Improved structure of liquid conveying unit of diaphragm pump

Abstract

The invention relates to the technical field of diaphragm pumps, and discloses a diaphragm pump liquid conveying unit improved structure which comprises a motor assembly, a pressing plate, a partition plate, a suction cup, an umbrella valve and a first diaphragm. According to the improved structure of the liquid conveying unit of the diaphragm pump, reciprocating motion of the suction cup is achieved through the motor assembly, so that a power source is provided, air pressure changes are generated and act on an assembly composed of the partition plate, the umbrella valve, the first diaphragm and the pressing plate, the function of efficiently conveying liquid is achieved, and the umbrella valve improves the one-way sealing performance of the liquid inlet end of the diaphragm pump; and pressure building of the pressure cavity is facilitated, and liquid is stably output.

Description

Technical Field

[0001] The invention relates to the technical field of diaphragm pumps, and in particular to an improved structure of a liquid delivery unit of a diaphragm pump. Background Art

[0002] The driving mechanism and valve mechanism of conventional diaphragm pumps are separated, which makes installation inconvenient. Due to certain specific occasions, such as the urea supply pump in the SCR system of diesel engines, a liquid supply unit with compact structure and easy installation is required.

[0003] The existing diaphragm pumps are equipped with flap valves at the inlet and outlet ends to build up pressure in the inner cavity and provide power for liquid delivery. However, in actual use, especially at the inlet end, the flap valve often fails to seal tightly due to insufficient pre-tightening force on the valve port, resulting in failure of the diaphragm pump to build up pressure, affecting the effective delivery of liquid, so further optimization is needed. Summary of the invention

[0004] The object of the present invention is to provide an improved structure of a liquid delivery unit of a diaphragm pump to solve the problems mentioned in the above background technology and ensure the delivery function of the diaphragm pump.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An improved structure of a diaphragm pump liquid delivery unit includes a motor assembly, a pressure plate, a partition, a suction cup, an umbrella valve and a first diaphragm, wherein:

[0007] The output end housing of the motor assembly is connected to the pressing plate to form an inner cavity;

[0008] The pressing plate is provided with a liquid inlet and a liquid outlet for connecting the inner cavity with the outside;

[0009] The partition is arranged in the inner cavity, and is provided with a first flow channel hole communicating with the liquid inlet and a second flow channel hole communicating with the liquid outlet, the first flow channel hole is provided with a first convex edge at the opening close to the suction cup, and the second flow channel hole is provided with a second convex edge at the opening close to the pressure plate;

[0010] The outer edge of the suction cup is clamped between the output end housing of the motor assembly and the partition, and the suction cup is driven by the motor assembly to approach or move away from the partition, so that a pressure chamber is formed between the suction cup and the partition, and the first flow channel hole and the second flow channel hole are respectively connected to the pressure chamber;

[0011] The umbrella valve is arranged in the first flow channel hole and cooperates with the first convex edge, so as to form a one-way seal for the liquid inlet;

[0012] The first diaphragm is disposed in the second flow channel hole and cooperates with the second protrusion to form a one-way seal for the liquid outlet.

[0013] As an optional solution, the umbrella valve includes a valve stem and a valve cover arranged at the end of the valve stem, the valve stem is inserted into the first flow channel hole, the valve cover is arranged in the pressure chamber, and the outer ring of the valve cover is provided with a convex ring, which abuts against the surface of the partition and is located on the outer ring of the first convex edge.

[0014] As an optional solution, the first flow channel hole includes a center hole and a plurality of first through holes evenly distributed around the circumference of the center hole, the first convex edge is arranged around all the first through holes, the center hole is interference fit with the valve stem, and the first through holes are used for liquid to pass through.

[0015] As an optional solution, a protrusion is provided on the hole wall of the central hole, and a recessed portion cooperating with the protrusion is provided on the valve stem.

[0016] As an optional solution, a disc portion for closing the second flow channel hole is provided on the first diaphragm, and a second through hole for liquid to pass through is provided on the outer ring of the disc portion.

[0017] As an optional solution, a cross rib is provided in the second flow channel hole for limiting one side of the first diaphragm, and a limiting column is provided in the liquid outlet for limiting the other side of the first diaphragm.

[0018] As an optional solution, a buffer cavity is arranged on the surface of the pressure plate that abuts against the partition plate, the liquid inlet is connected to the buffer cavity, and a second diaphragm for closing the buffer cavity is arranged between the pressure plate and the partition plate.

[0019] As an optional solution, the second diaphragm is provided with a convex column abutting against the surface of the pressure plate, and the pressure plate is provided with a groove limiting the convex column.

[0020] As an optional solution, the second diaphragm and the first diaphragm are an integrated membrane, and an avoidance hole that does not affect the connection between the liquid inlet and the first flow channel hole is opened on the integrated membrane.

[0021] As an optional solution, the motor of the motor assembly is any one of a brushless motor, a brushed motor, an outer rotor motor, an inner rotor motor, a DC motor, and an AC motor.

[0022] Beneficial effects of the present invention:

[0023] The improved structure of the diaphragm pump liquid delivery unit realizes the reciprocating motion of the suction cup through the motor assembly, thereby providing a power source, generating air pressure changes, and acting on the assembly consisting of the partition, umbrella valve, first diaphragm, and pressure plate to achieve the function of efficient liquid delivery. The umbrella valve improves the one-way sealing of the liquid inlet end of the diaphragm pump, which is more conducive to pressure building in the pressure chamber, so that the liquid can be output stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of an improved structure of a diaphragm pump liquid delivery unit provided by an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 is a schematic structural diagram of an umbrella valve involved in an embodiment of the present invention;

[0027] Figure 4 is a first perspective view of a partition involved in an embodiment of the present invention;

[0028] Figure 5 is a second viewing angle diagram of the partition involved in the embodiment of the present invention;

[0029] Figure 6 is a schematic structural diagram of an integrated membrane involved in an embodiment of the present invention;

[0030] Figure 7 It is a schematic structural diagram of a pressing plate involved in an embodiment of the present invention.

[0031] In the attached figure:

[0032] 1. Motor assembly;

[0033] 2. Pressing plate; 21. Liquid inlet; 22. Liquid outlet; 23. Limiting column; 24. Buffer cavity; 25. Groove;

[0034] 3. partition; 31. first flow channel hole; 311. center hole; 312. first through hole; 32. second flow channel hole; 33. first convex edge; 34. second convex edge; 35. raised portion; 36. cross rib;

[0035] 4. Suction cup;

[0036] 5. umbrella valve; 51. valve stem; 52. valve cover; 53. convex ring; 54. recessed portion;

[0037] 6. first diaphragm; 61. disc portion; 62. second through hole;

[0038] 7. Pressure chamber;

[0039] 8. second diaphragm; 81. convex column;

[0040] 9. Avoidance hole. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0042] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] 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 below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, 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 should not be understood as a limitation on the present invention.

[0045] In addition, the terms "first", "second", etc. are merely used to distinguish in description and have no special meanings.

[0046] See also Figures 1 to 7 As shown, this embodiment provides an improved structure of a diaphragm pump liquid delivery unit, including a motor assembly 1, a pressure plate 2, a partition 3, a suction cup 4, an umbrella valve 5 and a first diaphragm 6, wherein:

[0047] The output end housing of the motor assembly 1 is connected to the pressing plate 2 to form an inner cavity;

[0048] The pressing plate 2 is provided with a liquid inlet 21 and a liquid outlet 22 for connecting the inner cavity with the outside;

[0049] The partition plate 3 is arranged in the inner cavity, and is provided with a first flow channel hole 31 communicating with the liquid inlet 21 and a second flow channel hole 32 communicating with the liquid outlet 22. The opening of the first flow channel hole 31 close to the suction cup 4 is provided with a first convex edge 33, and the opening of the second flow channel hole 32 close to the pressing plate 2 is provided with a second convex edge 34.

[0050] The outer edge of the suction cup 4 is sandwiched between the output end housing of the motor assembly 1 and the partition 3, and the suction cup 4 is driven by the motor assembly 1 to approach or move away from the partition 3, so that a pressure chamber 7 is formed between the suction cup 4 and the partition 3, and the first flow channel hole 31 and the second flow channel hole 32 are respectively connected to the pressure chamber 7;

[0051] The umbrella valve 5 is disposed in the first flow channel hole 31 and cooperates with the first convex edge 33 to form a one-way seal for the liquid inlet 21;

[0052] The first diaphragm 6 is disposed in the second flow channel hole 32 and cooperates with the second protrusion 34 , thereby forming a one-way seal for the liquid outlet 22 .

[0053] Thus, the reciprocating motion of the suction cup 4 is realized through the motor assembly 1, thereby providing a power source, generating air pressure changes, and acting on the assembly consisting of the partition 3, the umbrella valve 5, the first diaphragm 6, and the pressure plate 2, thereby realizing the function of efficient liquid transportation. The umbrella valve 5 improves the one-way sealing of the liquid inlet end of the diaphragm pump, which is more conducive to the pressure building of the pressure chamber 7, so that the liquid is output stably.

[0054] Optionally, see Figure 2 and Figure 3 The umbrella valve 5 includes a valve stem 51 and a valve cover 52 arranged at the end of the valve stem 51, the valve stem 51 is inserted into the first flow channel hole 31, the valve cover 52 is arranged in the pressure chamber 7, and a convex ring 53 is arranged on the outer ring of the valve cover 52, the convex ring 53 abuts against the surface of the partition plate 3 and is located on the outer ring of the first convex edge 33.

[0055] Therefore, the valve stem 51 ensures that the umbrella valve 5 is reliably installed, and the valve cover 52 ensures that the umbrella valve 5 reliably unidirectionally seals the first flow channel hole 31 .

[0056] Considering that the first flow channel hole 31 needs to be installed with the umbrella valve 5 and has the requirement of liquid passage, which easily affects the installation of the umbrella valve 5, it is necessary to optimize the structure of the first flow channel hole 31. Figure 4 and Figure 5 The first flow channel hole 31 includes a center hole 311 and a plurality of first through holes 312 evenly distributed around the circumference of the center hole 311. The first convex edge 33 is arranged around all the first through holes 312. The center hole 311 is interference fit with the valve stem 51. The first through holes 312 are used for liquid to pass through.

[0057] Furthermore, a protrusion 35 is provided on the hole wall of the central hole 311 , and a recess 54 cooperating with the protrusion 35 is provided on the valve stem 51 .

[0058] Therefore, the central hole 311 is interference-fitted with the valve stem 51 and is only used to fix the umbrella valve 5 , while the first through hole 312 is used to allow liquid to pass through, and the two do not affect each other, thereby ensuring the installation stability and functionality of the umbrella valve 5 .

[0059] Optionally, see Figure 1 , Figures 5 to 7 The first diaphragm 6 is provided with a disc portion 61 for closing the second flow channel hole 32, and the outer ring of the disc portion 61 is provided with a second through hole 62 for liquid to pass through.

[0060] Furthermore, a cross rib 36 for limiting one side of the first diaphragm 6 is provided in the second flow channel hole 32 , and a limiting column 23 for limiting the other side of the first diaphragm 6 is provided in the liquid outlet 22 .

[0061] Thus, while ensuring the one-way sealing function of the first diaphragm 6 , the first diaphragm 6 is prevented from blocking the second flow channel hole 32 due to abnormal position.

[0062] Optionally, see Figure 1 , Figure 6 and Figure 7 A buffer cavity 24 is arranged on the surface of the pressing plate 2 that is close to the partition plate 3 , the liquid inlet 21 is connected to the buffer cavity 24 , and a second diaphragm 8 for closing the buffer cavity 24 is arranged between the pressing plate 2 and the partition plate 3 .

[0063] Furthermore, the second diaphragm 8 is provided with a convex column 81 which abuts against the surface of the pressing plate 2 , and the pressing plate 2 is provided with a groove 25 which limits the convex column 81 .

[0064] Thus, the position accuracy of the second diaphragm 8 is ensured, and its function is not affected by position abnormality.

[0065] Optionally, the second diaphragm 8 and the first diaphragm 6 are an integral membrane, and a avoidance hole 9 which does not affect the communication between the liquid inlet 21 and the first flow channel hole 31 is opened on the integral membrane.

[0066] Optionally, the motor of the motor assembly 1 may be any one of a brushless motor, a brushed motor, an outer rotor motor, an inner rotor motor, a DC motor, and an AC motor.

[0067] Specific delivery process:

[0068] When the motor assembly 1 drives the suction cup 4 to move so that the volume of the pressure chamber 7 expands, the disc portion 61 of the first diaphragm 6 forms a seal with the second convex edge 34 of the partition 3 under the action of pressure, and the valve cover 52 of the umbrella valve 5 does not form a seal with the first convex edge 33 of the partition 3, and the liquid is sucked into the pressure chamber 7 from the liquid inlet 21;

[0069] When the motor assembly 1 drives the suction cup 4 to move so that the volume of the pressure chamber 7 is compressed, the valve cover 52 of the umbrella valve 5 forms a seal with the first convex edge 33 of the partition 3, and the disc portion 61 of the first diaphragm 6 does not form a seal with the second convex edge 34 of the partition 3 under the action of pressure, and the liquid in the pressure chamber 7 is discharged from the liquid outlet 22;

[0070] In this alternating reciprocating manner, the liquid is input from the liquid inlet 21 and output from the liquid outlet 22 under the action of pressure, thereby achieving continuous transportation.

[0071] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The improved structure of the diaphragm pump liquid delivery unit is characterized in that: It comprises a motor assembly (1), a pressure plate (2), a partition (3), a suction cup (4), an umbrella valve (5) and a first diaphragm (6), wherein: The output end housing of the motor assembly (1) is connected to the pressure plate (2) to form an inner cavity; The pressing plate (2) is provided with a liquid inlet (21) and a liquid outlet (22) for connecting the inner cavity with the outside; The partition plate (3) is arranged in the inner cavity, and is provided with a first flow channel hole (31) communicating with the liquid inlet (21) and a second flow channel hole (32) communicating with the liquid outlet (22); a first convex edge (33) is provided at an opening of the first flow channel hole (31) close to the suction cup (4), and a second convex edge (34) is provided at an opening of the second flow channel hole (32) close to the pressure plate (2); The outer edge of the suction cup (4) is sandwiched between the output end housing of the motor assembly (1) and the partition (3), and the suction cup (4) is driven by the motor assembly (1) to approach or move away from the partition (3), so that a pressure chamber (7) is formed between the suction cup (4) and the partition (3), and the first flow channel hole (31) and the second flow channel hole (32) are respectively connected to the pressure chamber (7); The umbrella valve (5) is arranged in the first flow channel hole (31) and cooperates with the first convex edge (33), thereby forming a one-way seal for the liquid inlet (21); The first diaphragm (6) is arranged in the second flow channel hole (32) and cooperates with the second protrusion (34), thereby forming a one-way seal for the liquid outlet (22).

2. The improved structure of the diaphragm pump liquid delivery unit according to claim 1, characterized in that: The umbrella valve (5) comprises a valve stem (51) and a valve cover (52) arranged at the end of the valve stem (51); the valve stem (51) is inserted into the first flow channel hole (31); the valve cover (52) is arranged in the pressure chamber (7); a convex ring (53) is arranged on the outer ring of the valve cover (52); the convex ring (53) abuts against the surface of the partition (3) and is located on the outer ring of the first convex edge (33).

3. The improved structure of the diaphragm pump liquid delivery unit according to claim 2, characterized in that: The first flow channel hole (31) comprises a central hole (311) and a plurality of first through holes (312) uniformly distributed around the circumference of the central hole (311); the first convex edge (33) is arranged around all the first through holes (312); the central hole (311) is interference fit with the valve stem (51); and the first through holes (312) are used for allowing liquid to pass through.

4. The improved structure of the diaphragm pump liquid delivery unit according to claim 3, characterized in that: A protrusion (35) is provided on the hole wall of the central hole (311), and a recess (54) cooperating with the protrusion (35) is provided on the valve stem (51).

5. The improved structure of the diaphragm pump liquid delivery unit according to claim 1, characterized in that: The first diaphragm (6) is provided with a disc portion (61) for closing the second flow channel hole (32), and the outer ring of the disc portion (61) is provided with a second through hole (62) for liquid to pass through.

6. The improved structure of the diaphragm pump liquid delivery unit according to claim 5, characterized in that: A cross rib (36) is provided in the second flow channel hole (32) for limiting one side of the first diaphragm (6), and a limiting column (23) is provided in the liquid outlet (22) for limiting the other side of the first diaphragm (6).

7. The improved structure of the diaphragm pump liquid delivery unit according to claim 1, characterized in that: A buffer cavity (24) is arranged on the surface of the pressure plate (2) abutting against the partition plate (3); the liquid inlet (21) is connected to the buffer cavity (24); and a second diaphragm (8) for closing the buffer cavity (24) is arranged between the pressure plate (2) and the partition plate (3).

8. The improved structure of the diaphragm pump liquid delivery unit according to claim 7, characterized in that: The second diaphragm (8) is provided with a convex column (81) that abuts against the surface of the pressure plate (2), and the pressure plate (2) is provided with a groove (25) that limits the convex column (81).

9. The improved structure of the diaphragm pump liquid delivery unit according to claim 7, characterized in that: The second diaphragm (8) and the first diaphragm (6) are an integral membrane, and a avoidance hole (9) is provided on the integral membrane so as not to affect the connection between the liquid inlet (21) and the first flow channel hole (31).

10. The improved structure of the diaphragm pump liquid delivery unit according to claim 1, characterized in that: The motor of the motor assembly (1) is any one of a brushless motor, a brushed motor, an outer rotor motor, an inner rotor motor, a DC motor, and an AC motor.

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