Diaphragm pump

Abstract

The utility model discloses a diaphragm pump, and belongs to the field of diaphragm pumps. Comprising a pump body, a motor, installation supporting legs and an overpressure power-off device, water pump installation holes are formed in the installation supporting legs, and a water inlet cavity and a water outlet cavity are formed in the pump body and connected with a water inlet pipeline and a water outlet pipeline respectively; the water inlet pipeline is located on one side of the installation supporting leg and axially consistent with the water pump installation hole, and the water outlet pipeline is located on one side, opposite to the motor, of the pump body and axially consistent with a motor shaft. A diaphragm piece and a pump cover are arranged on the two sides of the pump body, and a working cavity is formed between the pump cover and the diaphragm piece. A water inlet valve and a water outlet valve are respectively arranged on two sides of the water inlet cavity and the water outlet cavity; an eccentric mechanism is arranged in the pump body, the motor output shaft drives the diaphragm piece to deform in a reciprocating mode through the eccentric mechanism, the overpressure power-off device is arranged on the side face of the water outlet pipeline, and the action direction of the overpressure power-off device is perpendicular to the axial direction of the motor output shaft. The water inlet connector does not need elbow parts, installation is convenient and firm, sealing is reliable, and the overpressure power-off device and the water outlet connector are compact in arrangement structure.

Description

Technical Field

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

[0002] The diaphragm pump relies on the back and forth movement of the diaphragm to change the volume of the working chamber to inhale and discharge liquid. The diaphragm separates the inhaled liquid from the discharged liquid. When the diaphragm moves to one side, the working chamber is negatively pressurized and the liquid is inhaled. When the diaphragm moves to the other side, the liquid is discharged.

[0003] One of the major uses of diaphragm pumps is to use them on tools such as electric sprayers. The electric sprayer has multiple screw holes, and the diaphragm pump has multiple mounting legs, each of which has a water pump mounting hole. When installing, align the water pump mounting hole on the mounting leg with the screw hole on the sprayer and connect them with screws.

[0004] The water inlet and outlet of the diaphragm pump of the prior art electric sprayer are located on the two sides of the diaphragm pump body, and the directions of the water inlet and outlet joints are perpendicular to the axial direction of the water pump mounting hole (i.e., perpendicular to the plane where the mounting legs are located). After the diaphragm pump is installed, it is necessary to add elbows and other parts to the water inlet joint to achieve the connection with the sprayer water tank, which not only increases the number of assembly parts, but also easily leads to unreliable connection and fastening seal, resulting in leakage or elbow folding and blocking of the water inlet, resulting in difficulty in absorbing water.

[0005] In order to limit the water pump pressure, the prior art generally sets an overpressure power-off device, which is generally set on the side of the water pump body opposite to the motor, and the axial direction of the pressure-limiting structure and the direction of pushing the micro switch to open and close are consistent with the axial direction of the motor. However, this pressure-limiting arrangement makes it difficult to arrange the water outlet joint on the side of the water pump body opposite to the motor, and arranging the water outlet joint on other sides of the water pump will cause inconvenience in connecting the water pump with the hose, etc. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a diaphragm pump, which does not need to be equipped with an elbow structure at the water inlet joint. The installation is convenient and firm, and the sealing is reliable. It will not cause leakage or elbow folding and blocking of the water suction port causing difficulty in absorbing water. The overpressure power-off device and the water outlet joint are arranged in a compact structure.

[0007] The utility model provides the following technical solutions:

[0008] A diaphragm pump comprises a pump body and a motor, wherein the pump body is provided with a water inlet chamber and a water outlet chamber which are isolated from each other, the water inlet chamber is connected to a water inlet pipe, and the water outlet chamber is connected to a water outlet pipe;

[0009] The diaphragm pump also includes a mounting leg, a water pump mounting hole is formed on the mounting leg, the water inlet pipe is located on one side of the mounting leg, the axial direction of the water inlet pipe is parallel to the axial direction of the water pump mounting hole, and the water inlet joint at the end of the water inlet pipe extends outward from the pump body; the water outlet pipe is located on the side of the pump body opposite to the motor, the axial direction of the water outlet pipe is parallel to the axial direction of the output shaft of the motor, and the water outlet joint at the end of the water outlet pipe extends outward from the pump body;

[0010] The two opposite end surfaces of the pump body parallel to the axial direction of the water pump mounting hole are each provided with a diaphragm, a pump cover is provided on the outer side of the diaphragm, and a working chamber is formed between the pump cover on one side and the diaphragm; water inlet valves are respectively provided on both sides of the water inlet chamber so that the water inlet chamber is connected to the working chamber in one direction, and water outlet valves are respectively provided on both sides of the water outlet chamber so that the working chamber is connected to the water outlet chamber in one direction;

[0011] An eccentric mechanism is provided in the pump body, the axial direction of the output shaft of the motor is perpendicular to the axial direction of the water pump mounting hole, the output shaft is connected to the diaphragm through the eccentric mechanism, and the output shaft drives the diaphragm to deform and move reciprocatingly through the eccentric mechanism;

[0012] The diaphragm pump also includes an overpressure power-off device, which is arranged on the side of the water outlet pipe, and the action direction of the overpressure power-off device is perpendicular to the axial direction of the output shaft of the motor.

[0013] Furthermore, the eccentric mechanism includes an eccentric wheel, a bearing and a connecting rod. The eccentric wheel is sleeved on the output shaft, the bearing is sleeved on the eccentric wheel, the bearing is located in the center hole of the connecting rod, and the two ends of the connecting rod are respectively connected to the diaphragm at the two ends of the pump body. The output shaft of the motor drives the diaphragm to reciprocate and deform through the eccentric wheel, the bearing and the connecting rod.

[0014] Furthermore, connecting columns are provided at both ends of the connecting rod, the ends of the connecting columns are inverted cone structures, and connecting holes are opened on the diaphragm sheet, and the shape of the inner wall of the connecting hole is adapted to the shape of the connecting column.

[0015] Further, the water inlet valve comprises a water inlet valve seat and a water inlet valve core, the water inlet cavity is a cavity that passes through both sides of the pump body, the water inlet valve seat is sealingly assembled at both ends of the water inlet cavity, the water inlet valve core is arranged on the water inlet valve seat, and a water inlet valve spring is arranged between the water inlet valve core and the pump cover;

[0016] The water outlet valve includes a water outlet valve seat and a water outlet valve core. The water outlet cavity is a cavity that passes through both sides of the pump body. The water outlet valve seat is sealingly assembled at both ends of the water outlet cavity. The water outlet valve core is arranged on the water outlet valve seat. A water outlet valve spring is arranged between the water outlet valve core and the connecting seat in the water outlet cavity.

[0017] Furthermore, the water inlet valve seat and the water outlet valve seat are an integrated structure, and at least one sealing ring is arranged on the outer periphery of the water inlet joint.

[0018] Furthermore, the motor is covered with a motor shell or a motor bracket is provided on the motor, and the mounting legs are provided on the motor shell or the motor bracket.

[0019] Furthermore, the water inlet pipe is connected to the water inlet chamber through a water inlet hole, and the water outlet chamber is connected to the water outlet pipe through a water outlet hole; the water inlet hole is located in the middle part of the water inlet chamber, and the water outlet hole is located in the part of the water outlet chamber close to the overpressure power-off device.

[0020] Furthermore, a high-pressure chamber connected to the water outlet pipe and opening toward the outside is provided on the side of the water outlet pipe, and the overpressure power-off device is provided on the high-pressure chamber.

[0021] Furthermore, the overpressure power-off device includes a pressure-reducing cushion, a spring sleeve, a pressure-limiting spring, a spring seat and a pressure-adjusting screw, which are arranged in sequence from a side close to the water outlet pipe to a side away from the water outlet pipe; the pressure-reducing cushion is arranged on the opening of the high-pressure chamber, and the end of the spring sleeve away from the water outlet pipe is an outward flange structure, and the contact head of the microswitch that controls the on and off of the motor is located on the side of the flange structure away from the water outlet pipe; a pressure-reducing ring is arranged on the outer periphery of the spring sleeve, and the pressure-reducing ring is located on the side of the spring sleeve close to the water outlet pipe.

[0022] Furthermore, the overpressure power-off device further comprises a pressure-limiting fixing seat and a switch cover, wherein the pressure-limiting fixing seat is mounted on the water outlet pipe and is located on one side of the opening of the high-pressure chamber, and the switch cover is mounted on one side of the pressure-limiting fixing seat away from the water outlet pipe;

[0023] The pressure reducing cushion is located in a groove at one end of the high-pressure chamber opening, the spring sleeve, the pressure limiting spring, the spring seat and the pressure reducing ring are assembled in the pressure limiting fixing seat, the pressure adjusting screw is located on the switch cover, the micro switch is located in the switch cover, and the contact head of the micro switch extends into the pressure limiting fixing seat.

[0024] The utility model has the following beneficial effects:

[0025] The utility model sets the water inlet pipe of the diaphragm pump and the pump installation hole axially in the same direction (i.e., the up-down direction). When installing the diaphragm pump, the sprayer is inverted, and the water inlet joint is directly inserted downward into the round hole at the bottom of the sprayer medicine box to connect with the medicine box, and then the diaphragm pump is connected and fastened with the bottom of the sprayer medicine box through the water pump installation hole using screws. The water inlet joint does not need to use elbow parts, and the installation is convenient and firm, and the sealing is reliable, and will not cause leakage or elbow folding and blocking of the water suction port to cause difficulty in absorbing water. In addition, the water outlet pipe is set on the side of the pump body opposite to the motor, and the direction of the water outlet pipe is consistent with the axial direction of the motor and the water outlet joint is led out from the front end of the diaphragm pump, so that the water outlet joint can be conveniently connected to the spray hose and guide the hose to pass through the hole on the bottom side wall of the sprayer medicine box, and no elbow parts are needed.

[0026] The utility model combines an overpressure power-off device with a water outlet pipe, both of which are arranged on a side of the pump body opposite to the motor (i.e., the front end). The direction of the water outlet pipe is consistent with the axial direction of the output shaft of the motor and a water outlet joint is led out from the front end of the pump body. The overpressure power-off device is arranged in the left-right direction or the up-down direction of the water outlet pipe, so that the water outlet joint can be conveniently connected to the spray hose and guide the hose to pass through the hole on the side wall of the bottom of the sprayer medicine box. The existence of the overpressure power-off device not only ensures the safety of the diaphragm pump, but also makes the structure of the diaphragm pump more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the arrangement of the water inlet pipe and the water outlet pipe of a diaphragm pump in the prior art;

[0028] Figure 2 This is a front view of the multi-core diaphragm pump of the utility model (view from left to right);

[0029] Figure 3 for Figure 2 AA section view;

[0030] Figure 4 for Figure 2 BB section view in the figure;

[0031] Figure 5 for Figure 2 CC section view;

[0032] Figure 6 for Figure 2 Front view (view from front to back);

[0033] Figure 7 for Figure 2 A top view (a view looking down from above). DETAILED DESCRIPTION

[0034] In order to make the technical problems to be solved, technical solutions and advantages of the present invention more clear, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0035] For ease of understanding, the utility model defines the front, rear, left, right, up and down directions of the diaphragm pump according to the usual use direction of the sprayer after the diaphragm pump is installed on the sprayer. Screw holes are provided on the outer wall of the bottom surface of the sprayer medicine box. When the diaphragm pump is installed, the water pump mounting holes on its mounting legs are aligned with the screw holes on the sprayer and connected by screws. When the sprayer is in normal use, the diaphragm pump is installed on the outside of the bottom surface of the sprayer medicine box with the mounting legs facing upward.

[0036] Therefore, the utility model defines the direction of the side where the mounting leg of the diaphragm pump is located as upward, the direction opposite to the upward is defined as downward, the direction of the side where the diaphragm pump body is located is defined as front, the direction of the side where the diaphragm pump motor is located is defined as rear (opposite to the front), and the direction perpendicular to the up and down directions and the front and back directions is defined as left and right directions.

[0037] like Figure 1 As shown, the up, down, left, right, front, and back directions are shown (the up, down, left, right, front, and back directions of all other pictures are the same as Figure 1 The front is perpendicular to the paper plane and outward, and the rear is perpendicular to the paper plane and inward. In the prior art, the direction of the water pump installation hole is up and down, and the direction of the water inlet joint and the water outlet joint is perpendicular to it, that is, left and right. It is necessary to add an elbow to the water inlet joint to achieve the connection with the sprayer water tank. Figure 1 The bending directions of the added elbows given are only examples, and the bending directions such as upward, downward, forward, or backward should be determined according to the actual situation.

[0038] like Figure 1 As shown, the overpressure power-off device of the prior art is arranged on the front side of the pump body, that is, on the side opposite to the motor, and its action direction is also in the front-to-back direction, parallel to the output shaft of the motor. This pressure-limiting arrangement makes it difficult to arrange the water outlet joint on the front side of the water pump body, and arranging the water outlet joint on the left and right sides of the water pump will cause inconvenience in connecting the water pump with the hose, etc.

[0039] In order to solve the above problems, the utility model provides a diaphragm pump, such as Figure 2-7 As shown, it includes a pump body 1 and a motor 2. The pump body 1 is provided with a water inlet chamber 3 and a water outlet chamber 4 which are isolated from each other. In one example, the water outlet chamber 4 can be located below the water inlet chamber 3. The water inlet chamber 3 is connected to a water inlet pipe 5, and the water outlet chamber 4 is connected to a water outlet pipe 6.

[0040] The diaphragm pump also includes a mounting leg 40, on which a water pump mounting hole 41 is formed. The water inlet pipe 5 is located on one side of the mounting leg 40 of the pump body 1, i.e., on the upper side; and the axial direction of the water inlet pipe 5 is parallel to the axial direction of the water pump mounting hole 41, i.e., in the up-down direction. The water inlet joint 7 at the end of the water inlet pipe 5 extends outward from the pump body 1, i.e., extends upward from the top of the pump body 1. The water outlet pipe 6 is located on the side of the pump body 1 opposite to the motor 2, i.e., on the front side; and the axial direction of the water outlet pipe 6 is parallel to the axial direction of the output shaft 14 of the motor 2, i.e., in the front-to-back direction. The water outlet joint 8 at the end of the water outlet pipe 6 extends outward from the pump body 1, i.e., extends forward from the front of the pump body 1.

[0041] The pump body 1 is provided with a diaphragm 9 on two opposite end faces (i.e., left and right end faces) parallel to the axial direction of the water pump mounting hole 41, and a pump cover 10 is provided on the outside of the diaphragm 9, and a working chamber 11 is formed between the pump cover 10 on one side and the diaphragm 9. A water inlet valve 12 is provided on both sides (i.e., left and right sides) of the water inlet chamber 3 to enable one-way communication between the water inlet chamber 3 and the working chamber 11, and a water outlet valve 13 is provided on both sides (i.e., left and right sides) of the water outlet chamber 4 to enable one-way communication between the working chamber 11 and the water outlet chamber 4.

[0042] An eccentric mechanism is provided in the pump body 1. The axial direction of the output shaft 14 of the motor 2 is perpendicular to the axial direction of the water pump mounting hole 41, that is, it is arranged in the front-to-back direction. The output shaft 14 is connected to the diaphragm 9 through the eccentric mechanism. The output shaft 14 drives the diaphragm 9 to deform and move reciprocatingly (that is, reciprocating left and right) through the eccentric mechanism.

[0043] The diaphragm pump also includes an overpressure power-off device 15, which is arranged on the front side of the pump body and on the side of the water outlet pipe. The movement direction of the overpressure power-off device 15 is perpendicular to the axial direction of the output shaft 14 of the motor 1, that is, its movement direction is left and right or up and down.

[0044] When the diaphragm pump is working, the water inlet pipe is connected to the liquid, and the power supply of the motor is turned on. Since the eccentric mechanism on the output shaft of the motor is not concentric with the motor shaft and has an eccentricity, the eccentric mechanism swings back and forth with the rotation of the motor, driving the diaphragm to deform and move back and forth, so that the volume of the working chamber continues to expand and shrink. When the diaphragm deforms to one side of the pump body, the volume of the working chamber increases, and negative pressure is generated in the working chamber, and the liquid is sucked from the water inlet chamber into the working chamber through the water inlet valve; when the diaphragm deforms to one side of the pump cover, the volume of the working chamber decreases, and the pressure in the working chamber increases. The liquid is pressed from the working chamber into the water outlet chamber through the water outlet valve and enters the water outlet pipe to complete the liquid transportation.

[0045] The utility model sets the water inlet pipe of the diaphragm pump and the pump installation hole axially in the same direction (i.e., up and down direction). When installing the diaphragm pump, the sprayer is inverted (i.e., the bottom surface is upward), and the water inlet joint is directly inserted downward into the circular hole at the bottom of the sprayer medicine box to connect with the medicine box, and then the diaphragm pump is connected and fastened with the bottom of the sprayer medicine box through the water pump installation hole using screws. The water inlet joint does not need to use elbow parts, and the installation is convenient and firm, and the sealing is reliable, and will not cause leakage or elbow folding and blocking of the water suction port to cause difficulty in absorbing water. In addition, the water outlet pipe is set on the side of the pump body opposite to the motor, and the direction of the water outlet pipe is consistent with the axial direction of the motor and the water outlet joint is led out from the front end of the diaphragm pump, so that the water outlet joint can be conveniently connected to the spray hose and guide the hose to pass through the hole on the bottom side wall of the sprayer medicine box, and no elbow parts are needed.

[0046] In order to solve the problem of setting the overpressure power-off device in the prior art, the utility model combines the overpressure power-off device with the water outlet pipe, both of which are arranged at the front end of the pump body. The direction of the water outlet pipe is consistent with the axial direction of the output shaft of the motor and a water outlet joint is led out from the front end of the pump body. The overpressure power-off device is arranged in the left and right directions or the up and down directions of the water outlet pipe, so that the water outlet joint can be conveniently connected to the spray hose and guide the hose to pass through the hole on the bottom side wall of the sprayer medicine box. The existence of the overpressure power-off device not only ensures the safety of the diaphragm pump, but also makes the structure of the diaphragm pump more compact.

[0047] As a preferred embodiment, the overpressure power-off device is located on the left or right side of the water outlet pipe, which can fully utilize the space on the front side of the pump body and make the diaphragm pump structure more compact.

[0048] More specifically, a high-pressure chamber 16 communicating with the water outlet pipe 6 and opening toward the outside is provided on a side (eg, the left or right side) of the water outlet pipe 6 , and the overpressure power-off device 15 is provided on the high-pressure chamber 16 .

[0049] The overpressure power-off device 15 includes a pressure relief cushion 17, a spring sleeve 18, a pressure-limiting spring 19, a spring seat 20 and a pressure-adjusting screw 21, which are arranged in sequence from the side close to the water outlet pipe 6 to the side away from the water outlet pipe 6. The pressure relief cushion 17 is arranged on the opening of the high-pressure chamber 16, and the end of the spring sleeve 18 away from the water outlet pipe 6 is an outward flange structure, and the contact head 23 of the micro switch 22 for controlling the on and off of the motor 2 is located on the side of the flange structure away from the water outlet pipe 6. A pressure relief ring 24 is arranged on the outer periphery of the spring sleeve 18, and the pressure relief ring 24 is located on the side of the spring sleeve 18 close to the water outlet pipe 6.

[0050] The utility model can limit the water pressure of the water outlet pipe 6 through the overpressure power-off device 15. The water outlet pipe 6 is connected to the pressure-reducing cushion 17 through the high-pressure chamber 16. When the water outlet pipe 6 is blocked, its water pressure rises to a certain value, and the high-pressure liquid generates pressure on the pressure-reducing cushion 17. The pressure-reducing cushion 17 is deformed in the direction away from the water outlet pipe 6, pushing the spring sleeve 18 to move a certain distance. The flange structure of the spring sleeve 18 presses the touch head 23 of the micro switch 22, so that the motor circuit is disconnected and powered, and the motor stops running. The water pressure in the water outlet pipe 6 is limited to a certain range to prevent damage to the diaphragm pump and other equipment. When the blockage fault is eliminated, the water pressure of the water outlet pipe 6 is reduced, the pressure-reducing cushion and the spring sleeve are reset under the pressure of the pressure-limiting spring, the touch head 23 of the micro switch 22 is reset, and the motor starts to run again.

[0051] The decompression ring 24 on the outer periphery of the spring sleeve 18 provides a guide for the movement of the spring sleeve 18, and a space for the decompression cushion to deform is reserved at the bottom of the decompression ring 24. The pressure regulating screw 21 is used to adjust the position of the spring seat 20 and set the pressure value when the power is off.

[0052] To facilitate the assembly of the various components of the overpressure power-off device 15, it also includes a pressure limiting fixing seat 25 and a switch cover 26. The pressure limiting fixing seat 25 is installed on the water outlet pipe 6 and is located on the opening side of the high-pressure chamber 16. The switch cover 26 is installed on the side of the pressure limiting fixing seat 25 away from the water outlet pipe 6.

[0053] The pressure relief cushion 17 is located in the groove at one end of the opening of the high pressure chamber 16, the spring sleeve 18, the pressure limiting spring 19, the spring seat 20 and the pressure relief ring 24 are assembled in the pressure limiting fixing seat 25, the pressure regulating screw 21 is located on the switch cover 26, the axial direction of the pressure regulating screw 21 is in the left-right direction, and the end thereof extends out of the outermost end of the switch cover 26. The micro switch 22 is located in the switch cover 26, and the contact head 23 of the micro switch 22 extends into the pressure limiting fixing seat 25, and cooperates with the flange structure of the spring sleeve 18.

[0054] In the illustration of the present invention, the overpressure power-off device 15 is located on the left side of the water outlet pipe 6. Of course, it can also be located on the right side, as long as the water outlet pipe 6 is set to the left side, which only involves the relative position change of the overpressure power-off device 15 and the water outlet pipe 6. In addition, the overpressure power-off device 15 can also be located on the upper side or the lower side of the water outlet pipe 6, but it is more compact when it is located on the left and right sides than on the upper and lower sides.

[0055] As an improvement of the present utility model, the aforementioned eccentric mechanism includes an eccentric wheel (not shown), a bearing 28 and a connecting rod 27. The inner ring of the eccentric wheel is sleeved on the output shaft 14 of the motor 2, the inner ring of the bearing 28 is sleeved on the outer ring of the eccentric wheel, the outer ring of the bearing 28 is located in the center hole of the connecting rod 27, and the two ends (i.e., the left and right ends) of the connecting rod 27 are respectively connected to the diaphragm 9 at the two ends (i.e., the left and right ends) of the pump body 1. The output shaft 14 of the motor 2 drives the diaphragm 9 (left and right) to reciprocate and deform and move through the eccentric wheel, the bearing 28 and the connecting rod 27, thereby changing the volume of the working chamber.

[0056] To facilitate the connection between the connecting rod 27 and the diaphragm 9, connecting columns 28 are provided at the left and right ends of the connecting rod 27. The ends of the connecting columns 28 are inverted cone structures. A connecting hole is opened on the diaphragm 9, and the inner wall shape of the connecting hole 9 is adapted to the shape of the connecting column 28.

[0057] As another improvement of the utility model, the water inlet valve 12 includes a water inlet valve seat 29 and a water inlet valve core 30. The water inlet cavity 3 is a cavity that penetrates the pump body 1 (in the left and right directions). The water inlet valve seat 29 is sealed and assembled at both ends (left and right) of the water inlet cavity 3. Specifically, the diaphragm 9 is sealed and arranged between the pump body 1 and the pump cover 10, and the diaphragm 9 has a mounting hole for mounting the water inlet valve core 30. The water inlet valve core 30 is mounted on the diaphragm 9 through the mounting hole and is limited by the assembly of the pump body 1 and the pump cover 10.

[0058] A water through hole is arranged on the water inlet valve seat 29 , a water inlet valve core 30 is arranged on the water through hole of the water inlet valve seat 29 , and a water inlet valve spring 31 is arranged between the water inlet valve core 30 and the pump cover 10 .

[0059] When negative pressure is generated in the working chamber, the pressure generated by the water inlet chamber on the water inlet valve core causes the water inlet valve spring to contract, the water through hole of the water inlet valve opens, and the liquid enters the working chamber from the water inlet chamber; when the pressure in the working chamber increases, the water inlet valve spring resets, and the water inlet valve spring and the water pressure in the working chamber cause the water inlet valve core to press against the water through hole of the water inlet valve seat, and the water inlet valve closes.

[0060] The water outlet valve 13 includes a water outlet valve seat 32 and a water outlet valve core 33. The water outlet chamber 4 is a cavity that passes through the pump body 1 (left and right directions). The water outlet valve seat 32 is sealed and assembled at both ends (left and right) of the water outlet chamber 4. The water outlet valve core 33 is arranged on the water outlet valve seat 32. A water outlet valve spring 35 is arranged between the water outlet valve core 33 and the connecting seat 34 in the water outlet chamber 4.

[0061] The assembly method of the outlet valve seat 32 and the outlet valve core 33 of the outlet valve 13, and the two and the diaphragm 9 is similar to that of the specific inlet valve 12, but in the opposite direction. When the pressure in the working chamber increases, the pressure generated by the working chamber on the outlet valve core causes the outlet valve spring to contract, the water hole of the outlet valve opens, and the liquid enters the outlet chamber from the working chamber; when negative pressure is generated in the working chamber, the outlet valve spring is reset, and the outlet valve spring and the negative pressure in the working chamber cause the outlet valve core to press against the water hole of the outlet valve seat, and the outlet valve is closed.

[0062] For the convenience of production and assembly, the water inlet valve seat 29 and the water outlet valve seat 32 can be an integral structure. Of course, the two can also be split structures, and the utility model does not limit this.

[0063] The aforementioned water inlet pipe 5 is connected to the water inlet chamber 3 through the water inlet hole 36, and the water outlet chamber 4 is connected to the water outlet pipe 6 through the water outlet hole 37. Specifically, the water inlet hole 36 is located in the middle part of the upper side of the water inlet chamber 3, and the water outlet hole 37 is located at the front side of the water outlet chamber 4 near the overpressure power-off device.

[0064] Preferably, at least one circle of (O-type) sealing ring 38 is provided on the outer circumference of the water inlet connector 7, so as to facilitate directly inserting the water inlet connector 7 into the circular hole at the bottom of the sprayer medicine box to communicate with the medicine box.

[0065] The motor 2 is covered with a motor housing 39 , or a motor bracket (not shown) is provided on the motor 2 , and the mounting legs 41 are provided on the motor housing 39 or the motor bracket.

[0066] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A diaphragm pump, characterized in that: It comprises a pump body and a motor, wherein the pump body is provided with a water inlet chamber and a water outlet chamber which are isolated from each other, the water inlet chamber is connected to a water inlet pipe, and the water outlet chamber is connected to a water outlet pipe; The diaphragm pump also includes a mounting leg, a water pump mounting hole is formed on the mounting leg, the water inlet pipe is located on one side of the mounting leg, the axial direction of the water inlet pipe is parallel to the axial direction of the water pump mounting hole, and the water inlet joint at the end of the water inlet pipe extends outward from the pump body; the water outlet pipe is located on the side of the pump body opposite to the motor, the axial direction of the water outlet pipe is parallel to the axial direction of the output shaft of the motor, and the water outlet joint at the end of the water outlet pipe extends outward from the pump body; The two opposite end surfaces of the pump body parallel to the axial direction of the water pump mounting hole are each provided with a diaphragm, a pump cover is provided on the outer side of the diaphragm, and a working chamber is formed between the pump cover on one side and the diaphragm; water inlet valves are respectively provided on both sides of the water inlet chamber so that the water inlet chamber is connected to the working chamber in one direction, and water outlet valves are respectively provided on both sides of the water outlet chamber so that the working chamber is connected to the water outlet chamber in one direction; An eccentric mechanism is provided in the pump body, the axial direction of the output shaft of the motor is perpendicular to the axial direction of the water pump mounting hole, the output shaft is connected to the diaphragm through the eccentric mechanism, and the output shaft drives the diaphragm to deform and move reciprocatingly through the eccentric mechanism; The diaphragm pump also includes an overpressure power-off device, which is arranged on the side of the water outlet pipe, and the action direction of the overpressure power-off device is perpendicular to the axial direction of the output shaft of the motor.

2. The diaphragm pump according to claim 1, characterized in that: The eccentric mechanism includes an eccentric wheel, a bearing and a connecting rod. The eccentric wheel is sleeved on the output shaft, and the bearing is sleeved on the eccentric wheel. The bearing is located in the center hole of the connecting rod. The two ends of the connecting rod are respectively connected to the diaphragm at the two ends of the pump body. The output shaft of the motor drives the diaphragm to deform and move reciprocatingly through the eccentric wheel, the bearing and the connecting rod.

3. The diaphragm pump according to claim 2, characterized in that: Connecting columns are arranged at both ends of the connecting rod, and the ends of the connecting columns are inverted cone structures. A connecting hole is opened on the diaphragm sheet, and the shape of the inner wall of the connecting hole is adapted to the shape of the connecting column.

4. The diaphragm pump according to claim 1, characterized in that: The water inlet valve comprises a water inlet valve seat and a water inlet valve core, the water inlet cavity is a cavity that passes through both sides of the pump body, the water inlet valve seat is sealingly assembled at both ends of the water inlet cavity, the water inlet valve core is arranged on the water inlet valve seat, and a water inlet valve spring is arranged between the water inlet valve core and the pump cover; The water outlet valve includes a water outlet valve seat and a water outlet valve core. The water outlet cavity is a cavity that passes through both sides of the pump body. The water outlet valve seat is sealingly assembled at both ends of the water outlet cavity. The water outlet valve core is arranged on the water outlet valve seat. A water outlet valve spring is arranged between the water outlet valve core and the connecting seat in the water outlet cavity.

5. The diaphragm pump according to claim 4, characterized in that: The water inlet valve seat and the water outlet valve seat are an integrated structure, and at least one sealing ring is arranged on the outer periphery of the water inlet joint.

6. The diaphragm pump according to claim 1, characterized in that: The motor is covered with a motor shell or a motor bracket is arranged on the motor, and the mounting legs are arranged on the motor shell or the motor bracket.

7. The diaphragm pump according to any one of claims 1 to 6, characterized in that: The water inlet pipe is connected to the water inlet cavity through the water inlet hole, and the water outlet cavity is connected to the water outlet pipe through the water outlet hole; the water inlet hole is located in the middle part of the water inlet cavity, and the water outlet hole is located in the part of the water outlet cavity close to the overpressure power-off device.

8. The diaphragm pump according to claim 7, characterized in that: A high-pressure chamber connected with the water outlet pipe and opening toward the outside is arranged on the side of the water outlet pipe, and the overpressure power-off device is arranged on the high-pressure chamber.

9. The diaphragm pump according to claim 8, characterized in that: The overpressure power-off device includes a pressure-reducing cushion, a spring sleeve, a pressure-limiting spring, a spring seat and a pressure-adjusting screw which are arranged in sequence from a side close to the water outlet pipe to a side away from the water outlet pipe; the pressure-reducing cushion is arranged on the opening of the high-pressure chamber, and the end of the spring sleeve away from the water outlet pipe is an outward flange structure, and the contact head of the microswitch for controlling the on and off of the motor is located on the side of the flange structure away from the water outlet pipe; a pressure-reducing ring is arranged on the outer periphery of the spring sleeve, and the pressure-reducing ring is located on the side of the spring sleeve close to the water outlet pipe.

10. The diaphragm pump according to claim 9, characterized in that The overpressure power-off device further comprises a pressure-limiting fixing seat and a switch cover, wherein the pressure-limiting fixing seat is mounted on the water outlet pipe and is located on one side of the opening of the high-pressure chamber, and the switch cover is mounted on one side of the pressure-limiting fixing seat away from the water outlet pipe; The pressure reducing cushion is located in a groove at one end of the high-pressure chamber opening, the spring sleeve, the pressure limiting spring, the spring seat and the pressure reducing ring are assembled in the pressure limiting fixing seat, the pressure adjusting screw is located on the switch cover, the micro switch is located in the switch cover, and the contact head of the micro switch extends into the pressure limiting fixing seat.

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