CN209818259U - Diaphragm pump and pump head structure thereof - Google Patents

Abstract

The utility model discloses a diaphragm pump and pump head structure thereof, the pump head structure includes: the diaphragm is provided with a first surface matched with the transmission head and a second surface matched with the valve seat; the second surface is provided with a plurality of wading portions which can contact with fluid, a pressurizing cavity is formed between each wading portion and the valve seat, and the area ratio of the wading portions to the diaphragm is as follows: 50 to 70 percent. Diaphragm pump and pump head structure thereof can be under the circumstances of guaranteeing that the diaphragm pump volume is unchangeable, structural durability is good, improves the effluent water flow and the work efficiency isoparametric of diaphragm pump to satisfy the demand of user to diaphragm pump high performance, low cost, low noise, volume miniaturization etc..

Description

Diaphragm pump and pump head structure thereof

Technical Field

The utility model relates to a diaphragm pump technical field, in particular to diaphragm pump and pump head structure thereof.

Background

Diaphragm pumps are mechanical structures that achieve the transport or pressurization of a liquid through a diaphragm. The existing diaphragm pump can adopt a reciprocating driving piece to drive the diaphragm to deform so as to achieve the purpose of discharging and sucking liquid; or driven by a nutating disc or a swinging disc and other driving parts to drive the diaphragm to deform so as to achieve the aim of discharging and sucking liquid. The diaphragm pump has wide application in industries such as water purification and the like.

Diaphragm pumps, as supplied by current manufacturers, are to a large extent standardized in fixed models. The diaphragm pumps of different models correspond to parameters such as preset water outlet flow and fixed volume. Generally, the larger the outlet flow of the diaphragm pump, the larger the volume thereof.

However, in case of a certain inner space of the water purification system, it can be installed only with a diaphragm pump having a predetermined outlet flow rate. If a diaphragm pump with higher operating parameters such as outlet flow rate is installed in a limited space than the same type, further improvement of the existing diaphragm pump is needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a diaphragm pump and pump head structure thereof can improve the water flow and the work efficiency isoparametric of diaphragm pump under the circumstances that assurance diaphragm pump volume is unchangeable, structural durability is good to satisfy the demand of user to diaphragm pump high performance, low cost, low noise, volume miniaturization etc.

The above object of the present invention can be achieved by the following technical solutions:

a pump head structure, comprising: the diaphragm is provided with a first surface matched with the transmission head and a second surface matched with the valve seat; the second surface is provided with a plurality of wading portions which can contact with fluid, a pressurizing cavity is formed between each wading portion and the valve seat, and the area ratio of the wading portions to the diaphragm is as follows: 50 to 70 percent.

Further, the diaphragm comprises a sealing part which is arranged between the edge of the diaphragm and the water-involved part and is not lower than a preset size and matched with the valve seat.

Further, the second surface of the diaphragm is provided with a reinforcing rib on the sealing part between two adjacent water-involved parts.

Further, the edge of the water-involved part is in arc transition.

Further, the shape enclosed by the edge of the water-involved part comprises any one of the following: oval, irregular round-like.

Furthermore, the transmission head is provided with balance wheels which are matched with the number of the water-involved parts, and the area ratio of the balance wheels to the water-involved parts is 70-90%, wherein the area ratio of the balance wheels to the water-involved parts is the projection area ratio of the balance wheels and the water-involved parts on the same reference plane along the direction of the motor output shaft.

Further, the cross section of the balance wheel is oval.

Further, the ratio of the minimum distance from the cavity wall of the outermost side of the pressurizing cavity to the periphery of the pump head to the diameter of the pump head is 4-6%.

Further, the ratio of the minimum distance between the cavity walls of two adjacent pressurizing cavities to the diameter of the pump head is 8-10%.

Furthermore, the number of the pressurizing cavities is 3, and the 3 pressurizing cavities are uniformly distributed around the output shaft of the motor.

Further, the cross section of the pressurizing cavity is in an oval shape or an irregular round-like shape.

Furthermore, the first surface of the diaphragm abuts against a pump cover, the number of the balance wheels matched with the number of the water-involved parts is arranged on the transmission head, and an opening used for penetrating the balance wheels is formed in the pump cover.

Furthermore, the opening hole is in clearance fit with the balance wheel, and the clearance between the opening hole and the balance wheel is 0.8 mm-1.5 mm.

Further, the balance wheel occupies 42% to 60% of the cross-sectional area of the entire pump head.

Further, the opening is an elliptical hole.

Further, the area ratio of the water-related part to the diaphragm is: a projected area ratio of the water-involved section to the diaphragm on the same reference plane along the motor output shaft direction.

A diaphragm pump, comprising: a pump head arrangement as claimed in any preceding claim, and a motor for providing a driving force to the drive head.

Further, the rotating speed of the motor is as follows: the output torque is between 0.4N.M and 0.8N.M at 1200RPM to 1800RPM, and the flow rate of the diaphragm pump is as follows: 4LPM to 8 LPM.

The technical scheme provided by the embodiment of the application can be seen as follows: through optimizing the diaphragm in the pump head structure and rather than the structure of assorted transmission head and disk seat, improved the area of wading portion in the diaphragm that can influence diaphragm pump efficiency and accounted for the ratio, realized guaranteeing under the prerequisite such as diaphragm pump total volume, long-term reliability, security, the maximize has improved the volume utilization ratio of pump head structure department (especially has improved the area of pressure boost chamber and has accounted for the ratio, has improved the utilization ratio of volume in the pressure boost chamber) to improve the play water flow and the work efficiency of diaphragm pump.

The experimental data prove that: under the condition of the same motor rotating speed, the flow rate of the diaphragm pump adopting the pump head structure provided by the application is obviously larger than that of the diaphragm pump adopting the existing pump head structure under the same motor rotating speed; under the same flow, adopt the diaphragm pump of the pump head structure that this application provided to can make the motor speed effectively descend to can reduce the reciprocal fatigue wearing and tearing of diaphragm, and then improve the life-span of diaphragm pump and reduce the noise of diaphragm pump.

Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the present application include many variations, modifications, and equivalents.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

FIG. 1 is a schematic diagram of a pump head configuration according to one embodiment of the present application;

FIG. 2 is an exploded view of a pump head configuration according to one embodiment of the present application;

FIG. 3 is a schematic diagram of the construction of the diaphragm of the pump head construction according to one embodiment of the present application;

FIG. 4 is a front view of a diaphragm of a pump head construction according to one embodiment of the present application;

FIG. 5 is a top view of a septum in a pump head configuration according to one embodiment of the present application;

FIG. 6 is a rear view of a septum in a pump head configuration according to one embodiment of the present application;

FIG. 7 is a schematic view of a center valve seat of a pump head configuration according to an embodiment of the present application;

FIG. 8 is a front view of a center valve seat of a pump head construction according to one embodiment of the present application;

FIG. 9 is a rear view of a valve seat in a pump head construction according to one embodiment of the present application;

FIG. 10 is a schematic diagram of a center drive head of a pump head configuration according to an embodiment of the present application;

FIG. 11 is a top plan view of a middle drive head of a pump head construction according to one embodiment of the present application;

FIG. 12 is a schematic diagram of a pump head configuration according to an embodiment of the present application;

FIG. 13 is a top view of a center pump cap of a pump head construction according to one embodiment of the present application;

fig. 14 is a schematic overall structure diagram of a diaphragm pump provided in an embodiment of the present application;

fig. 15 is a schematic diagram illustrating a comparison between the water outlet pressure and the water outlet flow rate of the diaphragm pump provided in the embodiment of the present application and a conventional diaphragm pump at the same rotation speed and the same eccentric wheel.

Description of reference numerals:

1. a diaphragm; 11. a first surface; 111. a fitting portion; 12. a second surface; 121. a water-involved part; 122. a sealing part; 123. reinforcing ribs; 2. a valve seat; 21. a water inlet part; 22. a water outlet part; 20. a pressurizing cavity; 3. a drive head; 31. a balance wheel; 4. a pump cover; 41. opening a hole; 5. a motor; 6. an upper cover; 7. an eccentric wheel; 8. and a bearing.

Detailed Description

The technical solution of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, it should be understood that these embodiments are only used for illustrating the present invention and are not used for limiting the scope of the present invention, and after reading the present invention, the modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the claims attached to the present application.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In order to satisfy the user to the demand of diaphragm pump high performance, low cost, low noise, volume miniaturization etc, this application is guaranteeing that the diaphragm pump volume is unchangeable, under the good prerequisite of structural durability, improves diaphragm pump inner structure to improve the working parameter of diaphragm pump, improved water flow and work efficiency greatly.

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

Referring to fig. 1 to 14, the diaphragm pump operates according to the following principle: when the output shaft of the motor 5 rotates, the inclined eccentric wheel 7 can be driven to rotate; a bearing 8 is arranged between the inclined eccentric wheel 7 and the transmission head 3, and 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 rotating due to the existence of a preset eccentric angle; the wading portion 121 of the diaphragm 1 is also simultaneously pushed upward or pulled downward in sequence to generate repeated upward and downward displacements. Specifically, when the balance wheel 31 of the transmission head 3 moves downward, the wading portion 121 of the diaphragm 1 and the piston push block (not shown in the figure) are synchronously pulled downward, so that the piston sheet of the valve seat 2 is pushed away, and tap water can enter the pressurizing cavity 20 through the water inlet hole on the valve seat 2; when the balance wheel 31 of the transmission head 3 moves upwards, the wading part 121 of the diaphragm 1 and the piston are pushed upwards synchronously, and water in the pressurizing cavity 20 is squeezed, so that the water pressure is increased to a preset pressure range; the pressurized high-pressure water can push the non-return rubber pad on the water outlet part 22 on the valve seat 2 away, and the high-pressure water enters the high-pressure water chamber through the water outlet hole of the water outlet part 22.

Referring to fig. 3 to 6, the pump head structure includes: the transmission head 3, the diaphragm 1 and the valve seat 2 are arranged in sequence along the direction of an output shaft of the motor 5. The diaphragm 1 has a first surface 11 cooperating with the drive head 3 and a second surface 12 cooperating with the valve seat 2. The second surface 12 is provided with a plurality of wading portions 121 which can be in contact with the fluid. A pressurized cavity 20 is formed between each of the water-involved portions 121 and the valve seat 2. The area ratio of the water-containing section 121 to the diaphragm 1 is: 50 to 70 percent.

In this embodiment the diaphragm 1 has a first surface 11 that can cooperate with the drive head 3 of the diaphragm pump and a second surface 12 that can cooperate with the valve seat 2 of the diaphragm pump. Wherein, a plurality of wading parts 121 capable of contacting with the fluid are arranged on the second surface 12. The fluid is different mainly according to the application scenario of the diaphragm pump, and the application is not limited in detail herein. For example, when the diaphragm pump is used in a water purification system, the fluid may be water. The first surface 11 is provided with a fitting portion 111 for fitting positioning with the drive head 3. The driving force of the transmission head 3 received at the fitting portion 111 is transmitted to the corresponding component in the valve seat 2 through the water-involved portion 121, so that the corresponding component in the valve seat 2 can be synchronously driven by the transmission head 3.

Referring to fig. 7 to 9, in the present embodiment, a pressurizing cavity 20 can be formed between each of the water-related portions 121 and the valve seat 2. Specifically, the valve seat 2 may be provided with a plurality of water inlet portions 21 equal in number to the water-related portions 121, and a water outlet portion 22 capable of being communicated with the water inlet portions 21. Wherein the water inlet portion 21 and the water-involved portion 121 can cooperate to form the pressurizing cavity 20.

Specifically, the number of the pressure increasing cavities 20 may be 3, and 3 pressure increasing cavities 20 are uniformly distributed around the output shaft of the motor 5. The number of the pressurizing cavities 20 is preferably 3, and on one hand, the smaller the number of the pressurizing cavities 20 is, the more the area ratio of the pressurizing cavities 20 to the pump head is favorably improved; on the other hand, the smaller the number of booster cavities 20, the smaller the number of mutually independent booster cavities 20 stacked, and the smaller the total failure probability, provided that the failure probabilities of the respective booster cavities 20 are equal. The pressurizing cavity 20 is a core structure of the pump head structure, and the smaller the failure probability of the pressurizing cavity 20 is, the better the reliability of the pump head structure is ensured. The area ratio of the pressurizing cavity 20 to the pump head is specifically as follows: the projection area ratio of the pressurizing chamber 20 and the pump head on the same reference plane along the direction of the output shaft of the motor 5. Of course, the number of the pressurizing cavities 20 can also be 4 or more, and a plurality of the pressurizing cavities 20 can be uniformly distributed around the output shaft, and in particular, the application will not be discussed herein.

Wherein, because certain deformation need take place when diaphragm 1 and transmission head 3 direct contact, consequently, the material of diaphragm 1 can be for having materials such as elastic plastics, rubber in order to satisfy its deformation demand. Each water-engaging portion 121 has a relatively closed outer contour. When sharp corners appear on the diaphragm 1, the diaphragm 1 made of the elastic material is easy to fail at the sharp corners. In order to ensure the reliability of the diaphragm 1 in use and avoid the damage of the diaphragm 1 at a sharp corner, the edge of the outer contour of the wading part 121 is in arc transition.

Specifically, the shape enclosed by the edge of the water-containing portion 121 includes any one of the following: oval, irregular round-like. Of course, the shape enclosed by the edge of the wading portion 121, that is, the outer contour of the wading portion 121 may also be in other arc transition shapes, such as a sector of an arc transition, and the like.

In the present application, the area ratio of the water-containing portion 121 to the diaphragm 1 is: 50% -70%. It should be noted that: since the water-containing unit 121 and the diaphragm 1 are spatially three-dimensional, the area ratio of the water-containing unit 121 to the diaphragm 1 may be specifically: a projected area ratio of the water-receiving section 121 to the diaphragm 1 on the same reference plane along the direction of the output shaft of the motor 5.

The area ratio of the wading portion 121 to the diaphragm 1 as a whole is larger than the area ratio of the wading portion 121 having a circular outer contour to the diaphragm 1 in the related art. When the area ratio of the water-involved part 121 to the diaphragm 1 is less than 50%, the flow rate characteristic of the diaphragm pump is low; when the water-involved part 121 occupies more than 70% of the area of the diaphragm 1, the reliability (including life, strength, sealing, etc.) of the diaphragm pump may be degraded.

In the embodiment of application, through the diaphragm 1 in the pump head structure and with its assorted transmission head 3 and disk seat 2's structure optimize, improved the area proportion of portion 121 of wading in the diaphragm 1 that can influence diaphragm pump efficiency, realized guaranteeing under the prerequisite such as diaphragm pump total volume, long-term reliability, security, the maximize has improved the volume utilization ratio of pump head structure department to improve the play water flow and the work efficiency of diaphragm pump.

The area ratio of the water-receiving portion 121 to the diaphragm 1 is preferably selected on the premise of ensuring the overall structural strength and sealing performance. Referring to fig. 3 to 6, the diaphragm 1 includes a sealing portion 122 not smaller than a predetermined size, which is disposed between the edge of the diaphragm 1 and the water-related portion 121 and is engaged with the valve seat 2.

Specifically, when the wading portion 121 of the diaphragm 1 is fitted to the valve seat 2, the wading portion 121 of the diaphragm 1, other than the wading portion 121 for forming the pressurizing chamber 20, is mainly used for forming the sealing portion 122. Further, 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 rib 123 on the sealing portion 122 between two adjacent water-related portions 121.

Due to the eccentric angle θ of the eccentric wheel 7, the projected area of the pressurizing cavity 20 and the water-involved part 121 along the output shaft direction of the motor 5 has the following relationship: the projected area S1 of the pressurizing chamber 20 in the direction along the output shaft of the motor 5 is equal to the projected area S2 × cos θ of the wading portion 121 in the direction along the output shaft of the motor 5. That is, the projected area of the pressurizing chamber 20 in the direction of the output shaft of the motor 5 corresponds to the projected area of the wading section 121 in the direction of the output shaft of the motor 5. The larger the projected area of the water-receiving portion 121 in the direction of the output shaft of the motor 5, the larger the projected area of the pressure increasing chamber 20 in the direction of the output shaft of the motor 5. When the area ratio of the wading portion 121 to the diaphragm 1 is increased, the area ratio of the pressurizing chamber 20 is increased. After the area ratio of the pressurizing cavity 20 is increased, the volume of water pumped into the pressurizing cavity 20 by a single pump can be increased, and the unit flow and the working efficiency of the diaphragm pump can be increased.

In some embodiments of the present disclosure, the cross-sectional shape of the pressurizing cavity 20 is an ellipse or an irregular round-like shape in order to increase the area ratio of the pressurizing cavity 20 as much as possible without changing the size of the pump head. Wherein the area ratio of the pressurizing cavity 20 can be determined by projecting the pressurizing cavity 20 and the pump head on the same reference plane along the direction of the output shaft of the motor 5. As shown in fig. 1, the main body portion of the pressurizing chamber 20 may be formed by the water inlet portion 21 of the valve body. Accordingly, the water inlet portion 21 is formed with an oval or irregular circular-like hole.

In the following embodiments, the cross-sectional shape of the pressurizing cavity 20 is mainly described as an oval, and the pressurizing cavity 20 having other shapes may be referred to the oval pressurizing cavity 20, and the description of the present application is omitted.

In one embodiment, the ratio of the minimum distance from the outermost chamber wall of the pumping chamber 20 to the pump head periphery to the pump head diameter is 4% to 6%. The ratio of the minimum distance between the cavity walls of the two adjacent pressurizing cavities 20 to the diameter of the pump head is 8-10%.

Wherein, the first surface 11 of the diaphragm 1 is also provided with a pump cover 4 which is matched 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 in sealing engagement with the valve seat 2. In order to ensure the sealing performance, the structural strength and the gap installation requirement of the transmission head 3, the cavity wall at the outermost side of the pressurizing cavity 20 (the position where the cavity wall of the pressurizing cavity 20 is closest to the periphery of the pump head) needs to meet a preset minimum distance to the periphery of the pump head (the periphery corresponding to the diameter of the pump head). In particular, the minimum distance may be matched to the type of diaphragm pump. Generally, the larger the pump head diameter of a diaphragm pump, the larger the minimum distance is accordingly.

For example, for a diaphragm pump with a pump head diameter of 76mm (millimeters), the minimum distance from the outermost chamber wall of the pumping chamber 20 to the pump head perimeter is about 3.37 millimeters. Wherein, the ratio of the minimum distance (3.37mm) from the outermost chamber wall of the pressurizing chamber 20 to the periphery of the pump head to the diameter (76mm) of the pump head is 4.43%. This minimum distance is primarily a consideration of the sealing requirements of the pump head at the diaphragm 1 and the assembly gap requirements between the drive head 3 and the pump cover 4. The oscillating wheel of the transmission head 3 axially reciprocates along the direction of the output shaft in the use process, and in order to ensure that the transmission head 3 does not interfere with the pump cover 4 in the use process, the interval between the transmission head 3 and the pump cover 4 is at least 0.95 mm.

In order to ensure the requirements of tightness and strength, a predetermined minimum distance needs to be satisfied between the cavity walls of two adjacent pressurizing cavities 20. In particular, the minimum distance may be matched to the type of diaphragm pump. Generally, the larger the pump head diameter of a diaphragm pump, the larger the minimum distance is accordingly. For example, for a diaphragm pump with a pump head diameter of 76mm (mm), the minimum distance is about 6.5mm, and the ratio of the minimum distance between the chamber walls of two adjacent pumping chambers 20 (6.5mm) to the pump head diameter (76mm) is 8.55%.

The applicant found that: when the ratio of the minimum distance between the cavity wall of the outermost side of the pressurizing cavity 20 and the periphery of the pump head to the diameter of the pump head is 4% -6%, and the ratio of the minimum distance between the cavity walls of two adjacent pressurizing cavities 20 to the diameter of the pump head is 8% -10%, the projection area of the pressurizing cavity 20 in the direction of the output shaft of the motor 5 can be maximally enlarged on the premise of ensuring the integral strength and the sealing performance of the structure. I.e., the area fraction of the pumping cavity 20 is increased. After the area ratio of the pressurizing cavity 20 is increased, the volume of the pressurizing cavity 20 can be increased, and the unit flow and the working efficiency of the pressurizing pump can be improved.

Hereinafter, the area ratio of the elliptical shape surrounded by the edge of the water-receiving section 121 to the diaphragm 1 (hereinafter, abbreviated as elliptical area ratio in the calculation) is compared with the area ratio of the conventional circular water-receiving section 121 to the diaphragm 1 (hereinafter, abbreviated as circular area ratio in the calculation).

A: the radius of a long half shaft at the contact part (water-involved part) of the pump cover and the diaphragm is 14.75 mm;

b: the radius of a short half shaft at the contact part (water-involved part) of the pump cover and the diaphragm is 17 mm;

t: the number of the pressurizing cavities is 3;

r: the radius of the contact part (water-involved part) of the pump cover and the diaphragm is 13.25 mm;

t: the number of the pressurizing cavities is 3;

the comparison between the elliptical area ratio and the existing circular area ratio shows that: the oval area ratio that this application provided is far greater than current circular area ratio, after having improved the area ratio of the shared diaphragm 1 of portion 121 that wades, has improved the area ratio of pressure boost chamber 20 in other words. After the area ratio of the pressurizing cavity 20 is increased, the volume of the pressurizing cavity 20 is increased, and the unit flow and the working efficiency of the pressurizing pump are further improved. That is to say, the pump head structure that this application provided can be favorable to improving the unit flow of diaphragm pump under the unchangeable prerequisite of diaphragm pump volume, and then improves the work efficiency of diaphragm pump.

When the area percentage of diaphragm pump is in reasonable within range, can guarantee that the diaphragm pump is unchangeable at the bulk volume, under the long-term reliable safe operation's the prerequisite, the volume in the maximize utilization pump head structure improves the volume in pressure boost chamber 20 to improve the work efficiency of diaphragm pump. In the present embodiment, the area ratio of the pressurizing chamber 20 may be between 70% and 90%. When the area ratio of the pressurizing cavity 20 is too small, for example, the area ratio of the pressurizing cavity 20 of the existing diaphragm pump is usually less than 60%, at this time, the flow characteristic corresponding to the pressurizing pump is poor; and when the area ratio of the pressurizing chamber 20 is more than 90%, the sealing type and the structural reliability of the diaphragm pump may be affected.

Referring to fig. 10 to 11, the area of the water-containing portion 121 of the diaphragm 1 and the area of the balance 31 of the driving head 3 also have a matching relationship. Under the premise that the outer contour areas of the diaphragm 1 and the transmission head 3 are not changed, when the area of the wading part 121 of the diaphragm 1 is increased, the area of the balance 31 of the transmission head 3 is correspondingly increased, and when the two are matched, the effective area of the balance 31 of the transmission head 3 acting on the wading part 121 of the diaphragm 1 is larger, so that the utilization rate of the volume of the pressurizing cavity 20 is improved, and the unit flow rate and the working efficiency of the diaphragm pump are further improved.

In one embodiment, the number of the wobblers 31 corresponding to the number of the water-receiving portions 121 is provided in the drive head 3, and the area ratio of the wobblers 31 to the area ratio of the water-receiving portions 121 is 70% to 90%. The area ratio of the balance 31 to the paddle 121 is a projected area ratio of the balance 31 and the paddle 121 on the same reference plane along the output shaft direction of the motor 5.

In a specific embodiment, the balance wheel 31 is an oval cross-section, which exemplifies how the unit flow rate and the operation efficiency of the diaphragm pump are improved compared to the conventional diaphragm pump.

The unit flow of the existing diaphragm pump is as follows:

the meanings of each letter are shown in the above figure:

wherein psi is the angle of the eccentric wheel, and the angle is 3.5 degrees;

R₁taking 20.5 mm; r₂Taking 11.75 mm; r₃Taking 15 mm;

the unit flow of the diaphragm pump that this application provided:

the new letter has the following meanings:

a: the radius of the long half shaft of the transmission head is 15.15 mm; b: the radius of the short half shaft of the transmission head is 12.25 mm;

a: the radius of the long half shaft of the pump cover is 14.75 mm; b: the radius of the minor half shaft of the pump cover is 17 mm;

on the whole, the work efficiency of the diaphragm pump provided by the application can be improved by about 38.9% compared with the existing diaphragm pump.

Fig. 15 is a schematic diagram showing a comparison between the water outlet pressure and the water outlet flow rate of the diaphragm pump provided in the embodiment of the present invention and a conventional diaphragm pump at the same rotation speed and the same eccentric wheel 7. Under the prerequisite of same motor 5 rotational speed and same eccentric wheel 7, the diaphragm pump that this application provided compares traditional diaphragm pump work efficiency and has had showing the promotion.

In addition, please refer to table 1, which shows a comparison table of test data between the diaphragm pump having the pump head structure provided in the present application and the conventional diaphragm pump in table 1. The variables in the test process are only "different motor speeds", all else being the same.

TABLE 1

It is also apparent from table 1 that for a 1000G (gallon) diaphragm pump, the diaphragm pump using the pump head structure provided in the present application has a significantly greater flow rate at the same motor 5 speed than a diaphragm pump using a conventional pump head structure. Under the same flow, adopt the diaphragm pump of the pump head structure that this application provided to can make 5 rotational speeds of motor effectively descend to can reduce the reciprocal fatigue wearing and tearing of diaphragm 1, and then improve the life-span of diaphragm pump and reduce the noise of diaphragm pump.

Referring to fig. 12 and 13, in an embodiment, the first surface 11 of the diaphragm 1 abuts against the pump cover 4, the number of the balance wheels 31 matching the number of the water-related portions 121 is provided on the transmission head 3, and the pump cover 4 is provided with an opening 41 for passing through the balance wheels 31.

In the present embodiment, the pump cover 4 is mainly used to position the diaphragm 1 in cooperation with the upper cover 6 and the valve seat 2. The pump cover 4 is provided with an opening 41 for inserting the balance 31 of the drive head 3. The balance wheel 31 of the transmission head 3 is in clearance fit with the opening 41 of the pump cover 4. Specifically, the fit clearance between the two may be 0.8mm to 1.5 mm.

The shape of the opening 41 may match the cross-section of the balance 31. When the cross section of balance 31 is oval, opening 41 is an oval hole. The balance 31 is projected along the output shaft direction of the motor 5, and the ratio of the area (transmission area) occupied by the balance 31 projected in the output shaft direction of the motor 5 to the cross-sectional area of the pump head is 42-60%. The driving area of the balance wheel 31 provided by the application is much higher than that of the existing diaphragm pump under the condition that the cross-sectional area of the pump heads is the same. After the transmission area of the balance wheel 31 is increased, the wading part 121 with more area can be pushed to participate in reciprocating motion, so that the utilization rate of the volume of the pressurizing cavity 20 is improved, and the water outlet flow and the working efficiency of the diaphragm pump are further improved.

Taking practical data as an example, when the radius of the diaphragm pump is 76mm, the cross-sectional area of the pump head is: 4534mm². The radius of the major axis of the balance wheel 31 adopting the pump head structure of the present application is 15.15mm, the radius of the minor axis is 12.25mm, and the sum of the transmission areas of the balance wheel 31 is: 2150mm². The ratio of the transmission area of the balance wheel 31 to the cross-sectional area of the pump head is: 47.42%, has a larger lift compared with the ratio of the transmission area to the cross-sectional area of the pump head in the prior art.

Based on the pump head structure that provides in the above-mentioned embodiment, the present application still provides a diaphragm pump, and this diaphragm pump includes: a pump head structure as described in any of the above embodiments, and a motor 5 for providing a driving force to the driving head 3.

The diaphragm pump that this application provided is owing to set up the pump head structure in above-mentioned embodiment, consequently can reach the technological effect that above-mentioned pump head structure can realize, and is specific, and this application is no longer repeated here.

Specifically, in the diaphragm pump provided with the pump head structure described in the above embodiment, the rotation speed of the motor 5 is: the output torque is between 0.4N.M (Newton-meter) and 0.8N.M at 1200RPM (revolutions per minute) and 1800RPM, and the flow rate of the diaphragm pump is as follows: between 4LPM (liters per minute) and 8 LPM.

Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.

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

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.

A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

The above embodiments in the present specification are all described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment is described with emphasis on being different from other embodiments.

The above description is only a few embodiments of the present invention, and although the embodiments of the present invention are disclosed as above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (18)

1. A pump head structure, comprising: a transmission head, a diaphragm and a valve seat which are arranged in sequence along the direction of the output shaft of the motor,

the diaphragm is provided with a first surface matched with the transmission head and a second surface matched with the valve seat;

the second surface is provided with a plurality of wading portions which can contact with fluid, a pressurizing cavity is formed between each wading portion and the valve seat, and the area ratio of the wading portions to the diaphragm is as follows: 50 to 70 percent.

2. A pump head construction as claimed in claim 1, wherein the diaphragm includes a seal not less than a predetermined size disposed between an edge of the diaphragm and the water-engaging portion to cooperate with the valve seat.

3. A pump head construction according to claim 2, wherein the second surface of the diaphragm is provided with a rib on the seal between two adjacent said water-engaging portions.

4. A pump head construction as claimed in claim 1, wherein the edge of the water-engaging portion is an arcuate transition.

5. A pump head structure as claimed in claim 4, wherein the shape defined by the rim of the water-engaging portion comprises any one of: oval, irregular round-like.

6. A pump head structure according to claim 1, wherein the number of wobblers corresponding to the number of the water-receiving portions is provided on the drive head, and an area ratio of the wobblers to the water-receiving portions is 70% to 90%, and wherein an area ratio of the wobblers to the water-receiving portions is a projected area ratio of the wobblers and the water-receiving portions on the same reference plane along the direction of the motor output shaft.

7. A pump head construction according to claim 6, wherein the balance wheel is oval in cross-section.

8. A pump head structure as claimed in claim 1, wherein the ratio of the minimum distance from the outermost chamber wall of the pumping chamber to the pump head periphery to the diameter of the pump head is in the range 4% to 6%.

9. A pump head structure as claimed in claim 1, wherein the ratio of the minimum distance between the walls of two adjacent pumping chambers to the diameter of the pump head is in the range 8% to 10%.

10. A pump head structure as claimed in claim 1, wherein the number of said pumping chambers is 3, and 3 of said pumping chambers are evenly distributed around said motor output shaft.

11. A pump head construction as claimed in claim 1, wherein the cross-sectional shape of the pumping chamber is elliptical or irregular round-like.

12. A pump head structure as claimed in claim 1, wherein the first surface of the diaphragm abuts against a pump cover, the drive head is provided with a number of wobblers matching the number of the paddle portions, and the pump cover is provided with an opening through which the wobblers are inserted.

13. A pump head structure as claimed in claim 12, wherein the aperture is in clearance fit with the balance, the clearance being between 0.8mm and 1.5 mm.

14. A pump head structure as claimed in claim 12, wherein the wobbler occupies an area that is 42% to 60% of the cross-sectional area of the entire pump head.

15. A pump head construction as claimed in claim 12, wherein the aperture is an elliptical aperture.

16. A pump head structure as claimed in claim 1, wherein the area ratio of the water-engaging portion to the diaphragm is: a projected area ratio of the water-involved section to the diaphragm on the same reference plane along the motor output shaft direction.

17. A diaphragm pump, comprising: a pump head structure as claimed in any one of claims 1 to 16, and a motor for providing a driving force to the drive head.

18. The diaphragm pump of claim 17 wherein said motor rotates at a speed of: the output torque is between 0.4N.M and 0.8N.M at 1200RPM to 1800RPM, and the flow rate of the diaphragm pump is as follows: 4LPM to 8 LPM.