Diaphragm pump

Abstract

The utility model provides a diaphragm pump, which belongs to the technical field of fluid transportation and comprises a pump body, an eccentric wheel assembly and a diaphragm, the driving part is fixed to the pump body, a driving shaft of the driving part penetrates through the pump body to stretch into the containing cavity, the driving shaft is rotationally connected with the pump body and is in transmission connection with the eccentric wheel assembly, a mounting groove is formed in the inner side wall of the pump body, a plurality of abutting parts are evenly distributed on the inner groove wall of the mounting groove at intervals, and a connecting bearing is arranged in the mounting groove; an inner ring of the connecting bearing is fixed with the driving shaft, and an outer ring of the connecting bearing is propped against the propping part; the pump has the advantages that the mounting groove is additionally formed in the inner cavity wall of the containing cavity, the connecting bearing is arranged in the mounting groove, on the basis that the driving shaft is rotationally connected with the pump body, additional supporting points are provided in the mode that the inner ring and the outer ring of the connecting bearing are connected with the driving shaft and the mounting groove respectively, and the two supporting points are distributed in the axis direction of the driving shaft; the stability of the driving shaft during operation is enhanced, the jumping phenomenon of the driving shaft is effectively reduced, and the stress distribution of the driving shaft is optimized.

Description

Technical Field

[0001] This utility model belongs to the field of fluid transport technology, and in particular relates to a diaphragm pump. Background Technology

[0002] Diaphragm pumps, as important fluid transport devices, are widely used in various industries such as chemical, pharmaceutical, food and beverage, and wastewater treatment. They change the volume of the pump chamber through the reciprocating motion of a flexible diaphragm, thereby achieving the intake and discharge of liquids. This design gives diaphragm pumps significant advantages when handling liquids containing solid particles, high-viscosity liquids, corrosive or sensitive media.

[0003] However, existing diaphragm pumps still face some technical challenges in practical applications: the drive shaft of a traditional diaphragm pump usually has only one support point, which can easily cause the drive shaft to bounce when rotating at high speed or under heavy load, thus affecting the smoothness and efficiency of power transmission; under high load conditions, diaphragm pumps are difficult to maintain long-term stable sealing performance, which can easily lead to leakage problems, affecting the reliability and safety of the equipment. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a diaphragm pump with a smoother drive shaft operation.

[0005] The objective of this utility model can be achieved through the following technical solution: a diaphragm pump, comprising:

[0006] The pump body has a receiving cavity, and an eccentric wheel assembly is disposed within the receiving cavity;

[0007] A driving component is fixed to the pump body, and the driving shaft of the driving component extends into the receiving cavity. The driving shaft passes through the pump body and extends into the receiving cavity. The driving shaft is rotatably connected to the pump body and is drively connected to the eccentric wheel assembly. An installation groove is provided on the inner side wall of the pump body. Multiple abutment portions are evenly distributed on the inner wall of the installation groove. A connecting bearing is provided in the installation groove. The inner ring of the connecting bearing is fixed to the driving shaft, and the outer ring of the connecting bearing abuts against the abutment portions.

[0008] In the aforementioned diaphragm pump, the mounting groove is a stepped groove, the outer ring of the connecting bearing abuts against the stepped surface of the mounting groove, while the inner ring of the connecting bearing does not contact the groove wall of the mounting groove.

[0009] In the aforementioned diaphragm pump, the abutment portion includes an abutment rib integrally disposed within the mounting groove, and the extending direction of each abutment rib is parallel to the axial direction of the drive shaft.

[0010] In the aforementioned diaphragm pump, a connecting ring is integrally formed on the inner wall of the pump body. The connecting ring is coaxial with the mounting groove, and the inner ring wall diameter of the connecting ring is equal to the inner groove wall diameter of the mounting groove. Reinforcing portions are provided at intervals on the outer ring wall of the connecting ring.

[0011] In the aforementioned diaphragm pump, a valve plate seat is provided on the pump body, a valve plate cover is provided on the valve plate seat, and a valve plate groove is provided on the valve plate seat. Sealing ribs of the same shape and corresponding positions are respectively provided on the valve plate seat and the valve plate groove. When the valve plate seat and the valve plate cover are fixed, a valve plate cavity is formed between the valve plate groove and the valve plate cover. A valve plate is provided in the valve plate cavity, and the sealing ribs on the valve plate seat and the sealing ribs on the valve plate groove abut against the two sides of the valve plate.

[0012] In the aforementioned diaphragm pump, the sealing ribs in the mounting groove include an inlet chamber and an outlet chamber surrounding the valve seat, and a first sealing convex ring and a second sealing convex ring with an annular structure.

[0013] In the aforementioned diaphragm pump, the portions of the first sealing ring and the second sealing ring located between the inlet chamber and the outlet chamber overlap each other.

[0014] In the aforementioned diaphragm pump, the valve cover has an inlet hole communicating with the inlet nozzle, and the valve cover also integrally has a first abutment boss, the first abutment boss having a first flow hole coaxially arranged with the inlet hole; the valve seat has an outlet hole communicating with the outlet nozzle, and the valve seat also integrally has a second abutment boss, the second abutment boss having a second flow hole coaxially arranged with the outlet hole; when the valve cover is connected to the valve seat, both the first abutment boss and the second abutment boss are interference-fitted with the valve plate.

[0015] In the aforementioned diaphragm pump, the wall of the first flow hole is connected to the outer surface of the first abutting boss via a first arc-shaped transition surface; the wall of the second flow hole is connected to the outer surface of the second abutting boss via a second arc-shaped transition surface.

[0016] In the aforementioned diaphragm pump, the first abutment boss exhibits a gradual change in diameter, decreasing as its straight-line distance from the inlet hole increases; the second abutment boss exhibits a gradual change in diameter, decreasing as its straight-line distance from the outlet hole increases.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] (1) An installation groove is added to the inner wall of the cavity, and a connecting bearing is configured in the installation groove. Based on the rotational connection between the drive shaft and the pump body, the inner and outer rings of the connecting bearing are connected to the drive shaft and the installation groove respectively to provide additional support points. The two support points are distributed along the axial direction of the drive shaft, which enhances the stability of the drive shaft during operation, effectively reduces the runout of the drive shaft, optimizes the force distribution of the drive shaft, ensures balanced load during power transmission, reduces the risk of deformation of the drive shaft due to uneven force, and improves the durability and reliability of the overall mechanism.

[0019] (2) Multiple evenly distributed abutment parts provide multi-point support, effectively dispersing the stress generated by the drive shaft when rotating at high speed or bearing a large load. Moreover, the presence of the abutment parts greatly simplifies the installation process, enabling the connecting bearing to avoid the difficult pressing problem caused by the interference fit between the entire outer ring and the mounting groove while ensuring accurate positioning. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 This is a schematic cross-sectional view of the connection between the pump body and the drive component;

[0022] Figure 3 This is a schematic diagram of the mounting groove inside the pump body;

[0023] Figure 4 This is a cross-sectional structural schematic diagram of the present invention;

[0024] Figure 5 yes Figure 4 A magnified schematic diagram of the local structure at point A;

[0025] Figure 6 This is a three-dimensional structural diagram of the valve plate seat;

[0026] Figure 7 yes Figure 6 A schematic diagram of the structure after the valve plate is installed;

[0027] Figure 8 This is a three-dimensional structural diagram of the valve cover.

[0028] In the figure, 100 is the pump body; 101 is the receiving cavity; 102 is the eccentric wheel assembly; 103 is the mounting groove; 104 is the abutment part; 105 is the connecting bearing; 106 is the connecting ring; 107 is the reinforcing part; 108 is the guide surface; 200 is the driving component; 201 is the driving shaft; 300 is the valve plate seat; 301 is the valve plate groove; 302 is the sealing rib; 303 is the valve plate; 304 is the liquid inlet chamber; 305 is the liquid outlet chamber; 306 is the first sealing convex ring; 307 is the second sealing convex ring; 308 is the liquid outlet hole; 309 is the second arc-shaped surface; 310 is the second abutment boss; 311 is the second flow hole; 400 is the valve plate cover; 401 is the liquid inlet nozzle; 402 is the liquid inlet hole; 403 is the liquid outlet nozzle; 404 is the first arc-shaped surface; 405 is the first abutment boss; 406 is the first flow hole. Detailed Implementation

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0030] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0031] like Figures 1-8 As shown, a diaphragm pump includes:

[0032] Pump body 100, a receiving cavity 101 is provided inside the pump body 100, and an eccentric wheel assembly 102 is provided inside the receiving cavity 101;

[0033] A drive component 200 is fixed to the pump body 100. The drive shaft 201 of the drive component 200 passes through the pump body 100 and extends into the receiving cavity 101. The drive shaft 201 is rotatably connected to the pump body 100 and is drively connected to the eccentric wheel assembly 102. An installation groove 103 is provided on the inner side wall of the pump body 100. A plurality of abutment portions 104 are evenly distributed on the inner wall of the installation groove 103. A connecting bearing 105 is provided in the installation groove 103. The inner ring of the connecting bearing 105 is fixed to the drive shaft 201, and the outer ring of the connecting bearing 105 abuts against the abutment portion 104.

[0034] In this embodiment, when the drive shaft 201 passes through the pump body 100 and extends into the receiving cavity 101, the drive shaft 201 is rotatably connected to the pump body 100, so that the pump body 100 can provide a rotational support point for the drive shaft 201. An installation groove 103 is added to the inner wall of the receiving cavity 101, and a connecting bearing 105 is arranged in the installation groove 103. On the basis of the rotatable connection between the drive shaft 201 and the pump body 100, the inner and outer rings of the connecting bearing 105 are connected to the drive shaft 201 and the installation groove 103 respectively, providing additional support points. The two support points are distributed along the axial direction of the drive shaft 201, which enhances the stability of the drive shaft 201 during operation, effectively reduces the vibration of the drive shaft 201, optimizes the force distribution of the drive shaft 201, ensures balanced load during power transmission, reduces the risk of deformation of the drive shaft 201 due to uneven force, and improves the durability and reliability of the overall mechanism.

[0035] Multiple evenly distributed abutment portions 104 provide multi-point support, effectively dispersing the stress generated by the drive shaft 201 when rotating at high speed or bearing a large load. Moreover, the presence of the abutment portions 104 greatly simplifies the installation process, enabling the connecting bearing 105 to avoid the difficult pressing problem caused by the interference fit between the entire outer ring and the mounting groove 103 while ensuring precise positioning.

[0036] More preferably, the mounting groove 103 is a stepped groove, with the outer ring of the connecting bearing 105 abutting against the stepped surface of the mounting groove 103, while the inner ring of the connecting bearing 105 does not contact the groove wall of the mounting groove 103.

[0037] In this embodiment, by designing the mounting groove 103 within the receiving cavity 101 as a stepped groove, the assembly process of the connecting bearing 105 is significantly simplified. Specifically, during the assembly of the connecting bearing 105, the assembler only needs to apply pressure to the connecting bearing 105 along the axial direction of the mounting groove 103 until the connecting bearing 105 can no longer move. At this point, it indicates that the outer ring of the connecting bearing 105 has accurately abutted against the stepped surface, completing the installation and positioning. This makes the assembly process faster and more accurate, and greatly improves assembly efficiency and accuracy, reducing errors or problems that may be caused by complex assembly steps. Furthermore, the lack of contact between the inner ring and the groove wall of the mounting groove 103 eliminates potential unnecessary friction, which not only reduces energy loss but also reduces the risk of wear, extending the service life of the connecting bearing 105 and the entire drive system.

[0038] Specifically, the abutment part 104 includes an abutment rib integrally disposed in the mounting groove 103. The extension direction of each abutment rib is parallel to the axial direction of the drive shaft 201. These abutment ribs can guide the connecting bearing 105 smoothly into the installation position, ensuring its precise alignment and positioning, and avoiding installation errors caused by offset or misalignment. The presence of the abutment ribs can also provide additional support points, effectively enhancing the stability of the outer ring of the connecting bearing 105, reducing radial runout during operation, and improving the rigidity and reliability of the overall structure.

[0039] More preferably, a connecting ring 106 is integrally provided on the inner wall of the pump body 100. The connecting ring 106 is coaxial with the mounting groove 103, and the inner ring wall diameter of the connecting ring 106 is equal to the inner groove wall diameter of the mounting groove 103. Reinforcing parts 107 are provided at intervals on the outer ring wall of the connecting ring 106.

[0040] In this embodiment, a connecting ring 106, coaxial with the mounting groove 103 and of the same diameter, is integrally provided on the inner wall of the pump body 100. This effectively extends the actual length of the mounting groove 103 along the axial direction, ensuring that the outer ring of the connecting bearing 105 has sufficient contact area, thereby enhancing the stability and support force of the connecting bearing 105 in the working state. The reinforcing part 107 on the outer ring wall of the connecting ring 106 not only helps to enhance the rigidity of the overall structure, but also disperses the load acting on the connecting bearing 105, which helps to maintain long-term stable operation.

[0041] It is worth mentioning that a guide surface 108 is provided between the inner ring wall of the connecting ring 106 and the end face of the connecting ring 106. The guide surface 108 is inclined relative to both. During assembly, the guide surface 108 can effectively guide the connecting bearing 105 to smoothly enter the installation position, reducing the difficulty of alignment and avoiding component damage caused by forced installation or improper operation. In addition, the side of the pump body 100 with the mounting groove 103 is detachably connected to the pump body body, which facilitates the installation and maintenance of internal components.

[0042] Preferably, the pump body 100 is provided with a valve plate seat 300, the valve plate seat 300 is provided with a valve plate cover 400, the valve plate seat 300 is provided with a valve plate groove 301, and the valve plate seat 300 and the valve plate groove 301 are respectively provided with sealing ribs 302 that correspond to each other in position and have the same shape. When the valve plate seat 300 and the valve plate cover 400 are fixed together, a valve plate cavity is formed between the valve plate groove 301 and the valve plate cover 400. A valve plate 303 is provided in the valve plate cavity, and the sealing ribs 302 on the valve plate cover 400 and the sealing ribs 302 on the valve plate groove 301 abut against the two sides of the valve plate 303 respectively.

[0043] In this embodiment, the valve plate 303 installed in the valve plate groove 301 can ensure a sealing effect under the clamping action of the valve plate seat 300 and the valve plate cover 400. In order to further improve the sealing effect of the valve plate 303, the sealing ribs 302 on the valve plate cover 400 and the valve plate groove 301 are respectively set to abut against the two sides of the valve plate 303, thereby squeezing the valve plate 303 and forming a double sealing structure, which effectively prevents fluid leakage and improves the sealing performance of the entire system.

[0044] Specifically, the sealing rib 302 in the mounting groove 103 includes an inlet chamber 304 and an outlet chamber 305 surrounding the valve plate seat 300, and a first sealing convex ring 306 and a second sealing convex ring 307 with an annular structure.

[0045] More preferably, the portions of the first sealing ring 306 and the second sealing ring 307 located between the liquid inlet chamber 304 and the liquid outlet chamber 305 overlap each other.

[0046] In this embodiment, the first sealing ring 306 and the second sealing ring 307 surround the liquid inlet chamber 304 and the liquid outlet chamber 305 respectively, forming two independent sealing areas, which effectively prevents liquid leakage from these critical parts; the first sealing ring 306 and the second sealing ring 307 located between the liquid inlet chamber 304 and the liquid outlet chamber 305 overlap, so that the two independent sealing rings share a section of sealing ring to form an “8”-shaped sealing rib 302, which reduces the need for additional sealing materials while ensuring the sealing effect, thereby reducing production costs.

[0047] Preferably, the valve cover 400 is provided with an inlet hole 402 communicating with the inlet nozzle 401. The valve cover 400 is also integrally provided with a first abutment boss 405, and a first flow hole 406 is provided in the first abutment boss 405 and is coaxially arranged with the inlet hole 402. The valve seat 300 is provided with an outlet hole 308 communicating with the outlet nozzle 403. The valve seat 300 is also integrally provided with a second abutment boss 310, and a second flow hole 311 is provided in the second abutment boss 310 and is coaxially arranged with the outlet hole 308. When the valve cover 400 and the valve seat 300 are connected, the first abutment boss 405 and the second abutment boss 310 are both interference-fitted with the valve 303.

[0048] In this embodiment, the presence of the first abutting boss 405 and the second abutting boss 310 ensures that there is an interference contact between the ends of the liquid inlet hole 402 and the liquid outlet hole 308 and the valve plate 303, which can achieve a tighter fit and effectively prevent liquid leakage, which is especially important in high pressure or high flow rate applications.

[0049] It should be noted that components such as the inlet nozzle 401, the outlet nozzle 403, and the inlet hole 402, as well as the flow path of the liquid in the diaphragm pump, are all technical features well known to those skilled in the art, and will not be described in detail in this application.

[0050] More preferably, the wall of the first flow hole 406 is connected to the outer surface of the first abutting boss 405 through a first arc-shaped surface 404; the wall of the second flow hole 311 is connected to the outer surface of the second abutting boss 310 through a second arc-shaped surface 309.

[0051] In this embodiment, the presence of the arc transition surface makes the contact between the valve plate 303 and the protruding end smoother, avoiding localized excessive wear or damage that may be caused by sharp edges. This is especially important for dynamic sealing, because repeated contact during long-term operation can easily lead to material fatigue and wear.

[0052] Further preferably, the first abutting boss 405 exhibits a gradual change in diameter as its straight-line distance from the liquid inlet 402 increases; the second abutting boss 310 exhibits a gradual change in diameter as its straight-line distance from the liquid outlet 308 increases.

[0053] In this embodiment, the first abutment boss 405 and the second abutment boss 310 are designed with a gradually decreasing diameter and a frustum-shaped protrusion, which is intended to reduce the contact area with the valve plate 303, thereby reducing frictional loss between the two, reducing wear and extending the service life of the valve plate 303; and although the contact area is reduced, the frustum-shaped protrusion can form a higher local pressure at the contact point, which helps to achieve a tighter sealing effect and prevent leakage.

[0054] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0055] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0056] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A diaphragm pump, characterized in that, include: The pump body has a receiving cavity, and an eccentric wheel assembly is disposed within the receiving cavity; A driving component is fixed to the pump body, and the driving shaft of the driving component extends into the receiving cavity. The driving shaft passes through the pump body and extends into the receiving cavity. The driving shaft is rotatably connected to the pump body and is drively connected to the eccentric wheel assembly. An installation groove is provided on the inner side wall of the pump body. Multiple abutment portions are evenly distributed on the inner wall of the installation groove. A connecting bearing is provided in the installation groove. The inner ring of the connecting bearing is fixed to the driving shaft, and the outer ring of the connecting bearing abuts against the abutment portions.

2. A diaphragm pump according to claim 1, characterized in that, The mounting groove is a stepped groove, with the outer ring of the connecting bearing abutting against the stepped surface of the mounting groove, while the inner ring of the connecting bearing does not contact the groove wall of the mounting groove.

3. A diaphragm pump according to claim 1, characterized in that, The abutting part includes an abutting rib integrally disposed in the mounting groove, and the extending direction of each abutting rib is parallel to the axial direction of the drive shaft.

4. A diaphragm pump according to claim 1, characterized in that, A connecting ring is integrally formed on the inner wall of the pump body. The connecting ring is coaxial with the mounting groove, and the inner ring wall diameter of the connecting ring is equal to the inner groove wall diameter of the mounting groove. Reinforcing parts are provided at intervals on the outer ring wall of the connecting ring.

5. A diaphragm pump according to claim 1, characterized in that, The pump body is provided with a valve plate seat, a valve plate cover, and a valve plate groove. The valve plate seat and the valve plate groove are respectively provided with sealing ribs that are one-to-one corresponding in position and have the same shape. When the valve plate seat and the valve plate cover are fixed, a valve plate cavity is formed between the valve plate groove and the valve plate cover. A valve plate is provided in the valve plate cavity, and the sealing ribs on the valve plate seat and the sealing ribs on the valve plate groove abut against the two sides of the valve plate.

6. A diaphragm pump according to claim 5, characterized in that, The sealing ribs in the mounting groove include an inlet chamber and an outlet chamber surrounding the valve seat, and a first sealing convex ring and a second sealing convex ring with an annular structure.

7. A diaphragm pump according to claim 6, characterized in that, The portions of the first sealing ring and the second sealing ring located between the liquid inlet chamber and the liquid outlet chamber overlap each other.

8. A diaphragm pump according to claim 5, characterized in that, The valve cover has an inlet hole communicating with the inlet nozzle. The valve cover also has an integrally formed first abutment boss, in which a first flow hole is provided and coaxially arranged with the inlet hole. The valve seat has an outlet hole communicating with the outlet nozzle. The valve seat also has an integrally formed second abutment boss, in which a second flow hole is provided and coaxially arranged with the outlet hole. When the valve cover is connected to the valve seat, the first abutment boss and the second abutment boss are both interference-fitted with the valve plate.

9. A diaphragm pump according to claim 8, characterized in that, The wall of the first flow hole is connected to the outer surface of the first abutting boss through a first arc-shaped surface; the wall of the second flow hole is connected to the outer surface of the second abutting boss through a second arc-shaped surface.

10. A diaphragm pump according to claim 8, characterized in that, The first abutment protrusion exhibits a gradual change in diameter, decreasing as its straight-line distance from the liquid inlet increases; the second abutment protrusion exhibits a gradual change in diameter, decreasing as its straight-line distance from the liquid outlet increases.

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