Gearbox and roots pump

Abstract

The utility model belongs to the technical field of vacuum pumps, and particularly provides a gearbox and a roots pump, the gearbox comprises a box body, a heat exchange pipe and a sealing joint, the heat exchange pipe is arranged in the box body, one end of the sealing joint is connected with the heat exchange pipe, and the other end of the sealing joint extends out of the box body to be connected with an external pipeline. Therefore, the problems that the heat exchange tube and the gear box are not tightly connected and leakage is prone to occurring are effectively solved. According to the utility model, fluid is ensured not to leak from the connecting part in the heat exchange process, the sealing performance of the whole system is improved, and energy loss and environmental pollution caused by leakage are reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of vacuum pumps, and specifically relates to a gear box and a Roots pump. Background Art

[0002] Existing gearboxes typically consist of a housing and heat exchange tubes installed within. However, current gearbox structures lack a sealing joint that effectively connects the heat exchange tubes within the housing with external piping. This results in loose connections and leaks during heat exchange between the gearbox and external piping, impacting the gearbox's performance and reliability. Utility Model Content

[0003] Therefore, the technical problem to be solved by this application is to provide a gear box and a Roots pump, wherein the gear box is provided with a sealing joint, one end of which is connected to the heat exchange tube inside the box body and the other end is connected to the external pipeline, thereby overcoming the problem of loose connection and easy leakage between the heat exchange tube and the gear box, and improving the performance and reliability of the gear box.

[0004] In order to solve the above problems, one aspect of the present application provides a gearbox, comprising:

[0005] Box;

[0006] a heat exchange tube, the heat exchange tube being arranged in the box;

[0007] A sealing joint, one end of which is located in the box and connected to the heat exchange tube, and the other end of which extends out of the box and is connected to an external pipeline.

[0008] Optionally, a first groove is formed on the surface of the sealing joint that contacts the box body, and a first elastic pad is provided in the first groove to form a first sealing structure.

[0009] Optionally, the sealing joint includes a first sealing body and a second sealing body, the first sealing body is connected to the second sealing body, a second groove is provided on the surface of the second sealing body in contact with the first sealing body, and a second elastic pad is provided in the second groove to form a second sealing structure.

[0010] Optionally, the first sealing body is screwed to the second sealing body.

[0011] Optionally, a mounting hole for passing the second sealing body is opened on the box body, the hole wall of the mounting hole is an internal thread structure, the outer wall of the second sealing body is an external thread structure, and the second sealing body and the mounting hole are connected through the internal thread structure and the external thread structure.

[0012] Optionally, an observation window is provided on the box body, and the observation window is located at the lower part of the box body for monitoring the oil level.

[0013] Optionally, an oil drain hole is provided on the bottom surface of the box body, and the oil drain hole is used to connect to an external oil guide pipe.

[0014] Optionally, an oil filling hole is provided on the top surface of the box body, and the oil filling hole is used to connect to an external oil filling device.

[0015] Optionally, a vacuum hole is provided on the top surface of the box body, and the vacuum hole is used to connect an external vacuum device.

[0016] Another aspect of the present application provides a Roots pump comprising the gearbox described in any one of the above.

[0017] Beneficial effects

[0018] The present invention provides a gearbox and Roots pump. The gearbox is equipped with a sealing joint, one end of which connects to a heat exchange tube within the gearbox and the other end to an external pipeline. This effectively solves the problem of loose and leaky connections between the heat exchange tube and the gearbox. This ensures that fluid does not leak from the connection during heat exchange, improves the sealing of the entire system, and reduces energy loss and environmental pollution caused by leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a gearbox according to an optional embodiment of the present application;

[0020] Figure 2 This is a cross-sectional view of a sealing joint according to an optional embodiment of the present application.

[0021] The reference numerals indicate:

[0022] 1. Box body; 2. Heat exchange tube; 3. Sealing joint; 31. First sealing body; 32. Second sealing body; 4. First sealing structure; 5. Second sealing structure; 6. Observation window; 7. Oil drain hole; 8. Oil filling hole; 9. Vacuum hole. DETAILED DESCRIPTION

[0023] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0025] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0026] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0027] See also Figure 1 and Figure 2 As shown, according to one aspect of an embodiment of the present application, a gearbox is provided, including a box body 1, a heat exchange tube 2 and a sealing joint 3. The heat exchange tube 2 is arranged in the box body 1, one end of the sealing joint 3 is connected to the heat exchange tube 2, and the other end extends out of the box body 1 and is connected to an external pipeline.

[0028] It should be noted that in this application, by providing a sealing joint 3, one end of which connects the heat exchange tube 2 inside the housing 1 and the other end to the external pipeline, the problem of loose connection and easy leakage between the heat exchange tube 2 and the gearbox is effectively solved. This ensures that the fluid does not leak from the connection during the heat exchange process, improves the sealing performance of the entire system, and reduces energy loss and environmental pollution caused by leakage. At the same time, the good connection of the sealing joint 3 makes the heat exchange between the heat exchange tube 2 and the external pipeline smoother. It ensures that the heat exchange medium can flow efficiently between the interior of the housing 1 and the external pipeline, improving the efficiency of heat transfer. This helps to better control the operating temperature of the gearbox, extend the service life of the gears and other key components, and improve the performance and reliability of the gearbox. At the same time, by avoiding leakage problems, the gearbox is more stable during operation. Leakage will not cause pressure fluctuations or flow instability, thus ensuring the normal operation of the gearbox. At the same time, the reliability of the sealing joint 3 also reduces the need for frequent repairs due to leakage, reduces maintenance costs, and improves the overall stability of the system.

[0029] In some specific examples, gearboxes can be used in mining machinery, such as crushers, ball mills, and elevators. Gearboxes provide these devices with power transmission and speed regulation functions, adapting to different working conditions and load requirements. In other specific examples, gearboxes can be used in metallurgical equipment, such as rolling mills, continuous casting machines, and cranes. Gearboxes play a key transmission role in the metallurgical production process, ensuring stable operation and efficient production of the equipment. In addition, gearboxes can also be used in chemical equipment, such as mixers, centrifuges, and pumps. Gearboxes are used to drive various rotating equipment in chemical production to achieve material mixing, separation, and transportation.

[0030] The gearbox includes a housing 1 , which is the outer shell of the gearbox and provides space for installation and protection of various components inside the gearbox.

[0031] Specifically, the housing 1 may be a cast iron housing, a cast steel housing, an aluminum alloy housing, or a welded steel structure housing, etc., and this embodiment does not impose any further limitations. In this embodiment, the gearbox is applied to a pump, and the housing 1 is capable of withstanding the forces and vibrations generated during gear transmission while protecting the internal components from external environmental influences, such as dust, moisture, and other contaminants.

[0032] Heat exchange tubes 2 are installed within housing 1 to exchange heat between the interior and exterior of the gearbox. During gearbox operation, heat is generated by friction between the gears and the flow of lubricating oil. If this heat is not promptly dissipated, the gearbox will overheat, affecting the performance and lifespan of the gears and other components. A cooling medium, such as coolant or cooling gas, typically flows through heat exchange tubes 2. This heat is removed by exchanging heat with the hot air or hot oil within housing 1, thereby maintaining the internal temperature of the gearbox within a suitable range.

[0033] Specifically, the heat exchange tube 2 can be a straight tube heat exchange tube 2, a coil heat exchange tube 2, a finned tube heat exchange tube 2, a heat pipe heat exchange tube 2 or a combined heat exchange tube 2, etc., and this embodiment does not make further limitations.

[0034] Among them, the gearbox also includes a sealing joint 3, which serves to connect the heat exchange tube 2 and the external pipeline. One end is connected to the heat exchange tube 2 in the box body 1 to ensure the tightness of the connection and prevent leakage of the heat exchange medium. The other end extends out of the box body 1 and is connected to the external pipeline, so that the heat exchange medium can circulate between the heat exchange tube 2 and the external pipeline. It can be understood that a large amount of heat will be generated during the operation of the gearbox, and it needs to be cooled by coolant. The external pipeline can be a pipeline specially used to transport coolant, which transports the coolant from the cooling source (such as a cooling water tank, cooling tower, etc.) to the heat exchange tube 2 of the gearbox, absorbs heat, and then returns to the cooling source for cooling. This cycle is used to keep the gearbox working within a suitable temperature range.

[0035] Specifically, two sealing joints 3 can be provided, one sealing joint 3 is connected to the inlet of the heat exchange tube 2 , and the other sealing joint 3 is connected to the outlet of the heat exchange tube 2 .

[0036] In some possible implementations disclosed in this application, see Figure 2 As shown, a first groove is formed on the surface of the sealing joint 3 that contacts the box body 1 , and a first elastic pad is arranged in the first groove to form a first sealing structure 4 .

[0037] It should be noted that in the present application, a sealing line of defense is formed by providing a first groove on the surface of the sealing joint 3 in contact with the housing 1 and setting a first elastic pad. The first elastic pad can fit tightly against the housing 1 under pressure, preventing fluid from leaking from the connection between the sealing joint 3 and the housing 1, greatly improving the sealing performance of the entire system. Whether under the high-pressure environment inside the gearbox or under different pressure conditions in the external pipeline, it can effectively prevent the leakage of oil, coolant or other working media. At the same time, the first elastic pad can adapt to a certain degree of deformation. When the gearbox vibrates, experiences temperature changes, or is subjected to external impact during operation, the elastic pad can act as a buffer to maintain the stability of the seal. Even if there is a slight dimensional deviation or unevenness between the housing 1 and the sealing joint 3, the first elastic pad can compensate for it through its own deformation to ensure that the sealing effect is not affected.

[0038] The surface of the sealing joint 3 in contact with the box body 1 may be the outer peripheral wall of the sealing joint 3. In the installed state, the outer peripheral wall of the sealing joint 3 is in direct contact with the box body 1.

[0039] A first groove is provided on the outer peripheral wall of the sealing joint 3 , and the first groove may be an annular groove.

[0040] The first groove is provided with a first elastic pad, which can be an O-ring. For example, the first elastic pad can be a high-temperature resistant O-ring, a normal-temperature O-ring, or a low-temperature O-ring, which can be selected according to actual conditions.

[0041] Specifically, after the sealing joint 3 is fixed to the housing 1, the first elastic pad is compressed in the first groove. At this time, the first elastic pad generates a rebound force, which ensures that the first elastic pad always maintains close contact with the housing 1, maintaining the sealing performance even in the event of pressure fluctuations or vibrations.

[0042] In some possible implementations disclosed in this application, see Figure 2 As shown, the sealing joint 3 includes a first sealing body 31 and a second sealing body 32. The first sealing body 31 is connected to the second sealing body 32. The surface of the second sealing body 32 in contact with the first sealing body 31 is provided with a second groove. A second elastic pad is provided in the second groove to form a second sealing structure 5.

[0043] It should be noted that, in the present application, the sealing joint 3 is divided into a first sealing body 31 and a second sealing body 32. During the installation process, the two parts can be operated separately. Compared with the one-piece sealing joint 3, this split design is more flexible and easier to install on the gearbox housing 1 and the heat exchange tube 2. For example, in an installation environment with a relatively narrow space, the first sealing body 31 or the second sealing body 32 can be installed in place first, and then the two can be connected, which reduces the difficulty of installation. At the same time, a second sealing structure 5 is provided at the junction of the first sealing body 31 and the second sealing body 32, which can avoid leakage at the junction surface of the first sealing body 31 and the second sealing body 32, thereby enhancing the overall sealing performance of the sealing joint 3.

[0044] Among them, the first sealing body 31 is connected to the second sealing body 32, and the connection method can be threaded connection, snap connection or welding, etc., to ensure that the two can be tightly combined during the operation of the gearbox and jointly play a sealing role. This embodiment does not make further limitations.

[0045] The surface of the second sealing body 32 in contact with the first sealing body 31 may be an end surface of the second sealing body 32 on a side close to the first sealing body 31 .

[0046] A second groove is formed on the end surface of the second sealing body 32 on the side close to the first sealing body 31 , and the second groove may also be an annular groove.

[0047] The second groove is provided with a second elastic pad, which can also be an O-ring. For example, the second elastic pad can be a high-temperature resistant O-ring, a normal-temperature O-ring, or a low-temperature O-ring, which can be selected according to actual conditions.

[0048] Specifically, when the first sealing body 31 is connected to the second sealing body 32, the second elastic pad is placed in the second groove. Under the action of pressure, the second elastic pad is squeezed and deformed, filling the small gap between the first sealing body 31 and the second sealing body 32, thereby forming a second sealing structure 5. This sealing structure effectively prevents fluid leakage from the connection between the first sealing body 31 and the second sealing body 32, further improving the sealing performance of the sealing joint 3.

[0049] It can be understood that when the sealing joint 3 includes a first sealing body 31 and a second sealing body 32, the installation process of the sealing joint 3, the heat exchange tube 2 and the gear box is: first, fix the heat exchange tube 2 and the first sealing body 31; then, screw the second sealing body 32 into the mounting hole of the box body 1; finally, rotate the first sealing body 31 so that the male port of the second sealing body 32 is embedded in the female port of the first sealing body 31.

[0050] In some possible implementations disclosed in this application, see Figure 2 As shown, the first sealing body 31 is screwed to the second sealing body 32 .

[0051] It should be noted that in the present application, the first sealing body 31 and the second sealing body 32 are tightly coupled together through a threaded connection. The meshing action of the threads makes the connection between the two very secure, capable of withstanding large tension, pressure, and torque. During operation of the gearbox, the sealing joint 3 will not loosen or separate due to internal fluid pressure or external vibration, ensuring the stability of the seal. Furthermore, the threaded connection has a self-locking characteristic. Once tightened, the first sealing body 31 and the second sealing body 32 will not separate on their own unless a specific rotational force is applied. This is particularly important during the operation of the gearbox, as accidental separation can cause serious leakage accidents, affecting the performance and safety of the gearbox. Furthermore, the threaded connection makes the installation of the sealing joint 3 very convenient. Simply align the threads of the first sealing body 31 with the threads of the second sealing body 32, and then rotate them to achieve connection. This installation method does not require special tools or complex operations and can be easily completed even in limited space. Furthermore, the threaded connection also makes disassembly easy when the sealing joint 3 needs to be maintained or replaced. The first sealing body 31 and the second sealing body 32 can be separated by simply using a suitable tool, such as a wrench or a screwdriver, and rotating them in opposite directions. This greatly reduces the difficulty and time cost of maintenance.

[0052] The end of the first sealing body 31 close to the second sealing body 32 may be a female port, and the end of the second sealing body 32 close to the first sealing body 31 may be a male port. When the first sealing body 31 and the second sealing body 32 are connected, the male port of the second sealing body 32 can be inserted into the female port of the first sealing body 31.

[0053] Specifically, the female end of the first sealing body 31 is provided with an external or internal thread, and correspondingly, the male end of the second sealing body 32 is provided with a matching internal or external thread. When the sealing joint 3 is to be installed on the gearbox, the threads of the first sealing body 31 are gradually screwed into the threads of the second sealing body 32 by rotation, thereby achieving a tight connection between the two.

[0054] In some possible implementations disclosed in this application, see Figure 2 As shown, a mounting hole for passing the second sealing body 32 is opened on the box body 1, the hole wall of the mounting hole is an internal thread structure, the outer wall of the second sealing body 32 is an external thread structure, and the second sealing body 32 is connected to the mounting hole through the internal thread structure and the external thread structure.

[0055] It should be noted that in this application, the internally threaded mounting hole and the externally threaded second sealing body 32 are connected, allowing the sealing body to be securely fixed to the housing 1. During gearbox operation, even when affected by vibration, impact, or internal pressure fluctuations, the second sealing body 32 is unlikely to loosen or fall off, ensuring a stable connection between the sealing joint 3 and the housing 1. Furthermore, by rotating the second sealing body 32, the tightness of its connection to the mounting hole in the housing 1 can be precisely controlled. This helps ensure the sealing performance between the sealing joint 3 and the housing 1. The tightness can be adjusted as needed to accommodate different operating pressures and sealing requirements. Furthermore, the threaded connection can withstand large axial and radial forces, allowing the sealing joint 3 to reliably withstand pressure from the heat exchange tube 2 and external piping. This helps improve the overall load-bearing capacity of the gearbox and ensures its safe operation under various operating conditions. Furthermore, the threaded connection makes installation of the second sealing body 32 simple and quick. Simply align the external threads of the second sealing body 32 with the mounting hole in the housing 1 and rotate it to secure it in place. This installation method eliminates the need for complex tools or specialized installation equipment, reducing installation costs and complexity. Furthermore, the threaded connection facilitates disassembly when maintenance or replacement of the sealing joint 3 is necessary. Simply use a suitable tool, such as a wrench, and rotate the second sealing body 32 in the opposite direction to remove it from the housing 1. This significantly improves maintenance efficiency and reduces equipment downtime.

[0056] There may be two mounting holes, and the two mounting holes are provided in a one-to-one correspondence with the two sealing joints 3 .

[0057] The inner surface of the hole wall of the mounting hole is processed with spiral lines, and the outer surface of the second sealing body 32 also has thread-shaped lines, and these lines match the internal thread lines on the hole wall of the mounting hole.

[0058] Specifically, during installation, align the second sealing body 32 with the mounting hole and gradually screw it in. As the second sealing body 32 rotates, its external threads gradually engage with the internal threads of the mounting hole. During rotation, the threads gradually push the second sealing body 32 deeper into the mounting hole until it reaches the desired position, achieving a tight fit.

[0059] In some possible implementations disclosed in this application, see Figure 1 As shown, the tank body 1 is provided with an observation window 6, which is located at the lower part of the tank body 1 and is used to monitor the oil level.

[0060] It should be noted that in the present application, the observation window 6 is provided at the lower part of the housing 1, which enables the user to directly observe the oil level in the gearbox. Without the aid of other complex measuring tools, the amount of lubricating oil in the gearbox can be known at any time, ensuring that the lubricating oil is always at an appropriate level to ensure that the gears and other moving parts are adequately lubricated. In other words, the observation window 6 provides maintenance personnel with an intuitive monitoring method, reducing uncertainty in the maintenance process. When performing routine maintenance or troubleshooting, the observation window 6 can be used to quickly determine whether the oil level is normal, so that targeted inspections and repairs can be carried out. This greatly improves maintenance efficiency and reduces maintenance costs. At the same time, with the observation window 6, in many cases, unnecessary disassembly of the gearbox to check the oil level can be avoided. Frequent disassembly is not only time-consuming and labor-intensive, but may also affect the sealing performance and structural integrity of the gearbox. The presence of the observation window 6 allows maintenance personnel to understand the oil level without disassembling the housing 1, reducing interference with the gearbox.

[0061] The observation window 6 may be made of a material that is high-strength, corrosion-resistant, and has good transparency, such as pressure-resistant glass.

[0062] Specifically, the observation window 6 is located in the lower portion of the housing 1. The lower portion of the housing 1 is located near the gearbox's internal storage area for lubricating oil and other working media. During gearbox operation, important working media such as lubricating oil flow and accumulate within the housing 1. Over time and due to various factors, the level of these working media can change. Placing the observation window 6 in the lower portion of the housing 1 allows for more direct observation of the working media levels, particularly the lubricating oil level. Through the observation window 6, the operator can visually determine whether the lubricating oil level within the gearbox is at an appropriate level without opening the housing 1, allowing timely action such as adding lubricating oil or checking for leaks. Furthermore, the lower portion of the housing 1 is relatively stable and less susceptible to direct interference from the gearbox's internal moving parts. This position of the observation window 6 reduces interference with observation caused by factors such as the complex movements and airflow within the gearbox, improving the accuracy and reliability of observation.

[0063] In some possible implementations disclosed in this application, see Figure 1 As shown, an oil drain hole 7 is provided on the bottom surface of the box body 1, and the oil drain hole 7 is used to connect to an external oil guide pipe.

[0064] It should be noted that in the present application, when the lubricating oil in the gearbox needs to be replaced, the oil drain hole 7 can quickly drain the old oil. By connecting an external oil guide pipe, the old oil can flow smoothly into the collection container or treatment system, avoiding the residue of old oil inside the box body 1 and improving the efficiency of oil change. At the same time, when maintaining and inspecting the gearbox, it may be necessary to drain the oil in the box body 1. The provision of the oil drain hole 7 and the external oil guide pipe makes this process simple and quick, reducing the difficulty and time cost of the maintenance personnel. At the same time, it can also avoid oil splashing during the oil drainage process, keeping the working environment clean.

[0065] The oil drain hole 7 is roughly circular and is used to discharge the oil inside the box body 1.

[0066] Specifically, the oil drain hole 7 is provided on the bottom surface of the housing 1. After prolonged use, some oil may accumulate at the bottom of the housing 1. This accumulated oil may deteriorate, contaminate the internal environment of the gearbox, and even affect the normal operation of the gears and other components. The oil drain hole 7 provided on the bottom surface of the housing 1 allows this oil to be drained promptly, keeping the interior of the housing 1 clean.

[0067] The external oil guide pipe may be a metal hose, a plastic hard pipe, a rubber pipe or a composite pipe, etc., which is not further limited in this embodiment.

[0068] Specifically, the external oil guide pipe is connected to the oil drain hole 7. By connecting the external oil guide pipe, the discharged oil can be guided to a suitable treatment location to avoid the oil being directly discharged into the environment and causing pollution.

[0069] In some possible implementations disclosed in this application, see Figure 1 As shown, an oil filling hole 8 is opened on the top surface of the box body 1, and the oil filling hole 8 is used to connect an external oil filling device.

[0070] It should be noted that in the present application, the oil filling hole 8 is provided on the top surface of the housing 1, so that an external oil filling device can be easily connected thereto. The operator can directly insert the oil pipe of the oil filling device into the oil filling hole 8, and the gearbox can be filled with oil without complicated operations. In this way, the lubricating oil can be quickly and accurately injected into the interior of the housing 1, thereby improving the efficiency of refueling. At the same time, by connecting the external oil filling device through the oil filling hole 8, the sealing of the oil filling process can be ensured. Compared with other oil filling methods, such as directly pouring lubricating oil, this design can effectively avoid oil leakage, reduce waste and pollution to the environment. At the same time, it also reduces the risk of safety accidents such as fire caused by oil leakage. At the same time, the oil filling hole 8 is provided on the top surface of the housing 1, so that the operator can easily check the status of the oil filling hole 8 when performing maintenance and inspection. If problems such as blockage, damage or poor sealing of the oil filling hole 8 are found, they can be cleaned, repaired or replaced in time to ensure the normal operation of the oil filling system.

[0071] The oil filling hole 8 may be a circular hole for connecting an external oil filling device and serving as a passage between the external oil filling device and the interior of the box body 1 .

[0072] Specifically, oil filling port 8 is provided on the top surface of housing 1, which can be a flat surface facing the housing 1. Once an external oiling device is connected to oil filling port 8, an operator can activate the device to inject lubricating oil or other media into housing 1. The lubricating oil flows through oil filling port 8 into the gearbox's internal cavity, providing lubrication and cooling for the gears and other moving parts.

[0073] Among them, the external oil injection equipment can be various types of oil pumps, oil guns, oil injectors, etc. These devices usually have a certain pressure output capacity and can transport media such as lubricating oil to the oil injection hole 8 through a pipeline.

[0074] In some possible implementations disclosed in this application, see Figure 1 As shown, a vacuum hole 9 is provided on the top surface of the box body 1, and the vacuum hole 9 is used to connect an external vacuum device.

[0075] It should be noted that in this application, by connecting an external vacuum device and vacuuming the interior of the gearbox through vacuum hole 9, air, moisture, and other volatile substances within the gearbox body 1 can be effectively removed. If these gases and moisture remain in the gearbox, they will affect the performance of the lubricant and reduce its lubrication effectiveness. After removing them, the lubricant can better adhere to moving parts such as gears and bearings, reducing friction and wear, and improving the operating efficiency and lifespan of the gearbox.

[0076] The vacuum hole 9 may also be a circular hole for connecting to an external vacuum device.

[0077] Specifically, a vacuum hole 9 is also provided on the top surface of the housing 1. When the interior of the gearbox needs to be vacuumed, the pipe or connector of the external vacuum equipment is tightly connected to the vacuum hole 9 on the top surface of the housing 1. In this way, the external vacuum equipment can evacuate the interior space of the gearbox through the vacuum hole 9, reducing the air pressure in the housing 1 to a certain vacuum level.

[0078] The external vacuum equipment may be a device specifically used to create a vacuum environment, such as a vacuum pump.

[0079] Another aspect of the present application provides a Roots pump comprising any one of the gearboxes described above.

[0080] Roots pumps are vacuum pumps with high pumping rates, low operating noise, and excellent stability. They are widely used in the chemical, pharmaceutical, electronics, and metallurgical industries to extract various gases and create a vacuum environment. Roots pumps typically consist of a pump body, rotor, gearbox, and motor.

[0081] Among them, the gear box is installed on one side of the Roots pump and is connected to the rotor shaft of the Roots pump through a coupling or other transmission device.

[0082] Specifically, the gear box can be coupled to the pump body of the Roots pump by means of bolts.

[0083] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0084] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application. The above are merely preferred embodiments of the present application. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present application, and such improvements and variations shall also be considered within the scope of protection of the present application.

Claims

1. A gear box, characterized in that: include: Box (1); a heat exchange tube (2), the heat exchange tube (2) being arranged in the box (1); a sealing joint (3), one end of the sealing joint (3) being located inside the box (1) and connected to the heat exchange tube (2), and the other end extending out of the box (1) and connected to an external pipeline; A first groove is formed on the surface of the sealing joint (3) in contact with the box body (1), and a first elastic pad is provided in the first groove to form a first sealing structure (4); The sealing joint (3) comprises a first sealing body (31) and a second sealing body (32), wherein the first sealing body (31) is connected to the second sealing body (32), and a second groove is provided on a surface of the second sealing body (32) in contact with the first sealing body (31), and a second elastic pad is provided in the second groove to form a second sealing structure (5); The first sealing body (31) is screwed to the second sealing body (32).

2. The gearbox according to claim 1, characterized in that The box body (1) is provided with a mounting hole for passing the second sealing body (32); the hole wall of the mounting hole is an internal thread structure, the outer wall of the second sealing body (32) is an external thread structure, and the second sealing body (32) and the mounting hole are connected by the internal thread structure and the external thread structure.

3. The gearbox according to claim 1, characterized in that The box body (1) is provided with an observation window (6), which is located at the lower part of the box body (1) and is used to monitor the oil level.

4. The gearbox according to claim 1, characterized in that An oil drain hole (7) is provided on the bottom surface of the box body (1), and the oil drain hole (7) is used to connect to an external oil guide pipe.

5. The gearbox according to claim 1, characterized in that An oil filling hole (8) is provided on the top surface of the box body (1), and the oil filling hole (8) is used to connect to an external oil filling device.

6. The gearbox according to claim 1, characterized in that A vacuum hole (9) is also provided on the top surface of the box body (1), and the vacuum hole (9) is used to connect to external vacuum equipment.

7. A Roots pump, characterized in that: Comprising a gearbox as described in any one of claims 1-6.

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