CN210612977U - Pool purifying device - Google Patents

Abstract

The utility model provides a pair of pool purification device, include: the water tank is provided with a first water inlet and a first water outlet; the sand cylinder is provided with a first circulation port and a second circulation port, filter sand is arranged in the sand cylinder, the working condition that water flows from the first circulation port to the second circulation port through the filter sand in the sand cylinder is a filtering working condition, and the working condition that water flows from the second circulation port to the first circulation port is a backwashing working condition; the water return pool is at least provided with a second water outlet; a first pipeline; a second pipeline; a third pipeline; the fourth pipeline, what this pond purifier carried out the back flush to the filter sand in the sand jar and utilized is the water in the return water pond, can not waste the water in the pond, does not need often to supply the water yield, and holistic purification efficiency is higher, and when the pond was taken as swimming pool or ocean hall exhibition pond, this pond purifier's purification efficiency was higher and can be in resource saving to a certain extent, improvement resource utilization.

Description

Pool purifying device

Technical Field

The utility model relates to a pond purifies technical field, concretely relates to pond purifier.

Background

The swimming pool must use a filtering device to filter the dirt in the using process of the swimming pool, and the prior art basically adopts a sand cylinder as the filtering device.

The prior art discloses an automatic control device of a sand cylinder, which comprises a central controller, four electromagnetic valves and a control unit, wherein the four electromagnetic valves are connected with the central controller through electromagnetic signal lines and respectively comprise a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve; the first electromagnetic valve end is connected with a water outlet arranged at the bottom of the swimming pool, the other end is connected with a fourth electromagnetic valve, and the first electromagnetic valve is arranged at the top of the sand filtering layer; the end of the second electromagnetic valve is communicated with a water outlet arranged at the bottom of the swimming pool, the other end of the second electromagnetic valve and the third electromagnetic valve are provided with a connecting pipeline through which liquid can flow without passing through a sand filtering layer, and the second electromagnetic valve is arranged at the bottom of the sand filtering layer; one end of the fourth electromagnetic valve is connected with the water outlet, a sand filtering layer is arranged between the third electromagnetic valve and the first electromagnetic valve, and the third electromagnetic valve is arranged at the bottom of the sand filtering layer; the fourth solenoid valve end links to each other with the outlet of swimming pool, and the fourth solenoid valve setting is provided with liquid flow between first solenoid valve and the fourth solenoid valve and need not through the continuous pipeline of filtering sand layer at the top of filtering sand layer, and the second solenoid valve links to each other with the fourth solenoid valve, is provided with the filtering sand layer between. When needing to filter, control box control second solenoid valve and fourth solenoid valve are closed, and control first solenoid valve and third solenoid valve open, and swimming pool water is held back the filth through the sand bed to the sand jar through first solenoid valve after the water pump pressurization, and rethread third solenoid valve filters clean swimming pool water and flows back to the swimming pool through the pipeline. During back flushing, the control box controls the first electromagnetic valve and the third electromagnetic valve to be closed, the second electromagnetic valve and the fourth electromagnetic valve to be opened, swimming pool water is pressurized by the water pump and then flows to the sand cylinder through the second electromagnetic valve, sand of the sand cylinder is reversely washed, and sewage is discharged through the pipeline through the fourth electromagnetic valve.

The process of above-mentioned prior art filtration and back flush all is in making the water entering sand jar in the swimming pool, can lead to filterable clean water to get into the sand jar once more like this, finally discharges as sewage, leads to the fact filterable efficiency to reduce on the whole, and water in the swimming pool still need follow the requirement that the external water yield in the swimming pool just can be satisfied, and water in the swimming pool also has certain requirement to the temperature, still need make the water in the swimming pool reach the temperature value of requirement behind the make-up water. When above-mentioned sand jar automatic control device is used to the showplace of ocean exhibition pond and is given up a life to the system, because the back flush leads to the water yield in the showplace of ocean to reduce, can lead to filtration efficiency to reduce to the water in the showplace of ocean has special requirement, if often need supply the water yield, can cause the waste of resource simultaneously.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the sand jar automatic control device filtration efficiency among the prior art and lower and the extravagant defect of resource to a filtration efficiency height just can improve resource utilization's pond purifier is provided.

In order to solve the technical problem, the utility model provides a pair of pool purification device, include:

the water tank is provided with a first water inlet and a first water outlet;

the sand cylinder is provided with a first circulation port and a second circulation port, filter sand is arranged in the sand cylinder, the working condition that water flows from the first circulation port to the second circulation port through the filter sand in the sand cylinder is a filtering working condition, and the working condition that water flows from the second circulation port to the first circulation port is a backwashing working condition;

the water return pool is at least provided with a second water outlet;

the first pipeline is connected with the first water inlet and the second circulation port, and a first switch valve for controlling the on-off of the first pipeline is arranged on the first pipeline;

the second pipeline is connected with the first water outlet and the first circulation port, and is provided with a first water suction pump and a second switch valve for controlling the on-off of the second pipeline;

the third pipeline is connected with the second water outlet and the second circulation port, and a second water suction pump and a third switch valve for controlling the on-off of the third pipeline are arranged on the third pipeline;

the fourth pipeline is connected with the first circulation port and the sewage discharge port, and a fourth switching valve for controlling the fourth pipeline to be switched on and off is arranged on the fourth pipeline;

when the working condition is filtered, the first switch valve, the second switch valve and the first water pump are opened, and the third switch valve, the fourth switch valve and the second water pump are closed;

and when the backwashing is in a working condition, the third switch valve, the fourth switch valve and the second water suction pump are opened, and the first switch valve, the second switch valve and the first water suction pump are closed.

The water pump further comprises a controller, and the controller is electrically connected with the first switch valve, the second switch valve, the third switch valve, the fourth switch valve, the first water pump and the second water pump respectively.

A pressure sensor for detecting the difference between inlet pressure and outlet pressure is arranged between the first circulation port and the second circulation port, the pressure sensor is electrically connected with the controller, the controller is provided with a first preset pressure difference value and a second preset pressure difference value, the first preset pressure difference value is larger than the second preset pressure difference value, and the controller is used for controlling the first switch valve, the second switch valve and the first water pump to be closed and controlling the third switch valve, the fourth switch valve and the second water pump to be opened when the pressure difference value detected by the sensor is larger than the first preset pressure difference value in the filtering working condition; and the controller is used for controlling the third switch valve, the fourth switch valve and the second water suction pump to be closed when the pressure difference value detected by the sensor is smaller than the second preset pressure difference value under the back flushing working condition.

The first pipeline and the third pipeline are combined into a first flow path near the second circulation port and communicated with the second circulation port through the first flow path.

The second pipeline and the fourth pipeline are combined into a second flow path near the first circulation port and communicated with the first circulation port through the second flow path.

The pressure sensor is connected between the first flow path and the second flow path.

Be equipped with first level sensor in the pond, first level sensor with the controller electricity is connected, the controller is equipped with first predetermined liquid level, the controller is used for when filtering the operating mode, first level sensor detects the liquid level in the pond and is less than when first predetermined liquid level, control first ooff valve, second ooff valve, first suction pump are closed.

Be equipped with the second liquid level sensor in the return water pond, the second liquid level sensor with the controller electricity is connected, the controller is equipped with the second and predetermines the liquid level, the controller is used for when the back flush operating mode, the second liquid level sensor detects liquid level in the return water pond is less than when the liquid level was predetermine to the second, control third ooff valve, fourth ooff valve, second suction pump are closed.

The automatic backwashing water purifier is characterized by further comprising an alarm device, wherein the alarm device is electrically connected with the controller, the controller is used for detecting that the liquid level in the water tank is lower than the first preset liquid level when the working condition is filtered, and/or detecting that the liquid level in the water return tank is lower than the second preset liquid level when the working condition is backwashing, and the second liquid level sensor sends information to the alarm device to enable the alarm device to give an alarm.

The sewage discharge port is communicated with the water inlet end of the filtering device, and the water outlet end of the filtering device is communicated with the water return pool.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a pool purifying device, when filtering the water in the pool, open first ooff valve, second ooff valve, first suction pump, close third ooff valve, fourth ooff valve, second suction pump, first suction pump makes the water in the pool get into the sand jar through second pipeline, first circulation mouth, flow back in the pool through second circulation mouth, first pipeline, first water inlet after the sand jar filters; after the filter sand in the sand cylinder is used for a period of time, the accumulated dirt blocks the flow of water flow, the filter sand needs to be cleaned, at the moment, a third switch valve, a fourth switch valve and a second water suction pump are opened, the first switch valve, the second switch valve and the first water suction pump are closed, the second water suction pump enables water in the water return tank to enter the sand cylinder through a third pipeline and a second flow port, the filter sand in the sand cylinder is backwashed, the backwashed sewage is discharged from a sewage discharge port through a first flow port and a fourth pipeline, and the water in the water return tank is used for backwashing the filter sand in the sand cylinder, so that compared with the prior art which utilizes the water in the water tank for backwashing, the water tank purification device does not waste the water in the water tank, does not need to supplement water frequently, has high overall purification efficiency, and when the water tank is used as a swimming pool or ocean exhibition pool, the water tank purification device has high purification efficiency and can save resources to a certain extent, and the resource utilization rate is improved.

2. The utility model provides a pair of pool purification device still includes the controller, the controller respectively with first ooff valve, second ooff valve, third ooff valve, fourth ooff valve, first suction pump, second suction pump electricity are connected, through opening or closing of first ooff valve of controller control, second ooff valve, third ooff valve, fourth ooff valve, first suction pump, second suction pump, can realize this pool purification device's automatic filtration operating mode and back flush operating mode.

3. The utility model provides a pool purification device, be equipped with the pressure sensor who is used for detecting business turn over water pressure difference between first circulation mouth with the second circulation mouth, pressure sensor with the controller electricity is connected, the controller is equipped with first preset pressure difference, second preset pressure difference, first preset pressure difference is greater than second preset pressure difference, the controller is used for when filtering the operating mode, when the pressure difference that the sensor detected is greater than first preset pressure difference, control first ooff valve, second ooff valve, first suction pump and close, and control third ooff valve, fourth ooff valve, second suction pump open; the controller is used for controlling the third switch valve, the fourth switch valve and the second water suction pump to be closed when the pressure difference value detected by the sensor is smaller than the second preset pressure difference value under the back washing working condition, and the switching between the filtering working condition and the back washing working condition can be further controlled by the controller.

4. The utility model provides a pair of pond purifier, first pipeline with the third pipeline is being close to second circulation mouth department amalgamates to first flow path, and passes through first flow path with second circulation mouth intercommunication, this kind of mode of setting only need be connected first flow path and second circulation mouth can realize being connected of first pipeline, third pipeline and second circulation mouth simultaneously, and is structural simpler, and convenience of customers connects the installation.

5. The utility model provides a pair of pool purification device, the second pipeline with the fourth pipeline is being close to first circulation mouth department converges to be the second flow path, and passes through the second flow path with first circulation mouth intercommunication, this kind of mode of setting only need be connected second flow path and first circulation mouth can realize being connected of second pipeline, fourth pipeline and first circulation mouth simultaneously, and is structural simpler, and convenience of customers connects the installation.

6. The utility model provides a pair of pond purifier, pressure sensor connects first flow path with between the second flow path, the convenient installation to pressure sensor.

7. The utility model provides a pair of pond purifier, be equipped with first level sensor in the pond, first level sensor with the controller electricity is connected, the controller is equipped with the first liquid level of predetermineeing, the controller is used for when filtering the operating mode, first level sensor detects the liquid level in the pond and is less than when the first liquid level of predetermineeing, control first ooff valve, second ooff valve, first suction pump are closed, can avoid the pond water level to hang down excessively, use safelyr, further realized automated control simultaneously.

8. The utility model provides a pair of pond purifier, be equipped with second level sensor in the return water pond, second level sensor with the controller electricity is connected, the controller is equipped with the second and predetermines the liquid level, the controller is used for when the back flush operating mode, second level sensor detects liquid level in the return water pond is less than when the liquid level was predetermine to the second, control third ooff valve, fourth ooff valve, second suction pump are closed, can avoid the water level in the return water pond low excessively, use safelyr, have further realized automated control simultaneously.

9. The utility model provides a pair of pond purifier still includes alarm device, alarm device with the controller electricity is connected, the controller is used for when filtering the operating mode, first level sensor detects the liquid level in the pond and is less than first predetermineeing the liquid level, and/or during the back flush operating mode, second level sensor detects liquid level in the return water pond is less than the liquid level is predetermine to the second, to alarm device sends information, makes alarm device send out the police dispatch newspaper, can indicate user's pond or return water pond water level low excessively, the moisturizing in time of needing.

10. The utility model provides a pair of pond purifier, sewage discharge port and filter equipment's the end intercommunication of intaking, filter equipment's play water end with return water pond intercommunication, sewage discharge port exhaust sewage is utilized by the return water pond after filtering, has improved resource utilization, also avoids causing the pollution to the environment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a pool cleaning device provided in an embodiment of the present invention;

description of reference numerals:

1-a water pool; 2-a sand cylinder; 3-a water return pool; 4-a first pipeline; 5-a second pipeline; 6-a third pipeline; 7-a fourth pipeline; 8-a sewage discharge port; 9-a controller; 10-a pressure sensor; 11-a first water inlet; 12-a first water outlet; 13-a first level sensor; 21-a first circulation port; 22-a second flow port; 31-a second water outlet; 32-a second liquid level sensor; 41-a first on-off valve; 51-a second on-off valve; 52-a first suction pump; 61-a third on-off valve; 62-a second water pump; 71-fourth switching valve.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

The embodiment provides a purifier in pond 1, including pond 1, sand jar 2, return water pond 3.

Wherein the water tank 1 can be a swimming pool or a exhibition pool of a marine museum, etc., a first water inlet 11 and a first water outlet 12 are arranged on the water tank 1, and the first water inlet 11 is arranged on the upper side of the first water outlet 12.

Be equipped with first circulation opening 21 and second circulation opening 22 on the sand jar 2, be equipped with the filter sand in the sand jar 2, water is in by first circulation opening 21 warp filter sand to the operating mode that the direction of second circulation opening flows is for filtering the operating mode, by second circulation opening 22 to the operating mode that the direction of first circulation opening 21 flows is the back flush operating mode.

A second water outlet 31 is arranged on the water return pool 3.

A first pipeline 4 is connected between the first water inlet 11 of the water pool 1 and the second circulation port 22 of the sand cylinder 2, and a first switch valve 41 for controlling the on-off of the first pipeline 4 is arranged on the first pipeline 4. A second pipeline 5 is connected between the first water outlet 12 of the water pool 1 and the first circulation port 21 of the sand cylinder 2, and a first water suction pump 52 and a second switch valve 51 for controlling the on-off of the second pipeline 5 are arranged on the second pipeline 5.

A third pipeline 6 is connected between the second water outlet 31 of the water return pool 3 and the second circulation port 22 of the sand cylinder 2, and a second water suction pump 62 and a third switch valve 61 for controlling the third pipeline 6 to be turned on and off are arranged on the third pipeline 6. A fourth pipeline 7 is connected between the first circulation opening 21 of the sand cylinder 2 and the sewage discharge port 8, and a fourth switch valve 71 for controlling the fourth pipeline 7 to be opened and closed is arranged on the fourth pipeline 7.

When the working condition is filtered, the first switch valve 41, the second switch valve 51 and the first water pump 52 are opened, and the third switch valve 61, the fourth switch valve 71 and the second water pump 62 are closed; and under the back flushing working condition, the third switch valve 61, the fourth switch valve 71 and the second water pump 62 are opened, and the first switch valve 41, the second switch valve 51 and the first water pump 52 are closed.

In this embodiment, a controller 9 and an alarm device electrically connected to the controller 9 are further provided, and the controller 9 is electrically connected to the first switch valve 41, the second switch valve 51, the third switch valve 61, the fourth switch valve 71, the first water pump 52, and the second water pump 62, respectively.

As shown in fig. 1, the first pipeline 4 and the third pipeline 6 join together to form a first flow path near the second circulation port 22 and communicate with the second circulation port 22 through the first flow path, the second pipeline 5 and the fourth pipeline 7 join together to form a second flow path near the first circulation port 21 and communicate with the first circulation port 21 through the second flow path, a pressure sensor 10 for detecting a difference between inlet and outlet water pressures is disposed between the first flow path and the second flow path, the pressure sensor 10 is electrically connected to the controller 9, the controller 9 is provided with a first preset pressure difference value and a second preset pressure difference value, the first preset pressure difference value is greater than the second preset pressure difference value, and the controller 9 controls the first on-off valve 41 when a pressure difference value detected by the sensor is greater than the first preset pressure difference value in a filtering condition, The second switch valve 51 and the first water pump 52 are closed, the controller 9 is provided with preset delay time, and after the preset delay time, the third switch valve 61, the fourth switch valve 71 and the second water pump 62 are controlled to be opened; and under the back washing working condition, when the pressure difference detected by the sensor is smaller than the second preset pressure difference, the controller 9 controls the third switch valve 61, the fourth switch valve 71 and the second water pump 62 to be closed. The back washing working condition is switched to the filtering working condition at intervals of preset delay time and then is switched.

Be equipped with first level sensor 13 in the pond 1, first level sensor 13 with controller 9 electricity is connected, controller 9 is equipped with the first liquid level of predetermineeing, and during the filtration operating mode, first level sensor 13 detects the liquid level in the pond 1 and is less than during the first liquid level of predetermineeing, controller 9 control first ooff valve 41, second ooff valve 51, first suction pump 52 close to controller 9 to alarm device sends information this moment, makes alarm device send out the police dispatch newspaper, reminds the user in time to supply water for pond 1.

Be equipped with second liquid level sensor 32 in return water pond 3, second liquid level sensor 32 with the controller 9 electricity is connected, controller 9 is equipped with the second and predetermines the liquid level, during the back flush operating mode, second liquid level sensor 32 detects liquid level in the return water pond 3 is less than when the liquid level was predetermine to the second, controller 9 control third ooff valve 61, fourth ooff valve 71, second suction pump 62 close, and controller 9 to alarm device sends information this moment, makes alarm device send out the police dispatch newspaper, reminds the user in time to supply water for return water pond 3.

For the sewage that avoids 8 emission of sewage discharge port to cause the pollution to the environment, with 8 and filter equipment's the end intercommunication of intaking of sewage discharge port, filter equipment's play water end with return water pond 3 intercommunication, 8 exhaust sewage of sewage discharge port are utilized by return water pond 3 after filtering, have improved resource utilization.

Because during the back flush operating mode of this embodiment, what utilize is the water in the return water pond 3, compare prior art and utilize the water in the pond 1 to carry out the back flush, the water in 1 in this pond of 1 purifier can not extravagant pond, does not need often to supply the water yield, and holistic purification efficiency is higher, and when pond 1 was as swimming pool or ocean hall exhibition pond, this 1 purifier in pond's purification efficiency was higher and can be in the resource of saving to a certain extent, improvement resource utilization.

As a first alternative embodiment of the above embodiment, the first and third pipe lines 4 and 6 are respectively communicated with the second communication port 22, the second and fourth pipe lines 5 and 7 are respectively communicated with the first communication port 21, and the pressure sensor 10 is connected between the first and second communication ports 21 and 22, but this embodiment is not structurally simple.

As a second alternative to the above embodiment, the controller 9 may be omitted, and the filtering operation and the backwashing operation may be performed manually, which is inefficient, time consuming and energy consuming.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.

Claims (10)

1. A pool cleaning apparatus, comprising:

the water tank (1) is provided with a first water inlet (11) and a first water outlet (12);

the sand cylinder is provided with a first circulation port (21) and a second circulation port (22), filter sand is arranged in the sand cylinder, the working condition that water flows from the first circulation port (21) to the second circulation port through the filter sand in the sand cylinder is a filtering working condition, and the working condition that water flows from the second circulation port (22) to the first circulation port (21) is a backwashing working condition;

the water return pool (3) is at least provided with a second water outlet (31);

the first pipeline (4) is connected with the first water inlet (11) and the second circulation port (22), and a first switch valve (41) for controlling the on-off of the first pipeline (4) is arranged on the first pipeline (4);

the second pipeline (5) is connected with the first water outlet (12) and the first circulation port (21), and a first water suction pump (52) and a second switch valve (51) for controlling the second pipeline (5) to be switched on and off are arranged on the second pipeline (5);

the third pipeline (6) is connected with the second water outlet (31) and the second circulation port (22), and a second water suction pump (62) and a third switch valve (61) for controlling the third pipeline (6) to be switched on and off are arranged on the third pipeline (6);

the fourth pipeline (7) is connected with the first circulation port (21) and the sewage discharge port (8), and a fourth switching valve (71) for controlling the fourth pipeline (7) to be switched on and off is arranged on the fourth pipeline (7);

when the working condition is filtered, the first switch valve (41), the second switch valve (51) and the first water pump (52) are opened, and the third switch valve (61), the fourth switch valve (71) and the second water pump (62) are closed;

and when the backwashing is in a working condition, the third switch valve (61), the fourth switch valve (71) and the second water pump (62) are opened, and the first switch valve (41), the second switch valve (51) and the first water pump (52) are closed.

2. The pool cleaning device according to claim 1, further comprising a controller (9), wherein the controller (9) is electrically connected to the first switch valve (41), the second switch valve (51), the third switch valve (61), the fourth switch valve (71), the first water pump (52) and the second water pump (62), respectively.

3. A pool cleaning device according to claim 2, in which a pressure sensor (10) is provided between the first (21) and second (22) ports for sensing the difference in inlet and outlet water pressures, the pressure sensor (10) is electrically connected with the controller (9), the controller (9) is provided with a first preset pressure difference value and a second preset pressure difference value, the first preset pressure difference is larger than the second preset pressure difference, the controller (9) is used for controlling the pressure difference of the air in the air filter to be in a filtering working condition, when the pressure difference value detected by the pressure sensor (10) is larger than the first preset pressure difference value, the first switch valve (41), the second switch valve (51) and the first water pump (52) are controlled to be closed, the third switch valve (61), the fourth switch valve (71) and the second water pump (62) are controlled to be opened; the controller (9) is used for controlling the third switch valve (61), the fourth switch valve (71) and the second water suction pump (62) to be closed when the pressure difference detected by the pressure sensor (10) is smaller than the second preset pressure difference under the back flushing working condition.

4. A pool cleaning device according to claim 3, in which the first (4) and third (6) lines merge into a first flow path adjacent the second port (22) and communicate with the second port (22) via the first flow path.

5. A pool cleaning device according to claim 4, in which the second conduit (5) and the fourth conduit (7) merge into a second flow path adjacent the first port (21) and communicate with the first port (21) via the second flow path.

6. A pool cleaning device according to claim 5, in which the pressure sensor (10) is connected between the first and second flow paths.

7. The pool purification device according to claim 2, wherein a first liquid level sensor (13) is arranged in the pool (1), the first liquid level sensor (13) is electrically connected with the controller (9), the controller (9) is provided with a first preset liquid level, and the controller (9) is used for controlling the first switch valve (41), the second switch valve (51) and the first water pump (52) to be closed when the first liquid level sensor (13) detects that the liquid level in the pool (1) is lower than the first preset liquid level under the filtering working condition.

8. The pool purification device according to claim 7, wherein a second liquid level sensor (32) is arranged in the water return pool (3), the second liquid level sensor (32) is electrically connected with the controller (9), the controller (9) is provided with a second preset liquid level, and the controller (9) is configured to control the third switch valve (61), the fourth switch valve (71) and the second water pump (62) to be turned off when the second liquid level sensor (32) detects that the liquid level in the water return pool (3) is lower than the second preset liquid level under the back washing condition.

9. The pool purification device according to claim 8, further comprising an alarm device electrically connected to the controller (9), wherein the controller (9) is configured to detect that the liquid level in the pool (1) is lower than the first preset liquid level by the first liquid level sensor (13) under a filtering condition, and/or to detect that the liquid level in the return pool (3) is lower than the second preset liquid level by the second liquid level sensor (32) under a backwashing condition, and to send a message to the alarm device, so that the alarm device gives an alarm.

10. A pool cleaning device according to claim 1, characterised in that the sewage discharge outlet (8) is in communication with the water inlet end of the filtering device, and the water outlet end of the filtering device is in communication with the water return pool (3).

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