Diaphragm pumps

Abstract

The present invention discloses a diaphragm pump, comprising: an upper cover assembly, the upper cover assembly defines an air inlet chamber and an air outlet chamber, the air outlet chamber has an air outlet and a pressure relief port, the upper cover assembly comprises: an upper cover and a pressure relief valve, the upper cover has an air outlet channel and a pressure relief channel, the air outlet channel is connected to the air outlet chamber, and the pressure relief valve is movably arranged in the pressure relief channel for opening or closing the pressure relief port; a piston assembly and a drive assembly, the upper cover assembly is formed with a first reflux hole, the piston assembly is formed with a second reflux hole connected to the first reflux hole, and the drive assembly constructs a pump diaphragm cavity, wherein the first reflux hole is connected to the pressure relief channel, and the second reflux hole is connected to the pump diaphragm cavity. According to the diaphragm pump of the embodiment of the present invention, by connecting the air outlet chamber with the air inlet chamber, the pressure relief space is increased, so that the diaphragm pump can quickly relieve pressure and keep the pressure in the diaphragm pump at the required pressure value.

Description

Technical Field

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

[0002] The traditional diaphragm pump has a slow discharge speed and cannot quickly reach the pressure value required by the user. Summary of the invention

[0003] The present invention aims to solve one of the above technical problems at least to a certain extent.

[0004] To this end, the present invention provides a diaphragm pump having a fast pressure relief speed.

[0005] According to an embodiment of the present invention, a diaphragm pump comprises: an upper cover assembly, a piston assembly and a drive assembly, wherein the upper cover assembly defines an air inlet chamber and an air outlet chamber, wherein the air outlet chamber has an air outlet and a pressure relief port; the upper cover assembly comprises: an upper cover and a pressure relief valve, wherein the upper cover has an air outlet channel, a pressure relief channel and an air inlet channel, wherein the air outlet channel is connected to the air outlet chamber, and the pressure relief valve is movably disposed in the pressure relief channel for opening or closing the pressure relief port; the upper cover assembly, the piston assembly and the drive assembly are connected in sequence, wherein the upper cover assembly is formed with a first reflux hole, the piston assembly is formed with a second reflux hole connected to the first reflux hole, and the drive assembly constructs a pump diaphragm cavity, wherein the first reflux hole is connected to the pressure relief channel, and the second reflux hole is connected to the air inlet channel.

[0006] According to the diaphragm pump of the embodiment of the present invention, the air outlet chamber is connected with the air inlet chamber, thereby increasing the pressure relief space, so that the diaphragm pump can quickly relieve pressure and keep the pressure in the diaphragm pump at a desired pressure value.

[0007] In addition, the diaphragm pump according to the embodiment of the present invention may also have the following additional technical features:

[0008] According to some embodiments of the present invention, the diaphragm pump further comprises: an elastic component, wherein the elastic component abuts against an upper surface of the pressure relief valve.

[0009] According to some embodiments of the present invention, the elastic component includes: a bushing, a compression spring and a stopper. The bushing defines an active cavity; one end of the compression spring abuts against the upper surface of the pressure relief valve; the stopper is clamped in the active cavity, and the other end of the compression spring extends upward along the extension direction of the active cavity and abuts against the lower end surface of the stopper.

[0010] According to some embodiments of the present invention, a positioning protrusion is formed on the upper surface of the closing portion extending upward, and one end of the compression spring is wound around the positioning protrusion.

[0011] According to some embodiments of the present invention, the elastic component further includes: a fixing seat, which is sleeved on the outer peripheral surface of the positioning protrusion, and the lower end of the fixing seat extends outward to form a positioning flange, and the lower surface of the positioning flange is in contact with the upper surface of the closing portion.

[0012] According to some embodiments of the present invention, a peripheral wall of the active cavity is formed with a plurality of guide ribs extending in an axial direction.

[0013] According to some embodiments of the present invention, the air outlet chamber is divided into a plurality of compartments, and a guide groove is provided between each compartment and the pressure relief port.

[0014] According to some embodiments of the present invention, the air flow channel formed by the air outlet chamber gradually decreases from the compartment to the guide groove.

[0015] According to some embodiments of the present invention, the upper cover assembly further includes:

[0016] A valve seat, wherein the valve seat has an air inlet and an air outlet;

[0017] The valve plate has an air inlet check valve for opening and closing the air inlet hole and an air outlet check valve for opening and closing the air outlet hole.

[0018] According to some embodiments of the present invention, the lower end surface of the sealing portion is provided with an annular lip, and the radial dimension of the annular lip is greater than the radial dimension of the pressure relief port.

[0019] According to some embodiments of the present invention, a limit column is provided on the top surface of the chamber, and the limit column and the gas outlet one-way valve are arranged opposite to each other in the up and down directions.

[0020] According to some embodiments of the present invention, the upper cover has an exhaust pipe, and the exhaust pipe is extended and has a 90-degree angle.

[0021] According to some embodiments of the present invention, the upper cover has a third reflow hole, and the third reflow hole is communicated with the air inlet chamber.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 is a cross-sectional view of a diaphragm pump according to an embodiment of the present invention;

[0025] Figure 2 is a top view of an upper cover according to an embodiment of the present invention;

[0026] Figure 3 is a three-dimensional diagram of an upper cover according to an embodiment of the present invention;

[0027] Figure 4 yes Figure 3 Sectional view along line AA;

[0028] Figure 5 is a cross-sectional view of an elastic component and a pressure relief valve according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] Diaphragm pump 100;

[0031] Upper cover assembly 10; air inlet chamber 11; air outlet chamber 12; air outlet 121; pressure relief port 122; compartment 123; guide groove 124; air outlet channel 13; pressure relief channel 14; first pressure relief channel 141; second pressure relief channel 142; air inlet channel 15; upper cover 16; first reflux hole 161; third reflux hole 162; limiting column 163; valve plate 17; valve seat 18; exhaust pipe 19;

[0032] Pressure relief valve 20; positioning protrusion 221;

[0033] Elastic component 30; bushing 31; movable cavity 32; guide rib 321; compression spring 33; stopper 34; fixing seat 35; positioning flange 351;

[0034] Piston assembly 40 ; mounting seat 41 ; air bag 42 ; base plate 421 ; bag cavity 422 ; second reflux hole 43 .

[0035] Driving assembly 50; driving motor 51; transmission shaft 52; connecting rod assembly 53; pump membrane chamber 54. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] The diaphragm pump in the related art will produce a puffing sound of air flow during the pressure relief process, which makes the user feel uncomfortable. Especially when the diaphragm pump is used in car seats, the quiet car environment makes the pressure relief air flow sound particularly obvious.

[0038] Refer to the following Figures 1 to 5The diaphragm pump 100 according to an embodiment of the present invention is described, and the diaphragm pump 100 is widely used in the fields of medical equipment, household appliances, and car seats. Figure 1 The figure shows the pressure relief process of the diaphragm pump 100 . The diaphragm pump 100 may generally include: an upper cover assembly 10 , a piston assembly 40 and a drive assembly 50 .

[0039] Specifically, Figure 1 As shown, the upper cover assembly 10 includes: an upper cover 16, a valve plate 17 and a valve seat 18. The upper cover assembly 10 defines an air inlet chamber 11 and an air outlet chamber 12. The air outlet chamber 12 has an air outlet 121 and a pressure relief port 122. The upper cover 16 has an air outlet channel 13, a pressure relief channel 14 and an air inlet channel 15. The pressure relief channel 14 includes a first pressure relief channel 141 and a second pressure relief channel 142. The air outlet channel 13 is connected to the air outlet chamber 12. A pressure relief valve 20 is provided at the pressure relief port 122 of the air outlet chamber 12. The pressure relief valve 20 is movably provided in the pressure relief channel 14 for opening or closing the pressure relief port 122.

[0040] The upper cover assembly 10, the piston assembly 40 and the driving assembly 50 are connected in sequence, the upper cover assembly 10 is formed with a first reflux hole 161, the piston assembly 40 is formed with a second reflux hole 43 connected with the first reflux hole 161, and the driving assembly 50 is configured with a pump diaphragm cavity 54, wherein the first reflux hole 161 is connected with the first pressure relief channel 141.

[0041] like Figure 1 As shown, the valve seat 18 is provided with an air inlet hole and an air outlet hole, and the valve plate 17 is provided with an air inlet check valve corresponding to the air inlet hole and an air outlet check valve corresponding to the air outlet hole.

[0042] like Figure 1 As shown, the piston assembly 40 includes a mounting seat 41 and an airbag 42, the mounting seat 41 has a mounting hole, the airbag 42 has a substrate 421, the upper surface of the substrate 421 is recessed downward to form a plurality of cavities 422, wherein the substrate 421 is attached to the surface of the mounting seat 41, the cavities 422 pass through the mounting hole, and the second reflux hole 43 is connected to the intake channel 15.

[0043] like Figure 1 As shown, the driving assembly 50 includes a driving motor 51, a transmission shaft 52 and a connecting rod assembly 53. The driving shaft of the driving motor 51 is connected to one end of the transmission shaft 52, and the other end of the transmission shaft 52 is connected to the connecting rod assembly 53. The connecting rod assembly 53 is connected to the piston assembly 40 to drive the capsule cavity 422 to stretch or squeeze.

[0044] The working process of the diaphragm pump 100 is roughly as follows: when the connecting rod assembly 53 stretches the sac cavity 422, the volume of the sac cavity 422 increases, and the gas is sucked into the air inlet chamber 11, the air inlet check valve opens, and the gas enters the sac cavity 422, completing the suction process; when the connecting rod assembly 53 squeezes the sac cavity 422, the volume of the sac cavity 422 decreases, the air outlet check valve opens, and the gas flows out of the sac cavity 422, and passes through the air outlet 121 and flows into the air outlet chamber 12, and finally flows out from the air outlet 121, completing the exhaust process; when the pressure in the air outlet chamber 12 exceeds the predetermined pressure, the pressure relief valve 20 opens to at least partially discharge the gas in the air outlet chamber 12, thereby playing a role in pressure relief.

[0045] In some specific embodiments, after the pressure relief valve 20 is opened, part of the airflow passes through the pressure relief port 122 and then enters the first pressure relief channel 141, flows downward through the first reflux hole 161 and the second reflux hole 43, and finally returns to the air intake chamber 12 through the air intake channel 15. Thus, the diaphragm pump 100 is prevented from delivering air to the inflation device at an overpressure. It is to be understood that the above embodiments are merely illustrative and are not intended to limit the scope of protection of the present invention, and the gas discharged from the pressure relief port 122 may also be directly discharged into the outside air.

[0046] According to the diaphragm pump 100 of the embodiment of the present invention, the air outlet chamber is connected with the air inlet chamber, thereby increasing the pressure relief space, so that the diaphragm pump can quickly relieve pressure and keep the pressure in the diaphragm pump at a desired pressure value.

[0047] In some embodiments of the present invention, Figure 1 Combination Figure 4 and Figure 5 As shown, the diaphragm pump 100 also includes: an elastic component 30, which abuts against the upper surface of the pressure relief valve 20. It can be understood that the elastic component 30 has an initial elastic potential energy. Under normal circumstances, the elastic component 30 abutting against the pressure relief valve 20 limits the upward movement of the pressure relief valve 20. Once the pressure value of the air outlet chamber 12 exceeds the preset value, the pressure relief valve 20 can overcome the elastic force and move upward to open the pressure relief port.

[0048] In some embodiments, Figure 5The elastic component 30 includes: a bushing 31, a compression spring 33 and a stopper 34. The bushing 31 defines an active cavity 32, one end of the compression spring 33 stops at the upper surface of the pressure relief valve 20, the stopper 34 is clamped in the active cavity 32, and the other end of the compression spring 33 extends upward along the extension direction of the active cavity 32 and stops at the lower end surface of the stopper 34. In other words, the compression spring 33 is defined between the pressure relief valve 20 and the stopper 34. When the air pressure in the air outlet chamber 12 is less than a preset value, the compression spring 33 applies a downward force to the pressure relief valve 20, so that the pressure relief valve 20 closes the pressure relief port 122 to prevent the air outlet chamber 12 from leaking. When the air pressure in the air outlet chamber 12 is greater than the preset value, the pressure relief valve 20 is pushed open, the compression spring 33 is compressed, and the gas in the air outlet chamber 12 is discharged through the pressure relief port 122.

[0049] In an optional embodiment, the stopper 34 is interference fit with the bushing 31. That is, the diameter of the stopper 34 is slightly larger than the diameter of the active cavity 32, that is, the stopper 34 is relatively statically clamped in the active cavity 32 to limit the compression spring 33, wherein the stopper 34 can be a steel ball.

[0050] In a further optional embodiment, referring to Figure 1 and Figure 5 The upper surface of the pressure relief valve 20 extends upward to form a positioning protrusion 221, and one end of the compression spring 33 is wound around the positioning protrusion 221. In this way, the positioning protrusion 221 can prevent the compression spring 33 from shaking and improve the stability of the compression spring 33.

[0051] In a specific embodiment of the present invention, referring to Figure 5 As shown, the elastic component 30 also includes: a fixing seat 35, the fixing seat 35 is sleeved on the outer peripheral surface of the positioning protrusion 221, and the lower end of the fixing seat 35 extends outward to form a positioning flange 351, and the lower surface of the positioning flange 351 is in contact with the upper surface of the pressure relief valve. The material hardness of the pressure relief valve 20 is less than the material hardness of the fixing seat 35. For example, the pressure relief valve 20 is made of a flexible rubber material, and the fixing seat 35 is made of a plastic with a relatively high hardness, so that the compression spring 33 is in contact with the fixing seat 35 with a relatively high hardness, and then the compression spring 33 does not deviate in the active cavity 32, and has good stability.

[0052] In a preferred embodiment of the present invention, Figure 1 Combination Figure 5 As shown, the peripheral wall of the active cavity 32 is formed with a plurality of guide ribs 321 extending in the axial direction. The plurality of guide ribs 321 limit the freedom of the bushing 31 in the circumferential direction, restrict its circumferential rotation, and improve the overall stability of the elastic component 30.

[0053] In some embodiments of the present invention, Figure 3As shown, the air outlet chamber 12 is divided into a plurality of compartments 123 , and a guide groove 124 is provided between each compartment 123 and the pressure relief port 122 . The air flow channel formed by the air outlet chamber 12 gradually decreases from the compartment 123 to the guide groove 124 .

[0054] That is to say, the guide groove 124 is connected to the gap of the chamber 123, and the width of the guide groove 124 is equal to that of the gap, and the airflow passing through the narrow space becomes orderly. The gas entering the chamber 123 flows to the pressure relief port 122 in an orderly manner through the guide groove 124. In this way, the airflow guided by the guide has less impact on the diaphragm pump 100, thereby reducing the noise during the operation of the diaphragm pump 100.

[0055] In some preferred embodiments, Figure 3 , a limit column 163 is provided on the top surface of the chamber, and the limit column 163 is arranged opposite to the air outlet check valve in the up and down direction. During the operation of the diaphragm pump, the air outlet check valve is subjected to pressure to open the air outlet hole, but during long-term use, the inventor found through observation and experiment that sometimes, the air outlet check valve in the diaphragm pump 100 cannot be reset due to excessive expansion angle, thereby causing the diaphragm pump 100 to fail. In order to solve this problem, the inventor sets a limit column 163 at a position opposite to the air outlet check valve in each chamber 123, avoiding excessive expansion of the air outlet check valve and extending the service life of the diaphragm pump 100. In addition, the air outlet check valve with a limit effect will make the output flow of the diaphragm pump 100 stable each time, further reducing the noise generated during the operation of the diaphragm pump 100.

[0056] In some embodiments, Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the upper cover has an exhaust pipe 19, which is extended and has a 90-degree angle. The gas entering the exhaust pipe 19 changes its flow direction through a 90-degree bend, and the energy of the gas flow after the bend is reduced and the flow rate is slowed down, so the friction with the exhaust pipe wall becomes gentle, further reducing the noise of the diaphragm pump 100.

[0057] In some embodiments, Figure 1 As shown, the upper cover 16 also has a third reflux hole 162, and the third reflux hole 162 is connected to the air inlet chamber 11. When the pressure relief valve 20 is opened, part of the air flow passes through the pressure relief port 122 and then enters the second pressure relief channel 142, and directly flows to the air inlet chamber 11 through the third reflux hole 162. During the air intake process of the diaphragm pump 100, the gas that flows back into the air inlet chamber 11 enters the air inlet channel 15 again, thereby achieving the purpose of pressure relief. Among them, the first pressure relief channel 141 and the second pressure relief channel 142 can be arranged relatively independently, that is, the diaphragm pump 100 is provided with at least one of the pressure relief channels 14.

[0058] The other structures and operations of the diaphragm pump 100 are understood and easily obtained by ordinary technicians in the field, and will not be described in detail here.

[0059] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "inside", "outside", "front", "back", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0060] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0062] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A diaphragm pump, characterized in that: include: An upper cover assembly (10), the upper cover assembly (10) defining an air inlet chamber (11) and an air outlet chamber (12), the air outlet chamber (12) having an air outlet (121) and a pressure relief port (122), the upper cover assembly (10) comprising: An upper cover (16), the upper cover (16) having an air outlet channel (13), a pressure relief channel (14) and an air inlet channel (15), the air outlet channel (13) being in communication with the air outlet chamber (12); a pressure relief valve (20), the pressure relief valve (20) being movably disposed in the pressure relief channel (14) and used for opening or closing the pressure relief port (122); A piston assembly (40) and a drive assembly (50), wherein the upper cover assembly (10), the piston assembly (40) and the drive assembly (50) are connected in sequence, the upper cover assembly (10) is formed with a first reflux hole (161), the piston assembly (40) is formed with a second reflux hole (43) communicating with the first reflux hole (161), and the drive assembly (50) is provided with a pump diaphragm cavity (54), wherein the first reflux hole (161) is communicated with the pressure relief channel (14), and the second reflux hole (43) is communicated with the air intake channel (15); An elastic component (30), wherein the elastic component (30) abuts against an upper surface of the pressure relief valve (20).

2. The diaphragm pump according to claim 1, characterized in that: The elastic component (30) comprises: A bushing (31), wherein the bushing (31) defines an active cavity (32); A compression spring (33), one end of the compression spring (33) abutting against the upper surface of the pressure relief valve (20); A limiting member (34) is clamped in the movable cavity (32), and the other end of the compression spring (33) extends upward along the extension direction of the movable cavity (32) and stops at the lower end surface of the limiting member (34).

3. The diaphragm pump according to claim 2, characterized in that: A positioning protrusion (221) is formed on the upper surface of the pressure relief valve (20) and extends upward, and one end of the compression spring (33) is wound around the positioning protrusion (221).

4. The diaphragm pump according to claim 3, characterized in that: The elastic component (30) further comprises: a fixing seat (35), the fixing seat (35) being sleeved on the outer peripheral surface of the positioning protrusion (221), the lower end peripheral edge of the fixing seat (35) extending outward to form a positioning flange (351), the lower surface of the positioning flange (351) being in contact with the upper surface of the pressure relief valve (20).

5. The diaphragm pump according to claim 2, characterized in that: The peripheral wall of the active cavity (32) is formed with a plurality of guide ribs (321) extending in the axial direction.

6. The diaphragm pump according to claim 1, characterized in that: The air outlet chamber (12) is divided into a plurality of compartments (123), and a guide groove (124) is provided between each compartment (123) and the pressure relief port (122).

7. The diaphragm pump according to claim 6, characterized in that: The air flow channel formed by the air outlet chamber (12) gradually decreases from the compartment (123) to the guide groove (124).

8. The diaphragm pump according to claim 6, characterized in that: The upper cover assembly (10) further comprises: A valve seat (18), wherein the valve seat (18) has an air inlet and an air outlet; A valve plate (17), wherein the valve plate (17) has an air inlet check valve for opening and closing the air inlet hole and an air outlet check valve for opening and closing the air outlet hole.

9. The diaphragm pump according to claim 8, characterized in that: A limit column (163) is provided on the top surface of the chamber (123), and the limit column (163) and the gas outlet one-way valve are arranged opposite to each other in the up and down directions.

10. The diaphragm pump according to claim 1, characterized in that: The upper cover (16) has an exhaust pipe (19), and the exhaust pipe (19) is extended and has a 90-degree angle.

11. The diaphragm pump according to claim 1, characterized in that: The upper cover (16) has a third return hole (162), and the third return hole (162) is communicated with the air inlet chamber (11).

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