Rotor pump with single-end-face mechanical seal

Abstract

The utility model relates to the field of glue solution pumping, in particular to a rotor pump with a single end face mechanical seal, which comprises a pump body, a main shaft and an auxiliary shaft, the main shaft and the auxiliary shaft are parallel to each other, the main shaft is connected with external power equipment, the main shaft and the auxiliary shaft are respectively provided with two synchronous rotors, the two rotors are positioned in an inner cavity of the pump body, and a gear box is arranged in the pump body. The rotor is driven by a pair of synchromesh gears arranged in the gear box, a front bearing and a rear bearing are mounted on two sides of each synchromesh gear, and the rotor is driven by the main shaft and the auxiliary shaft to synchronously rotate in opposite directions so as to change the volume of the pump; single-end-face mechanical sealing can be adopted in cooperation with structural improvement, high-viscosity glue liquid and low-viscosity glue liquid are not prone to leakage, pollution caused by chippings is not prone to being generated, and the service life is long.

Description

Technical Field

[0001] The utility model relates to the field of pumping glue liquid, in particular to a rotor pump with a single-end mechanical seal. Background Art

[0002] In the chemical production process, raw materials, semi-finished products and finished products are mostly liquids. Converting raw materials into semi-finished products and finished products requires a complex process. Pumps play a role in transporting liquids and providing pressure flow for chemical reactions in these processes. In addition, pumps are also used to regulate temperature in many devices.

[0003] Currently, liquid glue is typically pumped using a gear pump, which consists of a pair of meshing gears, a crescent-shaped element between them, and a pump housing. The crescent-shaped element separates the suction chamber from the discharge chamber. When the driving gear rotates, a partial vacuum is created where the gears disengage. Liquid is drawn into the pump, filling the spaces between the teeth of the suction chamber. Liquid then flows along the inner and outer sides of the crescent-shaped element into the discharge chamber.

[0004] Where the gear teeth mesh, the liquid between them is squeezed and sent into the discharge pipe. In addition to its self-priming capabilities and the fact that flow rate is independent of discharge pressure, gear pumps lack suction and discharge valves on the pump casing, resulting in simple structure, uniform flow rate, and reliable operation. However, these pumps are subject to low efficiency, high noise and vibration, and are prone to wear and tear, which can affect the quality of the adhesive. Furthermore, during operation, due to factors such as the meshing of the gears and the resistance to the flow of the adhesive, the adhesive exerts a force perpendicular to the gear axis, generating radial forces. This makes single-end mechanical seals unsuitable, and can easily lead to leakage when pumping low-viscosity adhesives.

[0005] In order to solve the above problems, the utility model provides a rotor pump with a single-end mechanical seal. Utility Model Content

[0006] The purpose of the utility model is to provide a rotor pump with a single-end mechanical seal to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A rotor pump with a single-end mechanical seal is a single-end mechanical seal structure. The rotor pump is provided with:

[0009] The variable frequency motor, the power equipment of the pump, can adjust the operating frequency according to actual production or canning needs to change the pump flow and pressure.

[0010] The gear reducer is connected to the variable frequency motor to match the speed between the motor and the pump shaft and rotor.

[0011] It also includes a main shaft, a counter shaft, and a synchronous gear. The main shaft is connected to the transmission mechanism of the pump through a coupling to achieve rotation. The two synchronous gears are installed on the main shaft and the counter shaft using shaft keys. The main shaft drives the counter shaft to rotate through the synchronous gear.

[0012] The rotor pump body, with a pair of three-lobed rotors mounted on the main and secondary shafts of the pump and built into the pump cavity, rotates synchronously in opposite directions during operation, causing the pump volume to change, thereby creating a high vacuum and discharge pressure. This is particularly suitable for conveying high and low viscosity adhesives. This enhances the shaft's bearing capacity and makes the pump run more stable and smooth, with low noise and low failure rate, thereby increasing the service life of the shaft and mechanical seal.

[0013] In addition, the rotor pump of the present application is also equipped with a built-in safety valve, which is connected to the pump chamber to set the pressure index and adjust the pressure according to actual production needs.

[0014] More optimally, there are six separately arranged bearings on both sides of the two synchronous gears to increase the concentricity of the pump during operation.

[0015] The two synchronous gears use shaft keys to replace the traditional expansion sleeve synchronization adjustment method, effectively preventing the expansion sleeve from slipping, solving the problem of collision between the rotors, and avoiding debris generated by collision between the rotors and contamination of the glue material.

[0016] The main and secondary shafts are optimized to be six times longer than ordinary shafts and are equipped with front and rear oil seal frames that can move back and forth on the shafts, thereby extending the service life of the shafts.

[0017] More optimally, the rotor is a three-lobed rotor, and the three-lobed rotor is provided with three wear-resistant surfaces, and the three wear-resistant surfaces are all arc-shaped and distributed in a regular triangle state.

[0018] Based on the traditional rotor, three wear-resistant surfaces are designed. The transition from line sealing to surface sealing increases the wear resistance of the rotor. A certain gap is maintained between the rotors, and there is no friction coefficient, which greatly improves the service life of the rotor.

[0019] More optimally, the viscosity of the conveying medium in the pump body is ≤1000000cp.

[0020] More optimally, a frequency converter is provided outside the pump body to adjust the pump flow according to actual production or canning needs, so that it can be used as a general metering pump.

[0021] More optimally, a heat preservation device or a cooling device is added to the pump casing to ensure that the glue reaches the designed process temperature during actual production operation.

[0022] More optimally, when used for single-end mechanical seals, a mechanical seal flushing system is added to achieve flushing and cooling of the single-end mechanical seal, thereby increasing the service life of the mechanical seal.

[0023] More optimally, the pump body and rotor are made of 316 material; the dynamic and static sealing rings of the single-end mechanical seal are made of perfluoroether material; the dynamic and static rings of the single-end mechanical seal are made of hard alloy; the pump body base is made of stainless steel 304, and the fixing parts are stainless steel bolts.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0025] This utility model provides ample space for the pump's mechanical seal installation, allowing for interchangeable use of multiple seals of the same model. The pump incorporates multiple seal mechanisms, including a single-end mechanical seal, which offers self-adjusting functionality and a long service life, making it a universal mechanical seal. Three separately arranged bearings on each of the main and secondary shafts enhance the pump's concentricity, strengthen the shaft's load-bearing capacity, and ensure smoother operation.

[0026] In this utility model, the shaft key is used to change the traditional expansion sleeve adjustment synchronization method, effectively preventing the expansion sleeve from slipping, solving the problem of collision between rotors, increasing the length of the shaft, allowing the sealing ring to move back and forth, thereby extending the service life of the shaft.

[0027] In the utility model, the single-end mechanical seal device equipped with an oil cup for lubrication can effectively prevent the mechanical seal from being damaged due to idling of the pump.

[0028] In the utility model, when conveying glue liquid, the gear pump is changed to a rotor pump. There is a certain gap between the pair of three-blade rotors, and there is no wear and contamination of the glue liquid between them. The synchronous gear uses a shaft key, which will not cause the rotor to collide. In addition, the rotor pump runs more smoothly, which greatly increases the service life of the pump.

[0029] In the utility model, the rotor pump adopts a single-end mechanical seal and is equipped with a single-end mechanical seal device lubricated by an oil cup, which can effectively lubricate the friction pair and prevent the mechanical seal from being damaged due to idling of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 The figure shows the overall pump chamber and the six bearings arranged separately on the pump shaft.

[0032] Figure 2 Schematic diagram of a pair of 316 three-blade rotors and their wear-resistant surfaces;

[0033] Figure 3 It is a cross-sectional schematic diagram of a single-end shaft seal device.

[0034] Among them, 1. rotating shaft; 3. mechanical seal seat; 4. static ring; 5. dynamic ring seat; 6. dynamic ring; 7. shaft sleeve; 8. pump body; 9. static ring seal; 10. convex ring; 11. dynamic ring first seal; 12. first gap; 13. dynamic ring second seal; 14. second gap; 15. countershaft; 16. rotor; 17. bearing; 18. synchronous gear; 19. main shaft; 20. mechanical seal structure. DETAILED DESCRIPTION

[0035] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0036] A rotor pump with a single end mechanical seal, such as Figure 1 As shown, it includes a pump body 8 and a pair of mutually parallel main shafts 19 and counter shafts 15. The main shaft 19 is connected to an external power device. Two synchronous rotors 16 are respectively installed on the main shaft 19 and the counter shaft 15. The two rotors 16 are located in the inner cavity of the pump body 8. A gear box is provided in the pump body 8. The rotors 16 are driven by a pair of synchronous gears 18 provided in the gear box. Front bearings 17 and rear bearings 17 are installed on both sides of the synchronous gears 18. The rotors 16 rotate synchronously in opposite directions driven by the main shaft 19 and the counter shaft 15 to change the volume of the pump.

[0037] Six bearings 17 are arranged separately on either side of the two synchronous gears 18 to increase the concentricity of the pump during operation. The main shaft 19 and countershaft 15 are six times longer than ordinary shafts and are equipped with front and rear oil seal frames that can move back and forth on the shaft.

[0038] like Figure 1 and Figure 2 As shown, rotor 16 is a three-lobed rotor 16 with three wear-resistant surfaces, all of which are arc-shaped and arranged in an equilateral triangle. In the present invention, the viscosity of the medium conveyed within pump body 8 is ≤ 1,000,000 cp. Furthermore, a frequency converter is provided on the exterior of pump body 8 to adjust the pump flow rate based on actual production or canning needs, allowing it to function as a general metering pump.

[0039] When necessary, a heat preservation device or cooling device can be added to the pump casing. When used for a single-end mechanical seal, a mechanical seal flushing system can be added to achieve flushing and cooling of the single-end mechanical seal.

[0040] The single-end mechanical seal structure 20 used in the present invention is as follows: Figure 3 As shown, it includes a machine seal seat 3, a static ring 4, a dynamic ring seat 5 and a dynamic ring 6 and a shaft sleeve 7 driven by it, all of which are cylindrical and are sleeved on the outside of the rotating shaft 1. The machine seal seat 3 is fixedly connected to the pump body 8, the shaft sleeve 7 is mounted on the outer surface of the rotating shaft 1 and is linked to the rotating shaft 1, the dynamic ring seat 5 is sleeved on the outside of the shaft sleeve 7 and is linked to the rotating shaft 1, the machine seal seat 3 is sleeved on the outside of the dynamic ring seat 5 and is fixedly connected to the pump body 8, the static ring 4 is located at the front end of the machine seal seat 3 and is directly sleeved on the outside of the shaft and is fixedly connected to the machine seal seat 3, and a static ring sealing ring 9 is provided in the gap between the static ring 4 and the machine seal seat 3.

[0041] The dynamic ring seat 5 is provided with a convex ring 10 for being fixedly connected to the shaft sleeve 7. The dynamic ring 6 is located in the space surrounded by the dynamic ring seat 5 and its convex ring 10 and the static ring 4, the rotating shaft 1 and the shaft sleeve 7. The lower end thereof is directly mounted on the outside of the shaft. The front of the dynamic ring 6 and the back of the static ring 4 are contact surfaces, which are tightly attached to each other to form a rotating pair. The rear end of the dynamic ring 6 is in a three-step shape of upper, middle and lower levels. A first gap 12 for setting the dynamic ring first sealing ring 11 is formed between the rear lower side of the dynamic ring 6 and the rotating shaft 1 and the front side of the shaft sleeve 7. A second gap 14 for setting the dynamic ring second sealing ring 13 is formed between the rear middle side of the dynamic ring 6 and the circumferential surface of the shaft sleeve 7. A compression spring is provided between the rear upper side of the dynamic ring 6 and the front side of the convex ring 10. When in use, at least one of the first gap 12 and the second gap 14 is provided with a corresponding dynamic ring first sealing ring 11 or dynamic ring second sealing ring 13.

[0042] The utility model mainly realizes continuous and pulse-free delivery of the glue liquid based on the relative movement between the cam rotor 16 and the pump housing.

[0043] When the pump is running, the rotor 16 pump usually consists of a pair of cam-shaped three-lobed rotors 16 that mesh with each other and rotate in a nearly elliptical pump chamber. A gap of 0.01mm-1mm is maintained between the rotors 16 and between the rotors 16 and the pump housing to allow the glue to pass through without leakage.

[0044] When the motor starts, after the speed is matched by the reducer, the coupling drives the main shaft 19 to rotate. The synchronous gear 18 mounted on the main shaft 19 drives the synchronous gear 18 on the countershaft 15 to rotate in the opposite direction, thereby driving the countershaft 15 to rotate synchronously in the opposite direction. Simultaneously, a pair of three-lobed rotors 16 mounted on the main and countershafts 15 and located within the pump cavity rotate synchronously in opposite directions, with the convex portion of one rotor 16 corresponding to the concave portion of the other rotor 16, thus forming sealed chambers. As the rotors 16 continue to operate, these chambers move axially along the pump body 8, drawing fluid from the inlet and delivering the adhesive to the outlet through compression. The special design of the rotors 16 ensures smooth flow and efficient delivery of the adhesive even at low variable speeds. The flow rate of a rotor 16 pump can be adjusted by adjusting the speed of the variable frequency motor or changing the tension of the built-in safety valve spring.

[0045] In order to solve the problems of large vibration, loud noise and easy wear when the gear pump conveys glue, a rotor 16 pump synchronous gear 18 uses a shaft key to replace the traditional expansion sleeve adjustment synchronization method, which effectively prevents the rotors 16 from colliding with each other due to the slipping of the expansion sleeve, thereby generating friction debris. At the same time, the rotor 16 pump main and auxiliary are respectively provided with three separately arranged bearings 17, which increases the concentricity of the pump operation, enhances the bearing capacity of the shaft and makes the pump operation more stable, effectively reduces the operating noise, and thus increases the service life of the shaft and machine seal.

[0046] A 16-rotor pump offers ample mechanical seal installation space, allowing for multiple seal configurations within a single pump. Multiple seals within the same model are interchangeable. Compared to the dual-face mechanical seals found in gear pumps, a 16-rotor pump utilizes a single-face mechanical seal. The four surfaces of the dynamic and static seals are constructed of cemented carbide, significantly enhancing the hardness of the friction pair. This provides exceptional resistance to wear, heat, corrosion, and cavitation, particularly in high-temperature environments. The dynamic and static seals are constructed of perfluoroether, which exhibits excellent chemical resistance, heat resistance, and homogeneity, ensuring a surface free from penetration, cracking, and pinholes, especially in corrosive, high-temperature environments. These features enhance sealing performance, extend operating cycles, and effectively reduce maintenance costs.

[0047] The single-end mechanical seal also features a seal-assisting system, the single-end mechanical seal flushing system. This system, connected in series, flushes both sets of mechanical seals in the cam rotor 16 pump, reducing maintenance costs. Furthermore, the single-end mechanical seal can be equipped with an oil cup lubricated unit, effectively preventing damage to the mechanical seal due to pump idling. This solves the problem of most existing single-end mechanical seals, which suffer from the difficulty of flushing and result in short service life and high maintenance costs. This significantly extends the service life of the single-end mechanical seal under the harsh operating conditions of the cam rotor 16 pump.

[0048] As long as the utility model rotor 16 pump and single end mechanical seal are used properly, the pump will have good stability and service life, and there will be no leakage between the shafts, no heat generation on the fitting surfaces of the dynamic and static rings 4, and the dynamic and static rings 4 will no longer be easily damaged.

[0049] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A rotor pump with a single-end mechanical seal, characterized in that: The invention comprises a pump body (8) and a pair of mutually parallel main shafts (19) and counter shafts (15), wherein the main shaft (19) is connected to an external power device, and two synchronous rotors (16) are respectively installed on the main shaft (19) and the counter shaft (15), and the two rotors (16) are located in the inner cavity of the pump body (8). A gear box is provided in the pump body (8), and the rotors (16) are driven by a pair of synchronous gears (18) provided in the gear box. A front bearing (17) and a rear bearing (17) are installed on both sides of the synchronous gear (18). The rotors (16) rotate synchronously in opposite directions driven by the main shaft (19) and the counter shaft (15), so as to change the volume of the pump.

2. A rotor pump with a single end mechanical seal according to claim 1, characterized in that: There are six bearings (17) arranged separately on both sides of the two synchronous gears (18) for increasing the concentricity of the pump during operation.

3. The rotor pump with a single mechanical seal according to claim 1, characterized in that: The main shaft (19) and the secondary shaft (15) are six times longer than ordinary shafts and are provided with a front oil seal skeleton and a rear oil seal skeleton. The front oil seal skeleton and the rear oil seal skeleton can move forward and backward on the shaft.

4. The rotor pump with a single end mechanical seal according to claim 1, characterized in that: The rotor (16) is a three-lobed rotor. The three-lobed rotor (16) is provided with three wear-resistant surfaces. The three wear-resistant surfaces are all arc-shaped and distributed in a regular triangle state.

5. The rotor pump with a single end mechanical seal according to claim 1, characterized in that: The viscosity of the conveying medium in the pump body (8) is ≤1,000,000 cp.

6. The rotor pump with a single mechanical seal according to claim 1, characterized in that: A frequency converter is provided outside the pump body (8) for adjusting the pump flow rate according to actual production or canning needs, so that the pump can be used as a general metering pump.

7. The rotor pump with a single mechanical seal according to claim 1, characterized in that: A heat preservation device or a cooling device is additionally provided in the pump casing.

8. The rotor pump with a single mechanical seal according to claim 7, characterized in that: When used for single-end mechanical seal, a mechanical seal flushing system is added to achieve flushing and cooling of the single-end mechanical seal.

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