CN117365917A - Diaphragm pump with adjustable water yield - Google Patents

Abstract

The invention discloses a diaphragm pump with adjustable water yield, which comprises a pump head body, wherein a first water inlet cavity, a second water inlet cavity, a pressurizing cavity and a water outlet cavity are arranged in the pump head body, the first water inlet cavity and the water outlet cavity are respectively communicated with a water inlet and a first water outlet, the second water inlet cavity is communicated with the pressurizing cavity through a unidirectional water flow control structure, a second water outlet is also arranged on the pump head body, and an adjusting component for adjusting the water yield through displacement change is arranged on a waterway where the second water outlet is communicated with the first water outlet. The invention can control the output flow more accurately.

Description

Diaphragm pump with adjustable water yield

Technical Field

The invention relates to the technical field of fluid conveying equipment, in particular to a diaphragm pump with an adjustable water yield.

Background

The diaphragm pump is widely applied in our daily life, the diaphragm pump has a simple structure, the current diaphragm pump mainly drives an eccentric part to rotate by a motor, the eccentric part drives a pushing frame to swing, and the pushing frame is connected with a pressure sensing diaphragm forming a pressurizing cavity, so that the volume of the pressurizing cavity can be enlarged or extruded, and water is sucked or pumped out.

When the conventional diaphragm pump is applied, after source water enters the diaphragm pump, after a motor of the diaphragm pump is started, the output flow of the diaphragm pump is larger, so that the conventional diaphragm pump cannot meet the requirements for some application scenes in which the output flow needs to be controlled accurately, and the output flow of the conventional diaphragm pump cannot be controlled accurately.

Disclosure of Invention

The invention aims to provide a diaphragm pump with adjustable water yield, which can control output flow more accurately.

In order to solve the technical problems, the invention adopts the following scheme:

the utility model provides a water yield adjustable diaphragm pump, includes the pump head body, is equipped with first inlet chamber, second inlet chamber, booster cavity, play water cavity in the pump head body, first inlet chamber, play water cavity respectively with water inlet, first delivery port switch-on, the second inlet chamber is through one-way rivers control structure and booster cavity switch-on, still be equipped with the second delivery port on the pump head body, be equipped with the adjusting part that adjusts the water flow through the displacement change on the water route that second delivery port and first delivery port switch-on.

By adopting the technical scheme, on the basis of the existing diaphragm pump, the adjusting component is arranged on the waterway with the first water outlet and the second water outlet communicated, source water enters the first water inlet cavity from the water inlet and enters the pressurizing cavity through the unidirectional water flow control structure, the pressurizing cavity pumps water out to the water outlet cavity after pressurizing and conveys the water to the first water outlet, the water outlet quantity pumped out by the pressurizing cavity is basically certain, the water pumping quantity is also larger, and finally, the output flow of the diaphragm pump is also certain, after the adjusting component is additionally arranged, the water outlet flow can be adjusted through the displacement change of the adjusting component, so that the water outlet flow can be controlled accurately, and the flow output of a certain quantity in unit time can be realized.

Further, the adjusting component comprises a mounting seat and an adjusting rod, the mounting seat and the pump head body are integrally formed, the second water outlet is formed in the mounting seat, a mounting cavity for assembling the adjusting rod and a flow through groove communicated with the first water outlet are formed in the mounting seat, the flow through area of the flow through groove is gradually changed along the length direction of the adjusting rod, and the flow through area of the flow through groove is changed by vertical movement of the adjusting rod.

Further, the water passing area of the overflow groove is gradually increased from top to bottom, the top end of the adjusting rod is matched with the top size of the overflow groove, the lower end of the adjusting rod is in threaded connection with the mounting cavity, the first sealing ring is circumferentially embedded at the upper end of the adjusting rod, and the second sealing ring is circumferentially embedded at the lower end of the adjusting rod.

Further, the vacuum valve seat is internally provided with a vacuum cavity, the vacuum cavity is communicated with the second water inlet cavity through a water inlet flow channel, and a water sealing sleeve ring and a flow control assembly for controlling water sealing or conduction at the water sealing sleeve ring are formed on a water channel communicated with the first water inlet cavity and the vacuum cavity.

Further, the flow control assembly comprises a control rod, a first spring and a first sensing diaphragm, the periphery of the first sensing diaphragm is fixed between the negative pressure valve seat and the valve cover in a sealing manner, and the first sensing diaphragm and the valve cover form a first air cavity; the side wall of the control rod is provided with a limiting groove, one end of the control rod is fixedly connected with the middle part of the first sensing diaphragm, and the other end of the control rod seals the water sealing lantern ring; the first spring is positioned in the vacuum cavity, one end of the first spring acts on the control rod, the other end of the first spring acts on the inner wall of the negative pressure valve seat, and the control rod forms a sealing water sealing sleeve ring or a flow control assembly for controlling the conduction of the water sealing sleeve ring under the combined action of the air pressure in the atmosphere cavity, the pressure in the vacuum cavity and the first spring.

Further, a water flow passage communicated with the water inlet and the first water inlet cavity is arranged in the middle of the control rod.

Further, the control rod upper end, lower extreme circumference are equipped with third sealing washer, fourth sealing washer, and the third sealing washer compresses tightly between valve gap and first support ring, and first support ring is connected with the valve gap bottom, and the fourth sealing washer compresses tightly between sealing the water lantern ring and second support ring, and second support ring is connected with the pump head internal wall.

Furthermore, the pump head is also provided with a reflux port communicated with the vacuum cavity, and a water channel communicated with the reflux port and the first water outlet is provided with a water sealing port and a reflux component for controlling the water channel at the water sealing port to be sealed or communicated.

Further, the backflow component comprises a second sensing diaphragm, a second spring, a conical plug and an outer cover, wherein the outer cover is connected with the pump head body in an adapting way, a second air cavity is formed between the outer cover and the pump head body, an air hole communicated with the second air cavity is formed in the side wall of the outer cover, the second sensing diaphragm is circumferentially pressed between the outer cover and the pump head body, one end of the conical plug is slidably arranged in a backflow port, the other end of the conical plug is integrally formed with the second sensing diaphragm, a pressing plate is fixed on the left side of the second sensing diaphragm, one end of the second spring acts on the inner wall of the outer cover, the other end of the second spring acts on the pressing plate, and the conical plug forms a backflow component for sealing a water sealing port or controlling the conduction of the water sealing port under the combined action of the air pressure in the second air cavity, the first water outlet and the second spring.

Further, the unidirectional water flow control structure comprises a water inlet unidirectional valve clack and a water outlet unidirectional valve clack, wherein the water inlet unidirectional valve clack is arranged on a waterway between the second water inlet cavity and the pressurizing cavity, and the water outlet unidirectional valve clack is arranged on the waterway between the pressurizing cavity and the water outlet cavity.

The invention has the beneficial effects that:

1. according to the invention, the water path in which the first water outlet and the second water outlet are communicated is provided with the regulating component, source water enters the first water inlet cavity from the water inlet, then enters the pressurizing cavity through the unidirectional water flow control structure, the pressurizing cavity pumps water out of the water outlet cavity and conveys the water to the first water outlet, the water output pumped by the pressurizing cavity is basically constant, the water output of the pump is larger, and finally the output flow of the diaphragm pump is also constant.

2. The middle part of the control rod is provided with a water flow passage for connecting a water way between the water inlet and the first water inlet cavity, so that the water pressure of the water inlet and the water pressure of the first water inlet cavity are the same, and the end surface areas of the upper end and the lower end of the control rod are the same, so that the water pressures of the water inlet and the first water inlet cavity act on the two ends of the control rod to be the same, but the directions are opposite, so that the water pressures can offset each other, the influence of the water pressure on the stability of the up-and-down movement of the control rod is avoided, and the control rod can be normally connected or blocked to the water way at the water sealing sleeve ring.

3. The water way in which the first water outlet is communicated with the reflux port is provided with the reflux component, so that water accumulated at the first water outlet can be refluxed to the vacuum cavity and returned to the pressurizing cavity again, and the condition that the excessive water pressure at the first water outlet affects the control of the regulating component on the water outlet flow is avoided.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Reference numerals: 01-water outlet one-way valve clack, 02-fourth sealing ring, 03-pressurizing cavity, 04-water inlet one-way valve clack, 05-second water inlet cavity, 06-second sealing ring, 07-adjusting rod, 08-installing cavity, 09-installing seat, 10-second water outlet, 11-first sealing ring, 12-pressing plate, 13-water sealing port, 14-second spring, 15-outer cover, 16-air hole, 17-second sensing diaphragm, 18-conical plug, 19-first water outlet, 20-first spring, 21-water sealing sleeve ring, 22-control rod, 23-first sensing diaphragm, 24-second pressing plate, 25-first supporting ring, 26-third sealing ring, 27-valve cover, 28-water inlet, 29-water passing flow passage, 30-vacuum cavity, 31-water limiting groove, 32-negative pressure valve seat, 33-water inlet flow passage, 34-second supporting ring, 35-first water inlet cavity, 36-water outlet cavity, 37-water passing groove, 38-pump head body, 39-water return port, 40-first large air cavity, 41-second large air cavity.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.

In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and for simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "configured," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Example 1

The utility model provides a diaphragm pump with adjustable water yield, includes pump head body 38, is equipped with first inlet chamber 35, second inlet chamber 05, booster chamber 03, play water cavity 36 in the pump head body 38, and first inlet chamber 35, play water cavity 36 are put through with water inlet 28, first delivery port 19 respectively, and second inlet chamber 05 is put through with booster chamber 03 through one-way rivers control structure, still be equipped with second delivery port 10 on the pump head body 38, be equipped with the adjusting part that adjusts the water flow through displacement change on the water route that second delivery port 10 was put through with first delivery port 19.

In this embodiment, as shown in fig. 1, the existing diaphragm pump has a first water inlet chamber 35, a second water inlet chamber 05, a pressurizing chamber 03, and a water outlet chamber 36, the unidirectional water flow control structure includes a water inlet unidirectional valve flap 04 and a water outlet unidirectional valve flap 01, the water inlet unidirectional valve flap 04 is installed on a waterway between the second water inlet chamber 05 and the pressurizing chamber 03, the water outlet unidirectional valve flap 01 is installed on a waterway between the pressurizing chamber 03 and the water outlet chamber 36, an adjusting component is disposed on a waterway where the first water outlet 19 and the second water outlet 10 are connected, source water enters the first water inlet chamber 35 from the water inlet 28, then enters the pressurizing chamber 03 through the unidirectional water flow control structure, the pressurizing chamber 03 pumps water out to the water outlet chamber 36 after being pressurized, and is conveyed to the first water outlet 19, the water outlet amount pumped out by the pressurizing chamber 03 is basically constant, and the water pumping amount is also larger, and finally the output flow of the diaphragm pump is also constant, after the adjusting component is additionally arranged, the water outlet flow can be adjusted by changing the displacement of the adjusting component, so that the output water flow can be controlled more accurately, and a certain flow output in unit time can be realized.

Preferably, the adjusting component comprises a mounting seat 09 and an adjusting rod 07, the mounting seat 09 and the pump head body 38 are integrally formed, the second water outlet 10 is arranged on the mounting seat 09, a mounting cavity 08 for assembling the adjusting rod 07 and a through-flow groove 37 communicated with the first water outlet 19 are arranged in the mounting seat 09, the water flow area of the through-flow groove 37 is gradually changed along the length direction of the adjusting rod 07, and the vertical movement of the adjusting rod 07 changes the water flow area of the through-flow groove 37.

Preferably, the water passing area of the overflow groove 37 is gradually increased from top to bottom, the top end of the adjusting rod 07 is matched with the top size of the overflow groove 37, the lower end of the adjusting rod 07 is in threaded connection with the mounting cavity 08, the first sealing ring 11 is circumferentially embedded at the upper end of the adjusting rod 07, and the second sealing ring 06 is circumferentially embedded at the lower end of the adjusting rod 07.

As shown in fig. 1, the specific working principle of the adjusting assembly is as follows: the adjusting component comprises a mounting seat 09 and an adjusting rod 07, the mounting seat 09 is arranged at the left side of a pump head body 38 and is integrally formed with the pump head body 38, a through-flow groove 37 and a mounting cavity 08 are arranged in the mounting seat 09, the through-flow groove 37 is positioned above the mounting cavity 08 and is in a connection state, the second water outlet 10 is positioned at the left end of the mounting seat 09 and is formed by extending the mounting seat 09 leftwards, the second water outlet 10 is communicated with the through-flow groove 37 and the mounting cavity 08, the adjusting rod 07 is in an inverted T-shaped structure, the diameter of the upper part of the adjusting rod 07 is smaller than the diameter of the lower part, an external thread is arranged on the side wall of the lower part of the adjusting rod 07, an internal thread matched with the external thread is arranged on the inner wall of the mounting cavity 08, the lower part of the adjusting rod 07 is matched with the size of the mounting cavity 08 and is in threaded connection with the mounting cavity 08, the upper part of the adjusting rod 07 is positioned in the through-flow groove 37, the size of the uppermost end of the adjusting rod 07 is matched with the size of the upper end of the through-flow groove 37, the upper end of the adjusting rod 07 is axially provided with a groove, a first sealing ring 11 is embedded in the groove, the lower part of the adjusting rod 07 is axially provided with a groove, a second sealing ring 06 is embedded in the groove, the second sealing ring 06 prevents water from leaking to the outside from a thread groove between the adjusting rod 07 and the inner wall of the installation cavity 08, the water passing area of the overflow groove 37 is gradually increased from top to bottom, when the flow of the second water outlet 10 needs to be accurately controlled, the adjusting rod 07 moves upwards or downwards by rotating the lower part of the adjusting rod 07 in a forward or reverse direction, when the adjusting rod 07 moves upwards, the gap between the first sealing ring 11 and the left side wall of the overflow groove 37 is gradually reduced, then the water output from the first water outlet 19 to the second water outlet 10 is smaller, when the adjusting rod 07 moves downwards, the gap between the first sealing ring 11 and the left side wall of the overflow groove 37 is gradually increased, then the water output from the first water outlet 19 to the second water outlet 10 is more, so that the upper part of the adjusting rod 07 moves up and down by rotating the adjusting rod 07, the water output of the second water outlet 10 is controlled more accurately, and the millimeter-level flow regulation output in unit time can be realized.

Example 2

Preferably, the vacuum valve further comprises a negative pressure valve seat 32, a vacuum cavity 30 is arranged in the negative pressure valve seat 32, the vacuum cavity 30 is communicated with the second water inlet cavity 05 through a water inlet flow channel 33, and a water sealing lantern ring 21 and a flow control assembly for controlling water path sealing or conduction at the water sealing sleeve ring 21 are formed on a water path communicated with the first water inlet cavity 35 and the vacuum cavity 30.

Preferably, the flow control assembly comprises a control rod 22, a first spring 20 and a first sensing diaphragm 23, wherein the periphery of the first sensing diaphragm 23 is fixed between a negative pressure valve seat 32 and a valve cover 27 in a sealing way, and the first sensing diaphragm 23 and the valve cover 27 form a first atmosphere chamber 40; the side wall of the control rod 22 is provided with a flow limiting groove 31, one end of the control rod 22 is fixedly connected with the middle part of the first sensing diaphragm 23 and is pressed and fixed through the second pressing plate 24, and the other end seals the water sealing lantern ring 21; the first spring 20 is located in the vacuum cavity 30, one end of the first spring acts on the control rod 22, the other end of the first spring acts on the inner wall of the negative pressure valve seat 32, and the control rod 22 forms a sealing water sealing lantern ring 21 or a flow control assembly for controlling the conduction of the water sealing lantern ring 21 under the combined action of the air pressure in the atmosphere cavity, the pressure in the vacuum cavity 30 and the first spring 20.

Preferably, the middle part of the control rod 22 is provided with a water flow passage 29 communicated with the water inlet 28 and the first water inlet cavity 35.

Preferably, the upper end and the lower end of the control rod 22 are circumferentially provided with a third sealing ring 26 and a fourth sealing ring 02, the third sealing ring 26 is tightly pressed between the valve cover 27 and the first supporting ring 25, the first supporting ring 25 is connected with the bottom of the valve cover 27, the fourth sealing ring 02 is tightly pressed between the water sealing lantern ring 21 and the second supporting ring 34, and the second supporting ring 34 is connected with the inner wall of the pump head body 38.

In this embodiment, as shown in fig. 1, when the diaphragm pump does not work, the sum of the pressure in the vacuum chamber 30 and the acting force of the elastic force of the first spring 20 on the first sensing diaphragm 23 is greater than the acting force of the air pressure in the first atmosphere chamber 40 on the first sensing diaphragm 23, and the control rod 22 seals the water sealing collar 21 under the combined action of the acting forces; when the diaphragm pump works, water flow or air in the vacuum cavity 30 is sucked away to form a certain vacuum degree, at this time, the sum of the pressure in the vacuum cavity 30 and the acting force of the elastic force of the first spring 20 on the first sensing diaphragm 23 is smaller than the acting force of the air pressure in the first atmosphere cavity 40 on the first sensing diaphragm 23, the control rod 22 moves downwards (the direction of the first water inlet cavity 35) under the combined action of the acting forces, the side wall of the control rod 22 is provided with the flow limiting groove 31, the lower end of the control rod 22 is provided with the flow limiting groove 31, the side wall above the lower end is provided with the flow limiting groove 31, the part of the lower end of the control rod 22, which is not provided with the flow limiting groove 31, moves downwards into the first water inlet cavity 35 completely, and then the first water inlet cavity 35 is communicated with the vacuum cavity 30 through the flow limiting groove 31 when continuing to move downwards. When the flow limiting groove 31 of the control rod 22 just moves down into the first water inlet cavity 35, at this time, the flow passage of the first water inlet cavity 35 communicated with the vacuum cavity 30 through the flow limiting groove 31 is smaller, the pumped flow rate of the diaphragm pump is smaller (larger than the output water amount at the adjusting component), if the control rod 22 continues to move down, the part of the control rod 22 with the flow limiting groove 31 moves down into the first water inlet cavity 35 for a longer distance, the flow passage area of the first water inlet cavity 35 communicated with the vacuum cavity 30 through the flow limiting groove 31 is increased, the pumped flow rate of the diaphragm pump is increased, the vacuum in the vacuum cavity 30 can be adjusted by adjusting the working voltage (power) of the diaphragm pump, and then the downward moving distance of the control rod 22 is adjusted, so that the function of adjusting the pumped flow rate of the diaphragm pump is achieved. Meanwhile, the middle part of the control rod 22 is provided with the water flow channel 29 for connecting the water channel between the water inlet 28 and the first water inlet cavity 35, so that the water pressure of the water inlet 28 and the first water inlet cavity 35 is the same, and the end surface areas of the upper end and the lower end of the control rod 22 are the same, so that the water pressures of the water inlet 28 and the first water inlet cavity 35 act on the two ends of the control rod 22 in the same direction, but opposite directions, so that the water pressures can offset each other, the influence of the water pressure on the stability of the up-and-down movement of the control rod 22 is avoided, and the control rod 22 can normally connect or block the water channel at the position of the water sealing lantern ring 21.

Example 3

Preferably, the pump head is further provided with a return port 39 communicated with the vacuum cavity 30, and a water channel communicated with the return port 39 and the first water outlet 19 is provided with a water sealing port 13 and a return component for controlling the water channel at the water sealing port 13 to be sealed or communicated.

Preferably, the backflow component comprises a second sensing diaphragm 17, a second spring 14, a conical plug 18 and an outer cover 15, the outer cover 15 is connected with the pump head body 38 in an adapting way, a second air cavity 41 is formed between the outer cover 15 and the pump head body 38, an air hole 16 communicated with the second air cavity 41 is formed in the side wall of the outer cover 15, the second sensing diaphragm 17 is circumferentially pressed between the outer cover 15 and the pump head body 38, one end of the conical plug 18 is slidably arranged in a backflow port 39, the other end of the conical plug is integrally formed with the second sensing diaphragm 17, a pressing plate 12 is fixed on the left side of the second sensing diaphragm 17, one end of the second spring 14 acts on the inner wall of the outer cover 15, the other end of the second spring acts on the pressing plate 12, and the conical plug 18 forms a backflow component for sealing the water sealing port 13 or controlling the conduction of the water sealing port 13 under the combined action of the first water outlet 19 and the second spring 14.

In this embodiment, as shown in fig. 1, a return assembly is arranged on a waterway where the first water outlet 19 is communicated with the return port 39, the second sensing diaphragm 17 is circumferentially pressed between the outer cover 15 and the pump head body 38, the return port 39 is formed by extending the pump head body 38 to the left, the conical plug 18 and the second sensing diaphragm 17 are integrally formed, the diameter left end of the conical plug 18 is large, the diameter right end of the conical plug 18 is small, when the water pressure pumped by the pressurizing cavity 03 is small, the sum of the pressure in the second atmosphere cavity 41 and the acting force of the second spring 14 on the second sensing diaphragm 17 is larger than the acting force of the water pressure at the first water outlet 19 on the second sensing diaphragm 17, and the conical plug 18 seals the water sealing port 13 under the combined action of the forces; if the voltage of the motor changes, so that when the water pressure pumped by the pressurizing cavity 03 is larger, the sum of the pressure in the second atmosphere cavity 41 and the acting force of the second spring 14 on the second sensing diaphragm 17 is smaller than the acting force of the water pressure at the first water outlet 19 on the second sensing diaphragm 17, the conical plug 18 moves leftwards (the direction of the second atmosphere cavity 41) under the combined action of the forces, at this time, a water channel is formed between the conical plug 18 and the inner wall of the backflow port 39, the waterway at the water sealing port 13 is conducted, if the water pressure at the first water outlet 19 is larger, the distance that the conical plug 18 moves leftwards is larger, the water channel area formed between the conical plug 18 and the inner wall of the backflow port 39 is larger, the water backflow to the vacuum cavity 30 is larger, the water pressure at the first water outlet 19 is smaller, and the control of the regulating assembly on the water flow can be effectively avoided from being influenced by the water pressure at the first water outlet 19.

The foregoing description of the preferred embodiment of the invention is not intended to limit the invention in any way, but rather to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the invention.

Claims (10)

1. The utility model provides a diaphragm pump with adjustable water yield, includes pump head body (38), is equipped with first inlet chamber (35), second inlet chamber (05), booster chamber (03), play water cavity (36) in pump head body (38), first inlet chamber (35), play water cavity (36) are put through with water inlet (28), first delivery port (19) respectively, second inlet chamber (05) are put through with booster chamber (03) through one-way rivers control structure, a serial communication port, still be equipped with second delivery port (10) on pump head body (38), be equipped with on the water route that second delivery port (10) and first delivery port (19) put through and adjust the regulation subassembly of water yield through the displacement change.

2. The diaphragm pump with adjustable water yield according to claim 1, characterized in that the adjusting component comprises a mounting seat (09) and an adjusting rod (07), the mounting seat (09) and a pump head body (38) are integrally formed, the second water outlet (10) is arranged on the mounting seat (09), a mounting cavity (08) for assembling the adjusting rod (07) and a through-flow groove (37) communicated with the first water outlet (19) are arranged in the mounting seat (09), the water flow area of the through-flow groove (37) is gradually changed along the length direction of the adjusting rod (07), and the vertical movement of the adjusting rod (07) changes the water flow area of the through-flow groove (37).

3. The diaphragm pump with the adjustable water yield according to claim 2, wherein the water passing area of the overflow groove (37) is gradually increased from top to bottom, the top end of the adjusting rod (07) is matched with the top size of the overflow groove (37), the lower end of the adjusting rod (07) is in threaded connection with the mounting cavity (08), the first sealing ring (11) is circumferentially embedded at the upper end of the adjusting rod (07), and the second sealing ring (06) is circumferentially embedded at the lower end of the adjusting rod.

4. The diaphragm pump with the adjustable water yield according to claim 1, further comprising a negative pressure valve seat (32), wherein a vacuum cavity (30) is arranged in the negative pressure valve seat (32), the vacuum cavity (30) is communicated with the second water inlet cavity (05) through a water inlet flow channel (33), and a water sealing sleeve ring (21) and a flow control assembly for controlling water path sealing or conduction at the water sealing sleeve ring (21) are formed on a water path communicated with the first water inlet cavity (35) and the vacuum cavity (30).

5. The diaphragm pump with adjustable water yield according to claim 4, wherein the flow control assembly comprises a control rod (22), a first spring (20) and a first sensing diaphragm (23), the periphery of the first sensing diaphragm (23) is fixed between a negative pressure valve seat (32) and a valve cover (27) in a sealing way, and the first sensing diaphragm (23) and the valve cover (27) form a first atmospheric chamber (40); a flow limiting groove (31) is arranged on the side wall of the control rod (22), one end of the control rod (22) is fixedly connected with the middle part of the first sensing diaphragm (23), and the other end of the control rod seals the water sealing lantern ring (21); the first spring (20) is positioned in the vacuum cavity (30), one end of the first spring acts on the control rod (22), the other end of the first spring acts on the inner wall of the negative pressure valve seat (32), and the control rod (22) forms a sealing water sealing lantern ring (21) or a flow control assembly for controlling the conduction of the water sealing lantern ring (21) under the combined action of the air pressure in the atmosphere cavity, the pressure in the vacuum cavity (30) and the first spring (20).

6. The diaphragm pump with adjustable water yield according to claim 5, wherein the middle part of the control rod (22) is provided with a water flow passage (29) communicated with the water inlet (28) and the first water inlet cavity (35).

7. The diaphragm pump with adjustable water yield according to claim 5, wherein a third sealing ring (26) and a fourth sealing ring (02) are circumferentially arranged at the upper end and the lower end of the control rod (22), the third sealing ring (26) is tightly pressed between the valve cover (27) and the first supporting ring (25), the first supporting ring (25) is connected with the bottom of the valve cover (27), the fourth sealing ring (02) is tightly pressed between the water sealing lantern ring (21) and the second supporting ring (34), and the second supporting ring (34) is connected with the inner wall of the pump head body (38).

8. The diaphragm pump with adjustable water yield according to claim 4, wherein the pump head is further provided with a reflux port (39) communicated with the vacuum cavity (30), and a water channel communicated with the reflux port (39) and the first water outlet (19) is provided with a water sealing port (13) and a reflux component for controlling water channel sealing or conduction at the water sealing port (13).

9. The diaphragm pump with adjustable water yield according to claim 8, wherein the backflow component comprises a second induction diaphragm (17), a second spring (14), a conical plug (18) and an outer cover (15), the outer cover (15) is connected with the pump head body (38) in an adapting way, a second atmosphere chamber (41) is formed between the outer cover (15) and the pump head body (38), an air hole (16) communicated with the second atmosphere chamber (41) is formed in the side wall of the outer cover (15), the second induction diaphragm (17) is circumferentially pressed between the outer cover (15) and the pump head body (38), one end of the conical plug (18) is slidably arranged in the backflow port (39), the other end of the conical plug is integrally formed with the second induction diaphragm (17), a pressing plate (12) is fixed on the left side of the second induction diaphragm (17), one end of the second spring (14) acts on the inner wall of the outer cover (15), the other end of the second spring acts on the pressing plate (12), and the conical plug (18) forms a sealing water gap (13) or controls the backflow component (13) to be conducted under the combined action of the first water outlet (19) and the second spring (14).

10. The diaphragm pump with adjustable water yield according to claim 1, wherein the unidirectional water flow control structure comprises a water inlet unidirectional valve clack (04) and a water outlet unidirectional valve clack (01), the water inlet unidirectional valve clack (04) is arranged on a waterway between the second water inlet cavity (05) and the pressurizing cavity (03), and the water outlet unidirectional valve clack (01) is arranged on the waterway between the pressurizing cavity (03) and the water outlet cavity (36).