An overflow-type large-circulation deodorization device for livestock breeding buildings

By using an overflow-type large-circulation deodorization device, the problem of high energy consumption, low chemical efficiency, and water waste in deodorization systems in multi-story aquaculture buildings is solved by utilizing the gravity flow of the deodorized water and the rational delivery of chemicals, thus achieving a high-efficiency and low-cost deodorization effect.

CN224942404UActive Publication Date: 2026-11-06GUANGZHOU YUEXIU AGRI & ANIMAL HUSBANDRY FOOD TECH CO LTD
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Patent Information

Application Number
CN202522696865.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-12-19
Publication Date
2026-11-06
Estimated Expiration
2035-12-19

AI Technical Summary

Technical Problem

Existing deodorization systems in multi-story livestock buildings suffer from redundant equipment, high energy consumption, serious water waste, and low efficiency of deodorizing agents, failing to meet the demand for efficient deodorization.

Method used

An overflow-type large-circulation deodorization device is adopted. Through the combination of a circulating water tank, deodorizing wet curtain, water supply network and chemical dosing network, the deodorizing water is used to flow by gravity, reducing energy consumption. The deodorizing agent is delivered to the wet curtain before mixing, reducing agent degradation and realizing water resource recycling.

Benefits of technology

It reduced operating costs, improved water resource utilization efficiency, enhanced deodorization effect, reduced the natural degradation of deodorizing agents, and achieved highly efficient deodorization.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model relates to an overflow-type large-circulation deodorization device for livestock breeding buildings, comprising a multi-layered livestock breeding building, a circulating water tank, a deodorizing wet curtain, a deodorizing water pool, a deodorizing water trough, a water supply network, a chemical dosing network, and a return filter network. The beneficial effects are: reducing the energy consumption required for deodorizing water transportation; reducing the time for the deodorizing agent to mix with the deodorizing water before entering the deodorizing wet curtain, reducing the natural degradation of the deodorizing agent in the deodorizing water, and ensuring the actual concentration and activity of the deodorizing agent when the deodorizing water reaches the deodorizing wet curtain; and recycling the collected deodorizing water back to the circulating water tank for reuse.
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Description

Technical Field

[0001] This utility model relates to the field of deodorization technology for livestock breeding buildings, and in particular to an overflow-type large-circulation deodorization device for livestock breeding buildings. Background Technology

[0002] With the development of intensive farming technology, multi-story building farming is becoming increasingly popular. These buildings have compact spaces, high stocking densities, and produce high concentrations and large volumes of odors, placing higher demands on the efficiency and energy consumption of deodorization systems.

[0003] Currently, deodorization solutions for multi-story livestock farms mostly employ independent spray systems for each floor or single-floor treatment methods. These traditional methods have significant drawbacks:

[0004] 1. Redundant equipment and high energy consumption: Each floor requires an independent water pump and water supply pipeline, resulting in a large total installed power and high operating power consumption.

[0005] 2. Serious waste of water resources: Each system operates independently and discharges water directly or after simple treatment, which makes it impossible to recycle water resources and results in a large consumption of fresh water.

[0006] 3. Low efficiency of deodorizing agents: After the deodorizing agent is mixed with water, it is transported to each spray point over a long distance by a water pump. During this process, the effective components of the agent undergo natural degradation due to the excessive residence time in the water, resulting in a significant reduction in the actual concentration and activity when it reaches the deodorizing filter wall, which seriously affects the final deodorization effect.

[0007] Therefore, there is a need for a deodorization device that can reduce operating costs, improve water resource utilization efficiency, reduce the degradation of deodorizing agents, and is suitable for multi-story aquaculture buildings. Utility Model Content

[0008] The purpose of this utility model is to overcome the above-mentioned problems in the existing technology and provide an overflow-type large-circulation deodorization device for livestock breeding buildings.

[0009] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution:

[0010] An overflow-type large-circulation deodorization device for livestock breeding buildings includes a multi-story livestock breeding building, and further includes:

[0011] A circulating water tank is used to store the returned deodorized water, and the circulating water tank is located outside the livestock breeding building;

[0012] The deodorizing wet curtain is used for deodorizing water and odorous gas through gas-liquid exchange. The deodorizing wet curtain is installed on each floor of the livestock breeding building. An overflow trough suspended at the bottom of the floor slab is set directly above the deodorizing wet curtain on each floor of the livestock breeding building. A deodorizing water pool is set below the deodorizing wet curtain on the first floor of the livestock breeding building to collect the deodorizing water flowing down from the deodorizing wet curtain. The deodorizing water pool is connected to the circulating water pool through a return filter network. A deodorizing water trough is set below the deodorizing wet curtain on the second to top floors of the livestock breeding building to collect the deodorizing water flowing down from the deodorizing wet curtain. A drain pipe is set at the bottom of the deodorizing water trough to connect with the overflow trough on the adjacent floor below it.

[0013] A water supply network is used to pump deodorized water from the circulating water tank to the top floor of the livestock breeding building. The water intake pipe of the water supply network is inserted into the circulating water tank, and the water outlet pipe of the water supply network faces the overflow trough located on the top floor of the livestock breeding building.

[0014] The dosing pipeline network is used to deliver deodorizing agents to the second to top floors of the livestock breeding building. The inlet of the dosing pipeline network is connected to a centralized dosing system. The dosing pipeline network is equipped with outlet pipes facing each deodorizing water tank. The dosing pipeline network is also connected to the water supply network located on the top floor of the livestock breeding building.

[0015] The circulating water pool includes multiple individual concrete pools connected in series by connecting pipes.

[0016] The circulating water tank is equipped with a float level switch, and a water supply network is installed on one side of the circulating water tank. The water supply network includes a main water supply pipe and a branch water supply pipe. The outlet of the branch water supply pipe is inserted into the circulating water tank. The main water supply pipe and the branch water supply pipe are connected. An electric shut-off valve is installed on the branch water supply pipe. The float level switch is electrically connected to the electric shut-off valve through a relay circuit.

[0017] The deodorizing wet curtain has a black film installed between its top and the floor slab to prevent odor from escaping.

[0018] The return filtration network includes a return inlet pipe, a filter, and a return outlet pipe. The inlet of the return inlet pipe is installed on the upper part of the wall of the deodorization pool. The outlet of the return inlet pipe is connected to the inlet pipe of the filter. The inlet of the return outlet pipe is connected to the outlet pipe of the filter. The outlet of the return outlet pipe is inserted into the circulating water pool.

[0019] The filter in question is a sand filter.

[0020] The water supply network includes three water pumps, a main water supply pipe, a primary water supply branch pipe, and a secondary water supply branch pipe. Each water pump has a water intake pipe installed at its inlet, which is inserted into a circulating water tank. The outlet of each water pump is connected to the inlet of the main water supply pipe. The secondary water supply branch pipe is connected to the main water supply pipe through the primary water supply branch pipe. The secondary water supply branch pipe is equipped with multiple outlet pipes that face the overflow trough located on the top floor of the livestock breeding building.

[0021] The dosing network includes a main dosing pipe, branch dosing pipes, and injection pipes. The main dosing pipe is connected to the branch dosing pipes. The branch dosing pipes are equipped with multiple outlet pipes facing each deodorization tank. The injection pipes connect the main dosing pipe to the primary water supply branch pipe.

[0022] The centralized dosing system includes a storage tank for storing deodorizing agents and a dosing metering pump. The inlet of the dosing metering pump is connected to the outlet at the bottom of the storage tank, and the outlet of the dosing metering pump is connected to the inlet of the main dosing pipe.

[0023] The beneficial effects of this utility model are:

[0024] The deodorizing water is pumped to the overflow tank on the top floor using the water supply network. The deodorizing water flows from top to bottom through the deodorizing wet curtains set in each floor under its own gravity, reducing the energy consumption required for deodorizing water transportation.

[0025] The deodorizing agent is delivered to the overflow tank and the water supply network located on the top floor of the livestock building through the dosing network. This ensures that the deodorizing agent can mix with the deodorizing water, while reducing the time that the deodorizing agent spends mixing with the deodorizing water before entering the deodorizing wet curtain. This also reduces the natural degradation of the deodorizing agent in the deodorizing water and ensures the actual concentration and activity of the deodorizing agent when the deodorizing water reaches the deodorizing wet curtain.

[0026] The collected deodorized water is returned to the circulating water tank for reuse, reducing water waste and sewage discharge. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of the circulating water deodorization system installed in the livestock breeding building in this utility model;

[0029] Figure 2 This is a schematic diagram of the structure of the circulating water deodorization system installed on the top floor of the livestock breeding building in this utility model;

[0030] Figure 3 This is a schematic diagram of the structure of the circulating water deodorization system installed on the first floor of the livestock breeding building in this utility model;

[0031] Figure 4 This is a schematic diagram of the interconnected structure of the circulating water tank, the return filter network, and the water supply network in this utility model.

[0032] Figure 5 This is a schematic diagram of the water supply network and chemical dosing network in this utility model;

[0033] Figure 6 This is a schematic diagram of the Z-shaped stainless steel plate in this utility model;

[0034] Explanation of the numbers on the map: Livestock breeding building 100,

[0035] Circulating water tank 1, connecting pipe 11, concrete water tank unit 12, waste discharge pipe 13, overflow pipe 14, float level switch 15, main water supply pipe 161, normally open stop valve 1611, water meter 1612, adjustable pressure reducing valve 1613, water supply branch pipe one 162, electric stop valve 1621, normally open stop valve 1622, water supply branch pipe two 163, normally closed stop valve 1631, intermediate relay 17.

[0036] Deodorizing wet curtain 2, black film 21, lower stainless steel square tube 211, upper stainless steel square tube 212,

[0037] Overflow trough 3, Z-shaped stainless steel plate 31, stainless steel threaded rod 32,

[0038] Deodorizing pool 4

[0039] 5. Return filter network 5. Return inlet pipe 51. Filter 52. Return outlet pipe 53.

[0040] Deodorizing water tank 6, drain pipe 61,

[0041] 7. Water supply network; 71. Water pump; 72. Main water supply pipe; 73. Primary water supply branch pipe; 74. Secondary water supply branch pipe; 75. Water intake pipe; 76. Water outlet pipe; 77. Faucet.

[0042] 8. Dosing pipeline network; 81. Dosing main pipe; 82. Dosing branch pipe; 83. Injection pipe; 84. Discharge pipe.

[0043] Centralized dosing system 9, drug storage tank 91, dosing metering pump 92. Detailed Implementation

[0044] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] like Figures 1 to 6As shown, an overflow-type large-circulation deodorization device for livestock breeding buildings includes a multi-story livestock breeding building 100, a circulating water tank 1 for storing and returning deodorizing water, a deodorizing wet curtain 2 for deodorizing water and odorous gas through gas-liquid exchange, a water supply network 7 for pumping the deodorizing water in the circulating water tank 1 to the top floor of the livestock breeding building 100, and a dosing network 8 for delivering deodorizing agents to the second floor to the top floor of the livestock breeding building 100.

[0046] The circulating water pool 1 is located outside the livestock breeding building 100.

[0047] The circulating water tank 1 includes multiple concrete water tank units 12 connected in series by a connecting pipe 11. The connected concrete water tank units 12 are located at the same horizontal level, and the bottom of the connecting pipe 11 is in contact with the inner bottom of the concrete water tank unit 12. A waste discharge pipe 13 is provided at the bottom of one of the concrete water tank units 12, and a waste discharge pipe plug is inserted into the opening of the waste discharge pipe 13 to block the opening of the waste discharge pipe 13. An overflow pipe 14 is provided at the top of one of the concrete water tank units 12, and the top of the inlet end of the overflow pipe 14 is lower than the top of the circulating water tank 1.

[0048] A float level switch 15 is installed in the circulating water tank 1. A water supply network is installed on one side of the circulating water tank 1, including a main water supply pipe 161 and a branch water supply pipe 162. The outlet of the branch water supply pipe 162 is inserted into the circulating water tank 1. The main water supply pipe 161 and the branch water supply pipe 162 are connected. An electric shut-off valve 1621 is installed on the branch water supply pipe 162. The float level switch 15 is electrically connected to the electric shut-off valve 1621 through a relay circuit. The relay circuit includes an intermediate relay 17. The input circuit of the intermediate relay 17 is electrically connected to the float level switch 15 through a wire, and the output circuit of the intermediate relay 17 is electrically connected to the electric shut-off valve 1621 through a wire. The main water supply pipe 161 is connected to the water supply network of the water company. When the liquid level in the circulating water tank 1 is lower than the design height, the float level switch 15 senses the insufficient liquid level and controls the electric shut-off valve 1621 to open through the relay circuit to replenish water to the circulating water tank 1 until the water level in the circulating water tank 1 reaches the design height, at which point the float level switch 15 closes.

[0049] The water supply network also includes a second water supply branch pipe 163 connected to the main water supply pipe 161. The outlet of the second water supply branch pipe 163 is inserted into the circulating water tank 1. A normally closed shut-off valve 1631 is installed on the second water supply branch pipe 163. A normally open shut-off valve 1611, a water meter 1612, and an adjustable pressure reducing valve 1613 are installed on the main water supply pipe 161. A normally open shut-off valve 1622 is also installed on the first water supply branch pipe 162. The normally open shut-off valve 1622 is kept open during normal use. When it is necessary for personnel to manually cut off the water supply to the first water supply branch pipe, the normally open shut-off valve 1622 is closed.

[0050] The deodorizing wet curtain 2 is installed on each floor of the livestock breeding building 100. A low wall is built on each floor of the livestock breeding building 100, and a guide plate with a "Z"-shaped cross section is installed on the top of the low wall. Then the deodorizing wet curtain 2 is installed on the guide plate. A black membrane 21 to prevent odor from overflowing is installed between the top of the deodorizing wet curtain 2 and the floor slab. The specific installation structure is as follows: a lower stainless steel square tube 211 is installed on the top of the deodorizing wet curtain 2, an upper stainless steel square tube 212 is installed at the bottom of the floor slab directly above the lower stainless steel square tube 211, and the upper and lower sides of the black membrane 21 are respectively installed on the upper stainless steel square tube 212 and the lower stainless steel square tube 211.

[0051] Above the deodorizing wet curtain 2 on each floor of the livestock breeding building 100, there is an overflow trough 3 suspended at the bottom of the floor slab. Specifically, a Z-shaped stainless steel plate 31 is installed at the bottom of the floor slab above the deodorizing wet curtain 2 by stainless steel expansion bolts. Two symmetrical stainless steel wire rods 32 are installed on the Z-shaped stainless steel plate 31, and the two sides of the overflow trough 3 are installed on the stainless steel wire rods 32.

[0052] The overflow trough 3 is a rectangular box-shaped structure with an open top. The top of the two long sides of the overflow trough 3 is provided with a serrated overflow weir so that the deodorizing water can overflow evenly onto the deodorizing wet curtain 2.

[0053] The bottom of the overflow tank 3 is provided with a waste discharge port, and a waste discharge port plug is inserted into the waste discharge port to block the waste discharge port.

[0054] Below the deodorizing wet curtain 2 on the first floor of the livestock breeding building 100, there is a deodorizing water tank 4 that receives the deodorizing water flowing down from the deodorizing wet curtain 2. The deodorizing water tank 4 is connected to the circulating water tank 1 through the return filter network 5.

[0055] The return filter network 5 includes a return water inlet pipe 51, a filter 52, and a return water outlet pipe 53. The inlet of the return water inlet pipe 51 is installed on the upper part of the wall of the deodorizing water tank 4. The height difference between the inlet of the return water inlet pipe 53 and the inner bottom of the deodorizing water tank 4 is 300mm. The area in the deodorizing water tank 4 below the inlet of the return water inlet pipe 51 is a sedimentation zone. The outlet of the return water inlet pipe 51 is connected to the inlet pipe of the filter 52, and the inlet of the return water outlet pipe 53 is connected to the outlet pipe of the filter 52. The outlet of the return water outlet pipe 53 is inserted into the circulating water tank 1.

[0056] Filter 52 is a sand filter.

[0057] Below the deodorizing wet curtain 2 located on the second to top floor of the livestock breeding building 100, there is a deodorizing water tank 6 that receives the deodorizing water flowing down from the deodorizing wet curtain 2. At the bottom of the deodorizing water tank 6, there is a drain pipe 61 that is connected to the overflow tank 3 in the adjacent floor below it.

[0058] The water outlet side of the baffle plate faces the deodorization pool 4 or the deodorization trough 6.

[0059] The water intake pipe of the water supply network 7 is inserted into the circulating water pool 1, and the water outlet pipe of the water supply network 7 is directed toward the overflow trough 3 located on the top floor of the livestock breeding building 100.

[0060] The water supply network 7 includes three water pumps 71, a main water supply pipe 72, a primary water supply branch pipe 73, and a secondary water supply branch pipe 74. Each water pump 71 has an intake pipe 75 installed at its inlet, which is inserted into the circulating water tank 1. The outlet of each water pump 71 is connected to the inlet of the main water supply pipe 72. The secondary water supply branch pipe 74 is connected to the main water supply pipe 72 via the primary water supply branch pipe 73. Multiple outlet pipes 76 are installed on the secondary water supply branch pipe 74, pointing towards the overflow trough 3 located on the top floor of the livestock breeding building 100. Each outlet pipe 76 is equipped with a faucet 77. The water pumps 71 are divided into daily operating pumps and standby pumps. The standby pumps are activated when the daily operating pumps malfunction to ensure normal water supply.

[0061] The inlet of the dosing pipeline network 8 is connected to the centralized dosing system 9. The dosing pipeline network 8 is equipped with a dosing pipe facing each deodorizing water tank 6. The dosing pipeline network 8 is also connected to the water supply network 7 located on the top floor of the livestock breeding building 100.

[0062] The chemical dosing network 8 includes a main dosing pipe 81, branch dosing pipes 82, and injection pipes 83. The main dosing pipe 81 is connected to the branch dosing pipes 82. The branch dosing pipes 82 are equipped with multiple outlet pipes 84 leading to each deodorization tank 6. The injection pipes 83 connect the main dosing pipe 81 to the primary water supply branch pipe 83. Both the branch dosing pipes 82 and the injection pipes 83 are equipped with normally open shut-off valves to control their on / off state.

[0063] The centralized dosing system 9 includes a storage tank 91 for storing deodorizing agents and a dosing metering pump 92. The inlet of the dosing metering pump 92 is connected to the outlet at the bottom of the storage tank 91, and the outlet of the dosing metering pump 92 is connected to the inlet of the dosing main pipe 81.

[0064] The water pump delivers the deodorized water from the circulating water tank to the main water supply pipe, and then sequentially through the primary and secondary water supply branch pipes to the outlet pipe, which discharges into the overflow trough located on the top floor of the livestock building. The dosing metering pump pumps the deodorizing agent from the storage tank to the dosing main pipe, and then through the dosing branch pipe into the deodorizing water tanks on each floor to mix with the deodorized water. It also injects the agent into the primary water supply branch pipe through the injection pipe to mix with the deodorized water. Under its own gravity, the deodorized water flows from top to bottom through the deodorizing wet curtain, and then into the deodorizing water tank. It then flows through the drain pipe at the bottom of the deodorizing water tank into the overflow trough of the adjacent floor below, and so on, until the deodorized water flows into the deodorizing water pool on the first floor of the livestock building. The deodorized water in the deodorizing water pool flows into the sand filter through the return inlet pipe, and after being filtered by the sand filter, it flows into the circulating water tank through the return outlet pipe.

[0065] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A large-scale overflow circulation deodorization device for livestock breeding buildings, comprising multi-story livestock breeding buildings, characterized in that, Also includes: A circulating water tank is used to store the returned deodorized water, and the circulating water tank is located outside the livestock breeding building; The deodorizing wet curtain is used for deodorizing water and odorous gas through gas-liquid exchange. The deodorizing wet curtain is installed on each floor of the livestock breeding building. An overflow trough suspended at the bottom of the floor slab is set directly above the deodorizing wet curtain on each floor of the livestock breeding building. A deodorizing water pool is set below the deodorizing wet curtain on the first floor of the livestock breeding building to collect the deodorizing water flowing down from the deodorizing wet curtain. The deodorizing water pool is connected to the circulating water pool through a return filter network. A deodorizing water trough is set below the deodorizing wet curtain on the second to top floors of the livestock breeding building to collect the deodorizing water flowing down from the deodorizing wet curtain. A drain pipe is set at the bottom of the deodorizing water trough to connect with the overflow trough on the adjacent floor below it. A water supply network is used to pump deodorized water from the circulating water tank to the top floor of the livestock breeding building. The water intake pipe of the water supply network is inserted into the circulating water tank, and the water outlet pipe of the water supply network faces the overflow trough located on the top floor of the livestock breeding building. The dosing pipeline network is used to deliver deodorizing agents to the second to top floors of the livestock breeding building. The inlet of the dosing pipeline network is connected to a centralized dosing system. The dosing pipeline network is equipped with outlet pipes facing each deodorizing water tank. The dosing pipeline network is also connected to the water supply network located on the top floor of the livestock breeding building.

2. The large-circulation deodorization device according to claim 1, characterized in that: The circulating water pool comprises multiple individual concrete pools connected in series via connecting pipes.

3. The large-circulation deodorization device according to claim 1, characterized in that: A float level switch is installed in the circulating water tank. A water supply network is installed on one side of the circulating water tank. The water supply network includes a main water supply pipe and a branch water supply pipe. The outlet of the branch water supply pipe is inserted into the circulating water tank. The main water supply pipe and the branch water supply pipe are connected. An electric shut-off valve is installed on the branch water supply pipe. The float level switch is electrically connected to the electric shut-off valve through a relay circuit.

4. The large-circulation deodorization device according to claim 1, characterized in that: A black membrane is installed between the top of the deodorizing wet curtain and the floor slab to prevent odor from escaping.

5. The large-circulation deodorization device according to claim 1, characterized in that: The return filtration network includes a return inlet pipe, a filter, and a return outlet pipe. The inlet of the return inlet pipe is installed on the upper part of the wall of the deodorization pool. The outlet of the return inlet pipe is connected to the inlet pipe of the filter. The inlet of the return outlet pipe is connected to the outlet pipe of the filter. The outlet of the return outlet pipe is inserted into the circulating water pool.

6. The large-circulation deodorization device according to claim 5, characterized in that: The filter is a sand filter.

7. The large-circulation deodorization device according to claim 1, characterized in that: The water supply network includes three water pumps, a main water supply pipe, a primary water supply branch pipe, and a secondary water supply branch pipe. Each water pump has a water intake pipe installed at its inlet, which is inserted into the circulating water tank. The outlet of each water pump is connected to the inlet of the main water supply pipe. The secondary water supply branch pipe is connected to the main water supply pipe through the primary water supply branch pipe. The secondary water supply branch pipe is equipped with multiple outlet pipes that face the overflow trough located on the top floor of the livestock breeding building.

8. The large-circulation deodorization device according to claim 7, characterized in that: The dosing network includes a main dosing pipe, branch dosing pipes, and injection pipes. The main dosing pipe is connected to the branch dosing pipes. The branch dosing pipes are equipped with multiple outlet pipes facing each deodorization tank. The injection pipes connect the main dosing pipe to the primary water supply branch pipe.

9. The large-circulation deodorization device according to claim 8, characterized in that: The centralized dosing system includes a storage tank for storing deodorizing agents and a dosing metering pump. The inlet of the dosing metering pump is connected to the outlet at the bottom of the storage tank, and the outlet of the dosing metering pump is connected to the inlet of the main dosing pipe.