Miniature diaphragm pump

Abstract

The utility model relates to a miniature diaphragm pump which comprises an upper cover and a pump body, the pump body comprises a cylinder body and a valve plate, the valve plate is connected with the upper cover, a liquid inlet channel and a liquid outlet channel are arranged on the valve plate, a first one-way valve is arranged on the liquid outlet channel, a second one-way valve is arranged in the liquid inlet channel, and the cylinder body is connected with the other side of the valve plate. A plurality of first sealing cavities are formed between the cylinder body and the valve plate, the upper ends of leather cups of the liquid storage assembly are all communicated with the first sealing cavities, the driving mechanism enables the leather cups to be extruded and deformed in the axial direction, and the liquid outlet channels are arranged corresponding to the axial directions of the leather cups, so that the preferential lifting sides of the leather cups are the same as the sides where the liquid outlet channels are located; the pump body and the upper cover are assembled to be capable of restraining and fixing the first one-way valve and the second one-way valve, the fluid conveying capacity of the diaphragm pump is higher, cutting abrasion caused by shaking of the first one-way valve and the second one-way valve can be avoided, and therefore the service life of the first one-way valve and the service life of the second one-way valve can be effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm pumps, in particular to a micro diaphragm pump. Background Art

[0002] Micro diaphragm pumps are widely used in small household appliances, testing equipment, medical equipment and other fields. Its principle of action is a device that increases the pressure of liquid or gas to make the liquid or gas flow. Its essence is a device that moves liquid or gas media through a pressure difference.

[0003] In the actual design of some existing micro diaphragm pumps, the micro diaphragm pump relies on the negative pressure generated by the expansion of the leather cup cavity to suck liquid, and pumps out the liquid flow by squeezing the leather cup cavity. Its operating principle is as follows: the diaphragm pump rotates the eccentric wheel, and through the deflection angle of the eccentric hole of the eccentric wheel, the swing leaf of the swing frame generates a periodic lifting and lowering movement, thereby making the leather cup cavity periodically squeeze and expand. When the swing leaf of the swing frame moves downward, the leather cup cavity is stretched and expanded. At this time, the umbrella nail (inlet check valve) opens downward, the valve piece (outlet check valve) adsorbs and fits with the valve plate, and the fluid enters the leather cup cavity from the inlet channel. When the swing leaf of the swing frame lifts upward, the leather cup cavity is squeezed. At this time, the umbrella nail adsorbs and fits with the valve plate, the valve piece opens upward, and the fluid is pumped out from the outlet channel. However, the existing micro diaphragm pump design has at least the following problems: one is the problem that the umbrella nail is easily broken. There is no limit during the downward opening of the umbrella nail. After being impacted by the liquid flow, the umbrella nail column will be overstretched and rotated, and the umbrella nail will shake around and cut with the umbrella nail hole of the valve plate umbrella groove. The second is the problem of low flow rate. The lifting and lowering of the swing frame both start from the outside, not the liquid level lifting and lowering. The fluid generally flows in from the outside and out in the middle. When the leather cup cavity is squeezed, the squeezing side and the liquid outlet side are on different sides, increasing the energy loss and reducing the flow performance. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a micro diaphragm pump, aiming to solve the problems of easy breakage of the umbrella nail and low flow rate in the above technical problems, so that the micro diaphragm pump has a longer service life and more stable performance.

[0005] The following technical solutions are adopted to solve the technical problems in the utility model:

[0006] A micro diaphragm pump, comprising:

[0007] An upper cover, on which a liquid inlet and a liquid outlet are provided;

[0008] A pump body, including a cylinder block and a valve plate, the valve plate is connected to the upper cover;

[0009] A liquid inlet channel and a liquid outlet channel are arranged on the valve plate, and the liquid inlet channel and the liquid outlet channel are respectively communicated with the liquid inlet and the liquid outlet;

[0010] A first one-way valve is arranged on the liquid outlet channel, and a second one-way valve is arranged in the liquid inlet channel. The cylinder block is connected to the other side of the valve plate, and a plurality of first sealing cavities are formed between the cylinder block and the valve plate. Both the liquid inlet channel and the liquid outlet channel communicate with the first sealing cavity;

[0011] A liquid storage assembly, the liquid storage assembly includes a leather cup, and the upper ends of the leather cups are all communicated with the first sealing cavity;

[0012] A driving mechanism, the driving mechanism is used to squeeze the leather cup and cause the leather cup to be axially deformed;

[0013] Wherein, the liquid outlet channel is arranged corresponding to the axial direction of the leather cup, and the pump body and the upper cover are assembled to be able to implement the restraint and fixation of the first one-way valve and the second one-way valve.

[0014] The present utility model also has the following technical features:

[0015] In an embodiment of the present utility model, multiple groups of the leather cups are arranged along the circumferential direction of the pump body. A plurality of liquid outlet holes are arranged on the valve plate, and the plurality of liquid outlet holes converge to form the liquid outlet channel. Multiple groups of the leather cups are arranged on the liquid storage assembly and are arranged corresponding to the liquid outlet holes, and the first one-way valve is arranged at the orifice position of the liquid outlet hole;

[0016] A liquid inlet hole is arranged at the center of the valve plate, the liquid inlet hole constitutes the liquid inlet channel, and the second one-way valve is arranged at the orifice position formed by the liquid inlet channel.

[0017] In an embodiment of the present utility model, the first one-way valve includes a first flexible valve sheet and a first valve rod. The first valve rod is arranged at the center position of the first flexible valve sheet, the first valve rod is fixed on the first valve plate, and the first flexible valve sheet is separated or combined with the orifice edge of the liquid outlet hole;

[0018] The second one-way valve includes a second flexible valve sheet and a second valve rod. The second valve rod is arranged at the center position of the second flexible valve sheet, the second valve rod is fixed on the valve plate, and the second flexible valve sheet is separated or combined with the orifice edge of the liquid inlet hole.

[0019] In an embodiment of the present utility model, the liquid outlet hole is formed by enclosing multiple groups of unit holes. A first installation hole is arranged among the multiple groups of unit holes. A first protrusion is arranged on the rod body of the first valve rod, and the first protrusion and the first installation hole form an interference fit;

[0020] The liquid inlet holes include multiple groups, and a second mounting hole is provided between the multiple groups of liquid inlet holes. A second protrusion is provided on the rod body of the second valve stem, and the second protrusion and the second mounting hole form an interference fit.

[0021] In an embodiment of the present invention, a restraining ejector rod is provided on the upper cover, and the restraining ejector rod is arranged corresponding to the position of the liquid outlet hole. The rod end of the restraining ejector rod abuts against the outer side surface of the first flexible valve sheet of the first one-way valve.

[0022] In an embodiment of the present invention, the first flexible valve sheet of the first one-way valve is installed between the valve plate and the upper cover, and the second one-way valve is installed between the cylinder block and the valve plate;

[0023] The second flexible valve sheet is in sealed abutment with the edge of the leather cup.

[0024] In an embodiment of the present invention, an annular portion is provided on the end face of the upper cover, and the lower end of the annular portion abuts against the valve plate to divide the internal space of the upper cover into a second sealing cavity and a third sealing cavity. The two ends of the second sealing cavity are respectively communicated with the liquid inlet and the liquid inlet channel, and the two ends of the third sealing cavity are respectively communicated with the liquid outlet and the liquid outlet channel.

[0025] In an embodiment of the present invention, the driving mechanism includes:

[0026] A driving motor, the output end of the driving motor and the leather cup are connected through a connecting component;

[0027] A bottom cover, one end of the bottom cover is connected to the driving motor, the other end of the bottom cover is connected to one end of the cylinder block, and the connecting component is arranged inside the bottom cover.

[0028] In an embodiment of the present invention, the connecting component includes:

[0029] A swing frame, the swing frame is connected to one end of the leather cup;

[0030] A connecting shaft, one end of the connecting shaft is connected to the middle of the swing frame;

[0031] An eccentric wheel, the eccentric wheel is connected to the output end of the driving motor.

[0032] In an embodiment of the present invention, a sealing gasket is clamped between the upper cover and the valve plate.

[0033] Compared with the prior art, the beneficial effects of the present utility model are as follows: during use, fluid can be sent into the leather cup through the liquid inlet and the liquid inlet channel, and the leather cup is squeezed by the driving mechanism, so that the fluid in the leather cup flows out through the liquid outlet channel and enters the liquid outlet. When the leather cup is arranged along the axial direction of the liquid outlet channel and deforms along the axial direction, the preferential lifting side of the leather cup is on the same side as the side where the liquid outlet channel is located, and the liquid stored in the leather cup is quickly pushed out to open the first one-way valve, thereby significantly enhancing the flow rate of the pump body and enhancing the ability of the diaphragm pump to transport fluid. Moreover, the pump body and the upper cover can restrain and fix the first one-way valve and the second one-way valve, avoiding the cutting wear caused by the shaking of the first one-way valve and the second one-way valve, and thus effectively improving the service life of the first one-way valve and the second one-way valve. Description of the Drawings

[0034] Figure 1 Schematic diagram of the overall structure of the micro diaphragm pump in an embodiment of the present utility model

[0035] Figure 2 Exploded view of the micro diaphragm pump in an embodiment of the present utility model;

[0036] Figure 3 Schematic diagram of the structure of the micro diaphragm pump after removing the upper cover in an embodiment of the present utility model;

[0037] Figure 4 Schematic diagram of the structure of the cooperation of the driving mechanism, liquid storage assembly, first one-way valve and second one-way valve in the micro diaphragm pump in an embodiment of the present utility model;

[0038] Figure 5 Schematic diagram of the structure of the upper cover in the micro diaphragm pump in an embodiment of the present utility model;

[0039] Figure 6 Schematic diagram of the structure of the valve plate in the micro diaphragm pump in an embodiment of the present utility model;

[0040] Figure 7 and Figure 8 Schematic diagrams of two perspectives of the cooperation of the valve plate, first one-way valve and second one-way valve in the micro diaphragm pump in an embodiment of the present utility model;

[0041] Figure 9 Schematic diagram of the structure of the cylinder block in the micro diaphragm pump in an embodiment of the present utility model;

[0042] Explanation of the reference numerals in the drawings:

[0043] 10. Upper cover; 11. Liquid inlet; 12. Liquid outlet; 13. Constraint ejector rod;

[0044] 20. Pump body; 21. Cylinder block; 22. Valve plate; 221. Liquid outlet hole; 2211. First mounting hole; 222. Liquid inlet hole; 2221. Second mounting hole;

[0045] 30. First one-way valve; 31. First flexible valve piece; 32. First valve stem; 321. First protrusion;

[0046] 40. Second one-way valve; 41. Second flexible valve piece; 42. Second valve stem; 421. Second protrusion;

[0047] 50. Liquid storage assembly; 51. Leather cup;

[0048] 61. Driving motor; 62. Bottom cover;

[0049] 71. Swing frame; 72. Connecting shaft; 73. Eccentric wheel;

[0050] 80. Sealing gasket;

[0051] a. First sealing cavity; b. Second sealing cavity; c. Third sealing cavity; d. Leather cup mounting hole position; e. Groove. Detailed implementation mode

[0052] The following uses specific specific examples to illustrate the implementation mode of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0053] It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components during actual implementation. The type, quantity, and ratio of each component during actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0054] It should be noted that during the actual use of a micro diaphragm pump, relatively high requirements are placed on the pumping performance and service life of the pump. In existing diaphragm pumps, the overall design of the umbrella-shaped part is a mushroom-like structure. As a key component for the diaphragm pump to form a sealed chamber, the umbrella-shaped part is particularly crucial for the performance and service life of the pump. When the existing umbrella-shaped part is installed inside the diaphragm pump, it is generally fixedly connected through the interference fit between the umbrella-shaped part and the pump body. Since there is no axial limit for the umbrella-shaped part, when the liquid impacts the umbrella-shaped part, the column of the installation hole between the umbrella-shaped part and the pump body will be overstretched and rotated, and the umbrella-shaped part will shake around and cut the umbrella-shaped hole in the valve plate umbrella-shaped groove, resulting in the problem of the umbrella-shaped part breaking. The key component for the pump body to move the liquid is the leather cup. By squeezing the leather cup, the movement of the liquid is realized. However, since the compression direction of the leather cup in the existing diaphragm pump is at the liquid inlet position of the liquid flow channel, when the diaphragm pump squeezes the liquid out from the leather cup position, the extrusion side of the leather cup is the same as the inlet side, thus causing a certain loss of the kinetic energy of the liquid and reducing the pumping performance of the entire diaphragm pump. In response to this, the present utility model proposes a micro diaphragm pump, including: an upper cover 10, on which a liquid inlet 11 and a liquid outlet 12 are provided; a pump body 20, including a cylinder block 21 and a valve plate 22, the valve plate 22 being connected to the upper cover 10; a liquid inlet channel and a liquid outlet channel are provided on the valve plate 22, and the liquid inlet channel and the liquid outlet channel are respectively communicated with the liquid inlet 11 and the liquid outlet 12; a first one-way valve 30 is provided on the liquid outlet channel, and a second one-way valve 40 is provided in the liquid inlet channel. The cylinder block 21 is connected to the other side of the valve plate 22, and a plurality of first sealed chambers a are formed between the cylinder block 21 and the valve plate 22. Both the liquid inlet channel and the liquid outlet channel are communicated with the first sealed chamber a; a liquid storage assembly 50, the liquid storage assembly 50 including a leather cup 51, the upper end of the leather cup 51 being communicated with the first sealed chamber a; a driving mechanism for squeezing the leather cup 51 and deforming the leather cup 51 axially; wherein, the liquid outlet channel is arranged corresponding to the axial direction of the leather cup 51, and the pump body 20 and the upper cover 10 are assembled to be able to constrain and fix the first one-way valve 30 and the second one-way valve 40.

[0055] In one embodiment, referring to Figure 1 and Figure 2The diaphragm pump as a whole comprises an upper cover 10, a pump body 20, a liquid storage component and a driving mechanism connected in sequence, and the whole presents a cylindrical shape or other shapes suitable for the use of the equipment, wherein the valve plate 22 in the pump body 20 is fixed to the upper cover 10 as a whole, and the leather cup 51 of the liquid storage component 50 is installed on the cylinder 21 of the pump body 20. When the driving mechanism drives the leather cup 51 to compress and deform along the axial direction, the liquid in the liquid inlet 11 of the upper cover 10 opens the second one-way valve 40 under the action of negative pressure, and the liquid enters the second one-way valve 40 through the liquid inlet channel. In a sealed cavity a, as the leather wrist 51 continues to be compressed, the second one-way valve 40 is closed. Under the action of pressure, the first one-way valve 30 of the liquid outlet channel is opened, and the liquid is squeezed out. The liquid outlet channel is arranged in the axial direction of the leather cup 51, so the extrusion direction of the squeezed liquid is staggered with the liquid entry direction of the liquid inlet channel. That is, it can also be understood that the preferential lifting side of the leather cup 51 is on the same side as the side where the liquid outlet channel is located, which can effectively reduce the loss of liquid kinetic energy and effectively improve the pumping performance of the entire diaphragm pump.

[0056] In one embodiment, see Figure 2 The first one-way valve 30 and the second one-way valve 40 are constrained between the pump body 20 and the upper cover 10. The pump body 20 and the upper cover 10 can be used to constrain the first one-way valve 30 and the second one-way valve 40 in the axial direction, thereby avoiding the cutting wear caused by the shaking of the first one-way valve 30 and the second one-way valve 40, thereby effectively improving the service life of the first one-way valve 30 and the second one-way valve 40, thereby improving the service life of the entire micro diaphragm pump.

[0057] In a preferred embodiment, in order to improve the pumping performance of the entire diaphragm pump, refer to Figure 4 The leather cups 51 are provided in multiple groups along the circumferential direction of the pump body 20, the valve plate 22 is provided with multiple liquid outlet holes 221, and the multiple liquid outlet holes 221 are gathered to form the liquid outlet channel. The leather cups 51 are provided in multiple groups on the liquid storage assembly 50 and are arranged corresponding to the liquid outlet holes 221. The first one-way valve 30 is provided at the orifice position of the liquid outlet hole 221;

[0058] In one embodiment, see Figure 6 At least 2-4 groups, preferably three groups, of liquid outlet holes 221 are arranged around the liquid outlet holes 221, wherein the first one-way valve 30 is arranged according to the number and position of the liquid outlet holes 221. The first one-way valve 30 blocks or opens the orifice of the liquid outlet hole 221 to facilitate the inflow and outflow of liquid.

[0059] In a specific embodiment, see Figure 6 A liquid inlet hole 222 is provided at the center of the valve plate 22, and the liquid inlet hole 222 constitutes the liquid inlet channel. The second one-way valve 40 is provided at the orifice position formed by the liquid inlet channel.

[0060] Preferably, the liquid inlet holes 222 include multiple groups, and the multiple groups of liquid inlet holes 222 are arranged along the circumferential direction of the valve plate 22, forming a liquid inlet channel. The second one-way valve 40 is used to achieve one-way cut-off of the liquid inlet holes 222.

[0061] In one embodiment, referring to Figure 7 and Figure 8 , the first one-way valve 30 includes a first flexible valve sheet 31 and a first valve stem 32. The first valve stem 32 is arranged at the center position of the first flexible valve sheet 31. The first valve stem 32 is fixed on the first valve plate 22, and the first flexible valve sheet 31 is separated from or combined with the orifice edge of the liquid outlet hole 221.

[0062] In a specific embodiment, referring to Figure 7 and Figure 8 , the first flexible valve sheet 31 is made of rubber material and has deformable properties. Under the extrusion pressure of the leather wrist 51, the first flexible valve sheet 31 deforms, so that the liquid flow is led out from the liquid outlet hole 221. And the first valve stem 32 is fixed on the valve plate 22 to fix the first one-way valve 30 and prevent the first one-way valve 30 from shaking.

[0063] Similarly, referring to Figure 7 and Figure 8 , the second one-way valve 40 includes a second flexible valve sheet 41 and a second valve stem 42. The second valve stem 42 is arranged at the center position of the second flexible valve sheet 41. The second valve stem 42 is fixed on the valve plate 22, and the second flexible valve sheet 41 is separated from or combined with the orifice edge of the liquid inlet hole 222.

[0064] In a specific embodiment, the second one-way valve 40 is also made of rubber material. Under the extrusion pressure of the leather wrist, the second flexible valve sheet 41 deforms, so that the liquid flow enters the first sealing cavity a from the liquid inlet hole 222. And the second valve stem 42 is fixed on the valve plate 22 to fix the second one-way valve 40 and prevent the second one-way valve 40 from shaking.

[0065] In one embodiment, referring to Figure 7 and Figure 8 , to implement the constraint fixation of one end of the first one-way valve 30, the liquid outlet hole 221 is formed by enclosing multiple groups of unit holes. A first mounting hole 2211 is arranged among the multiple groups of unit holes. A first protrusion 321 is arranged on the rod body of the first valve stem 32, and the first protrusion 321 and the first mounting hole 2211 form an interference fit.

[0066] In one embodiment, to implement the restraint and fixation of one end of the second one-way valve 40, the liquid inlet holes 222 include multiple groups. A second mounting hole 2221 is provided among the multiple groups of liquid inlet holes 222. A second protrusion 421 is provided on the rod body of the second valve stem 42. The second protrusion 421 and the second mounting hole 2221 form an interference fit.

[0067] In one embodiment, referring to Figure 2 and Figure 5 , to implement the fixation of the other end of the first one-way valve 30, a restraint ejector rod 13 is provided on the upper cover 10. The restraint ejector rod 13 is arranged corresponding to the position of the liquid outlet hole 221. The rod end of the restraint ejector rod 13 abuts against the outer side surface of the first flexible valve sheet 31 of the first one-way valve 30, so that the center of the first flexible valve sheet 31 of the first one-way valve 30 is tightly constrained on the valve plate 22, avoiding the shaking of the first one-way valve 30 and thus avoiding the damage of the first one-way valve 30.

[0068] In a specific embodiment, to give play to the functions of the first one-way valve 30 and the second one-way valve 40, the first flexible valve sheet 31 of the first one-way valve 30 is installed between the valve plate 22 and the upper cover 10, and the second one-way valve 40 is installed between the cylinder block 21 and the valve plate 22;

[0069] In one embodiment, referring to Figure 4 , to implement the restraint and fixation of the other end of the second one-way valve 40, the second flexible valve sheet 41 is in sealed abutment with the edge of the leather cup 51.

[0070] In a specific implementation manner, referring to Figure 5 , an annular portion is provided on the end face of the upper cover 10. The end face of the annular portion abuts against the valve plate 22 to divide the internal space of the upper cover 10 into a second sealing cavity b and a third sealing cavity c. The two ends of the second sealing cavity b are respectively communicated with the liquid inlet 11 and the liquid inlet passage, and the two ends of the third sealing cavity c are respectively communicated with the liquid outlet 12 and the liquid outlet passage.

[0071] In a specific embodiment, referring to Figure 5 and Figure 6 , a protrusion is provided on the edge of the end face of the upper cover 10. The protrusion is arranged around the edge of the third sealing cavity c. A groove is provided on the edge of the end face of the valve plate 22. When the upper cover 10 abuts against the valve plate 22, the protrusion extends into the groove to ensure the sealing reliability of the combination between the valve plate 22 and the upper cover 10 and avoid liquid leakage; an annular protrusion also surrounds the edge of the second sealing cavity b, and an annular groove is also provided at the center of the end face of the valve plate 22. When the upper cover 10 abuts against the valve plate 22, the annular protrusion extends into the annular groove to ensure the sealing reliability of the combination between the valve plate 22 and the upper cover 10.

[0072] In a preferred embodiment, involved in Figure 2 , to further ensure the reliable sealing of the combination of the valve plate 22 and the upper cover 10, a sealing gasket 80 is clamped between the upper cover 10 and the valve plate 22.

[0073] In this way, the connection between the upper cover 10 and the valve plate 22 is made closer, avoiding liquid leakage due to the appearance of gaps.

[0074] In a specific embodiment, involved in Figure 2 and Figure 4 , the driving mechanism includes:

[0075] A driving motor 61, the output end of the driving motor 61 and the leather cup 51 are connected through a connecting component;

[0076] A bottom cover 62, one end of the bottom cover 62 is connected to the driving motor 61, the other end of the bottom cover 62 is connected to one end of the cylinder block 21, and the connecting component is arranged inside the bottom cover 62.

[0077] As described above, referring to Figure 4 , since the output end of the driving motor 61 and the leather cup 51 are connected through a connecting component, then, when the driving motor 61 rotates, the leather cup 51 can be deformed, and then the fluid inside it is extruded to transport the fluid into the liquid outlet channel, causing the first flexible valve piece 31 of the first one-way valve 30 to deform, so that the liquid flow is led out from the liquid outlet hole 221, and the connection can connect the driving motor 61 and the cylinder block 21 on the one hand, and can define the installation space for installing the connecting component on the other hand.

[0078] In a specific embodiment, referring to Figure 4 , the connecting component includes:

[0079] A swing frame 71, the swing frame 71 is connected to one end of the leather cup 51;

[0080] A connecting shaft 72, one end of the connecting shaft 72 is connected to the middle of the swing frame 71;

[0081] An eccentric wheel 73, the eccentric wheel 73 is connected to the output end of the driving motor 61.

[0082] Since the swing frame 71 is connected to the lower end of the leather cup 51, and the eccentric wheel 73 is arranged on the output end of the driving motor 61, and the lower end of the swing frame 71 is connected to one side of the upper surface of the eccentric wheel 73, then, the driving motor 61 can drive the eccentric wheel 73 and the swing frame 71 to rotate to extrude the leather cup 51.

[0083] Referring to Figure 1, regarding the connection between the upper cover 10 and the pump body 20, it can be fixed by bolts. The bolts pass through the upper cover 10, the valve plate 22 and are fixed to the cylinder block 21. The connection method between the driving mechanism and the pump body 20, including all of them, are connection methods that have been made public and will not be elaborated here.

[0084] In addition, referring to Figure 1 and Figure 9 , between the mouths of the leather cups 51 of the liquid storage assembly 50 are connected as a whole through a flexible pad. The leather wrist 51 and the flexible pad are of an integral structure. The leather cup 51 of the liquid storage assembly 50 passes through the leather wrist mounting hole position d on the cylinder block 21, and the flexible pad is clamped in the groove e on the end face of the cylinder block 21, thereby realizing the fixation of the entire liquid storage assembly 50.

[0085] In summary, the present utility model improves the overall liquid inlet and outlet directions of the existing micro diaphragm pump, the way of adjusting the liquid pump fluid flow channel, and the directions and restraint methods of the adapted first one-way valve 30 and second one-way valve 40. Thus, the service life of the first one-way valve 30 and the second one-way valve 40 can be significantly improved. And when the leather wrist 51 deforms to conduct the liquid from the liquid outlet channel, the leather cup 51 and the liquid outlet channel remain on the same side, which can effectively reduce the loss of liquid kinetic energy, and further effectively improve the pumping performance of the diaphragm pump.

[0086] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0087] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A micro diaphragm pump, characterized in that, Comprising: An upper cover, on which a liquid inlet and a liquid outlet are provided; A pump body, including a cylinder block and a valve plate, the valve plate being connected to the upper cover; A liquid inlet passage and a liquid outlet passage are provided on the valve plate, and the liquid inlet passage and the liquid outlet passage are respectively communicated with the liquid inlet and the liquid outlet; A first one-way valve is provided on the liquid outlet passage, a second one-way valve is provided in the liquid inlet passage, the cylinder block is connected to the other side of the valve plate, and a plurality of first sealing cavities are formed between the cylinder block and the valve plate, and both the liquid inlet passage and the liquid outlet passage are communicated with the first sealing cavity; A liquid storage assembly, the liquid storage assembly includes a leather cup, and the upper ends of the leather cups are all communicated with the first sealing cavity; A driving mechanism, which is used to squeeze the leather cup and cause the leather cup to be axially deformed; Wherein, the liquid outlet passage is arranged corresponding to the axial direction of the leather cup, and the pump body and the upper cover are assembled to be able to implement the restraint and fixation of the first one-way valve and the second one-way valve.

2. The micro diaphragm pump according to claim 1, characterized in that: A plurality of groups of the leather cups are arranged along the circumferential direction of the pump body, a plurality of liquid outlet holes are provided on the valve plate, and the plurality of liquid outlet holes converge to form the liquid outlet passage, a plurality of groups of the leather cups are arranged on the liquid storage assembly and correspond to the liquid outlet holes, and the first one-way valve is arranged at the orifice position of the liquid outlet hole; A liquid inlet hole is provided at the center of the valve plate, the liquid inlet hole constitutes the liquid inlet passage, and the second one-way valve is arranged at the orifice position formed by the liquid inlet passage.

3. The micro diaphragm pump according to claim 2, wherein: The first one-way valve includes a first flexible valve sheet and a first valve rod, the first valve rod is arranged at the center position of the first flexible valve sheet, the first valve rod is fixed on the first valve plate, and the first flexible valve sheet is separated from or combined with the orifice edge of the liquid outlet hole; The second one-way valve includes a second flexible valve sheet and a second valve rod, the second valve rod is arranged at the center position of the second flexible valve sheet, the second valve rod is fixed on the valve plate, and the second flexible valve sheet is separated from or combined with the orifice edge of the liquid inlet hole.

4. The micro diaphragm pump according to claim 3, characterized in that: The liquid outlet hole is formed by enclosing a plurality of groups of unit holes, a first mounting hole is arranged among the plurality of groups of unit holes, and a first protrusion is arranged on the rod body of the first valve rod, and the first protrusion and the first mounting hole form an interference fit; The liquid inlet hole includes a plurality of groups, a second mounting hole is arranged among the plurality of groups of liquid inlet holes, and a second protrusion is arranged on the rod body of the second valve rod, and the second protrusion and the second mounting hole form an interference fit.

5. The micro diaphragm pump according to claim 3, wherein: A restraint ejector rod is provided on the upper cover, the restraint ejector rod is arranged corresponding to the position of the liquid outlet hole, and the rod end of the restraint ejector rod abuts against the outer side surface of the first flexible valve sheet of the first one-way valve.

6. The micro diaphragm pump according to claim 3, wherein: The first flexible valve sheet of the first one-way valve is installed between the valve plate and the upper cover, and the second one-way valve is installed between the cylinder block and the valve plate; The second flexible valve sheet is in sealing contact with the edge of the leather cup.

7. The micro diaphragm pump according to claim 3, characterized in that: The end face of the upper cover is provided with an annular portion, and the end face of the annular portion abuts against the valve plate to divide the inner space of the upper cover into a second sealing cavity and a third sealing cavity. Two ends of the second sealing cavity are respectively communicated with the liquid inlet and the liquid inlet channel, and two ends of the third sealing cavity are respectively communicated with the liquid outlet and the liquid outlet channel.

8. The micro diaphragm pump according to claim 1, characterized in that: The driving mechanism includes: A driving motor, the output end of the driving motor is connected with the leather cup through a connecting component; A bottom cover, one end of the bottom cover is connected with the driving motor, the other end of the bottom cover is connected with one end of the cylinder body, and the connecting component is arranged inside the bottom cover.

9. The micro diaphragm pump according to claim 8, characterized in that: The connecting component includes: A swing frame, the swing frame is connected with one end of the leather cup; A connecting shaft, one end of the connecting shaft is connected to the middle of the swing frame; An eccentric wheel, the eccentric wheel is connected with the output end of the driving motor.

10. The micro diaphragm pump according to claim 1, characterized in that: A sealing gasket is clamped between the upper cover and the valve plate.

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