Pump assembly

Abstract

The invention relates to a pump assembly. The pump assembly includes a housing, a motor, and a transfer shaft. The shell comprises a liquid shell part; the liquid shell part comprises a liquid cavity extending in the axial direction. The liquid cavity comprises a liquid outlet and a communicating hole which are oppositely arranged. The motor is connected with the shell on the side, away from the liquid outlet, of the shell. The motor includes a drive shaft extending in the axial direction. The transmission shaft is arranged in the liquid cavity and is connected with the driving shaft at one end of the communicating hole; the driving shaft is used for driving the transmission shaft to rotate; the transmission shaft is used for driving liquid in the liquid cavity to leave through the liquid outlet through rotation; wherein the liquid shell part is made of a non-metal material; and the transmission shaft accommodated in the liquid cavity is made of a non-metal material.

Description

Technical Field

[0001] The present application relates to the field of mechanical pumps, and in particular to a pump assembly. Background Art

[0002] In chemical production, screw pumps are key equipment for conveying corrosive liquids (such as acid and alkali solutions, organic solvents, and media containing chloride ions) due to their stable delivery, adaptability to high-viscosity media, and low-shear properties. However, these media place extremely high demands on the corrosion resistance of the pump material. Conventional screw pumps' liquid-contacting components (including the rotor, stator, pump casing, and seal chamber) must be entirely constructed of specialized alloys (such as duplex stainless steel 2205 / 2507, Hastelloy C-276, and titanium alloys) to resist chemical attack.

[0003] However, the solution of using corrosion-resistant metal for all the liquid-contacting parts of the screw pump will lead to high manufacturing costs and poor maintenance economy. Summary of the Invention

[0004] The present application provides a pump assembly to solve some or all of the deficiencies in the related art.

[0005] A pump assembly of the present application comprises:

[0006] The housing comprises a liquid shell portion; the liquid shell portion comprises a liquid cavity extending in an axial direction; the liquid cavity comprises a liquid outlet and a communication hole arranged opposite to each other;

[0007] a motor connected to the housing at a side of the housing away from the liquid outlet; the motor comprising a drive shaft extending along the axial direction; and

[0008] A transmission shaft is provided in the liquid chamber and connected to the drive shaft at one end of the communication hole; the drive shaft is used to drive the transmission shaft to rotate; the transmission shaft is used to drive the liquid in the liquid chamber to leave through the liquid outlet by rotating;

[0009] Wherein, the material of the liquid shell is a non-metallic material; the material of the transmission shaft accommodated in the liquid cavity is a non-metallic material.

[0010] Furthermore, the liquid shell includes a transition section and a suction section; the transition section is connected to the side of the suction section away from the liquid outlet; the suction section includes a liquid inlet; the liquid inlet is connected to the liquid cavity and is used to input fluid into the liquid cavity; the suction section and the transition section are made of different materials.

[0011] Furthermore, the material of the suction section is polyvinylidene fluoride; and / or the material of the transition section is polytetrafluoroethylene.

[0012] Furthermore, the end surface of the suction section facing the transition section is provided with a receiving groove; the receiving groove is communicated with the liquid cavity; the end surface of the transition section facing the suction section is provided with a receiving protrusion; the receiving protrusion cooperates with the receiving groove to form a receiving cavity whose opening is communicated with the liquid cavity; the pump assembly further includes:

[0013] The sealing structure includes a static sealing part; the static sealing part includes a third sealing ring; the third sealing ring is arranged in the accommodating cavity and has an interference fit with the accommodating groove; the size of the third sealing ring in the axial direction is smaller than the size of the accommodating cavity in the axial direction.

[0014] Furthermore, the liquid shell portion includes a suction section and a stator section; the stator section is connected to the side of the suction section facing the liquid outlet; the stator section includes a stator shell unit and a rubber stator arranged in the stator shell unit; the transmission shaft includes a screw section; the screw section is arranged at one end of the transmission shaft away from the motor; the rubber stator cooperates with the screw section to discharge the fluid in the liquid cavity through the liquid outlet when the transmission shaft rotates.

[0015] Furthermore, the liquid shell further comprises a discharge section; the discharge section is arranged on a side of the stator section away from the suction section; the liquid outlet is arranged in the discharge section;

[0016] The material of the discharge section is polyvinylidene fluoride, and / or;

[0017] The material of the discharge section is the same as that of the suction section.

[0018] Furthermore, the transmission shaft includes a transmission section connected to the motor and a connecting section connected between the transmission section and the screw section; the outer diameter of the connecting section is smaller than the outer diameter of the transmission section and the outer diameter of the screw section; the outer diameter of the transmission section is larger than the outer diameter of the screw section.

[0019] Furthermore, the transmission shaft is integrally formed; the material of the transmission shaft includes polyetheretherketone, graphite, carbon fiber and polytetrafluoroethylene.

[0020] Furthermore, the pump assembly further comprises:

[0021] The sealing structure includes a dynamic sealing part; the dynamic sealing part includes a static ring and a dynamic ring; the static ring and the dynamic ring are respectively sleeved on the transmission shaft; the static ring is connected to the inner wall of the shell; the dynamic ring abuts against the end face of the static ring facing the liquid outlet; the dynamic ring is connected to the transmission shaft and rotates with the transmission shaft; the material of the dynamic sealing part is non-metallic material.

[0022] Furthermore, the sealing structure also includes a limiting portion; the limiting portion is sleeved on the transmission shaft and is arranged at the end of the dynamic ring away from the static ring, for limiting the position of the dynamic sealing portion in the axial direction; the material of the limiting portion is non-metallic material.

[0023] Furthermore, the shell includes a connecting shell portion; one side of the connecting shell portion is connected to the liquid shell portion, and the other side is connected to the motor; the connecting shell portion includes a connecting cavity; the end of the transmission shaft away from the liquid outlet extends to the connecting cavity, and is connected to the drive shaft in the connecting cavity; the material of the connecting shell portion is metal.

[0024] The technical solutions provided by the embodiments of the present application may have the following beneficial effects:

[0025] As can be seen from the above embodiments, the liquid-contacting components of the pump assembly of the present application are all non-metallic, exhibiting excellent corrosion resistance, enabling the pump assembly to be used for pumping corrosive liquids. Furthermore, compared to metal materials, the liquid housing and transmission shaft of the pump assembly of the present application can effectively reduce the weight and processing costs of the pump assembly.

[0026] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 Shown is an overall schematic diagram of an embodiment of a pump assembly of the present application;

[0029] Figure 2 Shown as Figure 1 A schematic cross-sectional view of the pump assembly is shown;

[0030] Figure 3 Shown as Figure 2 An enlarged view of section A is shown;

[0031] Figure 4 A partially enlarged schematic diagram of an embodiment of the pump assembly of the present application is shown, with the liquid shell, the transmission shaft, and part of the motor hidden;

[0032] Figure 5 Shown is a partially enlarged schematic diagram of an embodiment of the housing of the present application;

[0033] Figure 6 Shown is an overall schematic diagram of an embodiment of a transmission shaft of the present application.

[0034] Description of reference numerals:

[0035] 100 pump assembly, 1 housing, 11 liquid shell, 111 liquid cavity, 1111 liquid outlet, 1112 communicating hole, 1112a sealing unit, 1112b abutting unit, 112 transition section, 1121 accommodating protrusion, 113 suction section, 1131 liquid inlet, 1132 accommodating groove, 114 stator section, 1141 stator shell unit, 1142 rubber stator, 115 discharge section, 116 accommodating cavity, 117 sealing cavity, 12 connecting shell, 121 connecting cavity, 13 body, 131 flange, 132 sealing protrusion, 2 motor, 21 driving shaft, 211 second jack, 3 transmission shaft, 31 transmission section, 31 1 driving hole, 312 first insertion hole, 313 boss, 32 connecting section, 33 screw section, 34 keyway, 4 sealing structure, 41 dynamic sealing part, 411 static ring, 412 dynamic ring, 42 static sealing part, 421 first sealing ring, 422 second sealing ring, 423 third sealing ring, 43 limiting part, 431 rubber ring, 4311 first end, 4312 second end, 4313 limiting hole, 4314 deformation section, 432 limiting member, 4321 protrusion, 44 limiting ring, 441 abutting end face, 442 matching protrusion, 443 matching groove, 44a first ring, 44b second ring, 5 pin, 6 sheath, Z axial direction. DETAILED DESCRIPTION

[0036] Here, the technical solutions in the embodiments (or "implementations") of the present application will be clearly and completely described in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0037] If there are terms related to directional indications or positional relationships in the embodiments of this application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first" and "second" in the embodiments of this application are only used for the purpose of convenience of description and should not be understood as indicating or implying relative importance.

[0038] refer to Figures 1 to 6The present application provides a pump assembly 100. The pump assembly 100 includes a housing 1, a motor 2, and a transmission shaft 3. The housing 1 includes a liquid shell portion 11. The liquid shell portion 11 includes a liquid cavity 111 extending along the axial direction Z. The liquid cavity 111 includes a liquid outlet 1111 and a connecting hole 1112 arranged opposite to each other. The motor 2 is connected to the housing 1 on a side of the housing 1 away from the liquid outlet 1111. The motor 2 includes a drive shaft 21 extending along the axial direction Z. The transmission shaft 3 is arranged in the liquid cavity 111 and is connected to the drive shaft 21 at one end of the connecting hole 1112. The drive shaft 21 is used to drive the transmission shaft 3 to rotate. The transmission shaft 3 is used to drive the liquid in the liquid cavity 111 to leave through the liquid outlet 1111 by rotation. Among them, the material of the liquid shell portion 11 is a non-metallic material. The material of the transmission shaft 3 accommodated in the liquid cavity 111 is a non-metallic material.

[0039] Liquid cavity 111 within liquid shell 11 is used to hold liquid. When pump assembly 100 is used in applications involving corrosive liquids, such as chemical, environmental, or oilfield applications, the non-metallic liquid shell 11 offers more economical corrosion resistance than metal, thereby preventing damage to pump assembly 100 from liquid corrosion after long-term use. Furthermore, the transmission shaft 3 housed within liquid cavity 111 is also non-metallic, thus ensuring that the power transmission components of pump assembly 100 also possess corrosion resistance.

[0040] The liquid-contacting components of the pump assembly 100 of the present application are all non-metallic and have excellent corrosion resistance, enabling the pump assembly 100 to be used for pumping corrosive liquids. Furthermore, compared to metal materials, the liquid housing 11 and transmission shaft 3 of the pump assembly 100 of the present application can effectively reduce the weight and processing costs of the pump assembly 100.

[0041] Figure 1 and Figure 2 The structure of the motor 2 shown is intended to be exemplary and not restrictive. The present application does not limit the specific size, shape, and drive parameters of the motor 2. Those skilled in the art can select appropriate parameters of the motor 2 based on the properties of the fluid pumped by the pump assembly 100. In addition, Figure 3 As shown, the communicating hole 1112 connects the liquid chamber 111 and the connecting chamber 121, and the connecting chamber 121 is defined by the connecting shell portion 12, and the liquid chamber 111 is defined by the liquid shell portion 11. Therefore, it is easy to understand that part of the communicating hole 1112 is located in the connecting shell portion 12, and another part of the communicating hole 1112 is located in the liquid shell portion 11.

[0042] Optionally, the housing 1 includes a connecting shell portion 12. One side of the connecting shell portion 12 is connected to the liquid shell portion 11 and the other side is connected to the motor 2. The connecting shell portion 12 includes a connecting cavity 121. One end of the transmission shaft 3 away from the liquid outlet 1111 extends to the connecting cavity 121, and is connected to the drive shaft 21 along the axial direction Z in the connecting cavity 121. Furthermore, the material of the connecting shell portion 12 is metal. Since the connecting shell portion 12 is used to connect the liquid shell portion 11 and the motor 2, and the connecting cavity 121 is not used to accommodate fluid, the pump assembly 100 has lower corrosion resistance requirements for the connecting shell portion 12 and higher connection strength performance requirements. The pump assembly 100 of the present application can effectively avoid corrosive fluid from overlooking the liquid shell portion 11 by setting the liquid shell portion 11 to non-metal and the connecting shell portion 12 to metal, and can also effectively ensure the stability of the connection of the connecting shell portion 12 to the liquid shell portion 11.

[0043] Alternatively, as Figure 1 and Figure 2 As shown, the connecting cavity 121 is connected to the outside at both ends perpendicular to the axial direction Z. Figure 2 In the illustrated embodiment, the connecting chamber 121 is in communication with the outside world at the left and right ends of the pump assembly 100. In other embodiments, the connecting chamber 121 may also be in communication with the outside world at the upper and lower ends of the pump assembly 100. This arrangement not only effectively reduces the weight of the connecting shell 12, but also improves the structural strength of the connecting shell 12, thereby facilitating the connection of the connecting shell 12 with the strength of the liquid shell 11 in the axial direction Z. In addition, the connecting chamber 121 in communication with the outside world can also assist assemblers in operating the connection between the drive shaft 21 and the motor 2 shaft through the connecting chamber 121, thereby facilitating assembly.

[0044] Combine Figure 2 and Figure 5In some optional embodiments, the liquid shell 11 includes a transition section 112 and a suction section 113. The transition section 112 is connected to the side of the suction section 113 away from the liquid outlet 1111. The suction section 113 includes a liquid inlet 1131. The liquid inlet 1131 is connected to the liquid cavity 111 and is used to input fluid into the liquid cavity 111. Among them, the materials of the suction section 113 and the transition section 112 are different. The suction section 113 is provided with a liquid inlet 1131, so the suction section 113 needs to be subsequently connected to a pipeline, etc., so as to introduce external fluid into the liquid cavity 111 for pumping. Since the suction section 113 needs to be connected to other components and also needs to withstand the force of the fluid rushing into the liquid cavity 111, the materials of the suction section 113 and the transition section 112 are set to be different, which can effectively reduce the overall cost of the pump assembly 100. For example, the suction section 113 can be made of a material with higher mechanical strength, while the transition section 112, which does not need to withstand the impact of the inflowing fluid, can be made of a material with lower mechanical strength than the suction section 113. In addition, the provision of the transition section 112 can increase the overall volume of the liquid chamber 111, thereby improving the pumping efficiency of the pump assembly 100.

[0045] In some optional embodiments, the material of the suction section 113 is polyvinylidene fluoride (PVDF). PVDF has excellent creep resistance and compressive strength, and is also highly corrosion-resistant. Therefore, when a corrosive fluid enters the liquid chamber 111 through the liquid inlet 1131 and generates fluid pressure and vibration, the suction section 113 made of PVDF can also reduce the risk of deformation, thereby increasing the service life of the pump assembly 100. In some optional embodiments, the material of the transition section 112 is polytetrafluoroethylene (PTFE). PTFE has better corrosion resistance, allowing the pump assembly 100 to be used for pumping highly corrosive fluids. In addition, the transition section 112 is located closer to the motor 2 than the suction section 113, so the heat generated by the operation of the motor 2 reaches the transition section 112 earlier than the suction section 113. The PTFE material has good high-temperature resistance, which can prevent the heat generated by the motor 2 from having a negative impact on the liquid shell 11, thereby increasing the service life of the liquid shell 11.

[0046] refer to Figure 2 In some optional embodiments, the liquid shell 11 includes a stator segment 114. The stator segment 114 is connected to the side of the suction section 113 facing the liquid outlet 1111. The stator segment 114 includes a stator shell unit 1141 and a rubber stator 1142 disposed in the stator shell unit 1141. Figure 6The transmission shaft 3 of the present application includes a transmission section 31, a connecting section 32 and a screw section 33. The transmission section 31 is used to connect to the drive shaft 21 of the motor 2. The connecting section 32 is connected between the transmission section 31 and the transition section 112. The screw section 33 cooperates with the rubber stator 1142 to discharge the fluid in the liquid chamber 111 through the liquid outlet 1111 when the transmission shaft 3 rotates. The rubber stator 1142 has corrosion resistance and can prevent the corrosive fluid in the liquid chamber 111 from corroding the stator. At the same time, the stator shell unit 1141 is not in direct contact with the corrosive fluid with the cooperation of the rubber stator 1142, so it can be set to a metal material to improve the structural strength of the liquid shell 11.

[0047] Of course, stator housing unit 1141 can also be made of a non-metallic material, thereby providing liquid shell portion 11 with more comprehensive corrosion resistance. This application does not limit this. The material of rubber stator 1142 can be fluororubber, hydrogenated nitrile rubber, ethylene propylene rubber, etc. These materials have certain corrosion resistance.

[0048] In the embodiment of the present application, the connecting section 32 and the screw section 33 of the transmission shaft 3 are both located in the liquid chamber 111. Therefore, the transmission shaft 3 is made of a non-metallic material at least in the connecting section 32 and the screw section 33, thereby effectively preventing corrosion of the transmission shaft 3 by corrosive fluids. Optionally, the transmission shaft 3 is integrally formed, that is, the connecting section 32, the screw section 33, and the transmission section 31 are all made of the same material. This arrangement is conducive to improving the structural strength and overall corrosion resistance of the transmission shaft 3, while also helping to reduce the number of components such as rotors and insert shafts required to connect the three sections of the transmission shaft 3.

[0049] Furthermore, the material of the transfer shaft 3 includes polyetheretherketone (PEEK), graphite, carbon fiber and polytetrafluoroethylene (PTFE). PTFE can withstand strong acids, strong bases and organic solvents, so that the transfer shaft 3 can have better chemical inertness and avoid corrosion. PEEK is also highly stable to common corrosive media such as hydrochloric acid and sulfuric acid, and further improves the corrosion resistance range of the transfer shaft 3 after being compounded with PTFE. Carbon fibers can be evenly distributed in the transfer shaft 3 at the microscopic level, thereby preventing corrosive fluids from penetrating into the interior of the transfer shaft 3, thereby delaying the corrosion of the transfer shaft 3 by the corrosive liquid. Graphite is more stable in a non-oxidizing environment and can enhance the overall acid and alkali resistance. It can be seen that the transfer shaft 3 formed by the above-mentioned material combination can have more stable chemical inertness, thereby improving the service life of the transfer shaft 3 immersed in corrosive fluids.

[0050] Optionally, the content of polyetheretherketone is greater than or equal to 60% and less than or equal to 80%. The content of graphite is greater than or equal to 8% and less than or equal to 12%. The content of carbon fiber is greater than or equal to 8% and less than or equal to 12%. The content of polytetrafluoroethylene is greater than or equal to 8% and less than or equal to 12%. In other words, the main matrix material of the transmission shaft 3 is PEEK. The high proportion of PEEK makes the transmission shaft 3 have a higher strength structure and better heat resistance. Graphite, carbon fiber and PTFE can provide effects such as enhanced rigidity and improved toughness, so that the transmission shaft 3 can have better transmission characteristics and a longer service life.

[0051] It should be noted that the content range of the materials of the transmission shaft 3 can fully meet the above-mentioned content ratio. Alternatively, the transmission shaft 3 can also be made of only one, two or three materials that meet the above-mentioned content ratio range.

[0052] Returning to the description of the liquid shell 11, in some optional embodiments, the liquid shell 11 further comprises a discharge section 115. The discharge section 115 is arranged on the side of the stator segment 114 away from the suction section 113. The liquid outlet 1111 is arranged in the discharge section 115. The material of the discharge section 115 is polyvinylidene fluoride (PVDF). As mentioned above, PVDF has excellent creep resistance and compressive strength, and is also highly corrosion-resistant, so that the discharge section 115 has good corrosion resistance and deformation resistance. Alternatively, the material of the discharge section 115 is the same as that of the suction section 113. The suction section 113 is provided with a liquid inlet, and when the fluid enters the liquid cavity 111 from the liquid inlet, the fluid causes a pressure change in the suction section 113. The fluid leaves the liquid cavity 111 at the liquid outlet 1111 of the discharge section 115, so there is also a fluid pressure change in the discharge section 115. Therefore, setting the material of the discharge section 115 to be the same as that of the suction section 113 can reduce the material requirements of the liquid shell 11 and thus control the production cost.

[0053] Since the liquid shell 11 includes multiple areas along the axial direction Z, the length of the transfer shaft 3 along the axial direction Z should also be set accordingly. The screw segment 33 of the transfer shaft 3 is used to drive the fluid out of the liquid chamber 111. The transfer segment 31 is connected to the drive shaft 21. Therefore, the connecting segment 32 actually only serves to connect the transfer segment 31 and the screw segment 33. In some optional embodiments, the outer diameter of the connecting segment 32 is smaller than the outer diameter of the transfer segment 31 and the outer diameter of the screw segment 33. The outer diameter of the connecting segment 32 is the smallest, so the flexibility of the transfer shaft 3 at the position of the connecting segment 32 is better, which is conducive to absorbing the axial deviation of the drive shaft 21 and the screw segment 33, and avoiding stress concentration caused by rigid connection.

[0054] like Figure 3 and Figure 6As shown, in order to achieve the connection between the transmission shaft 3 and the drive shaft 21, in some embodiments, the end of the transmission section 31 away from the screw section 33 includes a drive hole 311 recessed along the axial direction. The drive shaft 21 is accommodated in the drive hole 311. The cross-section of the drive hole 311 is non-circular. The drive hole 311 of this embodiment can cooperate with the non-cylindrical drive shaft 21, and the shape matching of the drive shaft 21 and the drive hole 311 can avoid the relative rotation of the drive shaft 21 and the transmission shaft 3 around the axis of rotation. Alternatively, the transmission section 31 also includes a first jack 312 that passes through the transmission section 31 perpendicular to the axial direction. As shown Figure 3 As shown, in this embodiment, the drive shaft 21 includes a second socket 211 extending perpendicularly through the drive shaft 21. The pump assembly 100 also includes a latch 5. The latch 5 is inserted into the first socket 312 and the second socket 211. The provision of the latch 5 can limit relative movement between the drive end and the drive shaft 21 about the rotation axis and relative movement along the axial direction Z. The drive hole 311 of this embodiment is simple to manufacture and can be adapted to a variety of different motors 2, which helps reduce the subsequent maintenance and repair costs of the pump assembly 100.

[0055] Since the pump assembly 100 is usually placed in such a way that the axial direction Z is parallel to the horizontal plane, the latch 5 inserted into the first and second sockets 312, 211 may be parallel to the direction of gravity under certain conditions. In this case, the latch 5 may be separated from the first and second sockets 312, 211 under the action of gravity. In order to solve this problem, the latch 5 can actually be an interference fit with at least one of the first and second sockets 312, 211. Alternatively, as Figure 1 and Figure 3 As shown, the pump assembly 100 may include a sheath 6. The sheath 6 is coated on the outer periphery of the transmission section 31. The sheath 6 is interference fit with the transmission section 31 and covers the first socket 312. Through such an arrangement, the sheath 6 can keep the pin 5 in the first socket 312, thereby preventing the drive shaft 21 and the transmission shaft 3 from relative movement around the axial direction. At the same time, the sheath 6 covering the outer periphery of the transmission section 31 can also serve to shield the pin 5. This not only improves the aesthetics of the pump assembly 100, but also prevents possible splashing of corrosive fluid from damaging the pin 5, the transmission section 31 and the drive shaft 21.

[0056] In the embodiment where both ends of the connecting cavity 121 are open to the outside world, the open connecting cavity 121 allows assemblers to easily insert the latch 5 and install the sheath 6 from both ends of the connecting cavity 121, facilitating operation and improving assembly efficiency. Furthermore, the open connecting cavity 121 allows workers to easily observe the connection between the drive shaft 21 and the transmission shaft 3, allowing them to take timely maintenance measures if the two become disconnected.

[0057] In other embodiments, the drive shaft 21 may include a hole structure into which the transfer shaft 3 can be inserted. However, to prevent the torque generated by the drive shaft 21 from affecting the operation of the transfer shaft 3, in some optional embodiments, the outer diameter of the transfer section 31 is greater than the outer diameter of the screw section 33. Because the outer diameters of the transfer section 31 and the screw section 33 are respectively greater than the connecting section 32, in this embodiment, the outer diameter of the transfer section 31 is the largest. The increased outer diameter of the transfer section 31 can improve the structural strength of the transfer section 31, thereby being able to withstand the torque generated by the rotation of the drive shaft 21 and avoid damage.

[0058] Combine Figure 2 、 Figure 3 and Figure 5 The housing 1 includes a connecting hole 1112 connecting the liquid chamber 111 and the connecting chamber 121, so that the transmission shaft 3 can enter the liquid chamber 111 after connecting the drive shaft 21 from the connecting chamber 121. Since the fluid is stored in the liquid chamber 111, the fluid tends to flow out of the liquid chamber 111 from the connecting hole 1112. In order to achieve the sealing of the fluid in the liquid chamber 111 and ensure that the fluid leaves the liquid chamber 111 from the side of the liquid outlet 1111, the pump assembly 100 of the present application also includes a sealing structure 4. The sealing structure 4 is sleeved on the outer periphery of the transmission shaft 3. The sealing structure 4 is arranged in the connecting hole 1112 to prevent the fluid in the liquid chamber 111 from entering the connecting chamber 121 through the connecting hole 1112. Among them, the sealing structure 4 includes a dynamic sealing part 41 and a static sealing part 42.

[0059] The dynamic sealing portion 41 forms an extremely thin liquid film to achieve sealing as it rotates with the transmission shaft 3, thereby preventing the fluid in the liquid cavity 111 from leaking along the transmission shaft 3 to the connecting cavity 121, and also preventing external air or other media from entering the liquid cavity 111 through the connecting hole 1112. The static sealing portion 42 can prevent the fluid from leaking through the static connecting surface, ensuring that the fluid can only flow in the designed flow channel. The combination of the dynamic sealing portion 41 and the static sealing portion 42 can achieve fluid sealing of the liquid cavity 111 through a variety of different sealing methods, thereby improving the sealing degree of the pump assembly 100 for corrosive fluids, and further improving the service life and safety of the pump assembly 100.

[0060] It should be understood that the description herein of the sealing structure 4 being sleeved on the transmission shaft 3 should be understood as the sealing structure 4 surrounding the outer circumference of the transmission shaft 3, and may be in direct contact with the transmission shaft 3 or spaced radially apart from the transmission shaft 3. The sealing structure 4 being sleeved on the outer circumference of the transmission shaft 3 should be understood as being in direct contact with the outer circumferential surface of the transmission shaft 3. This description is not limited to the fit between the sealing structure 4 and the transmission shaft 3 but can also be applied to describing the positional relationship between the sealing structure 4 and any other structure of the pump assembly 100.

[0061] refer to Figure 3The dynamic sealing part 41 includes a static ring 411 and a dynamic ring 412 which are sleeved on the transmission shaft 3. In some optional embodiments, the static ring 411 is connected to the inner wall of the shell 1. The dynamic ring 412 abuts against the end face of the static ring 411 facing the liquid outlet 1111. The dynamic ring 412 is connected to the transmission shaft 3 and rotates with the transmission shaft 3. If the connecting hole 1112 is understood as the leakage side at this time, then the dynamic ring 412 of this embodiment is placed on the side of the static ring 411 away from the leakage side, and on the side of the static ring 411 away from the leakage side, a liquid film is formed by relative rotation with the static ring 411 to avoid fluid leakage. In this way, the sealed liquid film can be formed at a position as far away from the leakage side as possible, thereby avoiding the fluid from leaving the liquid chamber 111 directly through the connecting hole 1112 when the dynamic sealing part 41 fails.

[0062] Since the static sealing ring remains stationary, the transmission shaft will rotate relative to the static sealing ring around the axis during rotation. To avoid friction between the static sealing ring and the transmission shaft, a gap exists between the static sealing ring and the transmission shaft. The dynamic sealing ring abuts the end face of the static sealing ring facing the liquid outlet 1111, so the dynamic sealing ring can prevent the fluid from flowing from the end face of the static sealing ring through the outer periphery of the dynamic sealing ring into the gap between the static sealing ring and the transmission shaft. However, in order to ensure the sealing effect of the pump assembly 100 at the position of the connecting hole 1112, the pump assembly 100 needs to prevent the fluid from entering the connecting hole 1112 and leaving the liquid cavity 111 through the gap between the static sealing ring and the housing 1. In some optional embodiments, the static sealing portion 42 includes a first sealing ring 421. The first sealing ring 421 is sleeved on the outer periphery of the static ring 411. The first sealing ring 421 is interference fit with the inner wall of the housing 1. The first sealing ring 421 is sleeved on the outer periphery of the static ring 411. The first sealing ring 421 is sleeved on the outer periphery of the static ring 411 and has an interference fit with the inner wall of the housing 1. Therefore, the inner wall of the housing 1 squeezes the first sealing ring 421 against the outer periphery of the static ring 411 and causes deformation. In this way, the first sealing ring 421 can prevent the fluid from leaving the liquid chamber 111 through the gap between the first sealing ring 421 and the static ring 411, and the gap between the first sealing ring 421 and the housing 1. It can be seen that the cooperation between the dynamic ring 412 and the first sealing ring 421 can achieve dynamic and static sealing at the position of the static ring 411, so that the static ring 411 arranged near the connecting hole 1112 can achieve better sealing. Compared with the interference fit between the static ring 411 and the housing 1, the arrangement of the first sealing ring 421 reduces the processing precision requirements for the static ring 411 and the housing 1, and can be easily replaced, thereby ensuring the sealing effect of the pump assembly 100.

[0063] The movable ring 412 and the transmission shaft 3 can also be interference fit, so that liquid cannot enter the gap between the movable ring 412 and the transmission shaft 3, and the movable ring 412 can rotate with the transmission shaft 3. Alternatively, in some optional embodiments, the sealing structure 4 includes a limiting portion 43. The limiting portion 43 includes a rubber ring 431 that is sleeved on the transmission shaft 3. The rubber ring 431 includes a first end 4311 facing the liquid outlet 1111 and a second end 4312 facing the connecting hole 1112. The first end 4311 is interference fit with the transmission shaft 3. The rubber ring 431 includes a limiting hole 4313 provided at the second end 4312. The movable ring 412 is provided in the limiting hole 4313 and is interference fit with the limiting hole 4313. There is a gap between the movable ring 412 and the surface of the transmission shaft 3. The material of the rubber ring 431 has a certain degree of corrosion resistance, and therefore can be used in the pump assembly 100 for pumping corrosive fluids. The material of rubber ring 431 imparts a certain degree of elasticity and deformability, making it easier for assemblers to assemble first end 4311 with transmission shaft 3 using an interference fit, and to assemble dynamic ring 412 into retaining hole 4313 using an interference fit. Compared to an interference fit between dynamic ring 412 and transmission shaft 3, this arrangement effectively reduces the machining precision requirements for dynamic ring 412 and transmission shaft 3, thereby controlling production costs. Furthermore, the interference fit between first end 4311 and transmission shaft 3 prevents fluid from entering the gap between rubber ring 431 and transmission shaft 3 from the first end 4311. The dynamic ring 412, located at the second end 4312, abuts against the stationary ring 411, forming a dynamic seal. Therefore, despite the gap between the surfaces of dynamic ring 412 and transmission shaft 3, fluid is unlikely to enter the gap between dynamic ring 412 and transmission shaft 3 through the second end 4312 of rubber ring 431. It can be seen that the provision of the rubber ring 431 can further improve the fluid sealing effect at the position of the dynamic ring 412 .

[0064] Combine Figure 3 and Figure 6Although the first end 4311 of the rubber ring 431 is interference fit with the transmission shaft 3, in order to prevent the rubber ring 431 and the transmission shaft 3 from moving relative to each other in the axial direction Z due to long-term use of the pump assembly 100, in some optional implementations, the limiting portion 43 also includes a limiting member 432 that is adsorbed and connected to the first end 4311 of the rubber ring 431. The transmission shaft 3 includes a keyway 34. The limiting member 432 includes a protrusion 4321 that cooperates with the keyway 34. The protrusion 4321 cooperates with the keyway 34 to allow the transmission shaft 3 to drive the limiting member 432 to rotate. The limiting member 432 is used to limit the position of the rubber ring 431 and the dynamic sealing portion 41 in the axial direction Z, and to apply a force to the rubber ring 431 from the liquid outlet 1111 to the direction of the connecting hole 1112. The flexibility of the rubber ring 431 enables it to be stably adsorbed to the limiter 432 under the action of fluid pressure, thereby maintaining the relative positional relationship between the rubber ring 431 and the limiter 432 along the axial direction Z. The cooperation between the keyway 34 and the protrusion 4321 enables the rubber ring 431 to remain relatively stationary around the rotation axis and rotate with the transmission shaft 3. In addition, because the first end 4311 of the rubber ring 431 is adsorbed to the limiter 432, the rubber ring 431 forms multiple sealing surfaces: the adsorption surface between the first end 4311 and the limiter 432, which is perpendicular to the axial direction Z, and the contact surface between the rubber ring 431 and the transmission shaft 3, which is parallel to the axial direction Z. The cooperation between the rubber ring 431 and the limiter 432 can further prevent fluid from entering the gap between the rubber ring 431 and the transmission shaft 3.

[0065] Combine Figure 3 and Figure 6 Optionally, one end of the transmission section 31 facing the connection section 32 includes a boss 313 . The end surface of the boss 313 away from the connection section 32 is used to abut against the sealing structure 4 of the pump assembly 100 .

[0066] Optionally, the rubber ring 431 includes a deformable section 4314 disposed between a first end 4311 and a second end 4312. The size of the deformable section 4314 in the axial direction Z can be changed to change the distance between the first end 4311 and the second end 4312 in the axial direction Z. At least part of the deformable section 4314 is spaced apart from the wall surface of the transmission shaft 3. The space between the deformable section 4314 and the wall surface of the transmission shaft 3 allows the deformable section 4314 to have sufficient space to move toward or away from the transmission shaft 3 when the size of the deformable section 4314 in the axial direction Z decreases, thereby increasing the feasible deformation of the deformable section 4314. The rubber ring 431 needs to maintain the first end 4311 in contact with the limit member 432 and the second end 4312 to maintain the dynamic ring 412 in contact with the static ring 411. Therefore, the rubber ring 431 actually needs to meet certain dimensional requirements in the axial direction Z. The provision of the deforming section 4314 enables the stopper 432 to apply a force directed from the liquid outlet 1111 toward the connecting hole 1112 to the rubber ring 431 when assembled on the transmission shaft 3, thereby maintaining the dynamic ring 412 in contact with the static ring 411. When the dynamic ring 412 and the static ring 411 are in contact, the deforming section 4314 deforms, allowing the stopper 432 to be assembled into place. After assembly, the deforming section 4314 tends to return to its original state, thereby maintaining the force applied from the liquid outlet 1111 toward the connecting hole 1112 to the static ring 411 and the force applied from the connecting hole 1112 toward the liquid outlet 1111 to the stopper 432, thereby maintaining the sealing performance of the sealing structure 4.

[0067] Combine Figure 3 and Figure 4, optionally, the sealing structure 4 also includes a limiting ring 44. The limiting ring 44 includes an abutting end face 441 and a plurality of mating protrusions 442. The mating protrusions 442 are arranged on the side of the limiting ring 44 away from the abutting end face 441. A mating groove 443 of the limiting ring 44 is formed between adjacent mating protrusions 442. The limiting ring 44 is interference fit with the rubber ring 431 on the side of the rubber ring 431 away from the transmission shaft 3. Among them, the limiting ring 44 includes two, namely a first ring 44a and a second ring 44b. The abutting end face 441 of the first ring 44a is set toward the first end 4311. The end face of the second ring 44b is set toward the second end 4312. The mating protrusion 442 of the first ring 44a is inserted into the mating groove 443 of the second ring 44b, and then the mating protrusion 442 of the second ring 44b is inserted into the mating groove 443 of the first ring 44a. When the deformation section 4314 is not deformed, there is a gap between the first ring 44a and the second ring 44b in the axial direction Z. The rubber ring 431 needs to have an interference fit with the transmission shaft 3, so the limiting ring 44 is sleeved on the outer periphery of the rubber ring 431 and the interference fit with the rubber ring 431 can cause the rubber ring 431 to deform perpendicular to the axial direction Z. In this way, the rubber ring 431 has a tendency to return to its original shape, and then continuously applies pressure directed toward the transmission shaft 3 to maintain a close fit with the transmission shaft 3. And because the limiting ring 44 makes the rubber ring 431 have a tendency to continuously apply pressure to the transmission shaft 3, the setting of the limiting ring 44 can prevent the rubber ring 431 and the transmission shaft 3 from being displaced in the axial direction Z, thereby playing the role of axial limiting.

[0068] Furthermore, the first ring 44a and the second ring 44b cooperate so that when the mating grooves 443 of the first ring 44a and the mating protrusions 442 of the first ring 44a and the second ring 44b abut against each other, the rubber ring 431 can no longer deform along the axial direction Z. Therefore, the first ring 44a and the second ring 44b can also be used to control the minimum distance between the first end 4311 and the second end 4312.

[0069] In some optional embodiments, the material of the limiting ring 44 is polyetheretherketone (PEEK). As mentioned above, PEEK has good chemical corrosion resistance, so the limiting ring 44 located in the liquid cavity 111 can avoid corrosion caused by corrosive fluids. And the limiting ring 44 made of PEEK material has high mechanical strength and dimensional stability, thereby keeping the rubber ring 431 pressed against the transmission shaft 3 without loosening. In addition, the PEEK material makes the limiting ring 44 lightweight, thereby reducing the dynamic balance burden when the transmission shaft 3 rotates. Compared with the common spring and corrosion-resistant metal structures, the limiting rings 44 of the present application can cooperate in pairs, reducing the production quantity of parts and the material cost of production. Indeed, in other embodiments, the limiting ring 44 can also be other non-metallic materials.

[0070] In each of the above-mentioned embodiments, the dynamic ring 412 and the static ring 411 can also be configured to be made of non-metallic materials, thereby improving the chemical corrosion resistance of the dynamic sealing portion 41. In some embodiments, the dynamic ring 412 is a silicon carbide dynamic ring 412. The static ring 411 is a silicon carbide static ring 411. Silicon carbide has good chemical corrosion resistance, so the dynamic sealing portion 41 can be disposed in a liquid cavity 111 containing a corrosive fluid, thereby preventing the corrosive fluid from corroding the dynamic ring 412 and the static ring 411 and causing seal failure. In addition, silicon carbide has good wear resistance, so damage can be avoided when the dynamic ring 412 and the static ring 411 rotate relative to each other, thereby maintaining the service life of the dynamic sealing portion 41.

[0071] Combine Figure 3 and Figure 5 Optionally, the communicating hole 1112 includes a sealing unit 1112a and an abutting unit 1112b provided in the liquid shell portion 11. The abutting unit 1112b is provided between the sealing unit 1112a and the connecting chamber 121. The aperture of the sealing unit 1112a is larger than the aperture of the liquid chamber 111 and smaller than the aperture of the abutting unit 1112b. In other words, in the direction from the connecting chamber 121 to the liquid chamber 111, the apertures of the abutting unit 1112b, the apertures of the sealing unit 1112a, and the apertures of the liquid chamber 111 decrease in sequence. The housing 1 also includes a housing portion 13. One end of the housing portion 13 includes a flange 131. The flange 131 abuts against the abutting unit 1112b. The end of the housing portion 13 away from the flange 131 extends into the connecting chamber 121. The transmission shaft 3 passes through the housing portion 13. The dynamic sealing portion 41 is provided on the side of the housing portion facing the transmission shaft 3. The static seal 42 is located in the sealing unit 1112a. The arrangement of the housing 13 facilitates the assembly and connection of the dynamic seal 41, the connecting shell 12, and the transmission shaft 3. When assembling the pump assembly 100, the assembler first connects the dynamic seal 41 to the transmission section 31, then places the transmission shaft 3 in the liquid chamber 111 and fits the housing 13 over the transmission shaft 3. After connecting the transmission section 31 to the drive shaft 21, the housing 13 is connected to the connecting shell 12, thereby sealing the liquid chamber 111. The static seal 42 is located in the sealing unit 1112a, preventing fluid in the liquid chamber 111 from escaping through the gap between the housing 13 and the liquid shell 11. Furthermore, the stepped arrangement of the sealing unit 1112a and the abutment unit 1112b, along with the flange 131, increases the number of sealing surfaces of the housing 13, further ensuring the fluid-tightness of the pump assembly 100.

[0072] Combine Figure 4 and Figure 5In some optional embodiments, the end surface of the body portion 13 facing the liquid chamber 111 includes a sealing protrusion 132. The sealing protrusion 132 cooperates with the sealing unit 1112a to form a sealing chamber 117 whose opening is connected to the liquid chamber 111. The static sealing portion 42 includes a second sealing ring. The second sealing ring is arranged in the sealing chamber 117 and has an interference fit with the wall surface of the sealing unit 1112a. The size of the second sealing ring in the axial direction Z is smaller than the size of the sealing chamber 117 in the axial direction Z. The provision of the sealing protrusion 132 can reduce the flow area of ​​the fluid flowing from the liquid chamber 111 into the sealing chamber 117, thereby reducing the possibility of fluid leakage. After the fluid enters the sealing chamber 117, the second sealing ring can play a role of static sealing, thereby further reducing the possibility of leakage at the position of the body portion 13.

[0073] Because the side of the housing 13 facing the liquid chamber 111 is likely to come into contact with the fluid within the liquid chamber 111, the housing 13 also needs to possess a certain degree of chemical resistance. In some optional embodiments, the housing 13 is made of polytetrafluoroethylene (PTFE). PTFE is resistant to strong acids, strong bases, and organic solvents, making the transmission shaft 3 more chemically inert and corrosion-resistant. PTFE's excellent high-temperature resistance prevents the heat generated by the motor 2 from negatively impacting the housing 13, thereby extending the service life of the liquid shell 11.

[0074] Continue to refer Figure 4 Similarly, in some embodiments where the liquid shell portion 11 includes an intake section 113 and a transition section 112, a receiving groove 1132 is provided on the end surface of the intake section 113 facing the transition section 112. The receiving groove 1132 is connected to the liquid chamber 111. A receiving protrusion 1121 is provided on the end surface of the transition section 112 facing the intake section 113. The receiving protrusion 1121 cooperates with the receiving groove 1132 to form an receiving chamber 116 whose opening is connected to the liquid chamber 111. In this embodiment, the static sealing portion 42 includes a third sealing ring 423. The third sealing ring 423 is disposed in the receiving chamber 116 and has an interference fit with the receiving groove 1132. The dimension of the third sealing ring 423 in the axial direction Z is smaller than the dimension of the receiving chamber 116 in the axial direction Z. With this arrangement, the connection between the intake section 113 and the transition section 112 can form a fluid-tight seal, preventing fluid leakage from the connection between the intake section 113 and the transition section 112. In addition, compared with the embodiment in which the suction section 113 and the transition section 112 are welded for sealing, in this embodiment, the suction section 113 and the transition section 112 are detachably connected, thereby facilitating assembly and subsequent disassembly and maintenance.

[0075] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

1. A pump assembly, characterized in that: include: The housing comprises a liquid shell portion; the liquid shell portion comprises a liquid cavity extending in an axial direction; the liquid cavity comprises a liquid outlet and a communication hole arranged opposite to each other; a motor connected to the housing at a side of the housing away from the liquid outlet; the motor comprising a drive shaft extending along the axial direction; as well as A transmission shaft is provided in the liquid chamber and connected to the drive shaft at one end of the communication hole; the drive shaft is used to drive the transmission shaft to rotate; the transmission shaft is used to drive the liquid in the liquid chamber to leave through the liquid outlet by rotating; Wherein, the material of the liquid shell is a non-metallic material; the material of the transmission shaft accommodated in the liquid cavity is a non-metallic material.

2. The pump assembly according to claim 1, wherein The liquid shell portion includes a transition section and a suction section; the transition section is connected to a side of the suction section away from the liquid outlet; the suction section includes a liquid inlet; the liquid inlet is connected to the liquid cavity and is used to input fluid into the liquid cavity; The suction section and the transition section are made of different materials.

3. The pump assembly according to claim 2, characterized in that The material of the suction section is polyvinylidene fluoride; and / or the material of the transition section is polytetrafluoroethylene.

4. The pump assembly according to claim 2, wherein: The end surface of the suction section facing the transition section is provided with a receiving groove; the receiving groove is communicated with the liquid cavity; the end surface of the transition section facing the suction section is provided with a receiving protrusion; The accommodating protrusion cooperates with the accommodating groove to form an accommodating cavity whose opening is connected to the liquid cavity; the pump assembly further includes: The sealing structure includes a static sealing part; the static sealing part includes a third sealing ring; the third sealing ring is arranged in the accommodating cavity and has an interference fit with the accommodating groove; the size of the third sealing ring in the axial direction is smaller than the size of the accommodating cavity in the axial direction.

5. The pump assembly according to claim 1, wherein The liquid shell portion includes a suction section and a stator section; the stator section is connected to the side of the suction section facing the liquid outlet; the stator section includes a stator shell unit and a rubber stator disposed in the stator shell unit; the transmission shaft includes a screw section; the screw section is disposed at one end of the transmission shaft away from the motor; the rubber stator cooperates with the screw section to discharge the fluid in the liquid chamber through the liquid outlet when the transmission shaft rotates.

6. The pump assembly according to claim 5, characterized in that The liquid shell further includes a discharge section; the discharge section is arranged on a side of the stator section away from the suction section; the liquid outlet is arranged in the discharge section; The material of the discharge section is polyvinylidene fluoride, and / or; The material of the discharge section is the same as that of the suction section.

7. The pump assembly according to claim 5, wherein: The transmission shaft includes a transmission section connected to the motor and a connecting section connected between the transmission section and the screw section; the outer diameter of the connecting section is smaller than the outer diameters of the transmission section and the screw section; the outer diameter of the transmission section is larger than the outer diameter of the screw section.

8. The pump assembly according to claim 7, wherein The transmission shaft is integrally formed; the materials of the transmission shaft include polyetheretherketone, graphite, carbon fiber and polytetrafluoroethylene.

9. The pump assembly according to claim 1, wherein The pump assembly further comprises: The sealing structure includes a dynamic sealing part; the dynamic sealing part includes a static ring and a dynamic ring; the static ring and the dynamic ring are respectively sleeved on the transmission shaft; the static ring is connected to the inner wall of the shell; the dynamic ring abuts against the end face of the static ring facing the liquid outlet; the dynamic ring is connected to the transmission shaft and rotates with the transmission shaft; the material of the dynamic sealing part is non-metallic material.

10. The pump assembly according to claim 9, wherein The sealing structure also includes a limiting portion; the limiting portion is sleeved on the transmission shaft and is arranged at one end of the dynamic ring away from the static ring, for limiting the position of the dynamic sealing portion in the axial direction; the material of the limiting portion is non-metallic material.

11. The pump assembly of claim 1 , wherein: The shell includes a connecting shell portion; one side of the connecting shell portion is connected to the liquid shell portion, and the other side is connected to the motor; the connecting shell portion includes a connecting cavity; the end of the transmission shaft away from the liquid outlet extends to the connecting cavity and is connected to the drive shaft in the connecting cavity; the material of the connecting shell portion is metal.

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