Diaphragm pump and pump head structure

Abstract

The present invention discloses a diaphragm pump and its pump head structure, the pump head structure comprising: a transmission head, a diaphragm and a valve seat arranged in sequence along the direction of the motor output shaft, the diaphragm having a first surface matched with the transmission head and a second surface matched with the valve seat; a plurality of wading parts that can contact with the fluid are arranged on the second surface, a boosting cavity is formed between each of the wading parts and the valve seat, and the area ratio of the wading parts to the diaphragm is 50%-70%. The diaphragm pump and its pump head structure of the present invention can improve the parameters such as the water flow rate and working efficiency of the diaphragm pump while ensuring that the volume of the diaphragm pump remains unchanged and the structural durability is good, thereby meeting the user's requirements for high performance, low cost, low noise, and miniaturization of the diaphragm pump.

Description

Technical Field

[0001] The present invention relates to the technical field of diaphragm pumps, and in particular to a diaphragm pump and a pump head structure thereof. Background Art

[0002] A diaphragm pump is a mechanical structure that transports liquid or pressurizes liquid through a diaphragm. Existing diaphragm pumps can use a reciprocating drive to drive the diaphragm to deform to achieve the purpose of sucking liquid; they can also use a drive such as a nutating disk or a swinging disk to drive the diaphragm to deform to achieve the purpose of sucking liquid. Diaphragm pumps are widely used in industries such as water purification.

[0003] The diaphragm pumps currently provided by manufacturers are largely standardized into several fixed models. Different models of diaphragm pumps correspond to predetermined water flow rates and fixed volume parameters. Generally, the greater the water flow rate of a diaphragm pump, the larger its volume.

[0004] However, when the internal space of the water purification system is limited, it can only install a diaphragm pump with a predetermined water flow rate. If you want to install a diaphragm pump with higher working parameters such as water flow rate than the same model in a limited space, it is necessary to further improve the existing diaphragm pump. Summary of the invention

[0005] The object of the present invention is to provide a diaphragm pump and a pump head structure thereof, which can improve parameters such as the water output flow rate and working efficiency of the diaphragm pump while ensuring that the volume of the diaphragm pump remains unchanged and the structural durability is good, thereby meeting the user's needs for high performance, low cost, low noise, and miniaturization of the diaphragm pump.

[0006] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0007] A pump head structure comprises: a transmission head, a diaphragm and a valve seat which are arranged in sequence along the direction of a motor output shaft, wherein the diaphragm has a first surface which matches with the transmission head and a second surface which matches with the valve seat; a plurality of wading parts which can contact with a fluid are arranged on the second surface, a pressurizing chamber is formed between each of the wading parts and the valve seat, and the area ratio of the wading parts to the diaphragm is 50%-70%.

[0008] Furthermore, the diaphragm includes a sealing portion having a size not less than a preset size and arranged between the edge of the diaphragm and the water-wading portion and cooperating with the valve seat.

[0009] Furthermore, the second surface of the diaphragm is provided with reinforcing ribs on the sealing portion between two adjacent water-wading portions.

[0010] Furthermore, the edge of the wading portion is an arc-shaped transition.

[0011] Furthermore, the shape formed by the edge of the wading portion includes any one of the following: an ellipse, an irregular circular shape.

[0012] Furthermore, the transmission head is provided with a balance wheel matching the number of the wading parts, and the area ratio of the balance wheel to the wading parts is 70% to 90%, wherein the area ratio of the balance wheel to the water wading parts is the projection area ratio of the balance wheel and the water wading parts on the same reference plane along the direction of the motor output shaft.

[0013] Furthermore, the cross section of the balance wheel is elliptical.

[0014] Furthermore, the ratio of the minimum distance from the outermost wall of the boosting chamber to the periphery of the pump head to the diameter of the pump head is 4% to 6%.

[0015] Furthermore, the ratio of the minimum distance between the walls of two adjacent boosting chambers to the diameter of the pump head is 8% to 10%.

[0016] Furthermore, the number of the boost chambers is 3, and the 3 boost chambers are evenly distributed around the motor output shaft.

[0017] Furthermore, the cross-sectional shape of the boost chamber is elliptical or irregularly circular.

[0018] Furthermore, the first surface of the diaphragm abuts against the pump cover, the transmission head is provided with a balance wheel matching the number of the wading parts, and the pump cover is provided with an opening for penetrating the balance wheel.

[0019] Furthermore, the opening and the balance wheel are clearance-matched, and the clearance between the two is between 0.8 mm and 1.5 mm.

[0020] Furthermore, the area occupied by the balance wheel is 42% to 60% of the cross-sectional area of ​​the entire pump head.

[0021] Furthermore, the opening is an elliptical hole.

[0022] Furthermore, the area ratio of the water-wading portion to the diaphragm is: the projection area ratio of the water-wading portion and the diaphragm on the same reference plane along the direction of the motor output shaft.

[0023] A diaphragm pump comprises: a pump head structure as described above, and a motor providing driving force for the transmission head.

[0024] Furthermore, the rotation speed of the motor is between 1200RPM and 1800RPM, the output torque is between 0.4NM and 0.8NM, and the flow rate of the diaphragm pump is between 4LPM and 8LPM.

[0025] It can be seen from the technical solution provided in the above implementation mode of the present application that: by optimizing the structure of the diaphragm in the pump head structure and the transmission head and valve seat matched therewith, the area ratio of the water-related part of the diaphragm that can affect the efficiency of the diaphragm pump is increased, and the volume utilization rate of the pump head structure is maximized (especially the area ratio of the boosting chamber is increased, and the utilization rate of the volume in the boosting chamber is increased) while ensuring the total volume, long-term reliability, and safety of the diaphragm pump, thereby improving the water output flow rate and working efficiency of the diaphragm pump.

[0026] Experimental data verification shows that: under the condition of the same motor speed, the diaphragm pump using the pump head structure provided in the present application has a flow rate that is significantly larger than that of the diaphragm pump using the existing pump head structure under the same motor speed; under the same flow rate, the diaphragm pump using the pump head structure provided in the present application can effectively reduce the motor speed, thereby reducing the reciprocating fatigue wear of the diaphragm, thereby increasing the life of the diaphragm pump and reducing the noise of the diaphragm pump.

[0027] With reference to the following description and accompanying drawings, the specific embodiments of the present application are disclosed in detail, indicating the way in which the principles of the present application can be adopted. It should be understood that the embodiments of the present application are not limited in scope. The embodiments of the present application include many changes, modifications and equivalents.

[0028] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0029] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of a pump head in one embodiment of the present application;

[0031] Figure 2 is an exploded view of a pump head structure in one embodiment of the present application;

[0032] Figure 3 This is a schematic structural diagram of a diaphragm of a pump head structure in one embodiment of the present application;

[0033] Figure 4 This is a front view of the diaphragm of the pump head structure in one embodiment of the present application;

[0034] Figure 5is a top view of a diaphragm of a pump head structure in one embodiment of the present application;

[0035] Figure 6 is a rear view of a diaphragm of a pump head structure in one embodiment of the present application;

[0036] Figure 7 This is a schematic structural diagram of a middle valve seat of a pump head structure in one embodiment of the present application;

[0037] Figure 8 This is a front view of a middle valve seat of a pump head structure in one embodiment of the present application;

[0038] Fig. 9 is a rear view of a middle valve seat of a pump head structure in one embodiment of the present application;

[0039] Fig.10 This is a schematic structural diagram of a middle transmission head of a pump head structure in one embodiment of the present application;

[0040] Fig.11 is a top view of a middle transmission head of a pump head structure in one embodiment of the present application;

[0041] Fig.12 This is a schematic structural diagram of a middle pump cover of a pump head structure in one embodiment of the present application;

[0042] Fig.13 is a top view of a middle pump cover of a pump head structure in one embodiment of the present application;

[0043] Fig.14 It is a schematic diagram of the overall structure of a diaphragm pump provided in an embodiment of the present application;

[0044] Fig.15 It is a schematic diagram comparing the water outlet pressure and water outlet flow rate of the diaphragm pump provided in the embodiment of the present application and the existing diaphragm pump under the premise of the same rotation speed and the same eccentric wheel.

[0045] Description of reference numerals:

[0046] 1. Diaphragm; 11. First surface; 111. Fitting part; 12. Second surface; 121. Water-wading part; 122. Sealing part; 123. Reinforcing rib; 2. Valve seat; 21. Water inlet part; 22. Water outlet part; 20. Pressurization chamber; 3. Transmission head; 31. Balance wheel; 4. Pump cover; 41. Opening; 5. Motor; 6. Upper cover; 7. Eccentric wheel; 8. Bearing. DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that these implementation methods are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0048] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0050] In order to meet users' demands for high performance, low cost, low noise, and miniaturization of diaphragm pumps, this application improves the internal structure of the diaphragm pump while ensuring that the volume of the diaphragm pump remains unchanged and the structural durability is good, thereby improving the working parameters of the diaphragm pump and greatly improving the water flow rate and working efficiency.

[0051] One embodiment of the present application provides a pump head structure, which is mainly used in a diaphragm pump.

[0052] See also Figures 1 to 14The working principle of the diaphragm pump is as follows: when the output shaft of the motor 5 rotates, it will drive the inclined eccentric wheel 7 to rotate; a bearing 8 is arranged between the inclined eccentric wheel 7 and the transmission head 3. Due to the presence of a predetermined eccentric angle, the eccentric wheel 7 can drive the balance wheel 31 on the transmission head 3 to reciprocate up and down in sequence along the direction of the output shaft of the motor 5 when it rotates; the wading part 121 on the diaphragm 1 is also synchronously pushed up or pulled down in sequence to produce repeated up and down displacements. Specifically, when the balance wheel 31 of the transmission head 3 moves downward, the water-wading portion 121 of the diaphragm 1 and the piston push block (not shown in the figure) are simultaneously pulled downward, so that the piston plate of the valve seat 2 is pushed open, and the tap water can enter the boosting chamber 20 through the water inlet hole on the valve seat 2; when the balance wheel 31 of the transmission head 3 moves upward, the water-wading portion 121 and the piston of the diaphragm 1 are also simultaneously pushed upward, and the water in the boosting chamber 20 is squeezed, so that the water pressure increases to a predetermined pressure range; the high-pressure water after boosting can push open the anti-return rubber pad on the water outlet portion 22 of the valve seat 2, and the high-pressure water enters the high-pressure water chamber through the water outlet hole of the water outlet portion 22.

[0053] Please refer to Figures 3 to 6 The pump head structure includes: a transmission head 3, a diaphragm 1 and a valve seat 2 arranged in sequence along the output shaft direction of the motor 5. The diaphragm 1 has a first surface 11 that matches the transmission head 3 and a second surface 12 that matches the valve seat 2. The second surface 12 is provided with a plurality of wading parts 121 that can contact with the fluid. A boosting chamber 20 is formed between each of the wading parts 121 and the valve seat 2. The area ratio of the wading part 121 to the diaphragm 1 is: 50%-70%.

[0054] In this embodiment, the diaphragm 1 has a first surface 11 that can cooperate with the transmission head 3 of the diaphragm pump and a second surface 12 that can cooperate with the valve seat 2 of the diaphragm pump. Among them, the second surface 12 is provided with a plurality of wading parts 121 that can contact with the fluid. The fluid mainly varies according to the different application scenarios of the diaphragm pump, and the present application does not make specific restrictions here. For example, when the diaphragm pump is used in a water purification system, the fluid can be water. The first surface 11 is provided with a matching part 111, which is used to cooperate with the transmission head 3 for positioning. The driving force of the transmission head 3 received at the matching part 111 is transmitted to the corresponding components in the valve seat 2 through the wading part 121, so that the corresponding components in the valve seat 2 can be synchronously driven by the transmission head 3.

[0055] Please refer to Figures 7 to 9In this embodiment, a pressurizing chamber 20 can be formed between each of the water-wading portions 121 and the valve seat 2. Specifically, the valve seat 2 can be provided with a plurality of water inlet portions 21 equal in number to the water-wading portions 121, and a water outlet portion 22 that can be connected to the water inlet portions 21. The water inlet portion 21 can cooperate with the water-wading portion 121 to form the pressurizing chamber 20.

[0056] Specifically, the number of the boost chambers 20 can be 3, and the 3 boost chambers 20 are evenly distributed around the output shaft of the motor 5. The number of the boost chambers 20 is preferably 3. On the one hand, the fewer the number of boost chambers 20, the more conducive it is to increase the area ratio of the boost chamber 20 to the pump head; on the other hand, the fewer the number of boost chambers 20, the fewer the number of independent boost chambers 20 superimposed on the premise that the failure probability of each boost chamber 20 is equal, and the smaller the total failure probability. The boost chamber 20 is the core structure of the pump head structure. The smaller the failure probability of the boost chamber 20, the more conducive it is to ensure the reliability of the pump head structure. The area ratio of the boost chamber 20 to the pump head is specifically: the projection area ratio of the boost chamber 20 and the pump head along the output shaft direction of the motor 5 on the same reference plane. Of course, the number of the boost chambers 20 can also be 4 or more, and multiple boost chambers 20 can be evenly distributed around the output shaft. Specifically, this application will not be discussed here.

[0057] Among them, since the diaphragm 1 needs to undergo a certain deformation when it is in direct contact with the transmission head 3, the material of the diaphragm 1 can be elastic plastic, rubber or other materials to meet its deformation requirements. Each wading portion 121 has a relatively closed outer contour. When sharp corners appear on the diaphragm 1, the diaphragm 1 made of elastic material is prone to failure at the sharp corners. In order to ensure the reliability of the diaphragm 1 during use and avoid damage to the diaphragm 1 at sharp corners, the edge of the outer contour of the wading portion 121 is an arc transition.

[0058] Specifically, the shape formed by the edge of the wading portion 121 includes any one of the following: an ellipse, an irregular circular shape. Of course, the shape formed by the edge of the wading portion 121, that is, the outer contour of the wading portion 121, can also be other arc-shaped transition shapes, such as an arc-shaped transition fan shape, etc.

[0059] In the present application, the area ratio of the wading portion 121 to the diaphragm 1 is between 50% and 70%. It should be noted that since the wading portion 121 and the diaphragm 1 are in a three-dimensional shape, the area ratio of the wading portion 121 to the diaphragm 1 can be specifically: the projection area ratio of the wading portion 121 and the diaphragm 1 on the same reference plane along the output shaft direction of the motor 5.

[0060] In general, the area ratio of the wading portion 121 to the diaphragm 1 is greater than the area ratio of the wading portion 121 with a circular outer contour to the diaphragm 1. When the area ratio of the wading portion 121 to the diaphragm 1 is less than 50%, the flow characteristics of the diaphragm pump are low; when the area ratio of the wading portion 121 to the diaphragm 1 is higher than 70%, the reliability (including life, strength, sealing, etc.) of the diaphragm pump will decrease.

[0061] In the implementation mode of the application, by optimizing the structures of the diaphragm 1 in the pump head structure and the transmission head 3 and valve seat 2 matched therewith, the area ratio of the water-related portion 121 in the diaphragm 1 which can affect the efficiency of the diaphragm pump is increased, and the volume utilization of the pump head structure is maximized while ensuring the total volume, long-term reliability, and safety of the diaphragm pump, thereby improving the water output flow rate and working efficiency of the diaphragm pump.

[0062] The above-mentioned ratio of the area of ​​the water-wading portion 121 to the area of ​​the diaphragm 1 is optimized under the premise of ensuring the overall structural strength and sealing performance. Figures 3 to 6 The diaphragm 1 includes a sealing portion 122 with a size not less than a preset size, which is arranged between the edge of the diaphragm 1 and the water-wading portion 121 and cooperates with the valve seat 2.

[0063] Specifically, when the wading portion 121 of the diaphragm 1 cooperates with the valve seat 2, the diaphragm 1, except for the wading portion 121 used to form the boost chamber 20, is mainly used to form the sealing portion 122. Furthermore, in order to ensure that the diaphragm 1 has a certain strength, the second surface 12 of the diaphragm 1 may be provided with a reinforcing rib 123 on the sealing portion 122 between two adjacent wading portions 121.

[0064] Due to the existence of the eccentric angle θ of the eccentric wheel 7, the projected area of ​​the boosting chamber 20 and the wading part 121 along the output shaft direction of the motor 5 has the following relationship: the projected area S1 of the boosting chamber 20 along the output shaft direction of the motor 5 = the projected area S2 of the wading part 121 along the output shaft direction of the motor 5 × cosθ. In other words, the projected area of ​​the boosting chamber 20 in the direction of the output shaft direction of the motor 5 corresponds to the projected area of ​​the wading part 121 in the direction of the output shaft direction of the motor 5. The larger the projected area of ​​the wading part 121 in the direction of the output shaft direction of the motor 5, the larger the projected area of ​​the boosting chamber 20 in the direction of the output shaft direction of the motor 5. When the area ratio of the wading part 121 to the diaphragm 1 is increased, it is equivalent to increasing the area ratio of the boosting chamber 20. When the area ratio of the boosting chamber 20 is increased, the volume of water pumped into the boosting chamber 20 at a single time can be increased, thereby improving the unit flow rate and working efficiency of the diaphragm pump.

[0065] In some embodiments of the present specification, under the premise that the size of the pump head remains unchanged, in order to maximize the area ratio of the boosting chamber 20, the cross-sectional shape of the boosting chamber 20 is an ellipse or an irregular circular shape. The area ratio of the boosting chamber 20 can be determined by projecting the boosting chamber 20 and the pump head along the output shaft direction of the motor 5 onto the same reference plane. Figure 1 As shown, the main body of the boosting chamber 20 can be formed by a water inlet 21 of the valve body. Accordingly, the water inlet 21 is provided with an elliptical or irregular circular hole.

[0066] In the following embodiments, the cross-sectional shape of the boost chamber 20 is mainly elliptical as an example for description. The boost chamber 20 of other shapes can be referred to by analogy with the elliptical boost chamber 20, and the present application will not elaborate on them one by one here.

[0067] In one embodiment, the ratio of the minimum distance from the outermost wall of the boosting chamber 20 to the periphery of the pump head to the pump head diameter is 4% to 6%, and the ratio of the minimum distance between the walls of two adjacent boosting chambers 20 to the pump head diameter is 8% to 10%.

[0068] Among them, the first surface 11 of the diaphragm 1 is also provided with a pump cover 4 that cooperates with the upper cover 6 to limit the diaphragm 1. Specifically, the outer edge of the first surface 11 of the diaphragm 1 abuts against the pump cover 4, and the sealing portion 122 of the second surface 12 of the diaphragm 1 is sealed and matched with the valve seat 2. In order to ensure the sealing, structural strength and clearance installation requirements of the transmission head 3, the outermost cavity wall of the boosting chamber 20 (the position of the cavity wall of the boosting chamber 20 closest to the periphery of the pump head) to the periphery of the pump head (the periphery corresponding to the pump head diameter) needs to meet a predetermined minimum distance. Specifically, the minimum distance can be matched with the model of the diaphragm pump. Generally, the larger the diameter of the pump head of the diaphragm pump, the larger the minimum distance.

[0069] For example, for a diaphragm pump with a pump head diameter of 76 mm (millimeter), the minimum distance from the outermost wall of the boost chamber 20 to the periphery of the pump head is about 3.37 mm. Among them, the ratio of the minimum distance from the outermost wall of the boost chamber 20 to the periphery of the pump head (3.37 mm) to the pump head diameter (76 mm) is 4.43%. This minimum distance mainly takes into account the sealing requirements of the pump head at the diaphragm 1 and the assembly clearance requirements between the transmission head 3 and the pump cover 4. Among them, the swing wheel of the transmission head 3 will reciprocate axially along the output shaft during use. In order to ensure that the transmission head 3 does not interfere with the pump cover 4 during use, the transmission head 3 and the pump cover 4 need to be at least 0.95 mm apart.

[0070] In order to ensure the requirements of sealing and strength, the walls of two adjacent boosting chambers 20 need to meet a predetermined minimum distance. Specifically, the minimum distance can be matched with the model of the diaphragm pump. Generally, the larger the pump head diameter of the diaphragm pump, the larger the minimum distance. For example, for a diaphragm pump with a pump head diameter of 76 mm (millimeter), the minimum distance is about 6.5 mm, and the ratio of the minimum distance between the walls of two adjacent boosting chambers 20 (6.5 mm) to the pump head diameter (76 mm) is 8.55%.

[0071] The applicant found that when the ratio of the minimum distance from the outermost cavity wall of the boosting cavity 20 to the periphery of the pump head to the diameter of the pump head is 4% to 6%, and the ratio of the minimum distance between the cavity walls of two adjacent boosting cavities 20 to the diameter of the pump head is 8% to 10%, the projection area of ​​the boosting cavity 20 in the direction of the output shaft of the motor 5 can be maximized while ensuring the overall strength and sealing of the structure. That is, the area ratio of the boosting cavity 20 is increased. When the area ratio of the boosting cavity 20 is increased, the volume of the boosting cavity 20 can be increased, which is conducive to improving the unit flow rate and working efficiency of the boosting pump.

[0072] Hereinafter, the area ratio of the diaphragm 1 occupied by the elliptical shape enclosed by the edge of the wading portion 121 (referred to as the elliptical area ratio in the following calculation) is compared with the area ratio of the diaphragm 1 occupied by the existing circular wading portion 121 (referred to as the circular area ratio in the following calculation).

[0073]

[0074] A: The semi-major axis radius of the contact point between the pump cover and the diaphragm (the wading part) is 14.75mm;

[0075] B: The radius of the short semi-axis at the contact point between the pump cover and the diaphragm (the wading part) is 17mm;

[0076] T: number of booster chambers, take 3;

[0077]

[0078] r: The radius of the contact point between the pump cover and the diaphragm (the wading part), which is 13.25mm;

[0079] T: number of booster chambers, take 3;

[0080] By comparing the above-mentioned elliptical area ratio with the existing circular area ratio, it can be seen that the elliptical area ratio provided by the present application is much larger than the existing circular area ratio. When the area ratio of the wading portion 121 to the diaphragm 1 is increased, it is equivalent to increasing the area ratio of the boosting chamber 20. When the area ratio of the boosting chamber 20 is increased, the volume of the boosting chamber 20 is increased, which is beneficial to improving the unit flow rate and working efficiency of the boosting pump. In other words, the pump head structure provided by the present application can help improve the unit flow rate of the diaphragm pump and thus improve the working efficiency of the diaphragm pump under the premise that the volume of the diaphragm pump remains unchanged.

[0081] When the area ratio of the diaphragm pump is within a reasonable range, it can ensure that the diaphragm pump can maximize the use of the volume in the pump head structure and increase the volume of the boosting chamber 20 under the premise of the total volume remaining unchanged and long-term reliable and safe operation, thereby improving the working efficiency of the diaphragm pump. In this embodiment, the area ratio of the boosting chamber 20 can be between 70% and 90%. When the area ratio of the boosting chamber 20 is too small, for example, the area ratio of the boosting chamber 20 of the existing diaphragm pump is usually less than 60%, the flow characteristics corresponding to the boosting pump are poor; and when the area ratio of the boosting chamber 20 is greater than 90%, it may affect the sealing type and structural reliability of the diaphragm pump.

[0082] Please refer to Figure 10 to Figure 11 , the area of ​​the wading portion 121 of the diaphragm 1 and the area of ​​the balance wheel 31 of the transmission head 3 also have a matching corresponding relationship. Under the premise that the outer contour areas of the diaphragm 1 and the transmission head 3 remain unchanged, when the area of ​​the wading portion 121 of the diaphragm 1 increases, the area of ​​the balance wheel 31 of the transmission head 3 also increases accordingly. When the two cooperate, the effective area of ​​the balance wheel 31 of the transmission head 3 acting on the wading portion 121 of the diaphragm 1 is larger, which is more conducive to improving the utilization rate of the volume of the boosting chamber 20, thereby improving the unit flow rate and working efficiency of the diaphragm pump.

[0083] In one embodiment, the transmission head 3 is provided with a balance wheel 31 matching the number of the wading parts 121, and the area of ​​the balance wheel 31 accounts for 70% to 90% of the area of ​​the wading parts 121. The area ratio of the balance wheel 31 to the wading parts 121 is the projection area ratio of the balance wheel 31 and the wading parts 121 on the same reference plane along the output shaft direction of the motor 5.

[0084] In a specific implementation, the cross-section of the balance wheel 31 is elliptical as an example to illustrate the degree to which the unit flow rate and working efficiency of the diaphragm pump are improved compared with the existing diaphragm pump.

[0085] Existing diaphragm pump unit flow:

[0086]

[0087] The meaning of each letter is as shown in the figure above:

[0088] Where ψ is the eccentric angle, which is 3.5°;

[0089] R1 is 20.5mm; R2 is 11.75mm; R3 is 15mm;

[0090] The unit flow rate of the diaphragm pump provided in this application is:

[0091]

[0092] The meanings of the newly added letters are as follows:

[0093] a: The radius of the long semi-axis of the transmission head is 15.15mm; b: The radius of the short semi-axis of the transmission head is 12.25mm;

[0094] A: The radius of the long semi-axis of the pump cover is 14.75mm; B: The radius of the short semi-axis of the pump cover is 17mm;

[0095]

[0096] In general, the working efficiency of the diaphragm pump provided in the present application can be improved by about 38.9% compared with the existing diaphragm pumps.

[0097] Please refer to Fig.15 , which is a schematic diagram comparing the outlet water pressure and outlet water flow rate of the diaphragm pump provided in the embodiment of the present application and the traditional diaphragm pump under the premise of the same speed and the same eccentric wheel 7. Under the premise of the same motor 5 speed and the same eccentric wheel 7, the diaphragm pump provided in the present application has a significantly improved working efficiency compared with the traditional diaphragm pump.

[0098] In addition, please refer to Table 1, which is a comparison table of test data between a diaphragm pump having a pump head structure provided by the present application and a conventional diaphragm pump. The only variable in the test process is "different motor speeds", and the others are the same.

[0099] Table 1

[0100]

[0101] It can also be clearly seen from Table 1 that for a 1000G (gallon) diaphragm pump, at the same motor 5 speed, the diaphragm pump using the pump head structure provided by the present application has a significantly larger flow rate than the diaphragm pump using the traditional pump head structure at the same motor 5 speed. At the same flow rate, the diaphragm pump using the pump head structure provided by the present application can effectively reduce the motor 5 speed, thereby reducing the reciprocating fatigue wear of the diaphragm 1, thereby increasing the life of the diaphragm pump and reducing the noise of the diaphragm pump.

[0102] See also Fig.12 and Fig.13 In one embodiment, the first surface 11 of the diaphragm 1 abuts against the pump cover 4, the transmission head 3 is provided with a balance wheel 31 matching the number of the wading parts 121, and the pump cover 4 is provided with an opening 41 for passing the balance wheel 31.

[0103] In this embodiment, the pump cover 4 is mainly used in conjunction with the upper cover 6 and the valve seat 2 to position the diaphragm 1. The pump cover 4 is provided with an opening 41 for passing the balance wheel 31 of the transmission head 3. There is a clearance fit between the balance wheel 31 of the transmission head 3 and the opening 41 of the pump cover 4. Specifically, the clearance between the two can be between 0.8 mm and 1.5 mm.

[0104] The shape of the opening 41 can match the cross-section of the balance wheel 31. When the cross-section of the balance wheel 31 is elliptical, the opening 41 is an elliptical hole. The balance wheel 31 is projected along the output shaft direction of the motor 5, and the ratio of the area occupied by the projection of the balance wheel 31 in the output shaft direction of the motor 5 (the transmission area) to the cross-sectional area of ​​the pump head is between 42% and 60%. When the cross-sectional area of ​​the pump head is the same, the transmission area of ​​the balance wheel 31 provided in the present application is much higher than the transmission area of ​​the existing diaphragm pump. When the transmission area of ​​the balance wheel 31 is increased, it can push the wading part 121 with a larger area to participate in the reciprocating motion, which is beneficial to improve the utilization rate of the volume of the boosting chamber 20, and then improve the water flow rate and working efficiency of the diaphragm pump.

[0105] Taking actual data as an example, when the radius of the diaphragm pump is 76mm, the cross-sectional area of ​​the pump head is: 4534mm 2 The long semi-axis radius of the balance wheel 31 of the pump head structure of the present application is 15.15mm, the short radius is 12.25mm, and the total transmission area of ​​the balance wheel 31 is: 2150mm 2 The ratio of the transmission area of ​​the balance wheel 31 to the cross-sectional area of ​​the pump head is 47.42%, which is a significant improvement over the ratio of the transmission area to the cross-sectional area of ​​the pump head in the prior art.

[0106] Based on the pump head structure provided in the above embodiments, the present application also provides a diaphragm pump, which includes: the pump head structure described in any of the above embodiments, and a motor 5 that provides driving force for the transmission head 3.

[0107] Since the diaphragm pump provided in the present application is provided with the pump head structure described in the above embodiment, it can achieve the technical effects that can be achieved by the above pump head structure. The specific details will not be repeated here in the present application.

[0108] Specifically, a diaphragm pump having the pump head structure described in the above embodiment is provided, and the rotation speed of its motor 5 is between 1200RPM (revolutions per minute) and 1800RPM, the output torque is between 0.4NM (Newton-meters) and 0.8NM, and the flow rate of the diaphragm pump is between 4LPM (liters per minute) and 8LPM.

[0109] Any numerical value cited herein includes all values ​​of lower and upper values ​​that increase by one unit from the lower limit to the upper limit, and there is at least a two-unit interval between any lower value and any higher value. For example, if the value of the quantity of a component or a process variable (such as temperature, pressure, time, etc.) is stated to be from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in this specification. For values ​​less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be clearly expressed, and it can be considered that all possible combinations of numerical values ​​listed between the lowest value and the highest value are clearly stated in this specification in a similar manner.

[0110] Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. "About" or "approximately" used with a range applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the specified endpoints.

[0111] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." to describe a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to indicate that any attribute described that "may" include is optional.

[0112] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0113] The above-mentioned various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0114] The above are only several embodiments of the present invention. Although the embodiments disclosed by the present invention are as above, the above contents are only embodiments adopted for facilitating the understanding of the present invention and are not used to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modification and change in the form and details of the embodiments without departing from the spirit and scope disclosed by the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined by the attached claims.

Claims

1. A pump head structure, characterized in that: include: The transmission head, diaphragm and valve seat are arranged in sequence along the direction of the motor output shaft. The diaphragm has a first surface that cooperates with the transmission head and a second surface that cooperates with the valve seat; The second surface is provided with a plurality of wading parts capable of contacting with the fluid, a pressurizing cavity is formed between each of the wading parts and the valve seat, and the wading parts account for 50%-70% of the area of ​​the diaphragm; The diaphragm includes a sealing portion which is arranged between the edge of the diaphragm and the water-wading portion and matches the valve seat and has a size not less than a preset size; The first surface of the diaphragm abuts against the pump cover, the transmission head is provided with a balance wheel matching the number of the wading parts, and the pump cover is provided with an opening for penetrating the balance wheel.

2. The pump head structure according to claim 1, characterized in that: The second surface of the diaphragm is provided with reinforcing ribs on the sealing portion between two adjacent wading portions.

3. The pump head structure according to claim 1, characterized in that: The edge of the wading portion is an arc-shaped transition.

4. The pump head structure according to claim 3, characterized in that: The shape formed by the edge of the wading portion includes any one of the following: an ellipse, an irregular circular shape.

5. The pump head structure according to claim 1, characterized in that: The transmission head is provided with a balance wheel matching the number of the wading parts, and the area ratio of the balance wheel to the wading part is 70% to 90%, wherein the area ratio of the balance wheel to the water wading part is the projection area ratio of the balance wheel and the water wading part on the same reference plane along the direction of the motor output shaft.

6. The pump head structure according to claim 5, characterized in that: The cross section of the balance wheel is elliptical.

7. The pump head structure according to claim 1, characterized in that: The ratio of the minimum distance from the outermost cavity wall of the boosting cavity to the periphery of the pump head to the diameter of the pump head is 4% to 6%.

8. The pump head structure according to claim 1, characterized in that: The ratio of the minimum distance between the walls of two adjacent boosting chambers to the diameter of the pump head is 8% to 10%.

9. The pump head structure according to claim 1, characterized in that: The number of the boost chambers is 3, and the 3 boost chambers are evenly distributed around the motor output shaft.

10. The pump head structure according to claim 1, characterized in that: The cross-sectional shape of the boost chamber is elliptical or irregularly circular.

11. The pump head structure according to claim 1, characterized in that: The opening and the balance wheel are clearance-matched, and the clearance between the two is between 0.8 mm and 1.5 mm.

12. The pump head structure according to claim 1, characterized in that: The area occupied by the balance wheel is 42% to 60% of the cross-sectional area of ​​the entire pump head.

13. The pump head structure according to claim 1, characterized in that: The opening is an elliptical hole.

14. The pump head structure according to claim 1, characterized in that: The area ratio of the water-wading portion to the diaphragm is: the projection area ratio of the water-wading portion and the diaphragm on the same reference plane along the direction of the motor output shaft.

15. A diaphragm pump, characterized in that: include: A pump head structure as claimed in any one of claims 1 to 14, and a motor providing driving force for the transmission head.

16. The diaphragm pump according to claim 15, characterized in that The rotation speed of the motor is between 1200RPM and 1800RPM, the output torque is between 0.4NM and 0.8NM, and the flow rate of the diaphragm pump is between 4LPM and 8LPM.

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