CN217380832U - Three-cavity pressure relief reverse osmosis diaphragm pump with flat-head fluid chamber - Google Patents

Abstract

The utility model discloses a flat head fluid chamber three-cavity pressure relief reverse osmosis diaphragm pump, which comprises a fluid chamber, a diaphragm body, an aluminum support frame and a motor shell; the diaphragm chamber and the fluid chamber are matched to form a high-pressure cavity for communicating the water outlet and a low-pressure cavity for communicating the water inlet; the top surface of the fluid chamber is a circular flat top surface, a pressure regulating valve cavity is processed in the center of the flat top surface, and the pressure regulating valve cavity, the diaphragm chamber, the diaphragm body and the motor shell have the same axis; the pressure regulating valve cavity is internally provided with a pressure regulating component. Three suction check cavities are formed in the bottom surface of the diaphragm chamber, and a discharge check cavity is formed in the center of the top ring of the diaphragm chamber; the suction non-return cavity is provided with water suction pore channels, the discharge non-return cavity is formed with three drainage pore channel groups which are correspondingly communicated with the corresponding suction non-return cavity, and each drainage pore channel group consists of a plurality of drainage pore channels. The utility model discloses energy loss is little, energy-concerving and environment-protective to the fluid room adopts the crew cut design, can effectively prevent pressure regulating subassembly damage.

Description

Three-cavity pressure relief reverse osmosis diaphragm pump with flat-head fluid chamber

Technical Field

The utility model relates to a diaphragm pump technique for the water purifier, especially a three chamber pressure release reverse osmosis diaphragm pump in crew cut fluid chamber.

Background

At present, the water purifier is very popular for both household and commercial use, and the performance requirements of consumers on the water purifier are higher and higher. The reverse osmosis membrane pump is one of the main components installed in a water purifier, and serves to pressurize low-pressure raw water to provide high-pressure water and to prevent the pressurized high-pressure water from flowing back in reverse. All can have a pressure regulating subassembly installation cavity in the position department of skew top surface center on the top surface of the fluid room of traditional reverse osmosis diaphragm pump to install the pressure regulating subassembly that is used for adjusting diaphragm pump water pressure size in this pressure regulating subassembly installation cavity. After the pressure regulating assembly is installed in the fluid chamber with the eccentric structure, the pressure regulating assembly protrudes out of the top surface of the fluid chamber and is high, so that the danger that the pressure regulating assembly is collided is increased.

Disclosure of Invention

The utility model aims to solve the technical problem to the current situation of above-mentioned prior art, and provide a three chamber pressure release reverse osmosis diaphragm pumps of crew cut fluid chamber, this reverse osmosis diaphragm pump energy loss is little, energy-concerving and environment-protective to can prevent that the pressure regulating subassembly from damaging.

The utility model provides a technical scheme that above-mentioned technical problem adopted does:

a flat-head fluid chamber three-cavity pressure relief reverse osmosis diaphragm pump comprises a fluid chamber, an aluminum support frame and a motor shell which are sequentially assembled from top to bottom; a diaphragm chamber and a diaphragm body are sequentially pressed between the fluid chamber and the aluminum support frame; the diaphragm chamber and the fluid chamber are matched to form a high-pressure cavity and a low-pressure cavity which are mutually independent; the low-pressure cavity is communicated with the water inlet of the fluid chamber, and the high-pressure cavity is communicated with the water outlet of the fluid chamber; the top surface of the fluid chamber is a circular flat top surface, a pressure regulating valve cavity is processed in the center of the flat top surface, and the pressure regulating valve cavity, the diaphragm chamber, the diaphragm body and the motor shell have the same axis; the pressure regulating valve cavity is internally provided with a pressure regulating component for controlling the water pressure, and the pressure regulating component comprises a pressure regulating spring, a spring base and a pressure regulating valve which are sequentially pressed in the pressure regulating valve cavity through a small top cover; the horizontal plane of the upper surface of the small top cover is slightly lower than the horizontal plane of the flat top surface of the fluid chamber, or the horizontal plane of the upper surface of the small top cover is level with the horizontal plane of the flat top surface of the fluid chamber; three suction non-return cavities forming a three-cavity diaphragm chamber are formed on the bottom surface of the diaphragm chamber, and a discharge non-return cavity surrounded by an annular upper surrounding edge is formed in the center of a top ring of the diaphragm chamber; and the suction non-return cavity is internally provided with water absorption pore channels for communicating the suction non-return cavity with the low-pressure cavity, three drainage pore channel groups for correspondingly communicating with the corresponding suction non-return cavity are formed in the drainage non-return cavity, and each drainage pore channel group consists of a plurality of drainage pore channels.

In order to optimize the technical scheme, the specific measures adopted further comprise:

a convex ring which is used for being in sealing press fit with the upper peripheral edge of the diaphragm chamber is formed in the fluid chamber, and an O-shaped ring which plays a role in sealing is press fit between the convex ring and the upper peripheral edge; the high-pressure cavity is formed by a space surrounded by the upper convex surrounding edge and the convex ring.

The suction check valve comprises a suction valve plate and a suction valve rod, wherein the suction valve plate is used for being matched with the water suction pore channel in a sealing mode, the suction valve rod is connected to the center of the suction valve plate, and a mounting hole for inserting and assembling the suction valve rod is formed in the center of the suction check cavity.

The discharge check valve comprises a discharge valve plate and a discharge valve rod, wherein the discharge valve plate is used for being matched with the drainage hole channel in a sealing mode, the discharge valve rod is connected to the center of the discharge valve plate, and an assembly hole used for enabling the discharge valve rod to be inserted and assembled is formed in the center of the discharge check cavity.

Three grooves for dividing the three groups of drainage pore passages are formed in the discharge check cavity, and a dividing strip for sealing, inserting and matching with the grooves is formed on the bottom surface of the discharge valve plate.

Three mutually independent sealing areas are formed on the diaphragm body, and three mutually independent pump chambers are formed by the three sealing areas and the three suction check cavities in a one-to-one correspondence manner; an annular clamping groove for mounting the piston sheet is formed in the sealing area, and an inserting convex ring for clamping into the clamping groove is formed in the piston sheet.

The motor shell consists of a cylindrical shell, a front end cover and a rear end cover; the front end cover is fixedly arranged on the front port of the shell, and the rear end cover is fixedly arranged on the rear port of the shell; two carbon brush sliding cavities used for installing the carbon brushes in a sliding mode are formed in the rear end cover, the distance between the two carbon brush sliding cavities is 180 degrees in the circumferential direction, each carbon brush sliding cavity is provided with a carbon brush clamp used for clamping the carbon brushes, the rear end cover is provided with a lead notch used for leading out a power line, and an outgoing line protective sleeve is clamped in the lead notch.

The aluminum support frame is fixedly connected with the front end cover of the motor shell, a piston frame assembly cavity is formed between the aluminum support frame and the front end cover, a piston frame which pushes piston sheets fixed on the diaphragm body to move in a track manner through swinging is arranged in the piston frame assembly cavity, and a convex body which is used for being in abutting contact with the piston sheets and matched with the piston sheets is formed on the piston frame at the position corresponding to each piston sheet.

The shaping has the location cavity that is used for with little top cap location fit on the flush top surface of above-mentioned fluid chamber, and the radian shaping has four screw holes in the location cavity, and the shaping has four counter bores that supply the screw to wear to establish on the top surface of little top cap, and the bottom surface shaping of little top cap has the annular location chamber that is used for with pressure regulating spring's upper end location suit complex.

The small top cover is sleeved and pressed with a top cover sealing ring for sealing, and a triangular sealing ring is pressed between the fluid chamber and the aluminum supporting frame.

Compared with the prior art, the utility model discloses be circular shape plano face with the top surface shaping of fluid room to there is the pressure regulating valve chamber at the central shaping of plano face, install the pressure regulating subassembly that is used for controlling water pressure size in the pressure regulating valve chamber, the horizontal plane that the upper surface of the little top cap of pressure regulating subassembly was located after the pressure regulating subassembly installation slightly hangs down the horizontal plane that the plano face of fluid room was located, or the horizontal plane that the upper surface of the little top cap was located and the horizontal plane that the plano face of fluid room was located keep equal mutually. The utility model discloses the top surface of fluid room adopts the flat top structure, and the pressure regulating subassembly is located the pressure regulating valve pocket of fluid room completely, therefore this kind of fluid room not only can prevent that the pressure regulating subassembly from damaging, but also makes the diaphragm pump outward appearance cleaner and tidier. The pressure regulating valve cavity, the diaphragm chamber, the diaphragm body and the motor shell are coaxially arranged, so that the assembly structure of each part is simpler, and the forming process of the pressure regulating valve cavity on the fluid chamber is easier. The utility model discloses a diaphragm chamber bottom surface shaping is three inhales non return chamber, has formed the diaphragm chamber of three cavity structures, and the diaphragm chamber of three cavity structures can reduce the loss of every periodic motion of motor to it is energy-concerving and environment-protective more.

Drawings

FIG. 1 is a cross-sectional structural view of the present invention;

FIG. 2 is a schematic view of the exploded structure of the present invention;

FIG. 3 is a schematic view of the assembly of a fluid chamber and a diaphragm chamber according to the present invention;

figure 4 is a top view of a fluid chamber of the present invention;

FIG. 5 is a left side view of FIG. 4;

fig. 6 is a top view of a diaphragm chamber of the present invention;

FIG. 7 is a left side view of FIG. 6;

FIG. 8 is a top view of the membrane body of the present invention;

FIG. 9 is a left side view of FIG. 8;

fig. 10 is a top view of the rear end cap of the present invention;

FIG. 11 is a left side view of FIG. 10;

fig. 12 is a top view of the small top cap of the present invention;

FIG. 13 is a left side view of FIG. 12;

FIG. 14 is a schematic view of the discharge check valve of the present invention;

fig. 15 is a schematic structural view of the suction check valve of the present invention.

Detailed Description

Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

Fig. 1 to 15 are structural schematic diagrams of the present invention.

Wherein the reference numerals are: o-shaped ring F, a piston frame assembly cavity H, a water suction hole channel K1, a water drainage hole channel K2, a triangular sealing ring M, a low-pressure cavity Q1, a high-pressure cavity Q2, a pump chamber S, a fluid chamber 1, a water inlet 1a, a water outlet 1b, a pressure regulating valve cavity 1c, a positioning concave cavity 1d, a threaded hole 1e, a convex ring 11, an aluminum support frame 2, a diaphragm chamber 3, a mounting hole 3a, a mounting hole 3b, a groove 3c, an upper surrounding edge 31, a discharge check cavity 32, a diaphragm body 4, a sealing area 41, a clamping groove 42, a pressure regulating valve group 5, a small top cover 51, a countersunk hole 511, an annular positioning cavity 512, a spring base 52, a pressure regulating valve 53, a top cover sealing ring 54, a suction check valve 61, a suction valve plate 611, a suction valve rod 612, a discharge check valve plate 62, a discharge valve plate 621, a discharge valve rod 622, a dividing strip 623, a piston plate 7, a plug-in convex ring 71, a piston frame 8, a convex body 81, a motor shell 9, a machine shell 91, a machine shell, The carbon brush type lead wire protection device comprises a front end cover 92, a rear end cover 93, a carbon brush sliding cavity 931, a lead wire gap 932, a carbon brush clamp 94 and a lead wire protection sleeve 95.

As shown in fig. 1 to 15, the utility model discloses a three-chamber pressure relief reverse osmosis diaphragm pump of flat head fluid chamber, which comprises a fluid chamber 1, an aluminum support frame 2 and a motor housing 9 from top to bottom in turn. The fluid chamber 1, the aluminum support frame 2 and the motor shell 9 are fastened and connected into a whole through bolts. A diaphragm chamber 3 and a diaphragm body 4 are sequentially sealed and pressed between the fluid chamber 1 and the aluminum support frame 2. As best seen in fig. 3, the diaphragm chamber 3 and the fluid chamber 1 cooperate to define two separate chambers, including a centrally located high pressure chamber Q2 and a low pressure chamber Q1 surrounding the high pressure chamber Q2. A water inlet 1a and a water outlet 1b are formed on the fluid chamber 1 at a distance of 180 degrees in the circumferential direction, a high-pressure cavity Q2 is communicated with the water outlet 1b, and a low-pressure cavity Q1 is communicated with the water inlet 1 a.

The utility model discloses a focus lies in: the top surface of the fluid chamber 1 is processed into a round flat top surface, the center of the flat top surface is processed with a pressure regulating valve cavity 1c extending downwards, and the pressure regulating valve cavity 1c, the diaphragm chamber 3, the diaphragm body 4 and the motor shell 9 have the same axis. The pressure regulating assembly 5 is installed in the pressure regulating valve cavity, a drainage channel for communicating the high-pressure cavity Q2 with the water outlet 1b is formed in the fluid chamber 1, and the pressure regulating assembly 5 regulates the drainage pressure of the diaphragm pump by controlling the opening degree of a throat opening of the drainage channel. The pressure regulating assembly 5 of the present invention comprises a small top cap 51, a pressure regulating spring (not shown in the figure), a spring base 52 and a pressure regulating valve 53. The pressure regulating spring, the spring base 52 and the pressure regulating valve 53 are sequentially pressed in the pressure regulating valve cavity through the small top cover 51. The utility model discloses after the installation of pressure regulating subassembly 5, the horizontal plane that the upper surface of little top cap 51 was located keeps level mutually with the horizontal plane that the plano-top face of fluid chamber 1 was located, perhaps the horizontal plane that the upper surface of little top cap 51 was located slightly hangs down the horizontal plane that the plano-top face of fluid chamber 1 was located. In order to further facilitate the installation of the pressure regulating assembly 5, a positioning concave cavity 1d for positioning and matching with the small top cover 51 is processed on the flat top surface of the fluid chamber 1, and the positioning concave cavity 1d is formed by expanding the diameter of the upper end part of the pressure regulating valve cavity 1 c. As shown in fig. 4, the positioning cavity 1d is formed with four threaded holes 1e at medium radian, and the threaded holes 1e are used for being tightly matched with screws. As shown in fig. 12, four countersunk holes 511 are formed on the top surface of the small top cover 51, and screws can be screwed through the countersunk holes 511 and the threaded holes 1e to tightly mount the small top cover 51 in the positioning cavity 1 d. In order to prevent the pressure regulating spring from moving radially, as can be seen from fig. 4, the bottom surface of the small top cover 51 is formed with an annular positioning cavity 512 for fitting with the upper end positioning sleeve of the pressure regulating spring. The utility model discloses the bottom surface shaping of diaphragm chamber 3 has the three non return chamber that inhales that constitutes three cavity construction diaphragm chambers, can see out from figure 6 and figure 7, inhales the non return chamber and makes progress the arc arch to the three non return chamber that inhales is isosceles triangle and distributes. A discharge check cavity 32 is formed in the center of the top ring of the diaphragm chamber 3, and the discharge check cavity 32 is formed by a space surrounded by an annular upper peripheral edge 31 on the diaphragm chamber 3. Each of the suction check chambers is opened therein with a plurality of water suction ports K1, and the water suction port K1 is used to communicate the suction check chamber with the low pressure chamber Q1, so that raw water introduced into the low pressure chamber Q1 from the water inlet 1a can be sucked into the suction check chamber. Three sets of drainage holes are opened in the discharge check chamber 32, each set of drainage holes consisting of a plurality of drainage holes K2. The three drainage channel groups are communicated with the three suction check cavities in a one-to-one correspondence manner, and raw water sucked into the check cavities can be pressurized and discharged into the discharge check cavity 32 through the drainage channels. As can be seen from FIG. 6, the plurality of water absorbing ports K1 are arranged in a semi-circular shape, and the plurality of water discharge ports K2 are arranged in an arc shape.

In the embodiment shown in fig. 3, the fluid chamber 1 of the present invention is formed with a downwardly extending annular protrusion 11, and the annular protrusion 11 is fitted with the diaphragm chamber 3 by sealing and press-fitting with the upper peripheral edge 31 of the diaphragm chamber 3. In order to ensure the tightness of the connection between the two, a sealing O-ring F is pressed between the convex ring 11 and the upper peripheral edge 31. The high pressure chamber Q2 of the present invention is formed by the space surrounded by the upper surrounding edge 31 and the protruding ring 11, that is, the discharge check chamber 32 is a part of the high pressure chamber Q2. The low pressure chamber Q1 of the present invention is composed of the space surrounded by the convex ring 11 and the upper convex surrounding edge 31.

In the embodiment, the suction check valve 61 is disposed in the suction check chamber, and the suction check valve 61 is used to make water flow in one direction, so as to prevent the raw water sucked into the suction check valve 61 from returning to the low pressure chamber Q1. As shown in fig. 15 and 13, the suction check valve 61 includes a suction valve plate 611 for sealingly fitting to the suction port K1 and a suction valve stem 612 attached to the center of the suction valve plate 611, and the center in the suction check chamber is formed with a mounting hole 3a for insertion fitting of the suction valve stem 612.

In the embodiment of the present invention, the discharge check valve 62 is disposed in the discharge check chamber 32, and the discharge check valve 62 is used to prevent the water discharged into the discharge check chamber 32 from returning to the suction check chamber. As shown in fig. 14, the discharge check valve 62 includes a discharge valve plate 621 and a discharge valve stem 622 connected to the center of the discharge valve plate 621, and the discharge valve plate 621 is configured to sealingly fit with the discharge hole K2 for the purpose of one-way water flow. A fitting hole 3b for insertion fitting of the discharge valve stem 622 is formed centrally in the discharge check cavity 32.

In the embodiment, as shown in fig. 6, three grooves 3c for dividing the three sets of the drainage hole sets are formed in the discharge check cavity 32, and a dividing strip 623 for sealing and inserting-fitting with the grooves 3c is formed on the bottom surface of the discharge valve sheet 621.

In the embodiment, as shown in fig. 8 and 9, the membrane body 4 of the present invention is formed with three mutually independent sealing regions 41, a dividing rib is formed between two adjacent sealing regions 41, and three mutually independent pump chambers S are formed by the three sealing regions 41 and three suction check cavities in a one-to-one correspondence. An annular groove 42 for receiving the piston plate 7 is formed in the sealing region 41, and the piston plate 7 is formed with a plug-in collar 71 for snapping into the groove 42. The piston plate 7 generates a pressure difference in the pump chamber S by its movement, and continuously pumps the raw water into the high-pressure chamber Q2 through the pump chamber S.

In the embodiment shown in fig. 1 and 2, the motor housing 9 of the present invention is composed of a cylindrical casing 91, a front end cap 92 and a rear end cap 93; the front end cover 92 is fixedly installed on the front end port of the casing 91, and the rear end cover 93 is fixedly installed on the rear end port of the casing 91; two carbon brush sliding cavities 931 for slidably mounting carbon brushes are formed in the rear end cover 93, and the two carbon brush sliding cavities 931 are spaced by 180 degrees in the circumferential direction of the rear end cover 93. Each carbon brush sliding cavity 931 is provided with a carbon brush clip 94 for clamping a carbon brush, the rear end cover 93 is provided with a lead notch 932 for leading out a power line, and the lead notch 932 is clamped with a lead-out protective sleeve 95.

In the embodiment shown in fig. 1, an aluminum support frame 2 is fixedly connected with a front end cover 92 of the motor housing 9, and a piston frame assembly cavity H is formed between the aluminum support frame 2 and the front end cover 92. The piston frame assembly cavity H is internally provided with a piston frame 8 which pushes the piston sheet 7 fixed on the diaphragm body 4 to do track motion through swinging, and a convex body 81 which is used for being in contact fit with the piston sheet 7 is formed at the position corresponding to each piston sheet 7 on the piston frame 8.

In the embodiment, a top cover sealing ring 54 for sealing is sleeved and pressed on the small top cover 51, and a triangular sealing ring M is pressed between the fluid chamber 1 and the aluminum support frame 2.

The utility model discloses a theory of operation is: the motor (not shown in the figure) arranged in the motor shell 9 converts electric energy into mechanical energy, the motor drives the eccentric balance wheel (not shown in the figure) at the front end of the motor to do regular motion, the eccentric balance wheel drives the piston frame 8, the piston sheet 7 fixed on the diaphragm body 4 is pushed by the piston frame 8 to do track motion, the track motion of the piston sheet 7 enables a pump chamber formed by the suction check cavity of the diaphragm chamber 3 to form air pressure difference, and the air pressure difference enables raw water entering the pump body to continuously enter the suction check cavity through the low-pressure cavity Q1 and the water suction pore channel K1. The raw water is pressurized in the suction check cavity and then is discharged from the water outlet 1b through the water discharge pore channel K2, the discharge check cavity 32 and the high pressure cavity Q2. The fluid chamber is provided with a pressure regulating assembly 5, and the drainage pressure of the diaphragm pump can be controlled by controlling the spring pre-tightening force of a pressure regulating spring in the pressure regulating assembly 5.

While the preferred embodiments of the present invention have been illustrated, various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention.

Claims (10)

1. A flat-head fluid chamber three-cavity pressure relief reverse osmosis diaphragm pump comprises a fluid chamber (1), an aluminum support frame (2) and a motor shell (9) which are sequentially assembled from top to bottom; a diaphragm chamber (3) and a diaphragm body (4) are sequentially pressed between the fluid chamber (1) and the aluminum support frame (2); the diaphragm chamber (3) and the fluid chamber (1) are matched to form a high-pressure cavity (Q2) and a low-pressure cavity (Q1) which are mutually independent; the low-pressure cavity (Q1) is communicated with a water inlet (1a) of the fluid chamber (1), and the high-pressure cavity (Q2) is communicated with a water outlet (1b) of the fluid chamber (1); the method is characterized in that: the top surface of the fluid chamber (1) is a circular flat top surface, a pressure regulating valve cavity (1c) is machined in the center of the flat top surface, and the pressure regulating valve cavity (1c), the diaphragm chamber (3), the diaphragm body (4) and the motor shell (9) have the same axis; the pressure regulating valve cavity is internally provided with a pressure regulating assembly (5) for controlling the water pressure, and the pressure regulating assembly (5) comprises a pressure regulating spring, a spring base (52) and a pressure regulating valve (53) which are sequentially pressed in the pressure regulating valve cavity through a small top cover (51); the horizontal plane of the upper surface of the small top cover (51) is slightly lower than the horizontal plane of the flat top surface of the fluid chamber (1), or the horizontal plane of the upper surface of the small top cover (51) is level with the horizontal plane of the flat top surface of the fluid chamber (1); three suction check cavities forming a three-cavity diaphragm chamber are formed in the bottom surface of the diaphragm chamber (3), and a discharge check cavity (32) surrounded by an annular upper surrounding edge (31) is formed in the center of the top ring of the diaphragm chamber (3); the suction check cavity is internally provided with a water suction pore channel (K1) used for communicating the suction check cavity with the low-pressure cavity (Q1), three drainage pore channel groups used for correspondingly communicating with the corresponding suction check cavity are formed in the discharge check cavity (32), and each drainage pore channel group consists of a plurality of drainage pore channels (K2).

2. The three-chamber pressure relief reverse osmosis diaphragm pump of claim 1, wherein: a convex ring (11) which is used for being in sealing press fit with an upper peripheral edge (31) of the diaphragm chamber (3) is formed in the fluid chamber (1), and an O-shaped ring (F) with a sealing function is pressed between the convex ring (11) and the upper peripheral edge (31); the high-pressure cavity (Q2) is formed by a space surrounded by the upper surrounding edge (31) and the convex ring (11).

3. The three-chamber pressure relief reverse osmosis membrane pump with the flat head fluid chamber as claimed in claim 2, wherein: the suction check valve (61) is arranged in the suction check cavity and used for preventing sucked water from returning to the low-pressure cavity (Q1), the suction check valve (61) comprises a suction valve plate (611) which is used for being matched with the water suction duct (K1) in a sealing mode and a suction valve rod (612) connected to the center of the suction valve plate (611), and a mounting hole (3a) for enabling the suction valve rod (612) to be inserted and assembled is formed in the center of the suction check cavity.

4. The three-chamber pressure relief reverse osmosis membrane pump with the flat head fluid chamber as claimed in claim 3, wherein: the discharge check cavity (32) is internally provided with a discharge check valve (62) for preventing discharged water from returning to be sucked into the check cavity, the discharge check valve (62) comprises a discharge valve plate (621) which is used for being matched with a drainage hole (K2) in a sealing mode and a discharge valve rod (622) connected to the center of the discharge valve plate (621), and a fitting hole (3b) for enabling the discharge valve rod (622) to be inserted and assembled is formed in the center of the discharge check cavity (32).

5. The three-chamber pressure relief reverse osmosis membrane pump with the flat head fluid chamber as claimed in claim 4, wherein: three grooves (3c) for dividing three groups of drainage pore passages (K2) are formed in the discharge check cavity (32), and a dividing strip (623) for being in sealing insertion fit with the grooves (3c) is formed on the bottom surface of the discharge valve plate (621).

6. The three-chamber pressure relief reverse osmosis membrane pump with the flat head fluid chamber as claimed in claim 5, wherein: three mutually independent sealing areas (41) are formed on the diaphragm body (4), and three mutually independent pump chambers (S) are formed by the three sealing areas (41) and the three suction check cavities in a one-to-one correspondence manner; an annular clamping groove (42) for mounting the piston sheet (7) is formed in the sealing area (41), and an inserting convex ring (71) for clamping into the clamping groove (42) is formed in the piston sheet (7).

7. The three-chamber pressure relief reverse osmosis membrane pump with the flat head fluid chamber as claimed in claim 6, wherein: the motor shell (9) consists of a cylindrical shell (91), a front end cover (92) and a rear end cover (93); the front end cover (92) is fixedly arranged on the front end opening of the shell (91), and the rear end cover (93) is fixedly arranged on the rear end opening of the shell (91); rear end cap (93) on the shaping have two carbon brush sliding chamber (931) that are used for the slidable mounting carbon brush, two carbon brush sliding chamber (931) circumference 180 degrees apart, every carbon brush sliding chamber (931) all set one and be used for clamping carbon brush checkpost (94) of carbon brush, rear end cap (93) be provided with lead wire breach (932) that are used for drawing the power cord, lead wire breach (932) in the card be equipped with outlet protective sheath (95).

8. The three-chamber pressure relief reverse osmosis membrane pump with the flat head fluid chamber as claimed in claim 7, wherein: the aluminum support frame (2) is fixedly connected with a front end cover (92) of a motor shell (9), a piston frame assembly cavity (H) is formed between the aluminum support frame (2) and the front end cover (92), a piston frame (8) which can move along a track by pushing a piston sheet (7) fixed on a diaphragm body (4) through swinging is arranged in the piston frame assembly cavity (H), and a convex body (81) which is used for being in top contact fit with the piston sheet (7) is formed at the position corresponding to each piston sheet (7) on the piston frame (8).

9. The three-chamber pressure relief reverse osmosis membrane pump with the flat head fluid chamber of claim 8, wherein: the shaping has and is used for location cavity (1d) with little top cap (51) location complex on the flat top surface of fluid chamber (1), location cavity (1d) medium radian shaping have four screw holes (1e), the shaping has counter sink (511) that four confession screws wear to establish on the top surface of little top cap (51), the bottom surface shaping of little top cap (51) has and is used for with the upper end location suit complex annular location chamber (512) of pressure regulating spring.

10. The three-chamber pressure relief reverse osmosis membrane pump with the flat head fluid chamber of claim 9, wherein: a top cover sealing ring (54) with a sealing function is sleeved and arranged on the small top cover (51) in a matching and pressing mode, and a triangular sealing ring (M) is arranged between the fluid chamber (1) and the aluminum supporting frame (2) in a pressing mode.

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