A piston carrier structure for a diaphragm pump and the diaphragm pump
By designing a piston holder structure, the piston boss extends circumferentially to form multiple end faces that contact the diaphragm, solving the problem of insufficient diaphragm pump flux. This achieves increased flux, reduced noise, and extended diaphragm life without changing the pump head size and speed.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU LEFOO IND
- Filing Date
- 2025-07-09
- Publication Date
- 2026-06-26
AI Technical Summary
Existing diaphragm pumps have difficulty increasing flow rate without changing pump head size and speed, especially since the flow rate requirements of commercial water purifiers are not being met, and increasing speed in traditional ways leads to increased noise.
A piston holder structure is designed in which the piston boss extends circumferentially along the piston holder body to form multiple end faces that contact the diaphragm, thereby increasing the contact area between the piston boss and the diaphragm, increasing the degree of diaphragm deformation, and thus increasing the volume change of the booster chamber and improving the throughput.
Without changing the pump head size and speed of the diaphragm pump, the throughput is significantly increased, while operating noise is reduced and the diaphragm life is extended.
Smart Images
Figure CN224413846U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of diaphragm pump technology, and in particular to a piston frame structure for a diaphragm pump and the diaphragm pump itself. Background Technology
[0002] The primary application of diaphragm booster pumps is in water purifiers, which are mainly used in two scenarios: household and commercial. Household water purifiers use diaphragm booster pumps with flow rates below 5L / min because these machines have low flow requirements, allowing for smaller pump sizes. Commercial water purifiers, on the other hand, have flow rates above 5L / min, necessitating larger flow rates from diaphragm booster pumps. Currently, the main commercially available diaphragm booster pump is the dual-head pump. However, dual-head pumps are relatively large, leading to the demand for increased single-head pump flow rates. Utility Model Content
[0003] This utility model provides a piston holder structure for a diaphragm pump and the diaphragm pump itself, in order to solve the problems in the prior art.
[0004] The technical solution adopted in this embodiment of the utility model is as follows:
[0005] A piston holder structure for a diaphragm pump includes a piston holder body and a plurality of piston bosses disposed on the end face of the piston holder body and evenly distributed along the circumference of the piston holder body. Each piston boss has a first end face that is annular or substantially annular, and a second end face that extends outward from the outer edge of one side of the first end face along the circumference of the piston holder body. The first end face and the second end face are located in the same plane and are both used to contact the diaphragm of the diaphragm pump to improve the flow rate of the diaphragm pump during operation.
[0006] Preferably, the second end face is located on the piston boss, on the side away from the center of the piston carrier body.
[0007] Preferably, the piston boss also has a third end face extending outward from the outer edge of the other side of the first end face along the circumference of the piston frame body. The first end face, the second end face, and the third end face are located in the same plane and are all used to contact the diaphragm of the diaphragm pump to improve the flow rate of the diaphragm pump during operation.
[0008] Preferably, the third end face is located on the piston boss, on the side away from the center of the piston frame body.
[0009] Preferably, the second end face and the third end face are symmetrically arranged on both sides of the first end face.
[0010] Preferably, the outer contour lines of the second end face and / or the third end face are smoothly connected to the outer contour lines of the first end face.
[0011] Preferably, the first end face, the second end face, and the third end face are integrally formed.
[0012] Preferably, the ratio of the maximum distance D from the outer contour line of the second end face to the center of the first end face to the outer radius d of the first end face is 1.1-1.3.
[0013] Preferably, the ratio of the maximum distance D from the outer contour line of the second end face to the center of the first end face to the outer radius d of the first end face is 1.2-1.23.
[0014] Preferably, the piston boss further comprises: a diaphragm fixing hole located in the middle of the piston boss for fixing the diaphragm to the piston boss; and a sealing rib located on the outer ring of the diaphragm fixing hole, wherein the sealing rib is in sealing contact with the diaphragm when the diaphragm is connected to the piston boss.
[0015] A diaphragm pump includes a fluid chamber, a diaphragm chamber, a diaphragm, a support, a motor, and a piston frame structure; the diaphragm chamber and the diaphragm are installed in a cavity formed by the fluid chamber and the support; a low-pressure chamber and a high-pressure chamber are formed between the fluid chamber and the diaphragm chamber, and a booster chamber is formed between the diaphragm chamber and the diaphragm; the output end of the motor is connected to the piston frame body, and the piston boss passes through a swing hole on the support and is connected to the diaphragm.
[0016] Preferably, the minimum gap between the outer edge of the piston boss and the swing hole is 2-8 mm.
[0017] The above-mentioned technical solutions adopted in the embodiments of this utility model can achieve the following beneficial effects:
[0018] Extending outward from the outer edge of the first end face along the circumference of the piston holder body, a second end face is formed, located on the same plane as the first end face. Compared to the piston boss in the prior art (which only has a first end face that is annular or tends to be annular), this increases the area of the piston boss acting on the diaphragm. During the operation of the diaphragm pump, this increases the degree of diaphragm deformation, increases the change in the volume of the booster chamber, and thus increases the amount of liquid sucked in and discharged each time. This improves the throughput of the diaphragm pump without changing the pump head size and speed. Furthermore, the first end face extends circumferentially along the piston holder body to increase the area of the piston boss end face, thereby increasing the contact area between the piston boss and the diaphragm, rather than extending radially along the piston holder body. This structure does not cause an increase in the stroke of the diaphragm edge, thus improving the throughput of the diaphragm pump without changing the pump head size and speed or affecting the diaphragm lifespan. Attached Figure Description
[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:
[0020] Figure 1 This is a three-dimensional structural diagram of the piston frame structure of this utility model;
[0021] Figure 2 This is a top view of the piston frame structure of this utility model;
[0022] Figure 3 This is a schematic diagram showing the partitioning of the first end face, the second end face, and the third end face of this utility model;
[0023] Figure 4 This is an exploded view of the diaphragm pump of this utility model;
[0024] Figure 5 This is a three-dimensional structural diagram of a piston carrier structure in the prior art.
[0025] Figure Labels
[0026] 1-Piston holder body; 2-Piston boss; 21-First end face; 22-Second end face; 23-Third end face; 24-Diaphragm fixing hole; 25-Sealing rib; 26-Round corner; 3-Fluorescence chamber; 4-Diaphragm chamber; 5-Diaphragm; 6-Bracket; 61-Oscillating hole; 7-Motor. Detailed Implementation
[0027] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.
[0028] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.
[0029] The piston holder, as the part that directly contacts the diaphragm pump diaphragm, is driven by a motor to cause the piston boss on the piston holder to swing, thereby driving the diaphragm to reciprocate. This causes the volume of the pressurization chamber between the diaphragm and the diaphragm chamber to continuously change, thus achieving liquid delivery. Without changing the pump head size, those skilled in the art generally increase the pump's throughput by increasing the rotational speed; however, increasing the rotational speed inevitably leads to increased noise. Therefore, this invention provides a piston holder structure for a diaphragm pump and a diaphragm pump with this piston holder structure, which increases the diaphragm pump's throughput without changing the pump head size or rotational speed.
[0030] refer to Figures 1 to 3As shown, a piston holder structure for a diaphragm pump includes a piston holder body 1 and a plurality of piston bosses 2 disposed on the end face of the piston holder body 1 and evenly distributed along the circumference of the piston holder body 1; each piston boss 2 has a first end face 21 that is annular or substantially annular, and a second end face 22 that extends outward from the outer edge of one side of the first end face 21 along the circumference of the piston holder body 1 (specifically, the second end face 22 is located on the piston boss 2 on the side away from the center of the piston holder body 1, such as...). Figure 3 As shown, the second end face 22 is located at the shoulder of the first end face 21. The first end face 21 and the second end face 22 are located on the same plane and are both used to contact the diaphragm 5 of the diaphragm pump to increase the flow rate of the diaphragm pump during operation (flow rate refers to the amount of water discharged per minute by the diaphragm booster pump under a specified outlet pressure).
[0031] The working principle of the diaphragm pump is as follows: A motor drives the piston frame structure to rotate, and several piston bosses 2 sequentially push the diaphragm 5 to reciprocate, causing the volume of the pressurization chamber between the diaphragm 5 and the diaphragm chamber to continuously change, thereby achieving liquid transport. In this embodiment, a second end face 22 is formed along the circumference of the piston frame body 1, extending outward from the outer edge of the first end face 21, and is located on the same plane as the first end face 21. Compared to existing piston bosses (such as...), this... Figure 5 As shown, it only has a first end face that is circular or tends to be circular, which increases the contact area between the piston boss 2 and the diaphragm 5 (after the piston boss is connected to the diaphragm, both the first end face and the second end face are in contact with the diaphragm). That is, it increases the area of the piston boss 2 acting on the diaphragm 5, which can increase the degree of deformation of the diaphragm 5 during the operation of the diaphragm pump (compared to the prior art, the part of the diaphragm corresponding to the second end face has a greater degree of deformation), increase the change in the volume of the booster chamber, and increase the amount of liquid sucked in and discharged each time, thereby increasing the throughput of the diaphragm pump without changing the pump head size and speed. Furthermore, the second end face 22 is formed by extending outward from the outer edge of the first end face 21 along the circumference of the piston holder body 1. In other words, the first end face 21 extends along the circumference of the piston holder body 1 to increase the area of the piston boss 2 end face, thereby increasing the contact area between the piston boss 2 and the diaphragm 5. It does not extend radially along the piston holder body 1 to increase the contact area between the piston boss 2 and the diaphragm 5. This structure does not cause the movement stroke of the diaphragm 5 edge to increase. Thus, the flow rate of the diaphragm pump is increased without changing the pump head size and speed of the diaphragm pump, or without affecting the service life of the diaphragm 5 (the piston boss increases radially along the piston holder body towards the direction away from the center of the piston holder body, which will cause the movement stroke of the diaphragm 5 edge to increase, thereby affecting the service life of the diaphragm).
[0032] In some practical applications, refer to Figure 3As shown, the piston boss 2 also has a third end face 23 extending outward from the outer edge of the first end face 21 on the circumference of the piston holder body 1. The first end face 21, the second end face 22, and the third end face 23 are located in the same plane and are all used to contact the diaphragm 5 of the diaphragm pump to improve the flow rate of the diaphragm pump during operation. Extending outward from the outer edge of the first end face 21 on the circumference of the piston holder body 1, a second end face 22 is formed that is in the same plane as the first end face 21; simultaneously, extending outward from the outer edge of the first end face 21 on the other side, a third end face 23 is formed that is in the same plane as the first end face 21. Compared with existing piston bosses (such as...), this is a significant improvement. Figure 5 As shown, it only has a first end face that is circular or tends to be circular, which further increases the contact area between the piston boss 2 and the diaphragm 5 (after the piston boss is connected to the diaphragm, the first end face, the second end face and the third end face are all in contact with the diaphragm). That is, it further increases the area of the piston boss 2 acting on the diaphragm 5, which can further increase the degree of deformation of the diaphragm 5 during the operation of the diaphragm pump (compared to the prior art, the parts of the diaphragm corresponding to the second end face and the third end face have a greater degree of deformation), further increasing the change in the volume of the booster chamber, so that more liquid is sucked in and discharged each time, thereby increasing the throughput of the diaphragm pump without changing the pump head size and speed. Furthermore, the second end face 22 is formed by extending outward from the outer edge of one side of the first end face 21 along the circumference of the piston holder body 1, and the third end face 23 is formed by extending outward from the outer edge of the other side of the first end face 21 along the circumference of the piston holder body 1. In other words, the first end face 21 extends along the circumference of the piston holder body 1 to increase the area of the piston boss 2 end face, thereby increasing the contact area between the piston boss 2 and the diaphragm 5. It does not extend radially along the piston holder body 1 to increase the contact area between the piston boss 2 and the diaphragm 5. This structure will not cause the movement stroke of the diaphragm 5 edge to increase, thereby increasing the flow rate of the diaphragm pump without changing the pump head size and speed of the diaphragm pump or affecting the service life of the diaphragm 5.
[0033] Specifically, refer to Figure 3 As shown, the third end face 23 is located on the piston boss 2, on the side away from the center of the piston carrier body 1, and the second end face 22 and the third end face 23 are symmetrically arranged on both sides of the first end face 21. Figure 3 As shown, the second end face 22 and the third end face 23 are located at the shoulder of the first end face 21. The second end face 22 and the third end face 23 are symmetrically distributed, which can increase the flux while maintaining the stability of the movement stroke of the diaphragm 5. The diaphragm 5 is subjected to uniform force, which also helps to extend the service life of the diaphragm 5.
[0034] In some practical applications, based on any of the above implementation methods: (Refer to...) Figures 1 to 3As shown, the outer contour lines of the second end face 22 and / or the third end face 23 are smoothly connected to the outer contour line of the first end face 21 (generally, the first end face 21, the second end face 22 and the third end face 23 are integrally formed) to avoid damage to the diaphragm 5.
[0035] In addition, a rounded corner 26 is formed at the outer edge of the piston boss 2 surface (e.g. Figure 1 The rounded corners 26 on the outer edge make the contact transition between the piston boss 2 and the diaphragm 5 smoother.
[0036] In some practical applications, refer to Figure 3 As shown, the ratio of the maximum distance D from the outer contour line of the second end face 22 to the center of the first end face 21 to the outer radius d of the first end face 21 is 1.1-1.3. Further, the ratio of the maximum distance D from the outer contour line of the second end face 22 to the center of the first end face 21 to the outer radius d of the first end face 21 is 1.2-1.23. In actual production, the outer radius d of the first end face 21 can be 10.4 mm, and D can be 12.5 mm.
[0037] In some practical applications, the piston boss 2 also has a diaphragm fixing hole 24 and a sealing rib 25. The diaphragm fixing hole 24 is located in the middle of the piston boss 2 and is used to fix the diaphragm 5 to the piston boss 2; the sealing rib 25 is located on the outer ring of the diaphragm fixing hole 24, and when the diaphragm 5 is connected to the piston boss 2, the sealing rib 25 is in sealing contact with the diaphragm 5.
[0038] When the motor drives the piston frame body 1 to move, the piston boss 2 sequentially presses the diaphragm 5, and the volume of the pressurization chamber between the diaphragm 5 and the diaphragm chamber changes continuously. During this process, the diaphragm 5 is fixed on the piston boss 2 through the diaphragm fixing hole 24, and the sealing rib 25 ensures the sealing of the connection between the diaphragm 5 and the piston boss 2.
[0039] A diaphragm pump includes a fluid chamber 3, a diaphragm chamber 4, a diaphragm 5, a support 6, a motor 7, and a piston frame structure as described above. The diaphragm chamber 4 and the diaphragm 5 are installed within the cavity formed by the fluid chamber 3 and the support 6. A low-pressure chamber and a high-pressure chamber are formed between the fluid chamber 3 and the diaphragm chamber 4, and a booster chamber (the space above the diaphragm 5) is formed between the diaphragm chamber 4 and the diaphragm 5. The output end of the motor 7 is connected to the piston frame body 1, and the piston boss 2 passes through a swing hole 61 on the support 6 and connects to the diaphragm 5. Specifically, the minimum gap between the outer edge of the piston boss 2 and the swing hole 61 is 2-8 mm, which makes reasonable use of space while avoiding interference between the piston boss 2 and the support 6, ensuring the normal operation of the piston boss 2.
[0040] In this embodiment, when the motor 7 starts, its output end drives the piston frame body 1 to rotate, causing the piston boss 2 to swing (achieved through the eccentric structure of the piston frame body, which is a mature existing technology in the field of diaphragm pumps and will not be described in detail). Since the piston boss 2 is connected to the diaphragm 5 through the swing hole 61 on the bracket 6, the rotation of the piston frame body 1 causes several piston bosses 2 to sequentially push the diaphragm 5 to reciprocate.
[0041] When the piston boss 2 pushes the diaphragm 5 towards the pressurization chamber, the volume of the pressurization chamber decreases and the pressure increases. At this time, the liquid in the low-pressure chamber cannot flow back under the action of the one-way valve, while the liquid in the pressurization chamber is squeezed into the high-pressure chamber, thus realizing the pressurization and transportation of the liquid.
[0042] When piston boss 2 swings back, the volume of the booster chamber increases and the pressure decreases. Due to the action of a check valve and other structures, the liquid in the high-pressure chamber does not flow back, while the liquid in the low-pressure chamber is drawn into the booster chamber for the next pressurization cycle. This cycle repeats continuously, allowing the diaphragm pump to continuously pressurize the low-pressure liquid and deliver it to the high-pressure chamber.
[0043] Unlike the traditional method of increasing throughput by increasing the speed of motor 7, this diaphragm pump increases throughput by increasing the contact area between piston boss 2 and diaphragm 5 without increasing speed. Therefore, it generates less noise during operation. Furthermore, the increased end face area of piston boss 2 consists of the second end face 22 and the third end face 23 arranged along the circumference of piston frame body 1. This allows the diaphragm pump to increase throughput without changing the pump head size and speed or affecting the service life of diaphragm 5.
[0044] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.
Claims
1. A piston holder structure for a diaphragm pump, comprising a piston holder body (1) and a plurality of piston bosses (2) disposed on the end face of the piston holder body (1) and uniformly distributed along the circumference of the piston holder body (1), characterized in that: The piston boss (2) has a first end face (21) that is annular or substantially annular, and a second end face (22) that extends outward from the outer edge of the first end face (21) along the circumference of the piston frame body (1). The first end face (21) and the second end face (22) are located in the same plane and are both used to contact the diaphragm of the diaphragm pump to increase the flow rate of the diaphragm pump during operation.
2. The piston holder structure for a diaphragm pump according to claim 1, characterized in that: The second end face (22) is located on the piston boss (2) on the side away from the center of the piston frame body (1).
3. The piston holder structure for a diaphragm pump according to claim 1, characterized in that: The piston boss (2) also has a third end face (23) extending outward from the outer edge of the other side of the first end face (21) along the circumference of the piston frame body (1). The first end face (21), the second end face (22) and the third end face (23) are located on the same plane and are all used to contact the diaphragm of the diaphragm pump to improve the flow rate of the diaphragm pump during operation.
4. The piston holder structure for a diaphragm pump according to claim 3, characterized in that: The third end face (23) is located on the piston boss (2) on the side away from the center of the piston frame body (1).
5. The piston holder structure for a diaphragm pump according to claim 3, characterized in that: The second end face (22) and the third end face (23) are symmetrically arranged on both sides of the first end face (21).
6. The piston holder structure for a diaphragm pump according to claim 3, characterized in that: The outer contour lines of the second end face (22) and / or the third end face (23) are smoothly connected to the outer contour lines of the first end face (21).
7. The piston holder structure for a diaphragm pump according to claim 3, characterized in that: The first end face (21), the second end face (22) and the third end face (23) are integrally formed.
8. The piston holder structure for a diaphragm pump according to claim 1, characterized in that: The ratio of the maximum distance D from the outer contour line of the second end face (22) to the center of the first end face (21) to the outer radius d of the first end face (21) is 1.1-1.
3.
9. The piston holder structure for a diaphragm pump according to claim 8, characterized in that: The ratio of the maximum distance D from the outer contour line of the second end face (22) to the center of the first end face (21) to the outer radius d of the first end face (21) is 1.2-1.
23.
10. The piston holder structure for a diaphragm pump according to claim 1, characterized in that: The piston boss (2) also has: The diaphragm fixing hole (24) is located in the middle of the piston boss (2) and is used to fix the diaphragm to the piston boss (2); The sealing rib (25) is located on the outer ring of the diaphragm fixing hole (24). When the diaphragm is connected to the piston boss (2), the sealing rib is in sealing contact with the diaphragm.
11. A diaphragm pump, characterized in that: The device includes a fluid chamber (3), a diaphragm chamber (4), a diaphragm (5), a support (6), a motor (7), and a piston frame structure as described in any one of claims 1-10; the diaphragm chamber (4) and the diaphragm (5) are installed in the cavity formed by the fluid chamber (3) and the support (6); a low-pressure chamber and a high-pressure chamber are formed between the fluid chamber (3) and the diaphragm chamber (4), and a pressurization chamber is formed between the diaphragm chamber (4) and the diaphragm (5); the output end of the motor (7) is connected to the piston frame body (1), and the piston boss (2) passes through the swing hole (61) on the support (6) and is connected to the diaphragm (5).
12. The diaphragm pump according to claim 11, characterized in that: The minimum gap between the outer edge of the piston boss (2) and the swing hole (61) is 2-8mm.