Diaphragm pump

Abstract

The utility model discloses a diaphragm pump which comprises a pump chamber module, a diaphragm assembly and an eccentric power assembly, and the diaphragm assembly comprises deformation structures corresponding to liquid transfer cavities and sealing structures arranged on the peripheries of the deformation structures. The sealing structure comprises a sealing part connected with the deformation structure and a clamping part located on the outer side of the sealing part and connected with the sealing part, and an annular sealing groove is formed in the end face of the pump rear cavity and / or the pump chamber; the sealing part is clamped by the pump rear cavity and the pump chamber, the annular protrusion is embedded into the annular sealing groove to form sealing, and at least part of the clamping part is clamped and pressed between the pump rear cavity and the pump chamber. When the deformation structure deforms and pulls the sealing part, the clamping part located on the periphery of the sealing part is clamped by the pump rear cavity and the pump chamber, and force opposite to the deformation structure is applied to the sealing part, so that the sealing part is kept in situ as much as possible, the stretching resistance of the sealing part is improved, and the annular protrusion of the sealing part is not prone to loosening and disengaging from the annular sealing groove; and the sealing performance of the liquid transfer cavity and the diaphragm assembly is ensured.

Description

Technical Field

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

[0002] The existing utility model patent CN202326123U discloses a diaphragm pump, including a pump front chamber and a pump rear chamber that cooperate to form a cavity, a motor, an eccentric shaft, an inclined wheel, and a diaphragm array. When the inclined surface of the inclined wheel corresponding to the diaphragm at point A moves from its forward position to its rearward position, the axial distance between the diaphragm and the inlet check valve increases, and the cavity between the two generates suction. As a result, liquid flows from the fixed column side of the inlet check valve to the valve plate side, performing the main liquid suction action. A small amount of suction or repulsion is generated between the adjacent diaphragm and the inlet check valve or the outlet check valve, and a large amount of repulsion is generated between the opposite diaphragm and the outlet check valve, performing the main liquid discharge action. Thus, for each revolution of the motor, the four diaphragms also take turns performing one liquid suction and one liquid discharge operation.

[0003] As can be seen from the above, the outer edge of the diaphragm 6 in the aforementioned patent is sealed by a spherical annular protrusion that is fitted into a matching annular groove and held in place by the pump rear cavity 2 and the cavity mounting plate 10. Therefore, the sealing of the diaphragm is particularly important for the diaphragm pump. If the outer edge of the diaphragm leaks, the diaphragm will not be able to generate suction or repulsion with the inlet check valve or the outlet check valve, causing the diaphragm pump to fail.

[0004] However, especially when the diaphragm pump mentioned above is used for pumping medium and large flow rates of liquid, the flow rate of the liquid to be sucked in and discharged is large, and the axial movement of the diaphragm is also larger. The spherical annular protrusion undergoes large deformation in the matching annular groove. The annular protrusion is more prone to fatigue failure, and may even cause the annular sealing protrusion to fall out of the matching annular groove, resulting in sealing failure, leakage of the diaphragm pump, and inability to work normally. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a diaphragm pump that solves the problem that the outer edge of the diaphragm is prone to sealing failure when the existing diaphragm pump is in use.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A diaphragm pump includes a pump chamber module, a diaphragm assembly, and an eccentric power assembly;

[0008] The pump chamber module includes a front pump chamber, a pump chamber, and a rear pump chamber. The front pump chamber includes an inlet and an outlet. The pump chamber is assembled between the front pump chamber and the rear pump chamber and is sealed with the front pump chamber to form an inlet chamber communicating with the inlet and an outlet chamber communicating with the outlet.

[0009] The pump chamber module has multiple liquid transfer chambers. An inlet check valve is provided between the liquid inlet chamber and the liquid transfer chamber, and an outlet check valve is provided between the liquid transfer chamber and the liquid outlet chamber.

[0010] The diaphragm assembly is sealed to each of the liquid transfer chambers, and the eccentric power assembly is driven to the diaphragm assembly to alternately change the distance between the diaphragm assembly and the liquid inlet check valve in each of the liquid transfer chambers, so that each of the liquid transfer chambers alternately connects to the liquid inlet chamber to achieve liquid suction or alternately connects to the liquid outlet chamber to achieve liquid discharge.

[0011] The diaphragm assembly includes a deformation structure corresponding to each of the liquid transfer chambers, and a sealing structure disposed on the outer periphery of the deformation structure. The sealing structure includes a sealing part connected to the deformation structure and a clamping part located outside the sealing part and connected to the sealing part. The end face of the pump rear cavity and / or the pump chamber is provided with an annular sealing groove.

[0012] The sealing part includes an annular protrusion, the sealing part is clamped by the pump rear cavity and the pump chamber and the annular protrusion is embedded in the annular sealing groove to form a seal, and at least a portion of the clamping part is clamped and pressed between the pump rear cavity and the pump chamber.

[0013] The diaphragm pump provided by this utility model achieves a seal between the diaphragm assembly and the pump chamber module through a sealing structure on the outer periphery of the deformation structure to close the liquid transfer chamber. Thus, the deformation structure deforms under the action of the eccentric power component to change the volume of the liquid transfer chamber, allowing the chamber to draw in or discharge liquid. The sealing structure includes a sealing part and a clamping part located outside the sealing part. After the sealing part is clamped, the annular protrusion is embedded in the annular sealing groove to achieve a seal. Simultaneously, at least a portion of the clamping part is clamped and pressed between the pump rear chamber and the pump chamber. Therefore, even when pumping a large flow rate of liquid, when the deformation structure undergoes significant axial deformation and pulls on the sealing part, the clamping part located on the outer periphery of the sealing part is clamped by the pump rear chamber and the pump chamber, applying a force opposite to the force exerted by the deformation structure on the sealing part. This keeps the sealing part in its original position as much as possible, improving its tensile strength. The annular protrusion of the sealing part is less likely to loosen and detach from the annular sealing groove, ensuring the sealing performance of the liquid transfer chamber and the diaphragm assembly.

[0014] Preferably, the diaphragm assembly is a one-piece structure, including a connecting portion located in the middle region, the connecting portion connecting each of the sealing structures, and the deformation structures being distributed around the center of the diaphragm assembly.

[0015] With this configuration, the diaphragm assembly is a one-piece structure, meaning that all the deformation structures and their outer sealing structures are connected through the connecting part in the middle area. As a whole, the diaphragm assembly has better overall strength. The deformation structures are distributed around each other, ensuring that any deformation structure can receive support in the opposite direction of the tensile force when subjected to tensile force in any direction. When a deformation structure deforms and pulls the corresponding sealing structure, it will also involve the connecting part and other deformation structures and other sealing structures, making the pulled sealing structure less likely to move. The annular protrusion is pulled in the opposite direction of the pull and is not easy to loosen and detach from the annular sealing groove, thus ensuring the sealing performance of the diaphragm assembly.

[0016] Preferably, the connecting part is sealed and clamped by the end face of the pump rear cavity and the pump chamber, which increases the sealing surface between the diaphragm assembly and the pump chamber and the pump rear cavity, improves the sealing effect, and makes the connecting part less likely to move under the force, thereby ensuring that the sealing structure connected to the connecting part is less likely to be pulled, and improving the tensile strength and sealing performance of the sealing structure.

[0017] Preferably, adjacent deformable structures share a common clamping portion, and the common portion of the clamping portion is fixedly connected to the connecting portion; this makes the distance between adjacent deformable structures smaller, the entire diaphragm assembly structure more compact, and at the same time, it can also ensure the tensile strength and sealing performance between each deformable structure and its corresponding sealing structure.

[0018] Preferably, the diaphragm assembly includes a limiting portion located at the outer edge, the limiting portion being disposed radially outside the clamping portion and protruding from the end face of the clamping portion; a limiting groove is provided between the pump rear cavity and the pump chamber, and the limiting portion is placed in the limiting groove.

[0019] Based on the one-piece structure of the diaphragm assembly, the annular protrusions in each sealing structure need to be inserted into their respective annular sealing grooves. However, during installation, it is impossible to ensure that all annular protrusions are simultaneously embedded in the annular sealing grooves, resulting in installation deviations and difficulty in positioning. Ultimately, this leads to misalignment between the annular protrusions and the annular sealing grooves, resulting in poor sealing and leakage. Therefore, a limiting part is set on the outer edge of the diaphragm assembly, which is pre-positioned with the limiting groove between the pump rear cavity and the pump chamber. After determining the position of each annular protrusion and the annular sealing groove, the annular protrusions are uniformly embedded into their corresponding annular sealing grooves, achieving a flat installation of the diaphragm assembly. This avoids the grinding and contamination of the annular protrusions and annular sealing grooves caused by repeated adjustments to the position of the diaphragm assembly, and also avoids the twisting of the diaphragm assembly due to installation deviations.

[0020] Preferably, the limiting part is an annular shape that matches the outer edge shape of the diaphragm assembly; it provides comprehensive positioning of the diaphragm assembly, allowing each annular protrusion to quickly align and embed with the annular sealing groove, ensuring a flat installation of the diaphragm assembly; at the same time, the annular limiting part also improves the integrity of the diaphragm assembly and enhances its tensile strength.

[0021] Preferably, the clamping portion includes an annular region adapted to the outer peripheral contour of the sealing portion and a connecting region fixedly connected to the adjacent annular region, the connecting region being fixedly connected to the connecting portion.

[0022] With this configuration, the annular area serves to ensure that at least part of the clamping part corresponds to the contour of the sealing part. Regardless of whether the sealing part is pulled by a force in any direction, the clamping part in the opposite direction can provide a reaction force, making it difficult for the annular protrusion to detach from the annular sealing groove. The connecting area is designed to further strengthen the structural strength and connection strength between adjacent annular areas and improve the tensile strength of the clamping part.

[0023] Preferably, the lower end face of the clamping part and the upper end face of the pump chamber are both planes and they seal against each other, which can enhance the friction and sealing performance between the clamping part and the pump chamber, and at the same time enable the clamping part to provide a greater reaction force when the sealing part is pulled, so as to prevent the sealing part from moving.

[0024] Preferably, the sealing part includes a flat section fixed to the annular protrusion, the annular protrusion protruding from the lower end face of the flat section, the flat section being fixedly connected to the clamping part, the pump rear cavity pressing the flat section, and the annular protrusion being interference-fitted with the annular sealing groove.

[0025] With this configuration, the flat section and the rear chamber of the pump achieve a planar compression seal. At the same time, the extrusion force applied by the rear chamber of the pump to the flat section can press the annular protrusion into the annular sealing groove. Since the flat section and the rear chamber of the pump are planar compression seals, the movement space of the sealing part between the rear chamber of the pump and the pump chamber is smaller. After the annular protrusion and the annular sealing groove are interference-fitted, it is less likely to fall out, thus ensuring the sealing performance of the sealing part.

[0026] Preferably, the upper end face of the clamping part is a flat surface, and the upper end face of the flat section is horizontally flush with the upper end face of the clamping part, so that the pump cavity simultaneously squeezes the clamping part and the upper end face of the flat section, restricting the movement space of the sealing structure and ensuring the sealing effect.

[0027] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0028] This utility model discloses a diaphragm pump in which the diaphragm assembly achieves a seal with the pump chamber module through a sealing structure on the outer periphery of the deformation structure to close the liquid transfer chamber. Thus, the deformation structure deforms under the action of the eccentric power component to change the volume of the liquid transfer chamber, allowing the chamber to draw in or discharge liquid. The sealing structure includes a sealing part and a clamping part located outside the sealing part. After the sealing part is clamped, the annular protrusion is embedded in the annular sealing groove to achieve a seal. Simultaneously, at least a portion of the clamping part is clamped and pressed between the pump rear cavity and the pump chamber. Therefore, even when pumping a large flow rate of liquid, when the deformation structure undergoes significant axial deformation and pulls on the sealing part, the clamping part located on the outer periphery of the sealing part is clamped by the pump rear cavity and the pump chamber, applying a force opposite to the force exerted by the deformation structure on the sealing part. This keeps the sealing part in its original position as much as possible, improving its tensile strength. The annular protrusion of the sealing part is less likely to loosen and detach from the annular sealing groove, ensuring the sealing performance of the liquid transfer chamber and the diaphragm assembly. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a cross-sectional schematic diagram of the diaphragm pump according to Embodiment 1 of this utility model.

[0031] Figure 2 for Figure 1 Enlarged view of point A in the image.

[0032] Figure 3 This is a schematic diagram of the diaphragm assembly according to Embodiment 1 of this utility model.

[0033] Figure 4 for Figure 3 A schematic diagram of the diaphragm assembly from another angle.

[0034] Figure 5 This is a schematic diagram of the diaphragm assembly according to Embodiment 2 of this utility model.

[0035] Figure 6 This is a cross-sectional schematic diagram of the diaphragm pump according to Embodiment 3 of this utility model.

[0036] Figure 7 This is a schematic diagram of the diaphragm assembly according to Embodiment 3 of this utility model.

[0037] Explanation of reference numerals in the attached figures

[0038] 10. Pump chamber module; 11. Pump front chamber; 111. Liquid inlet; 112. Liquid outlet; 12. Pump chamber; 121. Annular sealing groove; 13. Pump rear chamber; 14. Liquid inlet chamber; 15. Liquid outlet chamber; 16. Liquid transfer chamber; 17. Liquid inlet check valve; 18. Liquid outlet check valve; 19. Limiting groove;

[0039] 20. Diaphragm assembly; 21. Deformation structure; 22. Sealing part; 221. Annular protrusion; 222. Flat section; 23. Clamping part; 231. Annular area; 232. Connecting area; 24. Connecting part; 25. Limiting part;

[0040] 30. Eccentric power assembly. Detailed Implementation

[0041] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0042] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "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 of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] 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.

[0044] like Figures 1 to 7As shown, the diaphragm pump of this utility model embodiment includes a pump chamber module 10, a diaphragm assembly 20, and an eccentric power assembly 30. The pump chamber module 10 provides a chamber and flow channel for liquid flow, specifically including a pre-pump chamber 11, a pump chamber 12, and a post-pump chamber 13. The pump chamber 12 is assembled in the pre-pump chamber 11, and the post-pump chamber 13 is fixed in the opening of the pre-pump chamber 11. The pump chamber 12 is clamped and fixed in the pre-pump chamber 11, and the three are fixedly connected.

[0045] The pump pre-cavity 11 includes an inlet 111 and an outlet 112. The pump chamber 12 is assembled between the pump pre-cavity 11 and the pump post-cavity 13 and is sealed to the pump pre-cavity 11 to form an inlet chamber 14 communicating with the inlet 111 and an outlet chamber 15 communicating with the outlet 112. The pump chamber module 10 has multiple transfer chambers 16. An inlet check valve 17 is provided between the inlet chamber 14 and the transfer chamber 16, and an outlet check valve 18 is provided between the transfer chamber 16 and the outlet chamber 15. Liquid chamber 14 and liquid transfer chamber 16 are connected in one direction through liquid inlet check valve 17, allowing liquid to flow into liquid inlet chamber 14 from liquid inlet 111, but not in the reverse direction. Liquid transfer chamber 16 and liquid outlet chamber 15 are connected in one direction through liquid outlet check valve 18, allowing liquid to flow from liquid transfer chamber 16 to liquid outlet chamber 15, and then out from liquid outlet 112, but not in the reverse direction. Liquid inlet check valve 17 and liquid outlet check valve 18 are both existing opening and closing methods, and will not be described in detail here.

[0046] To enable liquid flow between the inlet chamber 14 and the transfer chamber 16, and between the transfer chamber 16 and the outlet chamber 15, the diaphragm assembly 20 is sealed to each transfer chamber 16. The eccentric power assembly 30 is drivenly connected to the diaphragm assembly 20, thereby alternately changing the distance between the diaphragm assembly 20 and the inlet check valve 17 in each transfer chamber 16. This allows each transfer chamber 16 to alternately connect to the inlet chamber 14 for liquid intake or alternately connect to the outlet chamber 15 for liquid discharge. The structure of the eccentric power assembly 30 itself and its cooperation with the diaphragm assembly 20 are the same as those of conventional diaphragm pumps in the prior art, and will not be described in detail here.

[0047] The diaphragm assembly 20 includes a deformable structure 21 corresponding to each liquid transfer chamber 16 and a sealing structure disposed on the outer periphery of the deformable structure 21. The deformable structure 21 is fixedly connected to the eccentric power assembly 30. During the operation of the diaphragm pump, under the action of the eccentric power assembly 30, each deformable structure 21 is axially pushed and pulled and deformed, thereby changing the volume of the liquid transfer chamber 16 and generating suction or thrust on the liquid. Therefore, the sealing effect between the sealing structure and the pump rear chamber 13 and the pump chamber 12 is particularly important.

[0048] To prevent the sealing structure from failing due to the stretching of the deformation structure 21, the sealing structure of this utility model embodiment includes a sealing part 22 connected to the deformation structure 21 and a clamping part 23 located outside the sealing part 22 and connected to the sealing part 22. Correspondingly, the end face of the pump rear cavity 13 and / or pump chamber 12 is provided with an annular sealing groove 121. The sealing part 22 includes an annular protrusion 221. The sealing part 22 is clamped by the pump rear cavity 13 and the pump chamber 12, and the annular protrusion 221 is embedded in the annular sealing groove 121 to form a seal. At least part of the clamping part 23 is clamped and pressed between the pump rear cavity 13 and the pump chamber 12. Even when pumping a large flow of liquid, the deformation structure 21 deforms axially and pulls the sealing part 22. The clamping part 23 located on the outer periphery of the sealing part 22 is clamped by the pump rear cavity 13 and the pump chamber 12, applying a force opposite to the pulling force of the deformation structure 21 to the sealing part 22, so that the sealing part 22 is kept in its original position as much as possible, improving the tensile strength of the sealing part 22. The annular protrusion 221 of the sealing part 22 is less likely to loosen and detach from the annular sealing groove 121, ensuring the sealing performance of the liquid transfer chamber 16 and the diaphragm assembly 20.

[0049] like Figures 1 to 4 In the illustrated embodiment 1, the diaphragm assembly 20 is a one-piece structure, including a connecting portion 24 located in the middle region. The connecting portion 24 connects each sealing structure, that is, each deformable structure 21 and its surrounding sealing structure are connected through the connecting portion 24 in the middle region. Therefore, the diaphragm assembly 20 as a whole has better strength and stronger tensile performance. When a deformable structure 21 deforms and pulls the corresponding sealing structure, it will also involve the connecting portion 24 and other deformable structures 21 and other sealing structures, making the pulled sealing structure less likely to move. The annular protrusion 221 is pulled in the opposite direction of the pull and is not easy to loosen and detach from the annular sealing groove 121, thus ensuring the sealing performance of the diaphragm assembly 20.

[0050] In the diaphragm assembly 20, the number of deformation structures 21 corresponds one-to-one with the number of sealing structures, so as to... Figure 4 For example, the diaphragm assembly 20 includes four deformable structures 21, each with a circular outer contour, and the corresponding sealing part 22 also has a circular outer contour.

[0051] Since each deformation structure 21 needs to be connected to the eccentric power component 30, in order to ensure that the deformation amount of each deformation structure 21 is basically the same when it deforms in sequence, each deformation structure 21 needs to be distributed at intervals with the rotation center of the eccentric power component 30 as the center. When the diaphragm component 20 is a one-piece structure, the center of the diaphragm component 20 is basically coincident with the rotation center of the eccentric power component 30. Therefore, each deformation structure 21 is distributed around the center of the diaphragm component 20. This distribution also ensures that any deformation structure 21 can receive the support force in the opposite direction of the tensile force when subjected to tensile force in any direction.

[0052] like Figure 1 As shown, the connecting part 24 is located between the end faces of the pump rear cavity 13 and the pump chamber 12. Preferably, the connecting part 24 is sealed and clamped by the end faces of the pump rear cavity 13 and the pump chamber 12, which increases the sealing surface between the diaphragm assembly 20 and the pump chamber 12 and the pump rear cavity 13, improves the sealing effect, and makes the connecting part 24 less likely to move, thereby ensuring that the sealing structure connected to the connecting part 24 is not easily pulled, and improving the tensile strength and sealing performance of the sealing structure.

[0053] When the distance between two deformable structures 21 is close, the adjacent deformable structures 21 share a portion of the clamping part 23. For example, a portion of the clamping part 23 is located between two adjacent deformable structures 21. This portion of the clamping part 23 is connected to both adjacent deformable structures 21 and is clamped by the pump chamber 12 and the post-pump cavity 13. This allows the adjacent deformable structures 21 to share a portion of the clamping part 23, making the entire diaphragm assembly 20 structure more compact. The shared portion of the clamping part 23 is fixedly connected to the connecting part 24, which also ensures the tensile strength and sealing performance between each deformable structure 21 and the corresponding sealing structure.

[0054] Depending on the shape and location of the clamping portion 23, the clamping portions 23 shared between adjacent deformable structures 21 may differ. For example, in some embodiments, the clamping portion 23 includes several block-shaped structures circumferentially spaced around the outer periphery of the sealing portion 22 and fixedly connected to the sealing portion 22, which can also apply a force opposite to the direction of the tensile force to the sealing portion 22. If a block-shaped clamping portion 23 is located between two adjacent deformable structures 21, and the block-shaped structure is simultaneously connected to both adjacent deformable structures 21, then the adjacent deformable structures 21 are considered to share the block-shaped clamping portion 23.

[0055] In such Figure 4 In the first embodiment shown, the clamping part 23 includes an annular region 231 that matches the outer periphery of the sealing part 22 and a connecting region 232 that is fixedly connected to adjacent annular regions 231. Figure 4The dotted ring portion in the diagram represents the annular area 231. There are four annular areas 231. The connecting area 232 is located near the outer edge of the diaphragm assembly 20, connecting two adjacent annular areas 231. The connecting part 24 is located at the center of the diaphragm assembly 20 and connects to the annular areas 231 of each clamping part 23. The function of the annular area 231 is to ensure that at least part of the clamping part 23 corresponds to the contour of the sealing part 22. No matter which direction the sealing part 22 is pulled, the clamping part 23 in the opposite direction can provide a reaction force, making it difficult for the annular protrusion 221 to detach from the annular sealing groove 121. The connecting area 232 is used to further strengthen the structural strength and connection strength between adjacent annular areas 231 and improve the tensile strength of the clamping part 23. In this embodiment, the connecting area 232 and the connecting part 24 are fixedly connected indirectly through the annular area 231. Figure 4 In the middle, the two dashed lines between two adjacent deformable structures 21 intersect, indicating the area of ​​the shared clamping part 23 between the adjacent deformable structures 21, that is, the area where the two annular regions 231 overlap.

[0056] Of course, in other embodiments, depending on the different shapes of the clamping part 23, the connection area 232 and the connection part 24 can be directly connected. In this case, two adjacent annular areas 231 are spaced apart, and the connection area 232 extends through the space and is directly fixed to the connection part 24 (not shown in the figure). The above-mentioned fixing can be integral molding fixing or welding fixing, etc.

[0057] like Figure 2 In the first embodiment shown, the lower end face of the clamping part 23 and the upper end face of the pump chamber 12 are both flat and sealed against each other. This can enhance the friction and sealing performance between the clamping part 23 and the pump chamber 12, and at the same time, the clamping part 23 can provide a greater reaction force when the sealing part 22 is pulled, preventing the sealing part 22 from moving. In addition, the upper end face of the clamping part 23 and the lower end face of the pump rear cavity 13 are also flat and sealed against each other. Through the sealing and squeezing force of the pump chamber 12 and the pump rear cavity 13 on the clamping part 23, the clamping part 23 can provide a greater reaction force for the sealing part 22, improving the tensile strength of the sealing part 22.

[0058] In this embodiment, only the end face of the pump chamber 12 is provided with an annular sealing groove 121. The annular protrusion 221 is embedded in the annular sealing groove 121 of the pump chamber 12. The other end face of the sealing part 22 is squeezed by the rear cavity 13 of the pump. Specifically, the sealing part 22 includes a flat section 222 fixed to the annular protrusion 221. The annular protrusion 221 protrudes from the lower end face of the flat section 222. The flat section 222 is fixedly connected to the clamping part 23. The rear cavity 13 of the pump squeezes the flat section 222, and the annular protrusion 221 and the annular sealing part 221 are sealed together. The sealing groove 121 is interference-fitted; the flat section 222 and the pump rear cavity 13 achieve planar extrusion, and at the same time, the extrusion force applied by the pump rear cavity 13 to the flat section 222 can press the annular protrusion 221 into the annular sealing groove 121. Since the flat section 222 and the pump rear cavity 13 are planar extrusions, the movement space of the sealing part 22 between the pump rear cavity 13 and the pump chamber 12 is smaller, and the annular protrusion 221 is less likely to fall out after the interference fit with the annular sealing groove 121, thus ensuring the sealing performance of the sealing part 22.

[0059] In some embodiments, both the end faces of the pump rear cavity 13 and the pump chamber 12 are provided with annular sealing grooves 121, and the annular protrusions 221 are simultaneously embedded in the annular sealing grooves 121 on the end faces of both the pump rear cavity 13 and the pump chamber 12. In other embodiments, only the end face of the pump rear cavity 13 is provided with annular sealing grooves 121, the annular protrusions 221 are embedded in the annular sealing grooves 121 of the pump rear cavity 13, and the other end face of the sealing part 22 is squeezed by the pump chamber 12.

[0060] In this embodiment, the upper end face of the clamping part 23 is a flat surface, and the upper end face of the flat section 222 is horizontally flush with the upper end face of the clamping part 23, so that the pump rear cavity 13 simultaneously squeezes the upper end face of the clamping part 23 and the flat section 222, restricting the activity space of the sealing structure and ensuring the sealing effect.

[0061] Based on the one-piece structure of the diaphragm assembly 20, the annular protrusions 221 in each sealing structure need to be inserted into their respective annular sealing grooves 121. However, during installation, it is impossible to ensure that all annular protrusions 221 are simultaneously embedded in the annular sealing grooves 121, resulting in installation deviations and difficulty in positioning. Ultimately, this leads to deviations in the engagement between the annular protrusions 221 and the annular sealing grooves 121, resulting in poor sealing and leakage. Therefore, if... Figure 2 and Figure 3As shown, the diaphragm assembly 20 of Embodiment 1 includes a limiting part 25 located at the outer edge. The limiting part 25 is located radially outside the clamping part 23 and protrudes from the end face of the clamping part 23. A limiting groove 19 is provided between the pump rear cavity 13 and the pump chamber 12. The limiting part 25 is placed in the limiting groove 19. The limiting part 25 cooperates with the limiting groove 19 to pre-position the position of the diaphragm assembly 20. Then, the correspondence between each annular protrusion 221 and the annular sealing groove 121 is adjusted. After determining that each annular protrusion 221 corresponds to the annular sealing groove 121, the annular protrusion 221 is uniformly embedded into the corresponding annular sealing groove 121 to achieve flat installation of the diaphragm assembly 20. This avoids the annular protrusion 221 and the annular sealing groove 121 from being ground into powder due to repeated adjustments of the position of the diaphragm assembly 20, and also avoids the diaphragm assembly 20 from being twisted due to installation deviation.

[0062] The limiting part 25 is an annular shape that matches the outer edge shape of the diaphragm assembly 20, providing comprehensive positioning for the diaphragm assembly 20. This allows each annular protrusion 221 to quickly align with the annular sealing groove 121, ensuring a flat installation of the diaphragm assembly 20. Simultaneously, the annular limiting part 25 also improves the integrity of the diaphragm assembly 20 and enhances its tensile strength. Figure 3 In the first embodiment shown, the outer edge of the diaphragm assembly 20 is a rectangle with rounded corners, so the limiting portion 25 is also a rectangle with rounded corners; for example... Figure 2 As shown, the cross-section of the limiting part 25 is rectangular.

[0063] like Figure 5 In the second embodiment shown, the difference from the first embodiment is that the clamping part 23 only includes the annular area 231 and does not include the connecting area 232; at the same time, the outer contour of the diaphragm assembly 20 is flower-shaped, and the corresponding limiting part 25 is also flower-shaped. As a result, the length of the limiting part 25 is longer and the distance to the sealing part 22 is closer, which is beneficial for the pre-positioning of the diaphragm assembly 20; in this embodiment, the number of deformation structures 21 is 4, so the outer contour of the diaphragm assembly 20 is a four-petal flower shape, and the shape of the limiting part 25 is also a four-petal flower shape; the other structures of this embodiment are the same as those of the first embodiment, and will not be described again here.

[0064] like Figure 6 and Figure 7 In the illustrated embodiment three, the diaphragm assembly 20 includes several independent diaphragms, each diaphragm having its own deformable structure 21 and sealing structure. The sealing structure also includes a sealing portion 22 and a clamping portion 23. The clamping portion 23 includes only an annular region 231, and a limiting portion 25 is provided on the outer periphery of the annular region 231. Since each diaphragm is independent, they do not interfere with each other during installation, making it easier to embed the annular protrusion 221 of the sealing portion 22 into the annular sealing groove 121, thus facilitating installation. Other structures in this embodiment are the same as in embodiment one and will not be described again here.

[0065] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A diaphragm pump comprising a pump chamber module, a diaphragm assembly and an eccentric power assembly; the pump chamber module comprises a pump front cavity, a pump chamber and a pump rear cavity, the pump front cavity comprises a liquid inlet and a liquid outlet, the pump chamber is assembled between the pump front cavity and the pump rear cavity, and seals the pump front cavity to form a liquid inlet cavity communicated with the liquid inlet and a liquid outlet cavity communicated with the liquid outlet; the pump chamber module has a plurality of rotating liquid cavities, a liquid inlet one-way valve is arranged between the liquid inlet cavity and the rotating liquid cavities, and a liquid outlet one-way valve is arranged between the rotating liquid cavities and the liquid outlet cavity; the diaphragm assembly is respectively arranged in sealing with each of the rotating liquid cavities, and the eccentric power assembly is in transmission connection with the diaphragm assembly to alternately change the distance between the diaphragm assembly and the liquid inlet one-way valve in each of the rotating liquid cavities, so that each of the rotating liquid cavities is alternately communicated with the liquid inlet cavity to realize liquid suction or alternately communicated with the liquid outlet cavity to realize liquid discharge; characterized in that the diaphragm assembly comprises a deformation structure corresponding to each of the rotating liquid cavities and a sealing structure arranged at the outer periphery of the deformation structure, the sealing structure comprises a sealing part connected with the deformation structure and a clamping part located outside the sealing part and connected with the sealing part, and an annular sealing groove is arranged on the end face of the pump rear cavity and / or the pump chamber; the sealing part comprises an annular protrusion, the sealing part is clamped by the pump rear cavity and the pump chamber, and the annular protrusion is embedded in the annular sealing groove to form a seal, and at least part of the clamping part is arranged between the pump rear cavity and the pump chamber by clamping pressure.

2. The membrane pump of claim 1, wherein, the diaphragm assembly is a one-piece structure comprising a connecting part located in a middle region, the connecting part connects each of the sealing structures, and the deformation structure is distributed around the center of the diaphragm assembly as a center.

3. The membrane pump of claim 2, wherein, the connecting part is sealed and clamped by the end face of the pump rear cavity and the pump chamber.

4. The membrane pump of claim 2, wherein, the clamping part is shared between adjacent deformation structures, and the shared part of the clamping part is fixedly connected with the connecting part.

5. The membrane pump of claim 2, wherein, the diaphragm assembly comprises a limiting part located at the outer edge, the limiting part is arranged radially outside the clamping part and protrudes from the end face of the clamping part, and a limiting groove is arranged between the pump rear cavity and the pump chamber, and the limiting part is arranged in the limiting groove.

6. The membrane pump of claim 5, wherein, the limiting part is annular and matched with the shape of the outer edge of the diaphragm assembly.

7. The membrane pump of claim 2, wherein, the clamping part comprises an annular region matched with the outer periphery contour of the sealing part and a connecting region fixedly connecting adjacent annular regions, and the connecting region is fixedly connected with the connecting part.

8. The membrane pump of claim 1 or 2, wherein the lower end face of the clamping part and the upper end face of the pump chamber are both flat and abut each other in sealing.

9. The membrane pump of claim 2, wherein, the sealing part comprises a flat section fixed with the annular protrusion, the annular protrusion is arranged protruding from the lower end face of the flat section, the flat section is fixedly connected with the clamping part, the pump rear cavity extrudes the flat section, and the annular protrusion is interference-fitted with the annular sealing groove.

10. The membrane pump of claim 9, wherein, the upper end face of the flat section is horizontally flush with the upper end face of the end face of the clamping part.

Images