CN107191363B

CN107191363B - Diaphragm pump

Info

Publication number: CN107191363B
Application number: CN201710645862.3A
Authority: CN
Inventors: 黄均城
Original assignee: Individual
Current assignee: Huang Juncheng
Priority date: 2017-08-01
Filing date: 2017-08-01
Publication date: 2020-03-17
Anticipated expiration: 2037-08-01
Also published as: CN107191363A

Abstract

The invention discloses a diaphragm pump which comprises a water inlet, a water outlet, a water sealing opening, a low-pressure cavity, a water outlet cavity, a sealing sleeve, a water cut-off assembly and a first water passing cavity communicated with the low-pressure cavity, wherein the upper opening end of the sealing sleeve is arranged in the first water passing cavity, and the lower opening end of the sealing sleeve is arranged in the low-pressure cavity or a second water passing cavity communicated with the first water passing cavity. The water break assembly comprises a control rod and two sealing rings sleeved on the control rod, the control rod penetrates through the first water cavity, the lower end of the control rod is embedded into the sealing sleeve, a water inlet cavity is formed among the control rod, the two sealing rings on the control rod and the sealing sleeve, and a water sealing opening is formed in the sealing sleeve and is located above or below the water inlet cavity. Two sealing rings on the control rod are respectively positioned on the upper side and the lower side of the water inlet cavity, the sealing ring which is positioned on the opposite side of the water inlet cavity with the water sealing port is in close contact with the inner wall of the sealing sleeve, and the sealing ring which is positioned on the same side of the water inlet cavity with the water sealing port is used for controlling the opening and closing of the water sealing port. When the invention is applied, the water sealing can be ensured to be tight when the water pressure of the source water is higher, and the vibration can be avoided or reduced.

Description

Diaphragm pump

Technical Field

The invention relates to a water flow on-off control assembly, in particular to a diaphragm pump.

Background

The household water purifier system is usually provided with a water cut-off device to control the on-off of a water path, and as one of a plurality of devices capable of realizing the water cut-off function, the diaphragm pump is widely applied to the household water purifier system. The existing diaphragm pump is generally provided with a low-pressure cavity, a water outlet cavity and a water inlet which are communicated with the low-pressure cavity, and a water outlet communicated with the water outlet cavity, wherein a water cut-off component for controlling the opening and closing of a water sealing opening is arranged on a channel communicated with the water inlet and the water outlet. When the water pressure of source water is large, the problems of large vibration, untight water sealing at a water sealing opening and the like easily occur to the conventional diaphragm pump, so that the application of the diaphragm pump on a household water purifier system is influenced to a certain extent.

Disclosure of Invention

The invention aims to solve the problems that the existing diaphragm pump is easy to have larger vibration and the water sealing at the water sealing opening is not tight when the water pressure of source water is larger, and provides a diaphragm pump which can ensure tight water sealing when the water pressure of the source water is larger and can avoid or reduce the vibration.

The purpose of the invention is mainly realized by the following technical scheme: a diaphragm pump comprises a water inlet, a water outlet, a low-pressure cavity and a water outlet cavity, wherein the low-pressure cavity and the water outlet cavity are sequentially arranged on a channel for connecting the water inlet and the water outlet, the channel for connecting the water inlet and the low-pressure cavity is also provided with a water sealing opening and a water cut-off component for controlling the channel between the water inlet and the low-pressure cavity to be switched between an on state and an off state by opening and closing the water sealing opening; the water-saving device also comprises a sealing sleeve and a first water passing cavity communicated with the low-pressure cavity, wherein the sealing sleeve is arranged perpendicular to the water inlet channel and communicated with the water inlet channel; the water cut-off assembly comprises a control rod and two sealing rings sleeved on the control rod, the control rod penetrates through the first water passing cavity, the lower end of the control rod is embedded into the sealing sleeve, a water inlet cavity is formed among the control rod, the two sealing rings on the control rod and a region, corresponding to the water inlet flow channel, of the inner wall of the sealing sleeve, and the water sealing port is arranged on the sealing sleeve and is positioned above or below the water inlet cavity; the two sealing rings on the control rod are respectively positioned at the upper side and the lower side of the water inlet cavity, the sealing ring which is positioned at the opposite side of the water inlet cavity with the water sealing port is in close contact with the inner wall of the sealing sleeve, and the sealing ring which is positioned at the same side of the water inlet cavity with the water sealing port is driven by the water-break component to move up and down to control the opening and closing of the water sealing port; two the seal in the seal area that the seal of top received water cavity internal water pressure effect correspond with the area phase-match that the seal of below received the seal cover down the internal water pressure effect of open end place cavity, two the seal in the seal area that the seal of top received water intracavity water pressure effect correspond with the area phase-match that the seal of below received water intracavity water pressure effect. The invention is sleeved in two sealing rings on the control rod, the sealing ring which is positioned on the opposite side of the water inlet cavity with the water sealing port is used as a sealing ring, and the sealing ring is always kept in close contact with the inner wall of the sealing sleeve in the process of vertical displacement of the control rod. The area that the upper seal of two seals received water cavity one interior water pressure effect corresponds specifically with the area phase-match that the lower seal received water pressure effect in the cavity of seal cover section of thick bamboo lower open end place: the area of the upper sealing ring in the two sealing rings under the action of water pressure in the water passing cavity is approximately equal to the area of the lower sealing ring under the action of water pressure in the cavity of the lower opening end of the sealing sleeve, namely the stressed areas of the upper sealing ring and the lower sealing ring are approximately equal, and the small difference is within the allowable processing error range. The area that the upper seal of two seals received the intracavity water pressure effect of intaking and the area phase-match that the lower seal received the intracavity water pressure effect of intaking correspond specifically to be: the area of the upper sealing ring in the two sealing rings under the action of the water pressure in the water inlet cavity is approximately equal to the area of the lower sealing ring under the action of the water pressure in the water inlet cavity, namely the stressed areas of the upper sealing ring and the lower sealing ring are approximately equal, and the small difference is within the allowable processing error range.

When the water pressure of source water is higher, the acting forces of the source water entering the water inlet cavity to the two sealing rings on the control rod are mutually offset, and because the cavity where the lower opening end of the sealing sleeve is positioned is communicated with the water passing cavity I, the acting force of the water pressure in the water passing cavity I on the upper sealing ring and the acting force of the water pressure in the cavity where the lower opening end of the sealing sleeve is positioned on the lower sealing ring are mutually offset. Therefore, the displacement of the control rod is not influenced by the water pressure of source water entering the water inlet cavity, and the control rod is not driven by the water pressure in the first water passing cavity and the cavity with the lower opening end of the sealing sleeve to displace.

As a first embodiment of the arrangement of the water sealing port, the water sealing port is an opening at the lower end of the sealing sleeve, the sealing ring with the lower relative position in the two sealing rings is a water sealing ring, the water sealing ring is embedded into a cavity where the opening at the lower end of the sealing sleeve is located when the water sealing ring unseals the water sealing port, and the water sealing ring is in sealing contact with the inner wall of the opening at the lower end of the sealing sleeve when the water sealing ring seals the water sealing port.

As a second embodiment of the arrangement of the water sealing port, the water sealing port is located at the top of the water inlet cavity, the sealing ring with the higher relative position in the two sealing rings is the water sealing ring, the water sealing ring is embedded into the water inlet cavity when the water sealing port is opened, and the water sealing ring is in sealing contact with the inner wall of the sealing sleeve and is located above the water sealing port when the water sealing port is closed.

The diaphragm pump comprises a pump body, wherein the low-pressure cavity, the water outlet cavity and the sealing sleeve are all formed by the pump body, the water cut-off assembly is arranged in the pump body, and the first water passing cavity is formed by separating the inner area of the pump body for the water cut-off assembly.

Further, the water inlet sets up on the control lever, the pump body is just located outside the pump body is passed to the control lever upper end. When the water inlet is specifically arranged, the water inlet is not limited to be arranged on the control rod, and the water inlet can be arranged on the pump body by adopting a conventional arrangement mode in the prior art.

Further, the pump body includes pump head body and upper cover, upper cover and pump head body top sealing connection and with constitute between the pump head body and have the holding cavity, the subassembly that cuts off the water supply separates this holding cavity and constitutes two upper and lower cavitys, the cavity of below is the cavity of crossing water one, the cavity of top is the atmospheric pressure chamber, the upper cover constitutes the air vent of switch-on atmospheric pressure chamber and external world.

Furthermore, the water cut-off assembly also comprises an air sealing diaphragm and a water sealing spring, the periphery of the air sealing diaphragm is hermetically fixed between the pump head body and the upper cover, and the first air pressure cavity and the first water passing cavity are formed by separating the air sealing diaphragm; the control rod protrudes outwards to form a top plate fixedly connected with the lower end face of the air sealing diaphragm, and the upper end and the lower end of the water sealing spring act on the lower end face of the top plate and the inner bottom of the water passing cavity respectively. When the invention is started, the low-pressure cavity is in a negative pressure state, the first water passing cavity communicated with the low-pressure cavity is also in a negative pressure state, the air pressure in the air pressure cavity overcomes the acting force of the water sealing spring on the air sealing diaphragm, the control rod is driven to move downwards, and the water sealing opening is not closed by the sealing ring any more; when the water seal device stops running, the internal pressure of the water passing cavity rises, when the internal pressure of the water passing cavity exceeds a set pressure value, the acting force of the water pressure in the water passing cavity and the water seal spring on the air seal diaphragm overcomes the acting force of the air pressure in the air pressure cavity on the air seal diaphragm, the control rod is driven to move upwards, and the control rod drives the seal ring to move upwards and finally seals the water seal port.

When the water sealing opening is positioned at the top of the water inlet cavity, the invention can also be arranged into the following structure: the sealing sleeve consists of an upper water sealing cylinder body and a lower water sealing cylinder body which are coaxially arranged and communicated with each other, and the inner diameter of the upper water sealing cylinder body is smaller than that of the lower water sealing cylinder body; the pump head body is connected with an inner sealing cover which is embedded into the lower water sealing cylinder body from the lower end of the lower water sealing cylinder body and is fixed in a sealing manner, the inner diameter of the inner sealing cover is equal to that of the upper water sealing cylinder body, the opening end of the inner sealing cover is upward, and the water inlet cavity is formed in the area between the opening end of the inner sealing cover and the bottom of the upper water sealing cylinder body; the water cut-off assembly also comprises an air sealing diaphragm and a water sealing spring, the periphery of the air sealing diaphragm is hermetically fixed between the pump head body and the upper cover, and the first air pressure cavity and the first water passing cavity are formed by separating the air sealing diaphragm; the upper end of the control rod is fixedly connected with the lower end face of the air sealing diaphragm, the lower end of the control rod is arranged in the inner sealing cover, and the upper end and the lower end of the water sealing spring respectively act on the end part of the lower end of the control rod and the inner bottom of the inner sealing cover. When the upper end and the lower end of the water sealing spring respectively act on the end part of the lower end of the control rod and the inner bottom of the inner sealing cover, the water sealing spring applies acting force to the control rod so as to transmit the acting force to the air sealing diaphragm.

In conclusion, the invention has the following beneficial effects: (1) the water-stop control device is simple in integral structure, convenient to implement and low in cost, two sealing rings are sleeved on the control rod, one sealing ring is used as a sealing ring and always kept in close contact with the inner wall of the sealing sleeve, the other sealing ring is used as a water-stop sealing ring and controls the opening and closing of the water-stop opening under the driving of the water-stop component driving the control rod to move up and down, the two sealing rings can be mutually offset under the action of the water pressure of source water entering the water inlet cavity, and the acting force of the water pressure in the first water-passing cavity of one sealing ring and the acting force of the water pressure in the cavity where the lower opening end of the sealing sleeve is located. Therefore, the invention can avoid the influence on the water sealing performance of the invention when the water pressure of the source water is overlarge, ensure the tightness of the water sealing, and avoid or reduce the vibration, so that the invention is more convenient to popularize and apply when being applied.

(2) The sealing ring is used as a sealing ring to be always kept in close contact with the inner wall of the sealing sleeve, so that the aim of slowing down the movement of the control rod can be fulfilled in the process of up-and-down displacement of the control rod, and the vibration caused by the fact that the water cut-off assembly quickly opens or closes the water sealing opening can be avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic sectional view showing the structure of embodiment 1 of the present invention;

FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1;

FIG. 3 is a schematic sectional view showing embodiment 2 of the present invention;

FIG. 4 is a schematic sectional view showing embodiment 3 of the present invention;

FIG. 5 is a schematic sectional view showing embodiment 4 of the present invention;

fig. 6 is a schematic cross-sectional structure diagram of embodiment 5 of the present invention.

Reference numbers and corresponding part names in the drawings: 01. 02, a first water inlet flow passage, 03, a pump head body, 04, a first water sealing spring, 05, a first control rod, 06, a vent hole, 07, an upper cover, 08, a first air sealing diaphragm 09, a pneumatic cavity, 10, a first water passing cavity, 11, a first sealing ring, 12, a first water inlet cavity, 13, a first water passing flow passage, 14, a water outlet, 15, a first water sealing ring, 16, a water outlet cavity, 17, a first inner sealing cover, 18, a first water sealing port, 19, a second water passing cavity, 20, a sealing ring of the water outlet cavity, 21, a low pressure cavity, 22, a second water inlet flow passage, 23, a top plate, 24, a second water passing flow passage, 25, a first sealing sleeve, 26, a diaphragm pressing plate, 27, a second control rod, 28, a second water inlet cavity, 29, a second air sealing diaphragm, 30, a third water passing flow passage, 31, a second water sealing port, 32, a second water sealing ring, 33, a second sealing ring, 34, a second sealing sleeve, 35, a third control rod, 36, a third water sealing port, 37 and, 38. the water seal device comprises a second inner sealing cover 39, a fifth water flow passage 40, a second water seal spring 41, a third sealing ring 42, a fourth control rod 43, a third water seal ring 43.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

Example 1:

as shown in fig. 1 and 2, a diaphragm pump includes a pump body and a water cut-off assembly disposed in the pump body, wherein the pump body includes a pump body 03, an upper cover 07 and an inner gland 17, the upper cover 07 is connected to the top of the pump body 03 in a sealing manner and forms an accommodating cavity with the pump body 03, the water cut-off assembly separates the accommodating cavity to form an upper cavity and a lower cavity, the lower cavity is a first water passing cavity 10, the upper cavity is a pneumatic cavity 09, and the upper cover 07 forms a vent 06 communicating the pneumatic cavity 09 with the outside. The pump head body 03 of this embodiment includes a water inlet 01, a water outlet 14, a first sealing sleeve 25, and a first water inlet channel 02, a second water inlet channel 22, a low pressure chamber 21, and a water outlet chamber 16 sequentially disposed on a communication path from the water inlet 01 to the water outlet 14, wherein the water outlet chamber 16 and the low pressure chamber 21 of this embodiment are formed by separating a water outlet chamber sealing ring 20 formed by the pump head body 03. In the embodiment, the first inner gland 17 is connected with the pump head body 03, and a second water passing cavity 19 is formed between the first inner gland and the pump head body 03, the second water passing cavity 19 is arranged right below the first water passing cavity 10, the second water passing cavity 19 is communicated with the first water passing cavity 10 through a first water passing flow channel 13 formed by the pump head body 03, and the first water passing cavity 10 is communicated with the low pressure cavity 21 through a second water passing flow channel 24 formed by the pump head body 03. The channel for connecting the water inlet 01 and the low-pressure cavity 21 is also provided with a water sealing opening I18, and the water cut-off assembly controls the channel between the water inlet 01 and the low-pressure cavity 21 to be switched between an on state and an off state by opening and closing the water sealing opening I18.

The first sealing sleeve 25 of the present embodiment is perpendicular to the second inlet channel 24 and is connected to the second inlet channel 24, and the portion of the first sealing sleeve 25 connected to the second inlet channel 24 is located on the sidewall thereof. The upper opening end of the first sealing sleeve 25 is arranged in the first water passing cavity 10, and the lower opening end of the first sealing sleeve is arranged in the second water passing cavity 19. The water-break assembly of this embodiment includes that control lever one 05 and cover establish seal ring one 11 and a water seal ring one 15 on control lever one 05, seal water seal ring one 15 and locate under seal ring one 11, control lever one 05 passes water cavity one 10 and its lower extreme embedding seal sleeve one 25 in, control lever one 05, seal ring one 11, seal water seal ring one 15 and seal sleeve one 25 inner walls are formed with intake antrum one 12 between the region that corresponds intake runner two 24, the water mouth one 18 that seals of this embodiment is the opening of a 25 lower extremes of seal sleeve. The sealing washer of this embodiment 11 is located intake antrum one 12 upsides and with a sealed sleeve 25 inner walls in close contact with, seals one 15 water seal rings and locates intake antrum one 12 downside, seals one 15 water seal rings and carries out opening and close control to a water sealing mouth 18 under the drive of the subassembly drive control pole that cuts off the water supply and shift from top to bottom at the water-break component drive control pole one 05. The area that sealing washer 11 of this embodiment received the water pressure effect in water cavity one 10 corresponds with the area phase-match that seals water seal ring 15 and receive the water pressure effect in water cavity two 19, and sealing washer 11 and seal water seal ring 15 both receive the area phase-match that the water pressure effect in intake antrum one 12 and correspond.

The water cut-off assembly of the embodiment further comprises a first air sealing diaphragm 08 and a first water sealing spring 04, the periphery of the first air sealing diaphragm 08 of the embodiment is hermetically fixed between the pump head body 03 and the upper cover 07, and the first air pressure cavity 9 and the first water passing cavity 10 are formed by separating the first air sealing diaphragm 08. The top of the control rod I05 of the embodiment protrudes outwards to form a top plate 23 fixedly connected with the lower end face of the air sealing diaphragm I08, and the upper end and the lower end of the water sealing spring I04 act on the lower end face of the top plate 23 and the inner bottom of the water passing cavity I10 respectively.

In the specific application of the embodiment, the first water sealing ring 15 is embedded into the second water passing cavity 19 when the first unsealing nozzle 18 is opened, and the first water sealing ring 15 is in close contact with the inner wall of the opening at the lower end of the first sealing sleeve 25 when the first unsealing nozzle 18 is closed.

Example 2:

as shown in fig. 3, the present embodiment is different from embodiment 1 in that: in the embodiment, a control rod II 27 is adopted to replace a control rod I05 in the embodiment 1, and an air sealing diaphragm II 29 is adopted to replace an air sealing diaphragm I08 in the embodiment 1. The second control rod 27 of the present embodiment has a structure different from the first control rod 05, the top plate 23 is formed by the protruding side wall of the second control rod 27, and the upper end of the second control rod 27 passes through the second air-sealing diaphragm 29, the air pressure chamber 09 and the air vent 06 in sequence and then is disposed outside the pump body. In this embodiment, the water inlet 01, the first water inlet channel 02 and the second water inlet channel 22 are not arranged on the pump head body 03, the water inlet 01 is arranged at the top of the second control rod 27, and the first water inlet channel 02 and the second water inlet channel 22 are also arranged on the second control rod 27. In the embodiment, the second water inlet cavity 28 is formed between the second control rod 27, the first sealing ring 11, the first water sealing ring 15 and the area of the inner wall of the first sealing sleeve 25 corresponding to the second water inlet flow channel 24. The water cut-off assembly of the embodiment further comprises a diaphragm pressing plate 26 which is arranged in the air pressure cavity 09 and fixedly connected with the upper end face of the second air sealing diaphragm 29, and the second control rod 27 penetrates through the diaphragm pressing plate 26.

Example 3:

as shown in fig. 4, the present embodiment is different from embodiment 1 in that: in this embodiment, the second water passing cavity 19 described in embodiment 1 is not provided, the first control rod 05 of this embodiment is provided with a third water passing channel 30, the first water passing cavity 10 and the second water passing cavity 19 are communicated through the third water passing channel 30, and the lower opening end of the first sealing sleeve 25 of this embodiment is arranged in the low pressure cavity 21.

Example 4:

as shown in fig. 5, the present embodiment is different from embodiment 3 in that: the water sealing port of this embodiment is a second water sealing port 31 formed at the top of the first water inlet cavity 12, and the sealing sleeve of this embodiment is a second sealing sleeve 34. In this embodiment, the two sealing rings sleeved on the first control rod 05 are a second water sealing ring 32 disposed on the upper side of the first water inlet cavity 12 and a second sealing ring 33 disposed on the lower side of the first water inlet cavity 12.

When the water sealing ring II 32 is used in the embodiment, the water sealing ring II 32 is embedded into the water inlet cavity I12 when the water opening II 31 is opened, and the water sealing ring II 32 is in close contact with the inner wall of the sealing sleeve II 34 and is positioned above the water opening II 31 when the water opening II 31 is closed.

Example 5:

as shown in fig. 6, the present embodiment is different from embodiment 4 in that: the sealing sleeve of this embodiment is two coaxial settings about and the water sealing barrel that communicates each other constitutes, and wherein, the internal diameter of going up the water sealing barrel is less than the internal diameter of water sealing barrel down. The pump head body 03 of the embodiment is connected with the second inner sealing cover 38 which is embedded into the lower water sealing cylinder body from the lower end of the lower water sealing cylinder body and is fixed in a sealing manner, the inner diameter of the second inner sealing cover 38 is equal to that of the upper water sealing cylinder body, the open end of the second inner sealing cover 38 faces upwards, and the water inlet cavity is formed in the area between the open end of the second inner sealing cover 38 and the bottom of the upper water sealing cylinder body. The control rod of the embodiment comprises a third control rod 35 fixedly connected with the lower end face of the air sealing diaphragm and a fourth control rod 42 with the upper end supported at the lower end of the third control rod 35, and the lower end of the fourth control rod 42 is arranged in the second inner sealing cover 38. In this embodiment, the first water sealing spring 04 in embodiment 4 is replaced by a second water sealing spring 40, the upper end and the lower end of the second water sealing spring 40 respectively act on the end part of the lower end of the control rod four and the inner bottom of the second inner sealing cover 38, the second inner sealing cover 38 forms a fifth water passing flow channel 39 which connects the cavity in which the second water sealing spring 40 is accommodated and the low pressure cavity 21, the fourth control rod 42 forms a fourth water passing flow channel 37, and the first water passing cavity 10 is connected with the low pressure cavity 21 sequentially through the fourth water passing flow channel 37 and the fifth water passing flow channel 39. In this embodiment, the two sealing rings sleeved on the control rod are specifically sleeved on the control rod four, namely a sealing ring three 41 and a water sealing ring three 43 arranged above the sealing ring 41.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A diaphragm pump comprises a water inlet (01), a water outlet (14), and a low-pressure cavity (21) and a water outlet cavity (16) which are sequentially arranged on a communication channel from the water inlet (01) to the water outlet (14), wherein a water sealing opening and a water cut-off assembly for controlling the channel between the water inlet (01) and the low-pressure cavity (21) to be switched between an on state and an off state by opening and closing the water sealing opening are also arranged on the communication channel between the water inlet (01) and the low-pressure cavity (21); the water-saving device is characterized by also comprising a sealing sleeve and a first water passing cavity (10) communicated with the low-pressure cavity (21), wherein the sealing sleeve is arranged perpendicular to the water inlet flow channel and communicated with the water inlet flow channel, the upper opening end of the sealing sleeve is arranged in the first water passing cavity (10), and the lower opening end of the sealing sleeve is arranged in the low-pressure cavity (21) or a second water passing cavity (19) communicated with the first water passing cavity (10); the water cut-off assembly comprises a control rod and two sealing rings sleeved on the control rod, the control rod penetrates through the first water passing cavity (10) and the lower end of the control rod is embedded into the sealing sleeve, a water inlet cavity is formed among the control rod, the two sealing rings on the control rod and a region, corresponding to the water inlet runner, of the inner wall of the sealing sleeve, and the water sealing port is arranged on the sealing sleeve and is positioned above or below the water inlet cavity; the two sealing rings on the control rod are respectively positioned at the upper side and the lower side of the water inlet cavity, the sealing ring which is positioned at the opposite side of the water inlet cavity with the water sealing port is in close contact with the inner wall of the sealing sleeve, and the sealing ring which is positioned at the same side of the water inlet cavity with the water sealing port is driven by the water-break component to move up and down to control the opening and closing of the water sealing port; two the seal in the seal area that the seal received water cavity (10) internal water pressure effect and below seal receive seal cover under the area phase-match of open end place internal water pressure effect correspond, two the seal in the seal area that the seal received water intracavity water pressure effect and below seal receive the area phase-match of water intracavity water pressure effect and correspond.

2. A diaphragm pump according to claim 1, wherein the water sealing opening is an opening at the lower end of the sealing sleeve, the sealing ring which is relatively lower in the two sealing rings is a water sealing ring, the water sealing ring is embedded in the cavity where the opening at the lower end of the sealing sleeve is located when the water sealing ring unseals the water sealing opening, and the water sealing ring is in sealing contact with the inner wall of the opening at the lower end of the sealing sleeve when the water sealing ring seals the water sealing opening.

3. The diaphragm pump of claim 1 wherein the water seal is located at the top of the water inlet chamber, the higher of the two seal rings is the water seal, the water seal is embedded into the water inlet chamber when the water seal is opened, and the water seal is in sealing contact with the inner wall of the sealing sleeve and located above the water seal when the water seal is closed.

4. The diaphragm pump according to any of claims 1-3, comprising a pump body, wherein the low pressure chamber (21), the water outlet chamber (16) and the sealing sleeve are all formed by the pump body, the water cut-off assembly is disposed in the pump body, and the first water passing chamber (10) is formed by the water cut-off assembly separating the inner area of the pump body.

5. A membrane pump according to claim 4, characterized in that the water inlet (01) is arranged on a control rod, which passes through the pump body at its upper end and is arranged outside the pump body.

6. The diaphragm pump according to claim 4, wherein the pump body comprises a pump body (03) and an upper cover (07), the upper cover (07) is connected with the top of the pump body (03) in a sealing manner, an accommodating cavity is formed between the upper cover and the pump body (03), the water cut-off assembly separates the accommodating cavity to form an upper cavity and a lower cavity, the lower cavity is a first water passing cavity (10), the upper cavity is a pneumatic cavity (09), and the upper cover (07) is provided with a vent (06) for communicating the pneumatic cavity (09) with the outside.

7. A diaphragm pump according to claim 6, characterized in that the water cut-off assembly further comprises an air-sealing diaphragm and a water-sealing spring, the air-sealing diaphragm is fixed between the pump head body (03) and the upper cover (07) in a sealing way, and the first air pressure chamber (09) and the first water passing chamber (10) are formed by separating the air-sealing diaphragm; the control rod protrudes outwards to form a top plate (23) fixedly connected with the lower end face of the air sealing diaphragm, and the upper end and the lower end of the water sealing spring act on the lower end face of the top plate (23) and the inner bottom of the water passing cavity I (10) respectively.

8. The diaphragm pump according to claim 6, wherein when the water seal port is located at the top of the water inlet cavity, the sealing sleeve is composed of an upper water sealing cylinder body and a lower water sealing cylinder body which are coaxially arranged and communicated with each other, and the inner diameter of the upper water sealing cylinder body is smaller than that of the lower water sealing cylinder body; the pump head body (03) is connected with an inner sealing cover which is embedded into the lower water sealing cylinder body from the lower end of the lower water sealing cylinder body and is fixed in a sealing manner, the inner diameter of the inner sealing cover is equal to that of the upper water sealing cylinder body, the open end of the inner sealing cover faces upwards, and the water inlet cavity is formed in the area between the open end of the inner sealing cover and the bottom of the upper water sealing cylinder body; the water cut-off assembly also comprises an air sealing diaphragm and a water sealing spring, the periphery of the air sealing diaphragm is hermetically fixed between the pump head body (03) and the upper cover (07), and the air pressure cavity (09) and the first water passing cavity (10) are formed by separating the air sealing diaphragm; the upper end of the control rod is fixedly connected with the lower end face of the air sealing diaphragm, the lower end of the control rod is arranged in the inner sealing cover, and the upper end and the lower end of the water sealing spring respectively act on the end part of the lower end of the control rod and the inner bottom of the inner sealing cover.