Diaphragm pump

Abstract

The diaphragm pump comprises a pump shell, a driving part and an extrusion structure, the driving part is fixedly connected with the pump shell, the extrusion structure comprises an eccentric block and a first bearing, the eccentric block is fixedly connected with an output shaft of the driving part, and the eccentric block is sleeved with the first bearing; a diaphragm is arranged in the pump shell, a cavity is formed between the outer circumferential wall of the diaphragm and the inner circumferential wall of the pump shell, and the inner circumferential wall of the diaphragm makes contact with the outer circumferential wall of the first bearing. The eccentric block is driven by the output shaft to rotate to drive the first bearing to do eccentric motion, so that the first bearing extrudes the diaphragm. The utility model provides a diaphragm pump which can avoid abrasion of a diaphragm, and is simple in structure and convenient to assemble and maintain.

Description

Technical Field

[0001] This utility model relates to the field of pump technology, and more specifically to a diaphragm pump. Background Technology

[0002] Peristaltic pumps can transport various low-viscosity liquids, corrosive liquids, and high-temperature liquids, making them ideal for demanding applications. They are widely used in chemical, food, pharmaceutical, and environmental protection industries. However, traditional peristaltic pumps pump fluid by alternately squeezing and releasing a flexible hose using rollers. The hose continuously expands and contracts under the action of the rollers, creating rhythmic deformation to force the liquid in and out. This structure requires constant hose compression, which can easily cause hose damage and shorten hose lifespan. Therefore, peristaltic pumps require frequent hose replacements.

[0003] To address the issue of hose damage in existing peristaltic pumps, Chinese patent CN208431139U discloses a diaphragm pump. While this prior art avoids diaphragm wear by fixing the diaphragm to the extrusion wheel, thus significantly extending its service life and eliminating the need for hose replacement like in peristaltic pumps, the diaphragm is fixed to the extrusion wheel. Furthermore, the diaphragm comprises an adhesive-coated diaphragm, a bushing, and a retaining ring. The adhesive-coated diaphragm is secured to the outer casing with fasteners, resulting in a complex structure and difficult assembly. If any component of the diaphragm is damaged, the entire diaphragm must be disassembled for repair or replacement, making maintenance inconvenient. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a diaphragm pump that can avoid diaphragm wear, and has a simple structure that is easy to assemble and maintain.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: a diaphragm pump, including a pump housing, a driving component, and a pressing structure. The driving component is fixedly connected to the pump housing. The pressing structure includes an eccentric block and a first bearing. The eccentric block is fixedly connected to the output shaft of the driving component. The first bearing is sleeved on the eccentric block. A diaphragm is provided inside the pump housing. A cavity is formed between the outer peripheral wall of the diaphragm and the inner peripheral wall of the pump housing. The inner peripheral wall of the diaphragm is in contact with the outer peripheral wall of the first bearing. The eccentric block rotates under the drive of the output shaft, causing the first bearing to make eccentric motion so that the first bearing presses the diaphragm.

[0006] In a preferred embodiment, the pump casing includes a cover plate, an outer casing, and an end plate, with the cover plate and end plate fixedly connected to both ends of the outer casing. The outer casing has a fluid inlet and a fluid outlet, and a cavity is formed between the inner peripheral wall of the outer casing and the outer peripheral wall of the diaphragm, with the cavity communicating with the fluid inlet and the fluid outlet respectively.

[0007] In a preferred embodiment, an annular bracket is provided on the inner side of the end plate, and the output shaft passes through the through hole in the middle of the annular bracket to be fixedly connected to the eccentric block. A second bearing is sleeved on the output shaft, and the outer wall of the second bearing is fixedly connected to the annular bracket.

[0008] In a preferred embodiment, the annular bracket has a recess on one side of the inner cavity of the housing, and the outer peripheral wall of the second bearing is fixedly connected to the inner peripheral wall of the recess.

[0009] In a preferred embodiment, the diaphragm is an elastic tube that is wide at both ends and narrow in the middle, and the two ends of the diaphragm are fixed to the inner wall of the outer shell by fixing rings.

[0010] In a preferred embodiment, annular rubber pads are fitted at both ends of the drive component, and mounting portions are provided on both sides of the bottom end of the annular rubber pads, with mounting holes on the mounting portions.

[0011] In a preferred embodiment, the drive component is fixedly connected to the end plate by a screw structure.

[0012] In a preferred embodiment, the driving component is a motor.

[0013] In a preferred embodiment, the retaining ring is made of aluminum alloy and the diaphragm is made of EPDM rubber.

[0014] In a preferred embodiment, the cover plate, outer shell, and end plate are all made of nylon.

[0015] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of this utility model are as follows: A diaphragm pump, by squeezing the diaphragm through a first bearing sleeved on an eccentric block, realizes the infeed and outfeed of fluid. Since there is only squeezing and no friction between the first bearing and the diaphragm, the diaphragm will not be worn, thus greatly extending the service life of the diaphragm and eliminating the need for frequent replacement like a peristaltic pump; at the same time, the diaphragm is fixedly installed inside the pump casing, without the need to be fixed on the first bearing, which is the squeezing component, resulting in a simple structure that is easy to assemble and maintain; in addition, the rocker arm that moves up and down inside the traditional peristaltic pump is eliminated, thereby reducing vibration and noise; furthermore, the one-way valve inside the traditional peristaltic pump is eliminated, allowing the use of fluid materials with larger particle sizes, thus expanding the scope of application.

[0016] In addition, other advantages of this invention will be set forth in the description which follows, in part will be obvious from the description, or may be learned by practice of this invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the diaphragm pump of this utility model;

[0019] Figure 2 This is an exploded structural diagram of the diaphragm pump of this utility model;

[0020] Figure 3 This is a side view of the diaphragm pump of this utility model;

[0021] Figure 4 for Figure 3 Cross-sectional view of position AA in the middle;

[0022] Figure 5 for Figure 3 Cross-sectional view of the middle BB position;

[0023] Explanation of reference numerals in the attached drawings: 1. Pump casing; 11. Cover plate; 12. Outer casing; 13. End plate; 130. Annular bracket; 14. Fluid inlet; 15. Fluid outlet; 2. Drive component; 21. Output shaft; 22. Annular rubber pad; 3. Eccentric block; 4. First bearing; 5. Second bearing; 6. Diaphragm; 7. Fixing ring; 8. Cavity; 9. Fluid channel. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] Reference Figures 1-5 This invention describes a diaphragm pump according to an embodiment of the present invention, which can be used in fields such as chemical, food, pharmaceutical, and environmental protection, for example, as a seasoning pump.

[0027] In one embodiment, such as Figures 1-5 As shown, a diaphragm pump includes a pump housing 1, a drive component 2, and a compression structure. The drive component 2 is fixedly connected to the pump housing 1. The compression structure includes an eccentric block 3 and a first bearing 4. The eccentric block 3 is fixedly connected to the output shaft 21 of the drive component 2. The first bearing 4 is sleeved on the eccentric block 3. A diaphragm 6 is provided inside the pump housing 1. A cavity 8 is formed between the outer peripheral wall of the diaphragm 6 and the inner peripheral wall of the pump housing 1. The inner peripheral wall of the diaphragm 6 is in contact with the outer peripheral wall of the first bearing 4. The eccentric block 3 rotates under the drive of the output shaft 21, causing the first bearing 4 to perform eccentric motion, so that the first bearing 4 compresses the diaphragm 6, thereby changing the volume of the cavity 8.

[0028] The working principle of the above-mentioned diaphragm pump is as follows: the pump casing 1 and the diaphragm 6 form a cavity 8. The eccentric block 3 rotates under the drive of the output shaft 21 and causes the first bearing 4 to generate eccentric motion. The eccentric motion of the first bearing 4 drives the diaphragm 6 to move, causing the volume of the cavity 8 to change, thereby realizing the pumping of fluid.

[0029] The diaphragm pump provided in the above embodiment compresses the diaphragm 6 by means of a first bearing 4 sleeved on the eccentric block 3, thereby achieving fluid injection and outflow. Since there is only compression and no friction between the first bearing 4 and the diaphragm 6, the diaphragm 6 will not be worn, thus greatly extending its service life and eliminating the need for frequent replacements like in a peristaltic pump. At the same time, the diaphragm 6 is fixedly installed inside the pump housing 1, without needing to be fixed to the first bearing 4, which serves as the compression component, resulting in a simple structure that is easy to assemble and maintain. Furthermore, the rocker arm that moves up and down inside a traditional peristaltic pump is eliminated, thereby reducing vibration and noise. Moreover, the one-way valve inside a traditional peristaltic pump is eliminated, allowing for the use of fluid materials with larger particle sizes, thus expanding its application range.

[0030] In this embodiment, the pump housing 1 includes a cover plate 11, an outer shell 12, and an end plate 13. The cover plate 11 and the end plate 13 are fixedly connected to both ends of the outer shell 12. The outer shell 12 is provided with a fluid inlet 14 and a fluid outlet 15. A cavity 8 is formed between the inner peripheral wall of the outer shell 12 and the outer peripheral wall of the diaphragm 6. The cavity 8 is connected to the fluid inlet 14 and the fluid outlet 15. Fluid channels 9 are provided between the fluid inlet 14 and the fluid outlet 15 and the cavity 8, respectively. The cavity 8 is connected to the fluid inlet 14 and the fluid outlet 15 through the two fluid channels 9, thereby realizing the liquid inlet and outlet of the diaphragm pump.

[0031] The diaphragm pump provided in the above embodiments integrates both the fluid inlet 14 and the fluid outlet 15 on the housing 12, resulting in a compact structure, small size, and convenient use.

[0032] In this embodiment, an annular bracket 130 is provided on the inner side of the end plate 13, and the output shaft 21 passes through the through hole in the middle of the annular bracket 130 to be fixedly connected with the eccentric block 3. A second bearing 5 is sleeved on the output shaft 21, and the outer wall of the second bearing 5 is fixedly connected with the annular bracket 130.

[0033] Among them, the annular bracket 130 and the end plate 13 are integrally formed structures, and the second bearing 5 is sleeved on the output shaft 21 and located at the rear end of the eccentric block 3.

[0034] In practice, a second bearing 5 is provided between the output shaft 21 and the annular bracket 130 to prevent the output shaft 21 from shaking, ensure the firmness of the drive component 2 installation, and thus improve the stability of the diaphragm pump.

[0035] Furthermore, the annular bracket 130 has a recessed platform on one side of the inner cavity of the outer shell 12, and the outer peripheral wall of the second bearing 5 is fixedly connected to the inner peripheral wall of the recessed platform.

[0036] In this embodiment, the second bearing 5 is fixedly connected by the concave platform structure of the annular bracket 130, which is simple in structure and easy to assemble.

[0037] In this embodiment, the diaphragm 6 is an elastic tube that is wide at both ends and narrow in the middle, and the two ends of the diaphragm 6 are respectively fixed to the inner wall of the outer shell 12 by fixing rings 7.

[0038] In the above embodiment, the diaphragm 6 includes annular edges that are wider at both ends and a concave portion that is narrower in the middle. The top surface of the concave portion is flat and contacts the outer peripheral wall of the first bearing 4. It will deform when squeezed by the first bearing 4. The two ends are annular edges that make it easy for the fixing ring 7 to press and fix the two ends of the diaphragm 6 to the inner walls of the two ends of the outer shell 12, so that a sealed cavity 8 is formed between the outer peripheral wall of the diaphragm 6 and the inner peripheral wall of the outer shell 12. The cavity 8 is connected to the fluid inlet 14 and the fluid outlet 15 respectively to realize the fluid pumping function.

[0039] In this embodiment, annular rubber pads 22 are respectively fitted on both ends of the driving component 2. The bottom ends of the annular rubber pads 22 are provided with mounting portions on both sides, and mounting holes are provided on the mounting portions to facilitate the installation of the driving component 2 into the required position.

[0040] In this embodiment, the drive component 2 is fixedly connected to the end plate 13 by a screw structure, ensuring a secure connection and guaranteeing the stability of the diaphragm pump operation. Furthermore, the drive component 2 is a motor. In practical applications, users can also select other drive devices as needed, such as cylinders or hydraulic drive devices.

[0041] In this embodiment, the fixing ring 7 is made of aluminum alloy, and the diaphragm 6 is made of EPDM rubber.

[0042] Among them, aluminum alloy is lightweight, corrosion-resistant, and chemically stable; EPDM rubber is a terpolymer of ethylene, propylene, and non-conjugated dienes, which has excellent resistance to oxidation, ozone, and corrosion, and can further extend its service life.

[0043] In this embodiment, the cover plate 11, the outer shell 12, and the end plate 13 are all made of nylon.

[0044] Nylon materials are characterized by hydrophilicity, lubricity, wear resistance, corrosion resistance, and ease of processing and molding. They also have good oil resistance, strong barrier properties, and are non-toxic and odorless.

[0045] Other configurations and operations of the diaphragm pump according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0046] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] In the description of this specification, references to the terms "embodiment," "specific embodiment," "example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example that is included in at least one embodiment or example of the present invention.

[0048] In this specification, the illustrative expressions of the terms used do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined with each other in any suitable manner in one or more embodiments or examples without interference or contradiction.

Claims

1. A diaphragm pump, comprising a pump housing, a drive component, and a compression structure, wherein the drive component is fixedly connected to the pump housing, characterized in that: The extrusion structure includes an eccentric block and a first bearing. The eccentric block is fixedly connected to the output shaft of the drive component, and the first bearing is sleeved on the eccentric block. The pump casing is provided with a diaphragm, and a cavity is formed between the outer peripheral wall of the diaphragm and the inner peripheral wall of the pump casing. The inner peripheral wall of the diaphragm is in contact with the outer peripheral wall of the first bearing. The eccentric block rotates under the drive of the output shaft, causing the first bearing to make an eccentric motion, so that the first bearing squeezes the diaphragm.

2. A diaphragm pump according to claim 1, characterized in that: The pump casing includes a cover plate, an outer casing, and an end plate, wherein the cover plate and the end plate are respectively fixedly connected to both ends of the outer casing; The outer shell is provided with a fluid inlet and a fluid outlet. The cavity is formed between the inner peripheral wall of the outer shell and the outer peripheral wall of the diaphragm. The cavity is connected to the fluid inlet and the fluid outlet, respectively.

3. A diaphragm pump according to claim 2, characterized in that: The inner side of the end plate is provided with an annular bracket, and the output shaft passes through the through hole in the middle of the annular bracket to be fixedly connected to the eccentric block. A second bearing is sleeved on the output shaft, and the outer wall of the second bearing is fixedly connected to the annular bracket.

4. A diaphragm pump according to claim 3, characterized in that: The annular bracket has a recessed platform on one side of the inner cavity of the outer shell, and the outer peripheral wall of the second bearing is fixedly connected to the inner peripheral wall of the recessed platform.

5. A diaphragm pump according to any one of claims 2 to 4, characterized in that: The diaphragm is an elastic tube that is wide at both ends and narrow in the middle, and the two ends of the diaphragm are respectively fixed to the inner wall of the outer shell by fixing rings.

6. A diaphragm pump according to claim 5, characterized in that: The driving component has annular rubber pads fitted at both ends, and mounting portions are provided on both sides of the bottom end of the annular rubber pads, with mounting holes on the mounting portions.

7. A diaphragm pump according to claim 6, characterized in that: The drive component is fixedly connected to the end plate by a screw structure.

8. A diaphragm pump according to claim 1, characterized in that: The driving component is a motor.

9. A diaphragm pump according to claim 5, characterized in that: The fixing ring is made of aluminum alloy, and the diaphragm is made of EPDM rubber.

10. A diaphragm pump according to claim 9, characterized in that: The cover plate, the outer shell, and the end plate are all made of nylon.

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