CN108222122A - The rain water collecting system and water resource recycling system of a kind of greenhouse - Google Patents

Abstract

The invention discloses a rainwater collection system for a greenhouse and a water resource recycling system. The rainwater collection system includes: a rainwater confluence unit installed on the greenhouse; an initial rainwater disposal device connected to the rainwater confluence unit; a later rainwater collection device connected to the rainwater confluence unit; a sewage pretreatment sequentially connected to the initial rainwater disposal device Pond and vertical flow constructed wetland treatment bed; storage tanks for storing rainwater purified by vertical flow constructed wetland treatment beds and rainwater collected by later rainwater collection devices; used to control initial rainwater abandonment devices or later rainwater A controller for the operation of the collecting device. The present invention utilizes the initial rainwater discarding device to sequentially drain the heavily polluted initial rainwater into the sewage pretreatment tank and the vertical flow artificial wetland treatment bed for purification, thereby greatly improving the water quality of the initial rainwater and enabling the initial rainwater to be utilized. Greatly improved rainwater utilization.

Description

A rainwater collection system for a greenhouse and a water resource recycling system

technical field

The invention belongs to the technical field of greenhouse equipment, and in particular relates to a rainwater collection system and a water resource recycling system for a greenhouse.

Background technique

my country's per capita water resources are scarce, and agricultural water use accounts for a large part of fresh water resources utilization. Rainwater recycling within the scope of plastic greenhouses is of great significance to improving the efficiency of agricultural water use.

Although the water quality of natural rainwater is good, the average COD is 20-60mg/L, and the average SS is less than 20mg/L; however, during the rainfall process, due to the leaching effect of the rainfall on the atmosphere, the surface runoff will affect the sediments on the surface of the underlying surface and the surface buildings. The scouring effect of the decomposed eluate of the material resulted in a high degree of rainwater pollution in the initial stage. With the continuation of the rainfall, the pollutant content in the rainwater runoff gradually decreased and stabilized, and the water quality gradually improved. Utilizing this rainfall law, the rainwater collection system in the prior art usually uses the initial rainwater discarding device to discard the initial rainwater with high pollutant concentration, and then uses the later rainwater collection device to collect the middle and late rainwater.

At present, this rainwater collection system is only used in the rainwater utilization projects of buildings and communities, and has not been popularized in greenhouses; In the short term, the proportion of initial rainwater is relatively large and the proportion of middle and late rainwater is relatively small, which leads to very low utilization rate of rainwater; (2) directly discharging the heavily polluted initial rainwater into the soil is not conducive to environmental protection.

Contents of the invention

The present application provides a rainwater collection system for a greenhouse. The rainwater collection system can simultaneously collect and process initial rainwater and late rainwater, thereby improving the rainwater utilization rate.

A rainwater collection system for a greenhouse, comprising:

Rainwater confluence unit installed on the greenhouse;

An initial rainwater abandonment device connected to the rainwater confluence unit;

A later stage rainwater collection device connected with the rainwater confluence unit;

A sewage pretreatment tank and a vertical flow artificial wetland treatment bed sequentially connected to the initial rainwater abandonment device;

A storage tank for storing rainwater purified by the vertical flow artificial wetland treatment bed and rainwater collected by the later rainwater collection device;

A controller for controlling the operation of the initial rainwater abandonment device or the later rainwater collection device.

The present invention utilizes the initial rainwater discarding device to sequentially drain the heavily polluted initial rainwater into the sewage pretreatment tank and the vertical flow artificial wetland treatment bed for purification, thereby greatly improving the water quality of the initial rainwater and enabling the initial rainwater to be utilized. Greatly improved rainwater utilization.

Preferably, the vertical flow constructed wetland treatment bed includes at least two vertical flow constructed wetlands in series, all vertical flow constructed wetlands are on the same level, and two adjacent vertical flow constructed wetlands are connected by siphon pipes Pass.

The present invention puts all the vertical flow artificial wetlands on the same level, so there is no need to dig deep pits when constructing the vertical flow artificial wetland treatment bed, which reduces the construction cost; at the same time, two adjacent vertical flow artificial wetlands are connected in series through siphon pipes , the water at the bottom of the upstream vertical flow constructed wetland is absorbed by the siphon pipe and then enters the upper layer of the downstream vertical flow constructed wetland. Since the water absorption process of the siphon pipe is slow, the initial rainwater stays in the vertical flow constructed wetland. The time is effectively extended , improving the decontamination efficiency of initial rainwater.

As a further preference, the vertical flow artificial wetland treatment bed includes an anti-seepage layer at the bottom of the bed, and the anti-seepage layer is provided with at least one vertical partition, and the vertical partition divides the bed of the vertical flow artificial wetland treatment bed. The space is divided into at least two vertical flow constructed wetlands, and each vertical flow constructed wetland is filled with fine sand layer, filler layer and soil layer sequentially from bottom to top;

The siphon pipe is arranged in the vertical partition, the water inlet end of the siphon pipe is in the fine sand layer of the upstream vertical flow constructed wetland, and the water outlet end of the siphon pipe is in the downstream vertical flow constructed wetland. above the soil layer.

A filter tip can be provided at the water inlet end of the siphon pipe to prevent fine sand from clogging the siphon pipe.

In the present invention, the pretreatment tank is an activated sludge reactor for treating the initial rainwater discharged from the initial rainwater abandonment device; the activated sludge reactor includes a pool body, and the pool body The top of the tank is provided with a water inlet connected to the initial rainwater discarding device, and the side walls at the bottom of the pool are respectively provided with a mud discharge port and a water outlet connected with the vertical flow artificial wetland treatment bed.

As a preference, the mud discharge port and the water outlet are arranged opposite to each other, and the height of the mud discharge port is lower than that of the water outlet, and the bottom of the pool body is provided with a Curved sliding surface extended on one side. The arc-shaped sliding surface is beneficial to make the sediment produced in the pretreatment tank and the activated sludge with low activity gather more easily at the sludge discharge port, so as to improve the discharge and cleaning efficiency of the sediment and sludge.

Preferably, the top of the activated sludge reactor is provided with an aeration device for introducing air into the tank body.

As a preference, the vertical flow artificial wetland treatment bed is also used to purify the rainwater collected by the later rainwater collection device;

The outlet water of the sewage pretreatment tank is connected to the upstream of the vertical flow constructed wetland treatment bed, and the outlet water of the later rainwater collection device is connected to the middle and downstream of the vertical flow constructed wetland treatment bed.

In order to save resources and reduce the workload of the vertical flow constructed wetland treatment bed, water quality monitoring equipment can be installed between the later stage rainwater collection device and the vertical flow constructed wetland treatment bed. The rainwater collected by the rainwater collection device is purified. If purification is required, the later rainwater collection device is connected to the vertical flow artificial wetland treatment bed; if no purification is required, the rainwater collected by the later rainwater collection device is directly passed into the storage tank. middle.

In the present invention, the rainwater confluence unit includes:

Vaulted roof;

Two rainwater collection tanks respectively arranged at the bottom of the curved surface of the arched roof;

A T-shaped or Y-shaped manifold connected to the ends of the two rainwater collection tanks;

The rainwater collecting tank is arranged obliquely from the end away from the confluence pipe to the end close to the confluence pipe.

The arched roof helps rainwater to enter the rainwater collection tank faster, and the inclined rainwater collection tank also facilitates the rainwater to quickly enter the confluence pipe.

The invention also provides a water resource recycling system for the greenhouse. The water resource recycling system includes the rainwater collection system, and a heating and humidifying system for increasing the temperature and humidity in the greenhouse, the heating and humidifying system includes a heating unit and a humidifying unit, and the heating unit includes an air intake pipe connected to the greenhouse way, the humidification unit includes:

an inlet pump connected to the reservoir of the rainwater harvesting system;

Ultrasonic oscillators for converting liquid water into water vapor;

The steam distribution pipeline used to transport water vapor to the greenhouse;

A fan for driving water vapor into the steam distribution pipeline;

The controller is used to control the start and stop of the ultrasonic oscillator.

The system utilizes a good quality water source collected by a rainwater harvesting system as the water supply for the humidification unit.

Preferably, the water resource recycling system further includes a cooling and dehumidification system for reducing the temperature and/or humidity in the greenhouse, the cooling and dehumidification system includes an exhaust pipeline, one end of the exhaust pipeline is connected to the The greenhouse is connected, and the other end is connected with the inlet end of the cooling and dehumidification chamber. The cooling and dehumidification chamber is provided with a condenser, and the outlet end of the cooling and dehumidification chamber is connected with the air inlet pipeline;

A water storage tank for collecting condensed water condensed on the condenser is connected to the bottom of the cooling and dehumidification chamber, and the water storage tank is connected with the vertical flow constructed wetland treatment bed or the storage tank of the rainwater collection system. In this way, the purification equipment in the rainwater collection system can be used to purify the condensed water generated in the cooling and dehumidification system, and it is also convenient to collect the condensed water for future use.

Preferably, the water resource recycling system further includes an irrigation system for irrigating the crops in the greenhouse, and the irrigation system is connected to the water storage tank of the rainwater collection system.

Compared with the prior art, the beneficial effects of the present invention are reflected in:

(1) The rainwater collection system of the present invention utilizes the initial rainwater abandonment device to discharge the polluted relatively large initial rainwater into the sewage pretreatment tank and the vertical flow artificial wetland treatment bed successively for purification, thereby greatly improving the water quality of the initial rainwater, making The initial rainwater can also be utilized, which greatly improves the utilization rate of rainwater.

(2) The rainwater collection system of the present invention puts all the vertical flow artificial wetlands on the same level, so there is no need to dig deep pits when constructing the vertical flow artificial wetland treatment bed, which reduces the construction cost; at the same time, two adjacent vertical flow artificial wetlands They are connected in series through siphon pipes. The water at the bottom of the upstream vertical flow constructed wetland is absorbed by the siphon pipe and then enters the upper layer of the downstream vertical flow constructed wetland. Since the water absorption process of the siphon pipe is slow, the initial rainwater is in the vertical flow constructed wetland. The time of staying in the medium is effectively extended, and the decontamination efficiency of the initial rainwater is improved.

(3) The water resource recycling system of the present invention uses the purified water collected by the rainwater collection system to increase the humidity in the greenhouse and to irrigate the crops in the greenhouse, and also utilizes the rainwater collection system to purify the condensed water produced in the cooling and dehumidification system And/or savings, greatly improving the water recycling rate around the greenhouse.

Description of drawings

Fig. 1 is the structural representation of the water resource recycling system of a kind of greenhouse of the present invention;

Fig. 2 is a structural schematic diagram of the rainwater collection tank in Fig. 1 under another viewing angle;

3 is a structural schematic diagram of a water resource recycling system for a greenhouse in another perspective according to the present invention;

Figure 4 is an enlarged view of the pretreatment system in Figure 3;

Figure 5 is an enlarged view of the humidification chamber in Figure 1;

Figure 6 is an enlarged view of the cooling and dehumidification chamber in Figure 1;

Fig. 7 is a structural schematic view of the steam distribution pipeline in Fig. 1 from another perspective;

Detailed ways

The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

As shown in Fig. 1 and Fig. 2 and Fig. 3, the water resource recycling system of the greenhouse of the present embodiment includes a rainwater collection system 1, and the rainwater collection system 1 includes the arched roof 10 of the greenhouse 2, and the arched roof The bottom end of the curved surface of 10 is respectively provided with a bar-shaped rainwater collection tank 11, one of the ends of the two rainwater collection tanks 11 is connected with the T-shaped confluence pipe 12, and the rainwater collection tank 11 is from one end away from the confluence pipe 12 to the One end close to the manifold 12 is inclined.

As shown in Figure 2, in addition to setting a rainwater collection tank 11 at the bottom of the arc surface of the arch roof 10, a rainwater collection tank 11 can also be provided at one end of the greenhouse 2 opposite to the confluence pipe 12, and the rainwater collection tank 11 The two ends are respectively connected with two rainwater collection tanks 11 at the bottom of the curved surface of the arch roof 10, and the three rainwater collection tanks 11 and the confluence pipe 12 are connected to form a "back"-shaped rainwater confluence unit.

It can be seen from Fig. 3 that the confluence pipe 12 is connected with the initial rainwater abandonment device 3, and the initial rainwater abandonment device 3 can be a flow-type initial rainwater abandonment device, which is measured by using an intelligent flowmeter The amount of rainwater runoff, and the controller completes the abandonment according to the established programming; this equipment is the prior art, and this embodiment will not repeat it; of course, those skilled in the art can also choose other initial rainwater abandonment devices according to needs.

As shown in FIG. 4 and in conjunction with FIG. 3 , the initial rainwater discarded by the initial rainwater discarding device 3 enters the pretreatment tank 4 through the first water inlet pipe 30 , and the first water pump 31 is arranged on the first water inlet pipe 30 . In this embodiment, the pretreatment tank 4 is an activated sludge reactor for treating initial rainwater. The activated sludge reactor includes a tank body 40 , the top of the tank body 40 is provided with a water inlet connected to the first water inlet pipe 30 , and the side walls at the bottom of the tank body 40 are respectively provided with a sludge outlet 41 and a water outlet 42 .

In this embodiment, the mud discharge port 41 and the water outlet 42 are arranged oppositely, and the height of the mud discharge port 41 is lower than that of the water outlet 42. 41 an arc-shaped sliding surface 43 extending on one side; a sludge collection box 44 connected to the sludge discharge port 41 is provided outside the pool body 40 .

The top of the pool body 40 is also provided with an aeration device 45 for introducing air into the pool body 40, and the aeration device 45 also has a stirring function.

The water outlet 42 of the pool body 40 is connected to the vertical flow artificial wetland treatment bed 5 through a communication pipe 46, and a second water pump 47 and a first water outlet detection device 48 are sequentially installed on the communication pipe 46. The first effluent detection device 48 is used to detect the effluent quality of the pretreatment tank 4. If it is detected that the effluent quality is not suitable for entering the vertical flow artificial wetland treatment bed 5, the controller will open the first valve 49 and the third water pump 410 to pre- The outlet water of the treatment tank 4 will enter the return pipe 411, and return to the water inlet through the return pipe 411 for further treatment.

As shown in Figure 3, in this embodiment, the vertical flow artificial wetland treatment bed 5 includes an anti-seepage layer 51 at the bottom of the bed, and at least one vertical partition 52 is arranged on the anti-seepage layer 51, and the vertical partition 52 will The bed space of the vertical flow constructed wetland treatment bed 5 is divided into at least two vertical flow constructed wetlands 53, and each vertical flow constructed wetland 53 is filled with a fine sand layer 54, a filler layer 55 and a soil layer in sequence from bottom to top 56; All vertical flow constructed wetlands 53 are on the same level, and two adjacent vertical flow constructed wetlands 53 are connected in series through siphon pipes 57 .

The siphon pipe 57 is set in the vertical partition 52, the water inlet end of the siphon pipe 57 is in the fine sand layer 54 of the upstream vertical flow constructed wetland 53, and the water outlet end of the siphon pipe 57 is in the downstream vertical flow constructed wetland 53 above the soil layer 56 . Moreover, in order to prevent the siphon pipe 57 from being blocked, the water inlet end of the siphon pipe 57 also has a filter 58 .

After successively processed by each vertical flow constructed wetland 53 connected in series, the treated water is first collected into the detection pool 59 by the siphon pipe 57, and the second water discharge detection device 510 installed in the detection pool 59 detects the water discharge, and the qualified discharge water It can be discharged from the outlet pipe 512 to the reservoir 513 under the action of the fourth water pump 511 ;

As shown in Figure 3, the middle and late rainwater that flows in from the manifold 12 then enters in the clean water pipe 6 under the effect of the fifth water pump 60, and the third water outlet detection device 61 detects the rainwater in the clean water pipe 6, if it reaches If the drainage standard of the second water outlet detection device 510 is met, the rainwater will directly enter the reservoir 513 from the first water purification branch pipe 62; Enter the middle and lower reaches of the vertical flow constructed wetland treatment bed 5 for further purification. Both the first water purification branch pipe 62 and the second water purification branch pipe 63 are equipped with a second valve 64 , and the controller is also used to control the opening and closing of the two second valves 64 according to the detection result of the third water outlet detection device 61 .

As shown in Figure 1, the water resource recycling system of the greenhouse of the present embodiment also includes a temperature and humidity sensor 20 for detecting the temperature and humidity in the greenhouse, a heating and humidifying system for increasing the temperature and humidity in the greenhouse, and a heating and humidifying system for reducing the temperature and humidity in the greenhouse. The temperature and/or humidity cooling and dehumidification system 7, the controller is also used to receive the detection signal of the temperature and humidity sensor 20 and control the heating and humidification system or the cooling and dehumidification system 7 to work according to the detection results.

In this embodiment, temperature and humidity sensors 20 are respectively arranged at different heights in the greenhouse to improve the detection accuracy of the temperature and humidity sensors 20, and also facilitate independent temperature and humidity detection and adjustment of the air layer at each height of the greenhouse 2.

As shown in FIG. 1 and in conjunction with FIG. 5 , the heating and humidifying system includes a humidifying unit 7 . The humidification unit 7 includes a humidification chamber 70 and a second water inlet pipe 71, the second water inlet pipe 71 is connected to the reservoir 513 and the sixth water pump 72 is installed, and the humidification chamber 70 is installed with the second water inlet pipe 71. The ultrasonic oscillator 73 for converting liquid water into water vapor; the top of the humidification chamber 70 is connected with a steam distribution pipeline for delivering water vapor to the greenhouse 2, and between the steam distribution pipeline and the ultrasonic oscillator 73, humidification The room is also provided with a filter layer 74 for removing bacteria in the water vapor (to prevent bacteria from harming the plants in the greenhouse) and a first blower fan 75 that drives water vapor into the steam distribution pipeline.

In addition to being used for the humidification unit 7, the water stored in the reservoir 513 can also be connected with the watering system for irrigating crops in the greenhouse 2 for watering the crops.

As shown in Figure 5 and in conjunction with Figure 7, it can be seen that in this embodiment, the steam distribution pipeline includes a vertically arranged steam distribution main pipe 76, and this steam distribution main pipe 76 is connected with a plurality of steam distribution branch pipes 77 (in this embodiment Three) are set), all steam distribution branch pipes 77 are arranged in a ring or U shape around the inner peripheral wall of booth 2 but are located at different heights, and every steam distribution branch pipe 77 is provided with some steam distribution holes 78.

In this embodiment, each steam distribution branch pipe 77 is provided with two rows of steam distribution holes 78, and the openings of the two rows of steam distribution holes 78 are respectively arranged obliquely downward or upward. In this way, the water vapor diffusion range of the steam distribution hole can be enlarged. Moreover, the steam distribution main pipe 76 or the steam distribution branch pipe 77 is provided with a third valve 79 for controlling the steam distribution state of the corresponding steam distribution branch pipe 77, and the controller is used to control each third valve according to the detection signals of the temperature and humidity sensors at different heights. The opening and closing of valve 79. Compared with setting the third valve 79 on the steam distribution branch pipe 77, setting the third valve 79 on the steam distribution main pipe 76 can shorten the ineffective travel of water vapor in the steam distribution main pipe 76, reduce the ultrasonic oscillator 73 and the first fan. 75 energy consumption.

As shown in FIG. 1 , the heating and humidifying system includes a heating unit 8 . The heating unit 8 includes an air intake pipeline, which includes a vertical intake main pipe 80, and multiple groups of air intake branch pipes 81 connected to the air intake main pipe 80 (three groups are provided in this embodiment), each The air inlets of the group air intake branch pipes 81 are all located on the side walls of the greenhouse 2 but at different heights, and the same group of air intake branch pipes 81 are arranged in parallel and have at least two. Each air intake branch pipe 81 is provided with a heater 82 and a second fan 83; the controller is used to control the start and stop of each heater 82 and the second fan 83. When the temperature and humidity sensor 20 detects that the temperature in the greenhouse 2 is low, the controller turns on the heater 82 and the corresponding second fan 83 .

As shown in Figure 1 and in conjunction with Figure 6, it can be seen that the cooling and dehumidification system 9 includes an exhaust pipeline, and the exhaust pipeline includes a vertically arranged exhaust main pipe 90, and multiple groups of exhaust branch pipes connected to the exhaust main pipe 90 91 (the present embodiment is provided with three groups), the exhaust port of every group of exhaust branch pipe 91 is all on booth 2 sidewalls but is located at different heights, and the same group of exhaust branch pipes 91 is arranged in parallel and has at least two.

The other end of the total exhaust pipe 90 is connected to the intake end of the cooling and dehumidifying chamber 92, and the cooling and dehumidifying chamber 92 is provided with a condenser 93, and the condenser 93 is connected with the compressor 94 and the heat exchanger 95 outside the cooling and dehumidifying chamber 92. The safety valve 96 is connected in sequence through the refrigerant circulation pipeline 97; the outlet end of the condenser 93 is connected with an outlet pipe 98, and the outlet pipe 98 communicates with the intake main pipe 80 through the first outlet branch pipe 99 and the second outlet branch pipe 910 respectively , wherein, the second air outlet branch pipe 910 passes through the heat exchanger 95; the first air outlet branch pipe 99 and the second air outlet branch pipe 910 are provided with a fourth valve 911, and the controller is also used to control the first air outlet branch pipe 99 and the second air outlet branch pipe The fourth valve 911 on 910 is opened and closed under different conditions.

As shown in FIG. 1 , each branch exhaust pipe 91 is provided with a third fan 912 , and the controller is also used to control the start and stop of the third fan 912 under different circumstances.

When the temperature and humidity sensor 20 detects that the temperature and/or humidity in the greenhouse 2 are too high, the controller starts the third fan 912 and the compressor 94, and the compressor 94 compresses the refrigerant gas in the refrigerant circulation pipeline 97 to make the refrigerant gas When the pressure and temperature rise, the high-temperature refrigerant flows through the heat exchanger 95, and the heat is taken away by the gas in the heat exchanger 95 and the second outlet pipe 910, and the refrigerant is cooled and liquefied. When the high-pressure liquid refrigerant flows When passing through the safety valve 96, it flows from the high-pressure area to the low-pressure area, causing the liquid refrigerant to rapidly expand and evaporate. During the evaporation process, it flows through the condenser 93 and absorbs the heat of the high-temperature and high-humidity gas entering the cooling and dehumidification chamber 92, thereby reducing The temperature of the high-temperature and high-humidity gas condenses water vapor, and finally the gas flowing out from the outlet end of the cooling dehumidification chamber 92 is low-temperature and low-humidity air; the low-temperature and low-humidity air can return to the main intake pipe through the first outlet branch pipe 99 or the second outlet branch pipe 910 In 80, when the low-temperature and low-humidity air needs to be heated, the controller opens the fourth valve 911 of the second air outlet branch pipe 910, and when the low-temperature and low-humidity air does not need to be heated, the controller opens the fourth valve of the first air outlet branch pipe 99 911; the second outlet branch pipe 910 and the heater 82 can be used alone or in combination.

The bottom of the cooling and dehumidifying chamber 92 is also connected with a water storage tank 913; the water storage tank 913 is used to receive the water droplets condensed on the surface of the condenser 93, and the drain pipe 914 of the water storage tank 913 is provided with a fourth water outlet detection device, and the fourth water outlet detection device Detect the water in the drainage pipe, if the drainage standard of the second water outlet detection device is reached, the water will directly enter the reservoir from the first branch drainage pipe; if the drainage standard of the second water outlet detection device is not reached, the water will flow from the The second drainage branch pipe enters the middle and lower reaches of the vertical flow constructed wetland treatment bed for further purification. Fifth valves are installed on both the first drainage branch pipe and the second drainage branch pipe, and the controller is also used to control the opening and closing of the two fifth valves according to the detection result of the fourth water outlet detection device.

Claims (10)

1. A rainwater collection system for a greenhouse, characterized in that it comprises: Rainwater confluence unit installed on the greenhouse; An initial rainwater abandonment device connected to the rainwater confluence unit; A later stage rainwater collection device connected with the rainwater confluence unit; A sewage pretreatment tank and a vertical flow artificial wetland treatment bed sequentially connected to the initial rainwater abandonment device; A storage tank for storing rainwater purified by the vertical flow artificial wetland treatment bed and rainwater collected by the later rainwater collection device; A controller for controlling the operation of the initial rainwater abandonment device or the later rainwater collection device. 2. The rainwater collection system of the greenhouse as claimed in claim 1, wherein the vertical flow constructed wetland treatment bed comprises at least two vertical flow constructed wetlands connected in series, and all vertical flow constructed wetlands are at the same level Above, two adjacent vertical flow constructed wetlands are connected through siphon pipes. 3. The rainwater collection system of the greenhouse as claimed in claim 2, wherein the vertical flow artificial wetland treatment bed comprises an anti-seepage layer at the bottom of the bed, and at least one vertical partition is arranged on the anti-seepage layer , the vertical partition divides the bed space of the vertical flow constructed wetland treatment bed into at least two vertical flow constructed wetlands, and each vertical flow constructed wetland is filled with fine sand layer, filler layer and soil in sequence from bottom to top Floor; The siphon pipe is arranged in the vertical partition, the water inlet end of the siphon pipe is in the fine sand layer of the upstream vertical flow constructed wetland, and the water outlet end of the siphon pipe is in the downstream vertical flow constructed wetland. above the soil layer. 4. The rainwater collection system of the greenhouse according to any one of claims 1 to 3, wherein the pretreatment pool is an active pool for treating the initial rainwater discharged from the initial rainwater discharge device. Sludge reactor; the activated sludge reactor includes a pool body, the top of the pool body is provided with a water inlet connected to the initial rainwater discarding device, and the side walls at the bottom of the pool body are respectively provided with drains A mud outlet and a water outlet connected with the vertical flow constructed wetland treatment bed. 5. The rainwater collection system of a greenhouse as claimed in claim 4, wherein the mud discharge port and the water outlet are relatively arranged, and the height of the mud discharge port is lower than the height of the water outlet, and the pool body The bottom is provided with an arc-shaped sliding surface extending from the side of the water outlet to the side of the mud discharge outlet. 6. The rainwater collection system for a greenhouse as claimed in any one of claims 1 to 3, wherein the vertical flow artificial wetland treatment bed is also used to purify the rainwater collected by the later rainwater collection device; The outlet water of the sewage pretreatment tank is connected to the upstream of the vertical flow constructed wetland treatment bed, and the outlet water of the later rainwater collection device is connected to the middle and downstream of the vertical flow constructed wetland treatment bed. 7. The rainwater collection system for a greenhouse according to any one of claims 1 to 3, wherein the rainwater confluence unit comprises: Vaulted roof; Two rainwater collection tanks respectively arranged at the bottom of the curved surface of the arched roof; A T-shaped or Y-shaped manifold connected to the ends of the two rainwater collection tanks; The rainwater collecting tank is arranged obliquely from the end away from the confluence pipe to the end close to the confluence pipe. 8. A water resource recycling system for a greenhouse, characterized in that it includes a rainwater collection system as described in any one of claims 1 to 7, and a heating and humidifying system for increasing the temperature and humidity in the greenhouse, and the heating and humidifying system It includes a heating unit and a humidifying unit, the heating unit includes an air intake pipeline connected to the greenhouse, and the humidifying unit includes: an inlet pump connected to the reservoir of the rainwater harvesting system; Ultrasonic oscillators for converting liquid water into water vapor; The steam distribution pipeline used to transport water vapor to the greenhouse; A fan for driving water vapor into the steam distribution pipeline; The controller is used to control the start and stop of the ultrasonic oscillator. 9. The water resource recycling system of a greenhouse as claimed in claim 8, further comprising a cooling and dehumidification system for reducing temperature and/or humidity in the greenhouse, said cooling and dehumidification system comprising an exhaust pipeline, One end of the exhaust pipeline is connected to the greenhouse, and the other end is connected to the air inlet of the cooling and dehumidifying chamber. A condenser is arranged in the cooling and dehumidifying chamber. road connected; A water storage tank for collecting condensed water condensed on the condenser is connected to the bottom of the cooling and dehumidification chamber, and the water storage tank is connected with the vertical flow constructed wetland treatment bed or the storage tank of the rainwater collection system. 10. The water resource recycling system of the greenhouse as claimed in claim 8, further comprising an irrigation system for irrigating the crops in the greenhouse, the irrigation system and the water storage tank of the rainwater collection system connected.