CN210715028U

CN210715028U - Intermediate plate for diaphragm pump

Info

Publication number: CN210715028U
Application number: CN201921592244.8U
Authority: CN
Inventors: 李才荣
Original assignee: Guangdong Boquan Environmental Protection Technology Co Ltd
Current assignee: Guangdong Boquan Environmental Protection Technology Co Ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-06-09
Anticipated expiration: 2029-09-24

Abstract

The utility model discloses a middle plate for a diaphragm pump, wherein three working cavities are arranged at the inner side of the middle plate, and three pistons are respectively arranged in the three working cavities of the middle plate; the middle plate and the pump shell are sealed together to form a water outlet cavity in the center of the pump shell, and a water inlet cavity of the pump shell is arranged at the periphery of the water outlet cavity; the three working cavities of the middle plate are respectively provided with a suction valve and a water inlet, the suction valve shields the water inlet from the inner side, the central part of the top of the middle plate is provided with a discharge valve and a drain hole, the discharge valve shields the drain hole from the outer side, the periphery of the bottom surface of the middle plate is provided with a circle of groove, and the groove is matched with a middle plate positioning flange on the top surface of the diaphragm sheet; the top of the middle plate is provided with a circle of annular grooves, and O-shaped sealing rings are arranged in the annular grooves, so that the reliability of isolation between the water inlet cavity and the water outlet cavity is improved; the sealing structure of the triangular sealing ring with the triangular annular step combined with the square cross section is adopted on the top surface of the intermediate plate, the triangular sealing ring is made of soft rubber, ageing deformation caused by temperature and service time lengthening is not easy to occur, and the sealing reliability of the diaphragm pump is improved.

Description

Intermediate plate for diaphragm pump

Technical Field

The utility model relates to a diaphragm pump field indicates a diaphragm pump is with intermediate plate especially.

Background

The diaphragm pump depends on the eccentric angle of the eccentric wheel, and converts the rotating motion of the motor into the reciprocating motion of the piston through the tight connection among the motor shaft, the eccentric wheel, the bearing frame and the piston, thereby changing the volume of the working cavity to suck and discharge water, and the diaphragm pump depends on the eccentric angle of the eccentric wheel, and converts the rotating motion of the motor into the reciprocating motion of the piston through the tight connection among the motor shaft, the eccentric wheel, the bearing frame and the piston, thereby changing the volume of the working cavity to suck and discharge water and greatly increasing the pressure of the discharged water (about 10 to 15 KG); in order to ensure such a continuous high pressure of the working chamber of the diaphragm pump, the reliability of the internal and external sealing effect of the working chamber must be ensured.

The inner seal is the piston, the diaphragm and the seal between the bearing frame cylindrical supporting seats, the understanding of the inner seal in the prior art is not enough, the auxiliary action of the pump shell support and the piston to the sealing effect is not considered, obvious defects exist in the structural design of the pump shell support and the piston, the reliability of the inner seal is not enough, and along with the increase of the service time of the pump, the deformation of the pump shell support, the aging of the diaphragm and the like can all enable the inner seal effect to be greatly reduced.

The outer seal is the seal between the middle plate and the pump shell; the prior art is an external sealing mode, the edge of a diaphragm is usually bent inwards to form a sealing edge folding structure, and the sealing edge folding structure is sealed through rigid extrusion between the sealing edge folding structure and a pump shell, the diaphragm is usually made of harder rubber (Shore hardness is 87 degrees), a working chamber of an intermediate plate is in a higher temperature state (different from 40-80 ℃) when a pump works, the diaphragm of the structure is in the higher temperature chamber for a long time, the diaphragm is driven by a piston to do reciprocating motion, the diaphragm is easy to age and deform, the sealing effect of the sealing edge folding is poor along with the lengthening of the service time, gaps are easy to generate around the sealing edge folding, water leakage or water seepage is caused, and the service life of the pump is directly declared to be terminated in advance.

In addition, along with the higher and higher requirements of customers on the noise of the water purifier, how to reduce the noise of the pump is more and more important, the noise of the pump head part of the diaphragm pump in the existing market is generally large, but no attention is paid to or a reasonable noise reduction mode cannot be found.

Disclosure of Invention

In order to solve the problem, the utility model provides a diaphragm pump that sealing reliability is strong is with intermediate plate.

In order to achieve the above object, the utility model adopts the following technical scheme: an intermediate plate for a diaphragm pump is arranged between a diaphragm sheet and a pump shell of the diaphragm pump, three working cavities are arranged on the inner side of the intermediate plate, and three pistons are respectively arranged in the three working cavities of the intermediate plate; the middle plate and the pump shell are sealed together to form a water outlet cavity in the center of the pump shell, and a water inlet cavity of the pump shell is arranged at the periphery of the water outlet cavity; the three working cavities of the middle plate are respectively provided with a suction valve and a plurality of water inlet holes, the suction valve shields the water inlet holes from the inner side, the suction valve is a one-way valve which can only be conducted from the water inlet cavity of the pump shell to the working cavity of the middle plate in a one-way, the central part of the top of the middle plate is provided with a discharge valve and a plurality of drain holes, the discharge valve shields the drain holes from the outer side, and the discharge valve is a one-way valve which is conducted from the working cavity of the middle plate to the water outlet; the periphery of the bottom surface of the middle plate is provided with a circle of grooves, and the grooves are matched with the middle plate positioning flanges on the top surface of the diaphragm; the top of the middle plate is provided with a circle of annular groove, an O-shaped sealing ring is arranged in the annular groove, a circle of triangular annular step is arranged on the periphery of the top of the middle plate, and a triangular sealing ring is further sleeved above the triangular annular step.

Furthermore, the middle plate is in a regular triangle shape, and the three working cavities are uniformly distributed on three angular points of the regular triangle with 120-degree included angles.

Furthermore, the triangular sealing ring is made of soft rubber, and the cross section of the triangular sealing ring is square.

Furthermore, the O-shaped sealing ring is made of soft rubber, and the cross section of the O-shaped sealing ring is circular.

The beneficial effects of the utility model reside in that: the top surface of the intermediate plate of the utility model adopts the sealing structure of the triangular sealing ring with the triangular annular step combined with the square section, the triangular sealing ring is made of soft rubber, and is not easy to age and deform due to the extension of temperature and service time, thereby improving the sealing reliability of the diaphragm pump, effectively avoiding water seepage from the water inlet cavity of the pump shell to the outside, simplifying the assembly requirement and improving the working efficiency; the O-shaped sealing ring is made of soft rubber, the cross section of the O-shaped sealing ring is circular, and the annular groove is combined with the O-shaped sealing ring with the circular cross section, so that the reliability of the isolation between the water inlet cavity and the water outlet cavity is improved.

Drawings

Fig. 1 is an exploded view of the overall structure of a diaphragm pump using the intermediate plate of the present invention.

Fig. 2 is a schematic diagram of the top surface structure of the diaphragm pump using the middle plate of the present invention.

Fig. 3 is a schematic view of the bottom surface structure of a diaphragm pump using the intermediate plate of the present invention.

Fig. 4 is a schematic view of the top surface of a pump casing support of a diaphragm pump using the middle plate of the present invention.

Fig. 5 is a schematic view of the bottom surface of a piston of a diaphragm pump using the intermediate plate of the present invention.

Fig. 6 is a schematic structural view of the top surface of the middle plate of the present invention.

Fig. 7 is a schematic view of the bottom structure of the middle plate of the present invention.

Detailed Description

Referring to fig. 1-7, the diaphragm pump using the intermediate plate of the present invention includes a pump casing 1, a pump body 2, a rear end cap 21 disposed at the rear end of the pump body, a front end cap 22 disposed at the front end of the pump body, a motor (not shown) disposed inside the pump body, an eccentric wheel 28, a bearing 23, a bearing frame 24, a pump casing support 3, a diaphragm sheet 4, three pistons 5, an intermediate plate 6, an O-ring 68, and a triangular sealing ring 65; a cavity is arranged in the front end cover 22, the eccentric wheel 28 is tightly matched with the inner ring of the bearing 23, the outer ring of the bearing 23 is tightly matched with the bearing frame 24 to form a bearing frame assembly which is arranged in the cavity of the front end cover 22, the eccentric wheel 28 is connected with the output end of the motor, three cylindrical supporting seats 25 are arranged at the top of the bearing frame 24, a screw hole 251 is arranged at the top end of each cylindrical supporting seat 25, and a circle of diaphragm sealing grooves 252 are arranged at the periphery of each screw; the top of the cylindrical support seat 25 protrudes out of the top end of the front end cover 22; the pump shell support 3 is arranged at the top end of the front end cover 22, three through holes 31 are formed in the pump shell support 3, the diameter of each through hole 31 is larger than that of the cylindrical support seat 25, and the top end of the cylindrical support seat 25 penetrates out of the through hole 31; the diaphragm 4 is arranged on the top surface of the pump shell bracket 3, the diaphragm 4 is provided with three through holes 41, a circle of diaphragm sealing flange 42 is arranged on the bottom surface of the diaphragm 4 and the periphery of the through holes, the diaphragm sealing flange 42 is matched with a diaphragm annular positioning groove 252 on the cylindrical supporting seat 25, and a circle of middle plate positioning flange 43 is annularly arranged on the periphery of the top surface of the diaphragm 4; the piston 5 is arranged on the top surface of the diaphragm 4, a stepped hole 51 is arranged in the middle of the piston 5, and the piston 5 and the diaphragm 4 are fixed on the cylindrical support seat 25 through the stepped hole 51 in the middle of the piston 5, the through hole 41 in the diaphragm 4 and the screw hole 251 of the cylindrical support seat by the bolt 7; the middle plate 6 is arranged on the top surfaces of the diaphragm 4 and the pistons 5, three working cavities are arranged on the inner side of the middle plate 6, and the three pistons 5 are respectively arranged in the three working cavities of the middle plate 6; a circle of grooves 61 are formed in the periphery of the bottom surface of the middle plate 6, and the grooves 61 are matched with the middle plate positioning flanges 43 on the top surface of the diaphragm 4; a circle of triangular annular steps 64 are arranged on the periphery of the top surface of the middle plate 6, and a triangular sealing ring 65 is sleeved above the triangular annular steps 64; the top of the middle plate 6 is provided with a ring of annular groove 69, and an O-shaped sealing ring 68 is arranged in the annular groove 69; the pump shell 1 is arranged on the outer side of the middle plate 6, the pump shell 1, the pump shell bracket 3, the diaphragm 4 and the front end cover 22 are assembled into a whole through bolts 7, the number of the bolts 7 is 6, and 6 mounting holes are uniformly distributed in the pump shell 1, the pump shell bracket 3 and the front end cover 22; the middle plate 6 is sealed with the pump case 1 to form a water outlet cavity at the center of the pump case 1, the periphery of the water outlet cavity is a water inlet cavity of the pump case 1, the upper part of the pump case 1 is provided with a water inlet pipe orifice 11 and a water outlet pipe orifice 12, the water inlet pipe orifice 11 is communicated with the water inlet cavity, the water outlet pipe orifice 12 is communicated with the water outlet cavity, three working cavities of the middle plate 6 are respectively provided with a suction valve 62, the suction valve 62 is a one-way valve which can only be conducted from the water inlet cavity of the pump case 1 to the working cavity of the middle plate 6 in a one-way, the water outlet pipe orifice is communicated with the water outlet cavity of the pump case 1, the central part of the top of the middle plate 6 (namely the back of the working cavity) is provided with a discharge valve 63, the discharge valve 63 is a one-way valve which can be conducted from the working cavity of the middle plate 6 to the water outlet cavity of the pump case, the suction valve 62 is opened, and the water in the water inlet pipe orifice 11 is sucked into the working cavity of the intermediate plate 6 through the water inlet cavity of the pump shell 1; the working cavity of the middle plate 6 is also provided with a plurality of drain holes 67, the drain holes 67 are shielded by the drain valve 63 from the outside, the drain valve 63 is also made of soft rubber, when the piston 5 and the diaphragm move upwards under the driving of the motor, water in the working cavity is pressed out to the drain holes 67, the drain valve 63 is opened, and the water flows to the water outlet cavity of the pump shell 1 and completes water flow pressurization through the water outlet pipe orifice 12.

In some embodiments, the membrane sheet 4 has a thickness of 2mm and is integrally injection-molded from TPVs 201-87 (an imported soft rubber), and the membrane sheet 4 made of the material will not age, deform and cause water seepage and leakage even after long-term use.

In some embodiments, piston positioning post 44 is disposed on the top surface of diaphragm 4, and piston positioning hole 52 is disposed on the contact surface between piston 5 and diaphragm 4, so that when mounting, piston positioning post 44 is completely inserted into piston positioning hole 52 of piston 5 for mounting.

In some embodiments, two rings of annular sealing ribs 53 are arranged on the periphery of the stepped hole 51 of the piston 5 and the contact surface of the piston 5 and the diaphragm 4, and the contact surface of the piston 5 and the diaphragm 4 is arc-shaped, so that the contact area of the piston 5 and the diaphragm 4 is reduced, and the tensile strength of the diaphragm 4 and the collision noise between the piston 5 and the diaphragm 4 during the operation of the diaphragm pump are reduced.

In some embodiments, the pump casing support 3 has a thickness of 6mm around its circumference, and the pump casing support 3 has a thickness of 0.3 to 0.4mm in the central portion thereof, thereby enhancing the strength of the pump casing support 3 and enhancing the sealing effect between the diaphragm 4 and the intermediate plate 6.

In some embodiments, the triangular sealing ring 65 is made of soft rubber, is not easy to age and deform due to the increase of temperature and service time, has a square cross section, and is combined with the triangular sealing ring with the square cross section, so that the sealing reliability of the diaphragm pump is improved, and water seepage from a water inlet cavity of the pump shell to the outside is effectively avoided;

in some embodiments, the O-ring seal 68 is made of a soft rubber material with a circular cross-section, and the annular groove 69 in combination with the O-ring seal 68 with a circular cross-section improves the reliability of the isolation between the inlet chamber and the outlet chamber.

In some embodiments, three positioning protrusions 45 are disposed on the bottom surface of the diaphragm 4, and positioning concave holes 32 adapted to the positioning protrusions are disposed on the top surface of the pump casing support 3, so that the positioning protrusions 45 are inserted into the positioning concave holes 32 to be mounted in place during mounting.

In some embodiments, three pistons 5, three through holes 31 in the pump housing frame 3, three cylindrical support seats 25 at the top of the bearing frame 24, three through holes 41 in the diaphragm 4, and three working chambers of the intermediate plate 6 are uniformly distributed at an angle of 120 ° with respect to each other.

In some embodiments, the upper portion of the pump case 1 is further provided with a pressure relief mechanism, when the pressure of the water outlet cavity of the pump case 1 is too high, the pressure relief mechanism is communicated with the water inlet cavity, and the pressure relief mechanism comprises a pressure regulating valve plate 13, a spring seat 14, a pressure relief spring 15, a pressure relief cover 16 and a pressure relief cover 16, which are sequentially arranged from bottom to top, and the pressure relief cover 16 is fixed on the pump case through a bolt 7.

In some embodiments, the bottom surface of the pump body 2 is provided with a bottom plate 26, and the bottom plate 26 is provided with a plurality of shock absorbing pads 27.

In some embodiments, the water inlet nozzle 11 and the water outlet nozzle 12 may be a threaded connection interface or a direct-insertion connection interface.

The above embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by the technical solution of the present invention by those skilled in the art are all within the scope of the present invention as defined by the claims.

Claims

1. An intermediate plate for a diaphragm pump, characterized in that: the middle plate (6) is arranged between the diaphragm (4) and the pump shell (1) of the diaphragm pump, three working cavities are arranged on the inner side of the middle plate (6), and the three pistons (5) are respectively arranged in the three working cavities of the middle plate (6); the middle plate (6) and the pump shell (1) are sealed together to form a water outlet cavity in the center of the pump shell (1), and a water inlet cavity of the pump shell (1) is arranged at the periphery of the water outlet cavity; the three working cavities of the middle plate (6) are respectively provided with a suction valve (62) and a plurality of water inlet holes (66), the suction valve (62) shields the water inlet holes (66) from the inner side, the suction valve (62) is a one-way valve which can only be conducted from the water inlet cavity of the pump shell (1) to the working cavity of the middle plate (6) in a one-way, the central part of the top of the middle plate (6) is provided with a discharge valve (63) and a plurality of drain holes (67), the drain hole (67) is shielded from the outer side by the discharge valve (63), and the discharge valve (63) is a one-way valve which is conducted from the working cavity of the middle plate (6) to the water outlet cavity of the pump; a circle of grooves (61) are formed in the periphery of the bottom surface of the middle plate (6), and the grooves (61) are matched with the middle plate positioning flanges (43) on the top surface of the diaphragm (4); intermediate plate (6) top is equipped with round annular groove (69), set up O type sealing washer (68) in annular groove (69), intermediate plate (6) top surface periphery is established round triangle annular step (64), and triangle annular step (64) top still overlaps and is equipped with a triangle-shaped sealing washer (65).

2. The intermediate plate for a diaphragm pump according to claim 1, wherein: the middle plate (6) is in a regular triangle shape, and the three working cavities mutually form 120-degree included angles and are uniformly distributed on three angular points of the regular triangle.

3. The intermediate plate for a diaphragm pump according to claim 1, wherein: the triangular sealing ring (65) is made of soft rubber, and the cross section of the triangular sealing ring is square.

4. The intermediate plate for a diaphragm pump according to claim 1, wherein: the O-shaped sealing ring (68) is made of soft rubber, and the cross section of the O-shaped sealing ring is circular.