Diaphragm pump

Abstract

The invention provides a diaphragm pump which comprises a pump core, the pump core comprises a shell, a diaphragm located in the shell and a diaphragm core located in the diaphragm, a liquid conveying cavity is defined by the diaphragm and the shell, an air pressure cavity is defined by the diaphragm and the diaphragm core, and a liquid outlet and a liquid passing groove are further formed in the inner wall, where the liquid conveying cavity is defined, of the shell. The liquid outlet is communicated with the liquid conveying cavity and the exterior of the diaphragm pump, and the liquid passing groove is communicated with the liquid outlet. According to the diaphragm pump, the liquid conveying continuity can be improved, the usage amount of compressed air is reduced, and the diaphragm pump has good liquid pumping performance.

Description

Technical Field

[0001] The present invention relates to the field of pumps, and more particularly to the field of diaphragm pumps. Background Art

[0002] A diaphragm pump is a device that changes the path of the transported fluid by means of a diaphragm. According to different driving forces, it is divided into three types: pneumatic, electric, and hydraulic. Usually, a pneumatic diaphragm pump uses compressed air to drive the diaphragm to reciprocate, sucking in and pumping out the liquid. Additionally, there are also diaphragm pumps that use a gas source to drive the expansion and contraction of the diaphragm, enabling the diaphragm to suck in and discharge the liquid, achieving quantitative pumping of the liquid. Such diaphragm pumps are usually made into a slender structure, with a float switch indicating the liquid level of the solution being pumped. They adopt a liquid flow-through structure of the diaphragm - housing, transporting the liquid to the pump outlet.

[0003] In the reciprocating motion of the diaphragm pump, the liquid is mainly pumped through the back-and-forth stretching motion of the diaphragm. Therefore, the diaphragm - housing flow channel structure requires precise control of the dimensions of the diaphragm, liquid chamber, and housing. The diaphragm is easily worn or damaged, reducing the life and reliability of the pump. The slender structure of the pump has insufficient fluid flow smoothness inside the pump and high air consumption. Moreover, for a simple diaphragm - housing flow channel structure, slight changes in the diaphragm material easily cause the diaphragm to adhere to the inner wall, resulting in discontinuous liquid transportation, thereby reducing the pumping efficiency of the pump. Additionally, the large depth of the cavity in the slender structure also increases the processing difficulty. Summary of the Invention

[0004] An object of the present invention is to provide a diaphragm pump with better liquid pumping performance.

[0005] The diaphragm pump for achieving the above object includes a pump core, the pump core includes a housing, a diaphragm located inside the housing, and a diaphragm core located inside the diaphragm. The diaphragm and the housing define a liquid delivery chamber, and the diaphragm and the diaphragm core define a pneumatic chamber. An outlet and a liquid - through groove are further provided on the inner wall of the housing that defines the liquid delivery chamber. The outlet communicates the liquid delivery chamber with the outside of the diaphragm pump, and the liquid - through groove is communicated with the outlet.

[0006] In one or more embodiments, the liquid - through groove includes a criss - cross network groove path.

[0007] In one or more embodiments, the liquid - through groove includes at least one annular groove located at the bottom and / or middle and / or top of the liquid delivery chamber.

[0008] In one or more embodiments, the liquid - through groove further includes a longitudinal groove.

[0009] In one or more embodiments, the ratio of the groove depth to the groove width of the liquid - through groove is 1:15 to 2:1.

[0010] In one or more embodiments, the depth of the liquid passage groove ranges from 0.2 to 2 mm.

[0011] In one or more embodiments, the width of the liquid passage groove is 1 to 3 mm.

[0012] In one or more embodiments, the diaphragm is an elastic member and has a hollow elongated cup shape, and the diaphragm core is located inside the diaphragm and is adapted to the shape of the diaphragm.

[0013] In one or more embodiments, the aspect ratio of the housing ranges from 2:1 to 2.5:1.

[0014] In one or more embodiments, the diaphragm pump further includes a liquid outlet pipe provided on the pump head and a liquid outlet channel provided on the housing, and the liquid outlet is communicated with the liquid outlet pipe through the liquid outlet channel.

[0015] In one or more embodiments, the diaphragm core includes an air passage, and the opening of the air passage is arranged lower than the liquid outlet.

[0016] In one or more embodiments, the diaphragm pump further includes a liquid outlet valve connected to the liquid outlet and a liquid inlet valve communicated with the liquid delivery chamber, and the liquid outlet valve and the liquid inlet valve are one-way valves.

[0017] By providing a liquid passage groove communicated with the liquid outlet on the inner wall of the housing, in the process of the diaphragm repeatedly contracting and expanding, the liquid can exist in the liquid delivery chamber and the liquid passage groove at the same time. With the help of the liquid passage groove, the fluid flow in the liquid delivery chamber can be promoted and the liquid can be guided to the liquid outlet, avoiding problems such as liquid accumulation in the liquid delivery chamber or blockage of the inner liquid outlet caused by the diaphragm adhering to the housing or due to the elongated structure, etc. Thus, the dependence on the accuracy and material properties of the diaphragm elastomer is reduced, the continuity of liquid delivery is ensured, the usage amount of compressed air is reduced, and the liquid pumping performance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other features, properties and advantages of the present invention will become more obvious through the following description in conjunction with the drawings and embodiments, wherein:

[0019] Figure 1 is a schematic diagram of the overall structure of the diaphragm pump;

[0020] Figure 2 is a partial structural sectional view of the pump core and the pump head;

[0021] Figure 3A is a schematic diagram when the air circuit is in the exhaust state;

[0022] Figure 3B is a schematic diagram when the air circuit is in the initial air intake state;

[0023] Figure 4 is a cross-sectional view of the lower shell;

[0024] Figure 5 It is an external schematic diagram of the pump core and pump head;

[0025] Figure 6 yes Figure 2 A partial enlarged view of the middle A;

[0026] Figure 7 This is an oblique view of the pump core and pump head;

[0027] Figure 8 This is a top view of the pump core and pump head;

[0028] Figure 9 yes Figure 7 A partial enlarged view of point B in the middle.

[0029] Description of Reference Numerals

[0030] 10 Pump element

[0031] 11 Housing

[0032] 12 Diaphragm

[0033] 13 Diaphragm core

[0034] 14 Liquid delivery chamber

[0035] 15 Air pressure chamber

[0036] 16 liquid outlet

[0037] 17 Liquid inlet

[0038] 18 Liquid outlet valve

[0039] 19 Liquid outlet channel

[0040] 20 Pump head

[0041] 21 Liquid outlet pipe

[0042] 30 Pump casing

[0043] 31 Liquid inlet valve

[0044] 32 Inlet valve

[0045] 33 Air Inlet

[0046] 34 Airway

[0047] 40 Float switch

[0048] 50-way liquid tank

[0049] 51 Ring groove

[0050] 52 longitudinal groove

[0051] 100 liquid to be transported Specific implementation manners

[0052] The present invention will be further described below in conjunction with specific embodiments and the accompanying drawings. More details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention is obviously capable of being implemented in many other ways different from this description. Those skilled in the art can make similar generalizations and deductions according to the actual application situation without departing from the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0053] It should be noted that these and subsequent other drawings are only examples, and they are not drawn under the condition of equal proportion, and should not be used to limit the actual required protection scope of the present invention.

[0054] As Figure 1 shown, the diaphragm pump includes a pump housing 30, a pump core 10, a float switch 40, and a pump head 20. The pump housing 30 and the pump head 20 are detachably connected through a structure such as a threaded connection. The pump housing 30 stores the liquid 100 to be transported. The float switch 40 is installed in the pump housing 30 and is used to measure the liquid level of the liquid 100 to be transported. The pump core 10 is located in the pump housing 30 and is used to pump the liquid 100 to be transported. The liquid 100 to be transported can be a cleaning liquid, a calibration liquid, a medicinal liquid, or an edible liquid. Thus, the diaphragm pump can be applied to application scenarios such as an automated cleaning and calibration system, a medicinal liquid transportation system, and a food and beverage liquid transportation system.

[0055] The central axes of the pump core 10 and the pump head 20 are preferably arranged in an eccentric structure.

[0056] Continue to refer to Figure 2 shown, the pump core 10 includes a housing 11, a diaphragm 12 located inside the housing 11, and a diaphragm core 13 located inside the diaphragm 12. The diaphragm 12 and the housing 11 define a liquid transportation chamber 14. The diaphragm 12 is an elastic member and is in the shape of a hollow elongated cup. The diaphragm core 13 is located inside the diaphragm 12 and generally adapts to the outer shape of the diaphragm 12. The diaphragm 12 is located between the housing 11 and the diaphragm core 13, forming two chambers: a pneumatic chamber 15 and a liquid transportation chamber 14.

[0057] The liquid transportation chamber 14 is part of the liquid path and is used to hold the liquid 100 to be transported. The liquid path further includes a liquid outlet 16 and a liquid inlet 17. The liquid outlet 16 is arranged on the upper side of the inner wall of the housing 11 and is connected to a liquid outlet valve 18. The liquid inlet 17 is arranged at the bottom of the housing 11 and cooperates with a liquid inlet valve 31. Both the liquid inlet valve 31 and the liquid outlet valve 18 are one-way valves. In this way, the one-way pumping of the liquid from bottom to top is realized.

[0058] Further, as Figure 2 and Figure 7 shown, the diaphragm pump further includes a liquid outlet pipe 21 provided on the pump head 20 and a liquid outlet passage 19 provided on the housing 11. The liquid outlet 15 is communicated with the liquid outlet pipe 160 through the liquid outlet passage 19 to lead out the liquid 100 to be transported.

[0059] Continue to refer to Figures 2 to 4 shown. The air pressure chamber 15 is a part of the air path. Another part of the air path is shown in Figures 3A - 3B shown, including an intake valve 32, an air inlet 33 and an air passage 34. The air inlet 33 is communicated with compressed gas, and the compressed gas serves as a driving source. The intake valve 32 and the air inlet 33 are provided on the pump head 20, and the end of the air passage 34 is located on the outer peripheral surface of the diaphragm core 13.

[0060] In Figures 3A - 3B the embodiment shown, the intake valve 32 is a two-position three-way valve.

[0061] In Figure 3A the air path exhaust stage shown, the gas in the air pressure chamber 15 is naturally discharged to the atmosphere outside the pump through the air passage 34, the inlet 3 and the outlet 2 of the intake valve 32 under the drive of the pressure in the chamber. At the same time, the interface 1 of the intake valve 32 prevents the compressed gas in the air inlet 33 from entering the air path. The volume of the air pressure chamber 15 gradually decreases until it adheres to the diaphragm core 13, and the liquid delivery chamber 14 increases. At this time, the liquid enters the liquid delivery chamber 14 through the liquid inlet valve 31 and the liquid inlet 17.

[0062] In Figure 3B the initial air intake stage of the air path shown, the intake valve 32 changes position, and the air inlet 33 sends the compressed gas into the air pressure chamber 15 through the intake valve 32 and the air passage 34, so that the air pressure chamber 15 is gradually pressurized, forcing the diaphragm 12 to expand radially outward, gradually squeezing the liquid delivery chamber 14, and then squeezing the fluid in the liquid delivery chamber 14 into the liquid outlet 16.

[0063] Thus, the air inlet 33, the intake valve 32 and the air passage 34 introduce the compressed gas into the air pressure chamber 15. By intake and exhaust of the air pressure chamber 15, the diaphragm contracts and expands repeatedly, and the extraction and pumping of the liquid are realized.

[0064] However, during the pumping process, if the diaphragm 12 cannot be separated from the housing 11 in time, especially when the diaphragm 12 accidentally adheres to the liquid outlet 16, it will affect the output of the liquid to be transported. At the same time, the housing 11 is relatively deep and the liquid path is long, which is not conducive to the continuity and smoothness of pumping the liquid.

[0065] Therefore, the diaphragm pump described in the present invention further includes a liquid through groove 50 provided on the inner wall of the housing that defines the liquid delivery chamber. Specifically, as Figures 7 to 9As shown, the liquid passage groove 50 communicates with the liquid outlet 16. In this way, the liquid to be transported can flow from the liquid transport chamber 14 to the liquid outlet 16, or can also flow from the liquid passage groove 50 to the liquid outlet 16. As the second path for the liquid to flow out, the liquid passage groove 50 can ensure the continuity of liquid pumping.

[0066] During the liquid pumping process of the diaphragm pump, the liquid can exist in both the liquid transport chamber 14 and the liquid passage groove 50 at the same time. Therefore, this liquid passage groove structure can promote the flow of the fluid to be transported in the liquid transport chamber 14, and it is not easy to produce liquid accumulation or blockage of the inner liquid outlet, thereby improving the fluidity of the pumped liquid and reducing the dependence on the accuracy and material properties of the diaphragm elastomer.

[0067] Preferably, in some embodiments, the liquid passage groove 50 includes a crisscrossed network groove path. For example, the liquid passage groove includes a plurality of annular grooves 51 located at the bottom and / or middle and / or top of the liquid transport chamber and longitudinal grooves 52 connecting the annular grooves 51. The longitudinal grooves 52 and / or the annular grooves 51 communicate with the liquid inlet 16, as Figure 8 shown. In this way, even if the diaphragm 12 is close to the inner wall of the housing 11 or the liquid outlet 16, the liquid in the liquid transport chamber 14 can still communicate with the liquid outlet 16 through the crisscrossed liquid passage groove 50, and finally flow through the liquid passage groove 50, the liquid outlet 16, and the liquid outlet passage 19 to the liquid outlet pipe 21.

[0068] In some other embodiments, the liquid passage groove 50 may also only include the annular groove 51 or the longitudinal groove 52.

[0069] Considering the flow of the liquid, the preferred range of the ratio of the groove depth to the groove width of the liquid passage groove 50 is 1:15 to 2:1. The groove depth refers to the depth radially inward from the inner wall surface of the housing 11, and the preferred range of the groove depth is 0.2 to 2 mm, such as 0.25 mm, 0.5 mm, 1 mm, 1.5 mm, 1.75 mm. The groove width refers to the length in the circumferential direction of the housing, and the preferred range of the groove width is 1 to 3 mm, such as 1 mm, 1.5 mm, 2 mm, 2.5 mm, 2.75 mm. If the groove width is too large, the diaphragm will squeeze into the liquid passage groove during the expansion process, blocking the liquid flow. If the groove depth is too large, the strength of the pump housing is too weak. If the groove width and groove depth are too small, the flow area is not enough and it will be blocked.

[0070] In some embodiments, shortening the structure of the housing 11 and increasing the outer diameter can further promote the flow of the fluid in the liquid transport chamber 14. The length L of the housing 11 refers to Figure 5As shown, the outer diameter refers to the diameter W at the middle of the housing 11. Preferably, the aspect ratio L / W of the housing ranges from 2:1 to 2.5:1, and more preferably, it is 2.3:1. The above aspect ratio makes the housing 11 have a short and small size, reduces the liquid pumping height, reduces the resistance during the pumping process, improves the liquid flow performance, significantly reduces the air consumption, can also reduce the difficulty of the processing technology, increases the process selectivity, and reduces the processing energy consumption and product weight.

[0071] Continue to refer to Figure 6 As shown, in some embodiments, the opening of the air passage 34 on the diaphragm core 13 is set lower than the liquid outlet 16, which can also prevent the diaphragm 12 from sticking to the liquid outlet 16 by mistake when air enters the air pressure chamber 15.

[0072] The above structure can efficiently, stably and continuously pump liquid by means of the design of the liquid passage groove and the good aspect ratio of the housing, improves the liquid pumping performance and reliability of the diaphragm pump, and solves the problems existing in the existing diaphragm pump, such as easy wear of the diaphragm, too high requirements for processing accuracy and materials, and discontinuous liquid transportation.

[0073] This application uses specific terms to describe the embodiments of this application. Such as "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of this application can be combined appropriately.

[0074] In some embodiments, numbers describing the composition and attribute quantity are used. It should be understood that such numbers used to describe the embodiments, in some examples, are modified by the modifiers "about", "approximately" or "substantially". Unless otherwise specified, "about", "approximately" or "substantially" indicate that the number allows a change of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, and this approximate value can change according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should consider the specified significant digits and adopt the method of retaining the general number of digits. Although the numerical ranges and parameters used to confirm the scope breadth in some embodiments of this application are approximate values, in specific embodiments, the setting of such numerical values is as precise as possible within the feasible range.

[0075] Although the present invention is disclosed above in preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, all modifications, equivalent changes and decorations made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention fall within the protection scope defined by the claims of the present invention.

Claims

1. Diaphragm pump, including a pump core, the pump core comprising a housing, a diaphragm and a diaphragm core located within the housing, the diaphragm and the housing defining a liquid delivery chamber, the diaphragm and the diaphragm core defining a pneumatic chamber, characterized in that, An outlet and a liquid passage groove are further provided on the inner wall of the housing defining the liquid delivery chamber, the outlet communicating the liquid delivery chamber with the outside of the diaphragm pump, and the liquid passage groove communicating with the outlet.

2. The diaphragm pump according to claim 1, characterized in that, The liquid passage groove includes a crisscrossed network groove path.

3. The diaphragm pump according to claim 1, wherein The liquid passage groove includes at least one annular groove located at the bottom and / or middle and / or top of the liquid delivery chamber.

4. The diaphragm pump according to claim 1, characterized in that, The liquid passage groove includes longitudinal grooves.

5. The diaphragm pump according to claim 1, characterized in that, The ratio of the groove depth to the groove width of the liquid passage groove is 1:15 to 2:

1.

6. The diaphragm pump according to claim 1, wherein, The groove depth range of the liquid passage groove is 0.2 to 2 mm.

7. The diaphragm pump according to claim 1, wherein, The groove width of the liquid passage groove is 1 to 3 mm.

8. The diaphragm pump according to claim 1, characterized in that, The diaphragm is an elastic member, in the shape of a hollow elongated cup, and the diaphragm core is located inside the diaphragm and is adapted to the shape of the diaphragm.

9. The diaphragm pump according to claim 1, wherein The aspect ratio range of the housing is 2:1 to 2.5:

1.

10. The diaphragm pump according to claim 1, characterized in that, The diaphragm pump further includes a pump head, a liquid outlet pipe provided on the pump head, and a liquid outlet passage provided on the housing, the outlet communicating with the liquid outlet pipe through the liquid outlet passage.

11. The diaphragm pump according to claim 1, wherein, The diaphragm core includes an air passage, and the opening of the air passage is arranged lower than the outlet.

12. The diaphragm pump according to claim 1, characterized in that, The diaphragm pump further includes a liquid outlet valve connected to the outlet and an inlet valve communicating with the liquid delivery chamber, and the liquid outlet valve and the inlet valve are one-way valves.

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