the screw will move up again under the action of the spring, the sealing ring and the sealing surface of the first nut will be resealed, and the air pressure adjustment component will be closed again, so that the negative pressure in the barrel can be adjusted automatically, effectively preventing Damage to device components.

In order to prevent the screw from rotating in the process of rotating the negative pressure adjusting knob, as an improvement, the middle part of the screw 45 is designed as a flat structure, which is adapted to the flat hole 491 of the nut cover 49, so that when the negative pressure adjusting knob is rotated At the same time, in order to prevent the screw from falling into the barrel due to excessive rotation of the negative pressure adjustment knob, the end of the screw 45 has two threads with different diameters, and the lower thread is larger than the upper thread; The second nut 46 is sleeved on the thread of the lower section, the second nut 46 and the screw rod 45 are movably connected and can rotate relative to each other, and a limit nut 47 is sleeved on the upper section of the thread, and the limit nut 47 and the screw rod 45 are fixedly connected. When the second nut 46 is moved to move the screw rod 45 downward, the limit nut 47 will push up against the second nut 46 and move upward excessively, thereby preventing the screw rod and the second nut from falling off and falling into the barrel.

As shown in FIG. 6 , the diameter of the mouth 13 is small at the bottom and large at the top. This design is convenient for pouring out the liquid, and it also makes the liquid not easily spilled, and at the same time, it can collect the liquid dripping during the operation. At the same time, the air pressure adjustment assembly 4 is threadedly matched with the second interface 121 to achieve fixed assembly, thereby improving the performance of the pump.

In order to increase the thickness of the barrel and prevent the deformation of the barrel during pumping, the outer wall of the barrel 12 is provided with a plurality of sets of reinforcing ribs 125. As shown in FIG. 7, the reinforcing ribs 125 are formed along the circumferential direction of the outer wall of the barrel 12, and distributed vertically. In order to store the liquid inlet pipe after the liquid is pumped, the outer wall of the barrel body 12 is also provided with an oil pipe storage groove 126 for receiving the liquid inlet pipe. side, and a hollow cavity is formed along the length direction of the barrel body 12 . In order to facilitate checking the liquid volume in the barrel, the outer surface of the barrel 12 is provided with a capacity mark A.

Referring further to FIG. 7 , hanging holes 127 are respectively provided on the outer walls of the oil pipe receiving grooves 126 for fixing the straps 128 . At the same time, in order to prevent the liquid from flowing out of the barrel, as shown in FIG. 1 , the outer wall of the barrel 12 is also provided with a plug placement portion for placing the idle plug 129 , the plug 129 is connected to the installation channel 319 and the liquid inlet pipe interface 11 After the liquid extraction is completed, plug the inlet pipe interface 11 and the installation channel 319 with the plug 129, so that the corresponding opening can be sealed to prevent the liquid from spilling out, which is green and environmentally friendly. The specific effect is shown in Figure 11. shown.

At the same time, in order to facilitate the connection of liquid inlet pipes of different diameters with the liquid inlet pipe interface 11 , the liquid inlet pipe is connected to the liquid inlet pipe interface 11 through a pipe joint 14 , as shown in FIG. 6 . One end of the pipe joint 14 is adapted to the size of the liquid inlet pipe interface 11 so as to be tightly sleeved with the liquid inlet pipe interface 11, and the other end of the pipe joint 14 is adapted to the size of the liquid inlet pipe diameter, so as to facilitate the liquid inlet pipe sleeve Connected to the other end, that is, according to the thickness of the liquid inlet pipe, there are many kinds of pipe joints 14, but no matter what kind of pipe joint it is, the size of the end connected to the liquid inlet pipe interface 11 is the same, and the difference is the pipe joint. The size of the other end for connecting the liquid inlet pipe is determined according to the thickness of the liquid inlet pipe, so as to improve the adaptability.

In addition to the above improvements, other similar improvements are also included in the scope of the improvements of the present invention, which will not be repeated here.

Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, The scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. A vacuum pumping machine, comprising: a liquid barrel assembly (1), the liquid barrel assembly (1) comprises a barrel body (12) for holding liquid, and the barrel body (12) is provided with a liquid inlet pipe interface (11) for connecting a liquid inlet pipe; a liquid full protection assembly (3), the liquid full protection assembly (3) comprising a fixing assembly (31) connected to the upper end opening of the barrel body (12) and having an installation channel (319) that penetrates up and down; a vacuum pump assembly (2), the vacuum pump assembly (2) at least partially protrudes into the liquid full protection assembly (3) through the installation channel (319) to be fixedly connected with the liquid full protection assembly (3); It is characterized by: The lower end of the vacuum pump assembly (2) is provided with an air inlet pipe (21), and the outer periphery of the air inlet pipe (21) is provided with a third sealing ring (22) whose free end extends upward and is gradually separated from the outer wall of the air inlet pipe (21); The third sealing ring (22) is fitted with the inner wall of the installation channel (319) by interference, and the contact area of its free end with the inner wall of the installation channel (319) increases as the negative pressure in the barrel (12) increases. 2. according to the described vacuum pumping machine of claim 1, it is characterized in that: The fixing assembly (31) is provided with a carrier sheet (38), the carrier sheet (38) is provided with a through hole (381) suitable for the insertion of the air intake pipe (21), and the third sealing ring ( The lower end surface of 22) is flat and is attached to the upper end surface of the carrier sheet (38). 3. according to the described vacuum pumping machine of claim 1, it is characterized in that: The liquid full protection assembly (3) further comprises a float (32), one end of which is located in the fixing assembly (31) and the other end extends into the barrel (12) and penetrates through; The float (32) is provided with a sealing cap (321) which is fixedly assembled with it and can move up and down in the fixing assembly (31) to seal the air intake pipe (21). The upper end surface of the sealing cap (321) Inverted cone. 4. vacuum pumping machine according to claim 1 is characterized in that: An air inlet (312) is provided on the side wall of the lower end of the fixing assembly (31), and the air inlet (312) cooperates with the air inlet pipe (21) to form an air flow channel through which the gas in the barrel can circulate; The barrel body (12) is provided with a second interface (121), and the liquid pumping machine further includes a sealing connection with the second interface (121), and the degree of sealing can be changed according to the negative pressure in the barrel body (12). The air pressure adjusting assembly (4) is used to adjust the air pressure in the barrel body (12). 5. according to the described vacuum pumping machine of claim 1, it is characterized in that: The outer wall of the barrel body (12) is provided with a plurality of groups of reinforcing ribs (125). 6. according to the described vacuum pumping machine of claim 5, it is characterized in that: The reinforcing ribs (125) are formed along the circumferential direction of the outer wall of the barrel body (12) and distributed longitudinally. 7. The vacuum pumping machine according to claim 1, is characterized in that: The outer wall of the barrel (12) is further provided with an oil pipe receiving groove (126) for receiving the liquid inlet pipe. 8. according to the described vacuum pumping machine of claim 7, it is characterized in that: There are two oil pipe receiving grooves (126), which are respectively disposed on both sides of the barrel body (12), and form a hollow cavity along the length direction of the barrel body (12). 9. according to the described vacuum pumping machine of claim 8, it is characterized in that: Hanging holes (127) are respectively provided on the outer walls of the oil pipe receiving grooves (126) for fixing the straps (128). 10. according to the described vacuum pumping machine of claim 4, it is characterized in that: The outer wall of the barrel body (12) is further provided with a plug placement portion, and the plug (129) is adapted to the size of the installation channel (319) and the liquid inlet pipe interface (11) respectively; The surface of the barrel body (12) is provided with a capacity mark (A), and the liquid inlet pipe is connected to the liquid inlet pipe interface (11) through a pipe joint (14).

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