A flow control valve and a purifying drinking machine system constituted thereby

Abstract

The present invention discloses a flow control valve and a pure water drinking system composed thereof, which includes a valve body, a valve cover and an end cover. A water return port is provided on the valve body, and a water inlet and a water inlet cavity communicating with the water inlet are provided on the end cover. A water outlet is provided on the valve cover. A pressure maintaining cavity communicating with the water inlet cavity is formed between the end cover and the valve body. A pressure reducing component for controlling the water pressure at the water outlet is provided on the water path where the water inlet cavity communicates with the water outlet. A pressure maintaining structure is provided on the water path where the water inlet cavity communicates with the water return port, and the pressure maintaining structure is preset with a pressure maintaining value. When the flow control valve operates normally, the water pressure value at the water inlet cavity is greater than the pressure maintaining value of the pressure maintaining structure. At this time, the pressure maintaining cavity and the water return port are in a conducting state. A flow cut-off component for controlling the on-off of the water flow at the water return port is provided in the cavity where the water outlet and the water return port communicate. When the flow control valve stops operating, the water return port is in a closed state. The present invention can effectively avoid the continuous start and stop of the high-pressure switch during the use of the pure water drinking machine system, ensure the normal operation of the system, and at the same time, the excess water can also flow back.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid transportation, and particularly relates to a flow control valve and a water purifying and drinking machine system composed thereof. Background Art

[0002] With the development of the economy, the trend of deteriorating water resources has emerged in many places. Water resource shortage and pollution are becoming more and more serious, and the drinking water safety problem of urban residents has become prominent. Aiming at the secondary pollution problem of urban tap water and the harmful substances remaining in tap water due to source water pollution, more and more household pure water machines with reverse osmosis membranes as the core filtration units have entered thousands of households. The existing household pure water machines use reverse osmosis membranes as the core filtration units. After multi-stage pretreatment and pressurization of tap water, they then enter the reverse osmosis membrane unit, and the produced pure water can fully meet the living drinking water standards of developed countries.

[0003] With the progress of the water dispenser industry, it is necessary to achieve a water volume balance between instant heating and large-capacity water production. The current problem is mainly that the amount of hot water used is much less than the water production volume. Therefore, it is easy to generate backpressure at the water purification end, causing the water pressure at the water purification end to rise and exceed the pressure operating value of the high-pressure switch, resulting in the high-pressure switch closing and the water purifying and drinking machine stopping. As the water volume at the water outlet continues to be output, the water pressure at the water purification end decreases again, and the high-pressure switch opens again. In this way, it is easy to cause the high-pressure switch to start and stop continuously, easily causing damage to the high-pressure switch and generating a lot of noise at the same time. Summary of the Invention

[0004] The purpose of the present invention is to provide a flow control valve and a water purifying and drinking machine system composed thereof, which can effectively avoid the continuous start and stop of the high-pressure switch during the use of the water purifying and drinking machine system, ensure the normal operation of the system, and at the same time, the excess water can be recycled for reuse.

[0005] To solve the above technical problems, the present invention adopts the following solutions:

[0006] A flow control valve includes a valve body, a valve cover, and an end cover. A water return port is provided on the valve body, an inlet port and an inlet cavity communicating with the inlet port are provided on the end cover, an outlet port is provided on the valve cover, a pressure maintaining cavity communicating with the inlet cavity is formed between the end cover and the valve body. A pressure reducing component for controlling the water pressure at the outlet port is provided on the water path connecting the inlet cavity and the outlet port. A pressure maintaining structure for maintaining the water pressure in the inlet cavity is provided on the water path connecting the inlet cavity and the water return port. The pressure maintaining structure presets a pressure maintaining value. When the flow control valve operates normally, the water pressure value at the inlet cavity is greater than the pressure maintaining value of the pressure maintaining structure. At this time, the pressure maintaining cavity and the water return port are in a conducting state. A cut-off component for controlling the on-off of the water flow at the water return port is provided on the water path connecting the outlet port and the water return port. When the flow control valve stops, the water return port is in a closed state.

[0007] When the water supply of the heating unit stops in this solution, the water pressure at the water outlet increases, causing the pressure reducing component and the water cut-off component to act. The amount of water flowing from the water inlet cavity to the water outlet gradually decreases, and the water cut-off component gradually moves downward, causing the flow rate of the water return port to gradually decrease until it is blocked. As a result, the water pressure in the water inlet cavity increases and exceeds the preset value of the high-pressure switch, causing the high-pressure switch to stop and the entire water purifier system to stop. When the heating unit starts to use water, the water pressure at the water outlet decreases, and the pressure reducing component moves in the reverse direction, increasing the amount of water flowing into the water outlet. At the same time, the water cut-off component moves upward, opening the water return port. When the water pressure in the water inlet cavity is greater than the pressure maintaining value of the pressure maintaining structure, the water in the pressure maintaining cavity enters the water return port for circulating water return, and at the same time, the water pressure in the water inlet cavity is also reduced, preventing pressure buildup and avoiding the continuous start-stop state of the high-pressure switch during the operation of the water purifier system. Through the cooperation of the pressure reducing component, the water cut-off component, and the pressure maintaining structure, the water pressure value in the water inlet cavity does not exceed the pressure value of the high-pressure switch during operation.

[0008] Preferably, the pressure reducing component includes a first pressure sensing plate, a first spring, a sealing gasket, a partition plate, and a bracket. The partition plate is tightly sealed and matched in the valve body. The sealing gasket and the bracket are sequentially pressed between the end cover and the partition plate. A first air cavity is formed between the first pressure sensing plate and the partition plate. The valve body and the partition plate are provided with a first air hole for conducting the first air cavity. The bracket body is provided with a first flow channel connecting to the water inlet cavity. The middle position of the first pressure sensing plate is provided with a second flow channel connecting to the first flow channel. The valve body is provided with a third flow channel for conducting the second flow channel and the water outlet. One end of the first spring acts on the sealing gasket, and the other end acts on the inner wall of the first pressure sensing plate. A first sealing ring is tightly sealed between the bracket and the partition plate and is located circumferentially around the first pressure sensing plate. The first sealing ring does not move with the first pressure sensing plate. The first pressure sensing plate moves left and right under the combined action of the water pressure at the water outlet, the first spring, and the pressure in the first air cavity to form a pressure reducing component for controlling the water pressure value at the water outlet.

[0009] In this solution, when the water outlet stops, the water volume at the water outlet increases and the pressure rises. The water pressure at the water inlet acts on the first pressure-sensitive plate through the third flow channel. The third flow channel is connected to the water inlet cavity through the second flow channel and the first flow channel. Under the action of the water pressure at the water outlet, the first pressure-sensitive plate moves to the left, overcoming the elastic force of the first spring and the air pressure in the first air cavity, causing the water volume flowing from the first flow channel into the second flow channel to gradually decrease. When the left end of the first pressure-sensitive plate contacts the gasket, the water flow between the first flow channel and the third flow channel is restricted to the greatest extent, and the water pressure reaches the maximum. At this time, the water pressure at the water outlet continuously presses down the water cut-off assembly until the water cut-off assembly blocks the water return port. When the water pressure value in the water inlet cavity exceeds the preset value of the high-pressure switch, the high-pressure switch stops and the water purification machine system stops. When the water outlet is opened, the water pressure at the water outlet decreases. When the water pressure value at the water outlet is not sufficient to overcome the elastic force of the first spring and the air pressure in the first air cavity, the first pressure-sensitive plate moves to the left, and the amount of purified water in the water inlet cavity flowing into the second flow channel through the first flow channel increases, and the water pressure in the water inlet cavity decreases. At the same time, the water cut-off assembly moves upward, the water return port opens, and the excess water in the water inlet cavity enters the water return port through the pressure-holding structure for recycling. In this way, during the operation of the water purification machine system, the water pressure in the water inlet cavity will not exceed the preset value of the high-pressure switch, so that the high-pressure switch will not be continuously started and stopped, ensuring the normal operation of the water purification machine system.

[0010] Preferably, the pressure-holding structure includes a second pressure-sensitive plate and a second spring. In the valve body, there are a first water return flow channel and a second water return flow channel formed by the valve body itself and connected to the water return port. The second pressure-sensitive plate is located in the pressure-holding cavity. The second pressure-sensitive plate and the inner wall of the end cover form a second air cavity. The end cover is provided with a second air hole connected to the second air cavity. The second spring is located in the second air cavity and acts on the inner wall of the end cover at one end and the side wall of the second pressure-sensitive plate at the other end. In the valve body, there is a flow restriction groove formed by the valve body itself. The second pressure-sensitive plate moves left and right under the combined action of the second spring, the air pressure in the second air cavity, and the pressure in the water inlet cavity to form a pressure-holding structure for controlling the on-off of the water flow between the pressure-holding cavity and the first water return flow channel.

[0011] In this solution, when the water purification machine is running, since the preset value of the pressure-holding structure is less than the water pressure value in the water inlet cavity, the water pressure in the water inlet cavity can overcome the elastic force of the second spring and the inner air pressure of the second air cavity, and the second pressure-sensitive plate moves from the right end to the left beyond the position of the flow restriction groove, causing the pressure-holding cavity to be connected to the first water return flow channel. In this way, the excess water in the water inlet cavity enters the first water return flow channel and the second water return flow channel from the pressure-holding cavity, and then is recycled through the water return port. In this way, during the operation of the water purification machine system, the water pressure in the water inlet cavity will never exceed the preset value of the high-pressure switch, so that the high-pressure switch will not be continuously started and stopped, ensuring the normal operation of the water purification machine system.

[0012] Preferably, a through third return water flow channel is provided in the middle of the second pressure-sensitive plate, and the third return water flow channel is connected to the first return water flow channel. The third return water flow channel can effectively prevent the end of the second pressure-sensitive plate under the water pressure in the first return water flow channel, so that the return water will not affect the pressure-holding value of the pressure-holding structure.

[0013] Preferably, the flow cutoff assembly includes a third pressure-sensitive plate, a pressure plate, a third spring and a third sealing ring. An outlet water cavity communicated with the water outlet is provided on the third pressure-sensitive plate. A control rod is provided at the lower end of the third pressure-sensitive plate. The third sealing ring is sleeved on the circumferential direction of the upper end of the third pressure-sensitive plate and moves with the third pressure-sensitive plate. The circumferential direction of the upper end of the third pressure-sensitive plate is closely attached to the inner wall of the valve body. The pressure plate is hermetically sleeved on the third pressure-sensitive plate and is clamped with the valve body. The pressure plate, the third pressure-sensitive plate and the inner wall of the lower sleeve of the valve cover form a third atmosphere cavity. A third air hole communicating with the external atmosphere and the third atmosphere cavity is provided on the pressure plate. The third spring is located in the third atmosphere cavity and acts on the third pressure-sensitive plate at one end and on the pressure plate at the other end. A sealing plug is fixed at the bottom end of the control rod. The third pressure-sensitive plate moves up and down under the combined action of the water pressure in the outlet water cavity, the air pressure in the third atmosphere cavity and the third spring to form a flow cutoff assembly for controlling the on-off of the water flow at the return water port.

[0014] In this solution, when the water outlet is closed, the water flow in the outlet water cavity is blocked, resulting in water pressure buildup, and the water pressure value in the outlet water cavity increases. At this time, the water pressure value in the outlet water cavity overcomes the elastic force of the first spring and the pressure in the first atmosphere cavity. The water pressure acts on the first pressure-sensitive plate and drives it to move leftward, thereby restricting the flow rate of the water entering the outlet water cavity from the first flow channel. At the same time, the water pressure in the inlet water cavity also overcomes the elastic force of the third spring and the air pressure in the third atmosphere cavity, causing the third pressure-sensitive plate to move downward until the lower end of the third pressure-sensitive plate closes the return water port; when the water outlet is opened, the water volume in the inlet water cavity decreases, and its water pressure value decreases, making the water pressure in the outlet water cavity insufficient to overcome the elastic force of the first spring and the pressure in the first atmosphere cavity, the elastic force of the third spring and the air pressure in the third atmosphere cavity. The first pressure-sensitive plate moves rightward, and the water volume entering the outlet water cavity from the first flow channel increases to ensure that the pressure and water volume in the outlet water cavity can ensure the normal operation of the pure water dispenser system. At the same time, the third pressure-sensitive plate moves upward, the return water port opens, and the excess water in the inlet water cavity enters the return water port through the pressure-holding structure for recycling. At this time, the water pressure value in the inlet water cavity is reduced. At the same time, the upward movement of the third pressure-sensitive plate enables a relatively long vertical pipeline to be appropriately connected at the water outlet and can also ensure the water supply.

[0015] Preferably, a second sealing ring is sleeved on the circumference of the partition plate and is tightly sealed between the partition plate and the inner wall of the valve body, and a fourth sealing ring is tightly sealed between the right end of the partition plate and the inner wall of the valve body.

[0016] Preferably, the second pressure-sensitive plate is cross-shaped. A fifth sealing ring is provided between the second pressure-sensitive plate and the inner wall of the end cover forming the second air cavity. The fifth sealing ring is sleeved on the circumference of the vertical part of the second pressure-sensitive plate. The sixth sealing ring and the seventh sealing ring are respectively sleeved on both sides of the horizontal part of the second pressure-sensitive plate. The sixth sealing ring is circumferentially pressed between the second pressure-sensitive plate and the inner wall of the end cover, and the seventh sealing ring is circumferentially pressed between the second pressure-sensitive plate and the inner wall of the first water return channel.

[0017] Preferably, an eighth sealing ring is provided between the pressure-sensitive plate and the valve body main body forming the second water return channel. The eighth sealing ring is located on the lower side surface of the third pressure-sensitive plate. A ninth sealing ring is provided between the pressure-sensitive plate and the valve body. The ninth sealing ring is located on the circumference of the pressure-sensitive plate.

[0018] A water purifier system further includes a pressure control valve, a pretreatment assembly, a reverse osmosis membrane module, a booster pump, a flow control pump, and a heating unit. The water inlet end of the pressure control valve is communicated with the water inlet. Its water outlet end is communicated with one port of the pretreatment assembly. The other port of the pretreatment assembly is connected in parallel with a solenoid valve and a reflux check joint. The water inlet end of the reflux check joint is connected to the water return port of the flow control valve. The water outlet of the flow control valve is connected to the flow control pump. The water outlet end of the flow control pump is connected to the heating unit. The heating unit is connected to a hot water faucet. The solenoid valve is connected to the water inlet end of the booster pump. The water outlet end of the booster pump is connected to the water inlet end of the reverse osmosis membrane module. The clean water outlet of the reverse osmosis membrane module is connected to the water inlet of the flow control valve. A flushing solenoid valve is provided on its concentrated water outlet. A clean water check joint, a high-pressure switch, and a cold water faucet are sequentially provided on the water path between the reverse osmosis membrane module and the flow control valve.

[0019] In this solution, when the hot water faucet is opened, the flow control valve starts to act. The purified water passing through the reverse osmosis membrane module is transported to the water inlet of the flow control valve through the high-pressure switch, and then discharged from the water outlet through the flow control pump and the heating unit after being heated by the heating unit. At the same time, in order to avoid excessive water pressure at the water inlet of the flow control valve, the excess water flows back to the reverse osmosis membrane module through the reflux port and the reflux check joint for re-filtration. In this way, during the operation of the water purifier system, the high-pressure switch will not be continuously started and stopped, effectively ensuring the normal operation of the water purifier system.

[0020] The beneficial effects of the present invention are:

[0021] 1. When the water outlet of the flow control valve of the present invention is closed, the water volume at the water outlet increases and the water pressure increases, causing the pressure reducing component and the water cut-off component to act. The water volume flowing from the water inlet cavity to the water outlet position gradually decreases, and the water cut-off component gradually moves downward, causing the flow rate of the water return port to gradually decrease until it is blocked. As a result, the water pressure in the water inlet cavity increases and exceeds the preset value of the high-pressure switch, causing the high-pressure switch to stop and the entire water purifying and drinking machine system to stop. When the water outlet is opened, the water pressure at the water outlet decreases, the pressure reducing component moves in the reverse direction, increasing the water volume entering the water outlet, and the water cut-off component moves upward, opening the water return port. The excess water in the water inlet cavity enters the pressure maintaining cavity. The water pressure value in the water inlet cavity is greater than the pressure maintaining value of the pressure maintaining structure, causing the water in the pressure maintaining cavity to enter the water return port for circulating water return. At the same time, the water pressure in the water inlet cavity is also reduced, preventing water pressure buildup and avoiding the continuous start and stop of the high-pressure switch during the use of the water purifying and drinking machine system. Through the cooperation of the pressure reducing component, the water cut-off component, and the pressure maintaining structure, during operation, the water pressure value in the water inlet cavity does not exceed the action value of the high-pressure switch. When the water pressure at the water outlet decreases, the flow limiting effect of the pressure reducing component on it decreases, increasing the water volume and pressure at the water outlet. When the water pressure at the water outlet increases, the flow limiting effect of the pressure reducing component on it increases, reducing the water volume entering the water outlet column, thus better controlling the water pressure at the water outlet.

[0022] 2. The middle part of the second pressure sensing plate is provided with a penetrating third water return flow channel, which is connected to the first water return flow channel. The third water return flow channel can effectively prevent the end of the second pressure plate from being affected by the water pressure in the first water return flow channel, so that the returned water does not affect the pressure maintaining value of the pressure maintaining structure.

[0023] 3. In the entire water purifying and drinking machine system, when the hot water faucet is opened, the flow control valve starts to act. The purified water passing through the reverse osmosis membrane group is transported to the water inlet of the flow control valve through the high-pressure switch, and after being heated by the flow control pump and the heating unit at the water outlet, it is discharged from the hot water faucet. At the same time, to avoid excessive water pressure at the water inlet of the flow control valve, the excess water flows back from the water return port through the return check joint to the water path in front of the reverse osmosis membrane group for re-filtration. In this way, during the operation of the water purifying and drinking machine system, the continuous start and stop of the high-pressure switch are avoided, effectively ensuring the normal operation of the water purifying and drinking machine system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the present invention;

[0025] Figure 2 is a structural diagram of the water purifying and drinking machine system of the present invention.

[0026] Reference numerals: 01 - water inlet, 02 - water inlet chamber, 03 - end cover, 04 - gasket, 05 - first spring, 06 - first flow channel, 07 - seal body, 08 - bracket, 09 - first sealing ring, 10 - second sealing ring, 11 - partition plate, 12 - first air hole, 13 - first atmosphere chamber, 14 - fourth sealing ring, 15 - first pressure sensing plate, 16 - second flow channel, 17 - third flow channel, 18 - water outlet, 19 - water outlet chamber, 20 - valve cover, 21 - tenth sealing ring, 22 - third sealing ring, 23 - third pressure sensing plate, 24 - third atmosphere chamber, 25 - eleventh sealing ring, 26 - third spring, 27 - third air hole, 28 - ninth sealing ring, 29 - eighth sealing ring, 30 - valve body, 31 - control rod, 32 - sealing plug, 33 - water sealing port, 34 - water return port, 35 - second water return flow channel, 36 - first water return flow channel, 37 - seventh sealing ring, 38 - pressure maintaining chamber, 39 - flow limiting groove, 40 - fifth sealing ring, 41 - second pressure sensing plate, 42 - sixth sealing ring, 43 - third water return flow channel, 44 - second spring, 45 - second air hole, 46 - second atmosphere chamber, 47 - water inlet, 48 - pressure control valve, 49 - pretreatment assembly, 50 - solenoid valve, 51 - booster pump, 52 - return check joint, 53 - flow control valve, 54 - flow control pump, 55 - heating unit, 56 - hot water faucet, 57 - cold water faucet, 58 - high pressure switch, 59 - clean water check joint, 60 - reverse osmosis membrane module, 61 - flushing solenoid valve, 62 - concentrated water outlet, 63 - pressure plate. Detailed implementation mode

[0027] The following combines the embodiments and the attached drawings to make a further detailed description of the present invention, but the implementation modes of the present invention are not limited thereto.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the attached drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0029] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged", "provided with", "installed", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Embodiment 1

[0031] As Figure 1 shown, a flow control valve includes a valve body 30, a valve cover 20 and an end cover 03. The end cover 03 is hermetically connected to the side surface of the valve body 30 in a matching manner, and the valve cover 20 is connected to the upper end of the valve body 30 in a matching manner. A water return port 34 is provided downward on the valve body 30. An inlet port 01 and an inlet cavity 02 communicating with the inlet port 01 are provided on the side surface of the end cover 03. An outlet port 18 is provided upward on the valve cover 20. A pressure-holding cavity 38 communicating with the inlet cavity 02 is jointly formed between the end cover 03 and the valve body 30. A pressure-reducing assembly for controlling the water pressure at the outlet port 18 is provided on the water path where the inlet cavity 02 communicates with the outlet port 18. A pressure-holding structure for maintaining the water pressure in the inlet cavity 02 is provided on the water path where the inlet cavity 02 communicates with the water return port 34. The pressure-holding structure is preset with a pressure-holding value. When the flow control valve 53 operates normally, the water pressure value at the inlet cavity 02 is greater than the pressure-holding value of the pressure-holding structure, and this pressure-holding value is greater than the water pressure value at the outlet port 18. At this time, the pressure-holding cavity 38 and the water return port 34 are in a conducting state. A cut-off assembly for controlling the on-off of the water flow at the water return port 34 is provided on the water path where the outlet port 18 communicates with the water return port 34. When the flow control valve 53 stops operating, the water return port 34 is in a closed state.

[0032] In this embodiment, when the water outlet 18 of the flow control valve 53 is closed, the water volume at the water outlet 18 increases and the water pressure increases, causing the pressure reducing component and the water cut-off component to act. The water volume entering the position of the water outlet 18 from the water inlet cavity 02 gradually decreases, and the water cut-off component gradually moves downward, causing the flow rate of the water return port 34 to gradually decrease until it is blocked. As a result, the water pressure in the water inlet cavity 02 increases and exceeds the preset value of the high-pressure switch 58, the high-pressure switch 58 stops, and the entire water purifier system stops. When the water outlet 18 is opened, the pressure at the water outlet 18 decreases, the pressure reducing component moves in the reverse direction, causing the water volume entering the water outlet 18 to increase, and the water cut-off component moves upward, opening the water return port 34. The excess water in the water inlet cavity 02 enters the pressure maintaining cavity 38. The water pressure value in the water inlet cavity 02 is greater than the pressure maintaining value of the pressure maintaining structure, causing the water in the pressure maintaining cavity 38 to enter the water return port 34 for circulating water return. At the same time, the water pressure in the water inlet cavity 02 also decreases, preventing water hammer. In this way, the high-pressure switch 58 will not continuously start and stop during the use of the water purifier system. Through the cooperation of the pressure reducing component, the water cut-off component, and the pressure maintaining structure, during operation, the water pressure value in the water inlet cavity 02 will not exceed the pressure value of the high-pressure switch 58. When the water pressure at the water outlet 18 decreases, the current limiting effect of the pressure reducing component on it decreases, causing the water volume and pressure at the water outlet 18 to increase. When the pressure at the water outlet 18 increases, the current limiting effect of the pressure reducing component on it increases, reducing the water volume entering the water outlet 18 column, thereby better controlling the water pressure at the water outlet 18.

[0033] Embodiment 2

[0034] The pressure reducing component includes a first pressure sensing plate 15, a first spring 05, a sealing gasket 04, a partition plate 11, and a bracket 08. The partition plate 11 is hermetically and matingly clamped in the valve body 30. The sealing gasket 04 and the bracket 08 are sequentially pressed between the end cover 03 and the partition plate 11. A first atmosphere cavity 13 is formed between the first pressure sensing plate 15 and the partition plate 11. The valve body 30 and the partition plate 11 are provided with a first air hole 12 for conducting the first atmosphere cavity 13. The bracket 08 body is provided with a first flow channel 06 for connecting to the water inlet cavity 02. The middle position of the first pressure sensing plate 15 is provided with a second flow channel 16 for communicating with the first flow channel 06. The right end of the first pressure sensing plate 15 is in a flared shape, and the second flow channel 16 is arranged at the bottom of the flared opening. The right end of the first pressure sensing plate 15 is open. The first spring 05 is arranged in the opening to limit the spring and prevent the first pressure sensing plate 15 from slipping when moving left and right. The valve body 30 body is provided with a third flow channel 17 for conducting the second flow channel 16 and the water outlet 18. One end of the first spring 05 acts on the sealing gasket 04, and the other end acts on the inner wall of the first pressure sensing plate 15. A first sealing ring 09 is hermetically pressed between the bracket 08 and the partition plate 11 and is located circumferentially around the first pressure sensing plate 15. The first sealing ring 09 does not move with the first pressure sensing plate 15. The bracket 08 and the partition plate 11 are both provided with through cavities to facilitate the movement of the first pressure sensing plate 15. The first pressure sensing plate 15 moves left and right under the combined action of the water pressure at the water outlet 18, the first spring 05, and the pressure in the first atmosphere cavity 13 to form a pressure reducing component for controlling the water pressure value at the water outlet 18.

[0035] In this solution, when the water outlet 18 stops, the water volume at the water outlet 18 increases, the water pressure increases, and the water pressure at the water inlet 01 acts on the first pressure-sensitive plate 15 through the third flow channel 17. The third flow channel 17 is communicated with the water inlet cavity 02 through the second flow channel 16 and the first flow channel 06. Under the action of the water pressure at the water outlet 18, the first pressure-sensitive plate 15 moves to the left, overcoming the elastic force of the first spring 05 and the air pressure in the first air cavity 13, so that the water volume flowing from the first flow channel 06 into the second flow channel 16 gradually decreases. When the left end of the first pressure-sensitive plate 15 contacts the gasket 04, the water flow between the first flow channel 06 and the third flow channel 17 is limited to the greatest extent, the water volume at the water inlet 01 reaches the maximum, and the water pressure reaches the maximum. During the increase of the water pressure, the water pressure at the water outlet 18 continuously overcomes the reaction force of the water cut-off assembly, so that the water cut-off assembly blocks the water return port 34. When the water pressure value in the water inlet cavity 02 exceeds the preset value of the high-pressure switch 58, the high-pressure switch 58 stops, and the pure drinking machine system stops. When the water outlet 18 is opened, the water pressure at the water outlet 18 decreases. When the pressure value at the water outlet 18 is not sufficient to overcome the elastic force of the first spring 05 and the pressure in the first air cavity 13, the first pressure-sensitive plate 15 moves to the left, and the water volume flowing from the purified water in the water inlet cavity 02 into the second flow channel 16 through the first flow channel 06 increases, and the water pressure in the water inlet cavity 02 decreases. At the same time, the water cut-off assembly moves upward, the water return port 34 is opened, and the excess water in the water inlet cavity 02 enters the water return port 34 through the pressure maintaining structure for recycling. In this way, during the use of the pure drinking machine system, the water pressure in the water inlet cavity 02 will not exceed the preset value of the high-pressure switch 58, so that the high-pressure switch 58 will not start and stop continuously, ensuring the normal operation of the pure drinking machine system.

[0036] Embodiment 3

[0037] The pressure maintaining structure includes a second pressure-sensitive plate 41 and a second spring 44. In the valve body 30, there are a first water return flow channel 36 and a second water return flow channel 35 formed by the valve body 30 itself and communicated with the water return port 34. The second pressure-sensitive plate 41 is located in the pressure maintaining cavity 38. A second air cavity 46 is formed between the second pressure-sensitive plate 41 and the inner wall of the end cover 03. The end cover 03 is provided with a second air hole 45 communicated with the second air cavity 46. The second spring 44 is located in the second air cavity 46, with one end acting on the inner wall of the end cover 03 and the other end acting on the side wall of the second pressure-sensitive plate 41. A flow limiting groove 39 formed by the valve body 30 itself is provided in the valve body 30. The second pressure-sensitive plate 41 moves left and right under the combined action of the second spring 44, the air pressure in the second air cavity 46 and the pressure in the water inlet cavity 02 to form a pressure maintaining structure for controlling the on-off of the water flow between the pressure maintaining cavity 38 and the first water return flow channel.

[0038] In this embodiment, when the water purifier is operating, since the preset value of the pressure maintaining structure is less than the water pressure value in the water inlet chamber 02, the water pressure in the water inlet chamber 02 can overcome the elastic force of the second spring 44 and the internal pressure of the second air chamber 46, and the right end of the second pressure sensing plate 41 moves to the left beyond the position of the flow limiting groove 39, so that the pressure maintaining chamber 38 is communicated with the first water return flow channel 36. In this way, the excess water in the water inlet chamber 02 enters the first water return flow channel 36 and the second water return flow channel 35 from the pressure maintaining chamber 38, and then is recycled through the water return port 34. In this way, when the water purifier system is operating, the water pressure in the water inlet chamber 02 will never exceed the preset value of the high-pressure switch 58, so that the high-pressure switch 58 will not be continuously started and stopped, ensuring the normal operation of the water purifier system.

[0039] Embodiment 4

[0040] A through third water return flow channel 43 is provided in the middle of the second pressure sensing plate 41. The third water return flow channel 43 is connected to the first water return flow channel. The second pressure sensing plate 41 is in a cross shape. The third water return flow channel 43 penetrates the horizontal part of the second pressure sensing plate 41. The vertical part of the second pressure sensing plate 41 is fitted and clamped with the inner wall of the pressure maintaining chamber 38. Sealing rings are sleeved on the left and right ends of the horizontal part and the vertical part. The third water return flow channel 43 can effectively prevent the end of the second pressure plate 63 under the action of the water pressure in the first water return flow channel, so that the returned water will not affect the pressure maintaining value of the pressure maintaining structure.

[0041] Embodiment 5

[0042] The flow cut-off assembly includes a third pressure sensing plate 23, a pressure plate 63, a third spring 26 and a third sealing ring 22. The third pressure sensing plate 23 is in a T shape. An outlet chamber 19 communicated with the water outlet 18 is provided at the middle position of the third pressure sensing plate 23. A control rod 31 is provided at the lower end of the third pressure sensing plate 23. The third pressure sensing plate 23 and the control rod 31 are integrally formed. The outlet chamber 19 extends downward to the lower end of the control rod 31 but does not penetrate. The third sealing ring 22 is sleeved on the circumferential direction of the upper end of the third pressure sensing plate 23 and moves with the third pressure sensing plate 23. The circumferential direction of the upper end of the third pressure sensing plate 23 is closely attached to the inner wall of the valve body 30. The pressure plate 63 is hermetically sleeved on the third pressure sensing plate 23 and is clamped with the valve body 30. A through cavity for facilitating up and down movement is provided in the middle of the pressure plate 63. The pressure plate 63, the third pressure sensing plate 23 and the inner wall of the lower sleeve of the valve cover form a third air chamber 24. A third air hole 27 communicated with the external atmosphere and the third air chamber 24 is provided on the pressure plate 63. The third spring 26 is located in the third air chamber 24 and acts on the third pressure sensing plate 23 at one end and on the pressure plate 63 at the other end. A sealing plug 32 is fixed at the bottom end of the control rod 31. The third pressure sensing plate 23 moves up and down under the combined action of the pressure in the outlet chamber 19, the air pressure in the third air chamber 24 and the third spring 26 to form a flow cut-off assembly for controlling the on-off of the water flow in the water return port 34.

[0043] In this embodiment, when the water outlet 18 is closed, the water flow in the water outlet chamber 19 is blocked, resulting in water pressure buildup. The water pressure value in the water outlet chamber 19 increases. At this time, the water pressure value in the water outlet chamber 19 overcomes the elastic force of the first spring 05 and the pressure in the first atmospheric chamber 13. The water pressure acts on the first pressure plate 15 and drives it to move leftward, thereby restricting the flow rate of the water entering the water outlet chamber 19 from the first flow channel 06. At the same time, the water pressure in the water inlet chamber 02 also overcomes the elastic force of the third spring 26 and the air pressure in the third atmospheric chamber 24, causing the third pressure plate 23 to move downward until the lower end of the third pressure plate 23 closes the water return port 34. When the water outlet 18 is opened, the water volume in the water inlet chamber 02 decreases, and its water pressure value decreases. As a result, the water pressure in the water outlet chamber 19 is insufficient to overcome the elastic force of the first spring 05 and the pressure in the first atmospheric chamber 13, as well as the elastic force of the third spring 26 and the air pressure in the third atmospheric chamber 24. This causes the first pressure plate 15 to move rightward, and the water volume entering the water outlet chamber 19 from the first flow channel 06 increases to ensure that the pressure and water volume in the water outlet chamber 19 can ensure the normal operation of the water purification machine system. At the same time, the third pressure plate 23 moves upward, the water return port 34 opens, and the excess water in the water inlet chamber 02 enters the water return port 34 through the pressure maintaining structure for recycling. At the same time, the pressure value in the water inlet chamber 02 also decreases. At the same time, the upward movement of the third pressure plate 23 enables a relatively long vertical pipeline to be appropriately connected at the water outlet 18 and can also ensure the water supply.

[0044] Embodiment 6

[0045] A second sealing ring 10 is sleeved circumferentially on the partition plate 11 and is tightly sealed between the partition plate 11 and the inner wall of the valve body 30. A fourth sealing ring 14 is tightly sealed between the right end of the partition plate 11 and the inner wall of the valve body 30.

[0046] The second pressure plate 41 is cross-shaped. A fifth sealing ring 40 is provided between the second pressure plate 41 and the inner wall of the end cover 03 that forms the second atmospheric chamber 46. The fifth sealing ring 40 is sleeved on the circumference of the vertical part of the second pressure plate 41. Sixth and seventh sealing rings 42 and 37 are respectively sleeved on both sides of the horizontal part of the second pressure plate 41. The sixth sealing ring 42 is circumferentially pressed between the second pressure plate 41 and the inner wall of the end cover 03, and the seventh sealing ring 37 is circumferentially pressed between the second pressure plate 41 and the inner wall of the first water return flow channel.

[0047] An eighth sealing ring 29 is provided between the pressure plate 63 and the body 30 of the valve body 30 that forms the second water return flow channel 35. The eighth sealing ring 29 is located on the lower side surface of the third pressure plate 23. A ninth sealing ring 28 is provided between the pressure plate 63 and the valve body 30. The ninth sealing ring 28 is located circumferentially on the pressure plate 63.

[0048] Embodiment 7

[0049] As Figure 2As shown in the figure, a water purifier system further includes a pressure control valve 48, a pretreatment component 49, a reverse osmosis membrane module 60, a booster pump 51, a flow control pump 54, and a heating unit 55. The water inlet end of the pressure control valve 48 is connected to the incoming water inlet 47, and its water outlet end is connected to one port of the pretreatment component 49. The other port of the pretreatment component 49 is connected in parallel with a solenoid valve 50 and a return check joint 52. The water inlet end of the return check joint 52 is connected to the water return port 34 of the flow control valve 53. The water outlet 18 of the flow control valve 53 is connected to the flow control pump 54. The water outlet end of the flow control pump 54 is connected to the heating unit 55. The heating unit 55 is connected to a hot water faucet 56. The solenoid valve 50 is connected to the water inlet end of the booster pump 51. The water outlet end of the booster pump 51 is connected to the water inlet end of the reverse osmosis membrane module 60. The clean water outlet of the reverse osmosis membrane module 60 is connected to the water inlet 01 of the flow control valve 53. A flushing solenoid valve 61 is provided on its concentrated water outlet 62. A clean water check joint 59, a high-pressure switch 58, and a cold water faucet 57 are successively provided on the water path between the reverse osmosis membrane module 60 and the flow control valve 53.

[0050] In this solution, when the hot water faucet 56 is opened, the flow control valve 53 starts to act. The purified water passing through the reverse osmosis membrane module 60 is delivered to the water inlet 01 of the flow control valve 53 through the high-pressure switch 58, and after being heated by the flow control pump 54 and the heating unit 55, it is discharged from the hot water faucet 56. At the same time, in order to avoid excessive water pressure at the water inlet 01 of the flow control valve 53, the excess water flows back to the water path in front of the reverse osmosis membrane module 60 through the return port and the return check joint 52 for re-filtration. In this way, during the operation of the water purifier system, the high-pressure switch 58 will not be continuously started and stopped, effectively ensuring the normal operation of the water purifier system.

[0051] Principle of use of the present invention: After the flow control valve 53 is connected to the water purifier system, when the hot water faucet 56 in the system is opened, the water outlet 18 of the flow control valve 53 is opened, and the pressure at the water outlet 18 decreases. When the pressure value at the water outlet 18 is not sufficient to overcome the elastic force of the first spring 05 and the pressure in the first air chamber 13, the first pressure sensing plate 15 moves to the right, and the amount of purified water in the water inlet chamber 02 entering the second flow channel 16 through the first flow channel 06 increases, and the water pressure in the water inlet chamber 02 decreases, so that the amount of water entering the water outlet 18 increases. Moreover, the third pressure sensing plate 23 moves upward under the action of the third spring 26 and the internal pressure of the third air chamber 24, and the water return port 34 is opened, and the excess water in the water inlet chamber 02 enters the pressure maintaining chamber 38. The water pressure value in the water inlet chamber 02 is greater than the pressure maintaining value of the pressure maintaining structure, so that the water in the pressure maintaining chamber 38 enters the water return port 34 for circulating water return. At the same time, the water pressure in the water inlet chamber 02 is also reduced, and no pressure buildup will occur, so that the high-pressure switch 58 will not continuously start and stop during the use of the water purifier system. Through the cooperation of the pressure reducing component, the water cut-off component and the pressure maintaining structure, during operation, the water pressure value in the water inlet chamber 02 will not exceed the pressure value of the high-pressure switch 58. When the water pressure at the water outlet 18 decreases, the current limiting effect of the pressure reducing component on it decreases, so that the amount of water at the water outlet 18 increases and the pressure increases. When the pressure at the water outlet 18 increases, the current limiting effect of the pressure reducing component on it increases, and the amount of water entering the water outlet 18 column decreases, so that the water pressure at the water outlet 18 can be better controlled; when the hot water faucet 56 is closed, the water outlet 18 of the flow control valve 53 is closed, the amount of water at the water outlet 18 increases, and the water pressure increases, so that the first pressure sensing plate 15 moves to the left, and the amount of water entering the water outlet chamber 19 from the water inlet chamber 02 gradually decreases. As the water pressure in the water outlet chamber 19 increases, the third pressure sensing plate 23 gradually moves downward, so that the flow rate of the water return port 34 gradually decreases until it is blocked, so that the water pressure in the water inlet chamber 02 increases and exceeds the preset value of the high-pressure switch 58, and the high-pressure switch 58 stops, and the entire water purifier system stops.

[0052] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Based on the technical essence of the present invention, any simple modifications, equivalent replacements and improvements made to the above embodiments within the spirit and principles of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A flow control valve, comprising a valve body (30), a valve cover (20) and an end cover (03). A water return port (34) is provided on the valve body (30). An inlet port (01) and an inlet cavity (02) communicating with the inlet port (01) are provided on the end cover (03). An outlet port (18) is provided on the valve cover (20). A pressure maintaining cavity (38) communicating with the inlet cavity (02) is formed between the end cover (03) and the valve body (30). Characterized in that, A pressure reducing assembly for controlling the water pressure at the outlet port (18) is provided on the water path where the inlet cavity (02) communicates with the outlet port (18). A pressure maintaining structure for maintaining the water pressure in the inlet cavity (02) is provided on the water path where the inlet cavity (02) communicates with the water return port (34). The pressure maintaining structure is preset with a pressure maintaining value. When the flow control valve (53) operates normally, the water pressure value at the inlet cavity (02) is greater than the pressure maintaining value of the pressure maintaining structure. At this time, the pressure maintaining cavity (38) and the water return port (34) are in a conducting state. A flow cut-off assembly for controlling the on-off of the water flow at the water return port (34) is provided in the cavity where the outlet port (18) and the water return port (34) communicate. When the flow control valve (53) stops, the water return port (34) is in a closed state; The pressure maintaining structure includes a second pressure sensing plate (41) and a second spring (44). A first water return flow channel (36) and a second water return flow channel (35) formed by the valve body (30) itself and communicating with the water return port (34) are provided in the valve body (30). The second pressure sensing plate (41) is located in the pressure maintaining cavity (38). A second atmosphere cavity (46) is formed between the second pressure sensing plate (41) and the inner wall of the end cover (03). A second air hole (45) communicating with the second atmosphere cavity (46) is provided on the end cover (03). The second spring (44) is located in the second atmosphere cavity (46) and one end acts on the inner wall of the end cover (03), and the other end acts on the wall of the second pressure sensing plate (41). A current limiting groove (39) formed by the valve body (30) itself is provided in the valve body (30). The second pressure sensing plate (41) moves left and right under the combined action of the second spring (44), the air pressure in the second atmosphere cavity (46) and the water pressure in the inlet cavity (02) to form a pressure maintaining structure for controlling the on-off of the water flow between the pressure maintaining cavity (38) and the first water return flow channel (36); The pressure reducing component includes a first pressure sensing plate (15), a first spring (05), a sealing gasket (04), a partition plate (11), and a bracket (08). The partition plate (11) is hermetically and fixedly matched inside the valve body (30). The sealing gasket (04) and the bracket (08) are successively fastened between the end cover (03) and the partition plate (11). A first atmosphere chamber (13) is formed between the first pressure sensing plate (15) and the partition plate (11). The valve body (30) and the partition plate (11) are provided with a first air hole (12) for conducting the first atmosphere chamber (13). The bracket (08) body is provided with a first flow channel (06) for connecting to the water inlet chamber (02). The middle position of the first pressure sensing plate (15) is provided with a second flow channel (16) for connecting to the first flow channel (06). The valve body (30) body is provided with a third flow channel (17) for conducting the second flow channel (16) and the water outlet (18). One end of the first spring (05) acts on the sealing gasket (04), and the other end acts on the inner wall of the first pressure sensing plate (15). A first sealing ring (09) is hermetically pressed between the bracket (08) and the partition plate (11) and is located circumferentially around the first pressure sensing plate (15). The first sealing ring (09) does not move with the first pressure sensing plate (15). The first pressure sensing plate (15) moves left and right under the combined action of the water pressure at the water outlet (18), the first spring (05), and the pressure in the first atmosphere chamber (13) to form a pressure reducing component for controlling the water pressure value at the water outlet (18).

2. The flow control valve according to claim 1, wherein, a through third return water flow channel (43) is provided in the middle of the second pressure sensing plate (41), and the third return water flow channel (43) is connected to the first return water flow channel (36).

3. The flow control valve according to claim 1, wherein, The flow cut-off component includes a third pressure sensing plate (23), a pressure plate (63), a third spring (26), and a third sealing ring (22). An outlet water chamber (19) connected to the water outlet (18) is provided on the third pressure sensing plate (23). A control rod (31) is provided at the lower end of the third pressure sensing plate (23). The third sealing ring (22) is sleeved on the circumferential direction of the upper end of the third pressure sensing plate (23) and moves with the third pressure sensing plate (23). The circumferential direction of the upper end of the third pressure sensing plate (23) is closely attached to the inner wall of the valve body (30). The pressure plate (63) is sleeved on the third pressure sensing plate (23) and is fastened to the valve body (30). The pressure plate (63), the third pressure sensing plate (23), and the inner wall of the lower sleeve of the valve cover (20) form a third atmosphere chamber (24). The pressure plate (63) is provided with a third air hole (27) for connecting to the external atmosphere and the third atmosphere chamber (24). The third spring (26) is located in the third atmosphere chamber (24), with one end acting on the third pressure sensing plate (23) and the other end acting on the pressure plate (63). A sealing plug (32) is fixed to the bottom end of the control rod (31). The third pressure sensing plate (23) moves up and down under the combined action of the water pressure in the outlet water chamber (19), the air pressure in the third atmosphere chamber (24), and the third spring (26) to form a flow cut-off component for controlling the on-off of the water flow at the water return port (34).

4. The flow control valve according to claim 1, wherein, A second sealing ring (10) is sleeved circumferentially on the partition plate (11). The second sealing ring (10) is hermetically pressed between the partition plate (11) and the inner wall of the valve body (30). A fourth sealing ring (14) is hermetically pressed between the right end of the partition plate (11) and the inner wall of the valve body (30).

5. A flow control valve according to claim 1, wherein, the second pressure sensing plate (41) is cross-shaped. A fifth sealing ring (40) is provided between the second pressure sensing plate (41) and the inner wall of the end cover (03) forming the second air chamber (46). The fifth sealing ring (40) is sleeved circumferentially on the body part of the second pressure sensing plate (41). Sixth and seventh sealing rings (42) and (37) are respectively sleeved at both ends of the flow channel part of the second pressure sensing plate (41). The sixth sealing ring (42) is circumferentially pressed between the second pressure sensing plate (41) and the inner wall of the sealing sleeve provided on the end cover (03). The seventh sealing ring (37) is circumferentially pressed between the second pressure sensing plate (41) and the inner wall of the first return water flow channel (36).

6. A flow control valve according to claim 3, wherein, an eighth sealing ring (29) is provided between the pressing plate (63) and the body of the valve body (30) forming the second return water flow channel (35). The eighth sealing ring (29) is located on the lower side surface of the third pressure sensing plate (23). A ninth sealing ring (28) is provided between the pressing plate (63) and the valve body (30). The ninth sealing ring (28) is located circumferentially on the pressing plate (63).

7. A water purifying and drinking machine system composed of a flow control valve according to any one of claims 1-6, wherein, it includes a pressure control valve (48), a pretreatment assembly (49), a reverse osmosis membrane module (60), a booster pump (51), a flow control pump (54) and a heating unit (55). The water inlet end of the pressure control valve (48) is communicated with the water inlet (47). Its water outlet end is communicated with one port of the pretreatment assembly (49). The other port of the pretreatment assembly (49) is connected in parallel with a solenoid valve (50) and a reflux check joint (52). The water inlet end of the reflux check joint (52) is connected to the water return port (34) of the flow control valve (53). The water outlet (18) of the flow control valve (53) is connected to the flow control pump (54). The water outlet end of the flow control pump (54) is connected to the heating unit (55). The heating unit (55) is connected to a hot water faucet (56). The solenoid valve (50) is connected to the water inlet end of the booster pump (51). The water outlet end of the booster pump (51) is connected to the water inlet end of the reverse osmosis membrane module (60). The purified water outlet of the reverse osmosis membrane module (60) is connected to the water inlet (01) of the flow control valve (53). A flushing solenoid valve (61) is provided on its concentrated water outlet (62). A purified water check joint (59), a high-pressure switch (58) and a cold water faucet (57) are successively provided on the water path between the reverse osmosis membrane module (60) and the flow control valve (53).

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