A three-way drip irrigation pipe constant pressure regulating valve and application thereof

Abstract

The application discloses a three-way capillary constant-pressure regulating valve for drip irrigation and application thereof, and belongs to the technical field of drip irrigation, which comprises a pressure regulating cone, a lower shell and an upper shell, wherein the upper shell is arranged on the outer side of the pressure regulating cone, the pressure regulating cone is arranged in the lower shell, and the upper shell is arranged on the outer side of the lower shell. In the application, the pressure regulator can be applied to bidirectional arrangement of branch pipes. In actual application, the investment cost of pipelines and equipment in the drip irrigation system can be greatly reduced, the uniformity of irrigation is ensured, an integrated shell is adopted, main components only include four parts of the pressure regulating cone, a spring, the lower shell and the upper shell, the structure is simple, and installation is convenient. The pressure regulating structure is optimized, compared with the current pressure regulating device, the vertical pressure regulating mode and the chamfered pressure regulating surface design are adopted, the pressure regulating force buffer space is reduced, the pressure regulating surface stress area is increased, the pressure regulating device is more sensitive to pressure change, and the pressure regulating effect is better.

Description

Technical Field

[0001] This invention belongs to the field of agricultural field irrigation control technology, and particularly relates to a drip irrigation valve irrigation control and its technology. Background Technology

[0002] Currently, the single-control area of ​​drip irrigation systems in farmland is gradually expanding, and the material of irrigation branch pipes is also evolving from rigid PE pipes to more conveniently packaged and laid flexible irrigation bags. Large-diameter flexible bags can provide sufficient water to the capillary tubes, allowing the arrangement of capillary tubes to gradually evolve from single-sided to double-sided, significantly reducing the number of branch pipes and lowering the investment cost of the drip irrigation system. As a highly efficient integrated water and fertilizer irrigation technology, drip irrigation benefits from the stability and uniformity of its operation. However, the pressure-bearing capacity of the main pipe, branches, and capillary tubes in a drip irrigation system varies, especially in the capillary tubes, which are more sensitive to pressure changes. Excessive pressure can lead to pipe bursts, while unstable pressure can cause uneven irrigation. Therefore, there is an urgent need for a capillary tube constant pressure regulating valve that can be applied to bidirectional field installations.

[0003] In the prior art, patent number 201520373333.9 discloses a capillary tube inlet pressure regulator that can adjust the water outlet pressure of the capillary tube, but it only has one outlet, and the pressure adjustment direction adopted by the device is horizontal, which cannot meet the needs of bidirectional deployment of drip irrigation system.

[0004] For example, in the existing patent, patent number 202320400640.6 discloses a pressure regulator device. Although it can solve the problem of unstable pressure when using gas and liquid phases at the same time, it still only has one outlet. The structure of this device is also not suitable for the bidirectional arrangement of capillary tubes in drip irrigation systems.

[0005] Existing patent number 201810065504.X discloses a capillary inlet pressure regulator. The pressure regulating component includes an regulating body and a first sleeve. The outer diameter of the regulating body gradually decreases from upstream to downstream. The inner cavity of the downstream shell has a gradient section with an inner diameter that gradually decreases from upstream to downstream, and a first flow channel is formed between the regulating body and the gradient section. A second flow channel is formed between the second sleeve inside the cylindrical section of the downstream shell and the cylindrical section. The first sleeve and the second sleeve are interlocked and have a sealing element, and a spring is provided between them. An air passage is provided at the connection between the second sleeve and the cylindrical section. When the upstream pressure increases, the regulating body moves downstream under the action of water pressure, and the cross-sectional area of ​​the first flow channel decreases. At this time, the head loss increases, thereby maintaining the downstream outlet pressure stable. Although this design can achieve pressure stability, its pressure regulating buffer space is large and it is not sensitive to pressure changes.

[0006] Therefore, there is an urgent need to propose a three-way capillary constant pressure regulating valve for drip irrigation and its application, which can significantly reduce the investment cost of drip irrigation system while ensuring irrigation uniformity. This invention is of great significance to the green and sustainable development of agriculture. Summary of the Invention

[0007] To address the shortcomings of the existing technologies, this invention proposes a three-way capillary constant pressure regulating valve for drip irrigation and its application, based on the perspective of bidirectional capillary arrangement and structural optimization.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a three-way capillary constant pressure regulating valve for drip irrigation, comprising a pressure regulating cone, a lower housing and an upper housing, wherein the upper housing is disposed outside the pressure regulating cone, the pressure regulating cone is disposed inside the lower housing, and the upper housing is sleeved on the outside of the lower housing;

[0009] The pressure regulating cone includes a water inlet chamber, and a water flow chamber is fixedly connected to the upper surface of the water inlet chamber. The water inlet chamber and the water flow chamber are interconnected. The top of the water flow chamber is located in the upper cavity. The upper cavity includes a frustum-shaped pressure regulating surface and a cylindrical vertical surface. The lower surface of the frustum-shaped pressure regulating surface is fixedly connected to the upper surface of the outer cylindrical vertical surface. The top of the water flow chamber penetrates the upper surface of the frustum-shaped pressure regulating surface and forms a water outlet. The frustum-shaped pressure regulating surface is composed of a top horizontal surface and an edge inclined annular surface. The edge inclined annular surface has a first inclination and the inner wall inclined annular surface of the upper shell has a second inclination. The first inclination and the second inclination are parallel to each other, and the projections of the edge inclined annular surface and the inner wall inclined annular surface on the ground are concentric.

[0010] The lower shell includes an outer cavity, with a water inlet fixedly connected to the bottom of the outer cavity. The water inlet is fixedly connected to and communicates with the conical pressure regulating cavity. A partition is fixedly connected to the upper surface of the conical pressure regulating cavity, and an inner cavity is fixedly connected to the upper surface of the partition. Both the conical pressure regulating cavity and the inner cavity are located inside the outer cavity. The left and right sides of the lower side of the outer cavity are fixedly connected to a first liquid outlet and a second liquid outlet, respectively.

[0011] As a further description of the above technical solution:

[0012] The water inlet chamber is inverted cone-shaped, with a water inlet grille at the top.

[0013] As a further description of the above technical solution:

[0014] The water inlet chamber and the conical pressure regulating chamber have the same conical slope angle.

[0015] As a further description of the above technical solution:

[0016] The radius of the frustum-shaped pressure regulating surface is the same as the radius of the outer cylindrical vertical surface.

[0017] As a further description of the above technical solution:

[0018] The outer surface of the outer cylindrical vertical surface is provided with a second sealing ring limiting groove, and a second sealing ring is provided in the second sealing ring limiting groove. The outer surface of the second sealing ring is in contact with the inner wall of the lower housing.

[0019] As a further description of the above technical solution:

[0020] The inner wall of the inner cavity is provided with exhaust holes, which extend to the outer surface of the outer cavity and communicate with the outside. There are multiple exhaust holes, which are symmetrically distributed in the inner cavity. The vertical position of the exhaust holes is located between the upper cavity and the partition.

[0021] As a further description of the above technical solution:

[0022] The partition is annular, and a first sealing ring limiting groove is provided on the inner wall of the partition. A first sealing ring is provided in the first sealing ring limiting groove and is sleeved on the outside of the water flow chamber.

[0023] As a further description of the above technical solution:

[0024] A spring is fitted on the outside of the water flow chamber, and the two ends of the spring are fixedly connected to the lower surface of the cylindrical vertical plane and the upper surface of the partition, respectively.

[0025] As a further description of the above technical solution:

[0026] The upper housing has an internal thread inside, and the lower housing has an external thread on its outer surface. The upper housing is threaded to the outer surface of the lower housing through the external and internal threads.

[0027] The application of a three-way capillary constant pressure regulating valve for drip irrigation specifically includes the following steps:

[0028] S1. Install the three-way capillary constant pressure regulating valve on the branch pipe of the drip irrigation system. The water flows through the inlet into the conical pressure regulating chamber, through the inlet chamber of the pressure regulating cone, along the flow chamber from the outlet into the outer chamber, and finally into the capillary tube along the first and second liquid outlets at the bottom of the outer chamber.

[0029] S2, Balance stage: Before the drip irrigation system starts to pressurize, the spring support force on the pressure regulating cone is balanced with its own weight, and the cross-sectional area of ​​the inlet remains unchanged. During this process, the top surface of the inlet chamber will not contact the bottom surface of the partition.

[0030] S3, Pressurization Stage: When the drip irrigation system starts pressurizing, the pressure in the conical pressure regulating chamber increases, and at the same time, the pressure at the outlet of the upper cavity also gradually increases.

[0031] S4. Critical stage: When the outlet pressure increases to a certain value, the frustum-shaped pressure regulating surface at the top of the pressure regulating cone is pushed by the water pressure, causing the pressure regulating cone to begin to move as a whole in the direction of water inlet.

[0032] S5, Pressure Regulating Stage: At this time, the spring begins to compress, the water inlet chamber gradually approaches the conical pressure regulating chamber, the space between the water inlet chamber and the water inlet decreases, the head loss increases, and the pressure is reduced.

[0033] S6, Pressure Stabilization Stage: At this time, the water pressure in the conical pressure regulating chamber decreases, and the pressure at the outlet of the pressure regulating cone also decreases, thus achieving the effect of pressure stabilization.

[0034] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0035] 1. This invention designs a pressure regulator applicable to bidirectional branch pipe layouts. In practical applications, it can significantly reduce the investment cost of pipelines and equipment in drip irrigation systems while ensuring irrigation uniformity. This invention adopts an integrated shell, with the main components consisting of only four parts: a pressure regulating cone, a spring, a lower shell, and an upper shell. The structure is simple and easy to install. After the water flows in through the inlet of the lower shell, under normal water pressure, the water can flow through the inlet chamber, the outlet, and the outer chamber, and then out through the first and second outlets. Under higher water pressure, the frustum-shaped pressure regulating surface on the upper part of the pressure regulating cone is pushed by the water pressure, causing the pressure regulating cone to move towards the water inlet. This allows the pressure regulating cone to slowly enter the inlet, creating a blocking effect and reducing the water pressure. This reduces the amount of water entering the conical pressure regulating chamber, achieving the goal of controlling the uniform delivery of water. This allows the first and second outlets to uniformly deliver water into the capillary tube, achieving uniform irrigation. Achieving uniform irrigation through a simple structure.

[0036] 2. This invention optimizes the pressure regulating structure. Compared with current pressure regulating devices, this invention adopts a vertical pressure regulating method and a chamfered pressure regulating surface design, which reduces the space for pressure regulation buffering and increases the force-bearing area of ​​the pressure regulating surface, making the pressure regulating device more sensitive to pressure changes and improving the pressure regulating effect. This invention also optimizes the outflow structure. Compared with current pressure regulating devices, this invention has a larger water outlet cavity, which can further stabilize the water pressure before the water flows into the capillary tube, helping to improve the water filling uniformity of the capillary tube.

[0037] 3. The frustum-shaped pressure regulating surface described in this invention consists of a top horizontal surface and an edge inclined annular surface. The edge inclined annular surface has a first inclination and the inner wall inclined annular surface of the upper shell has a second inclination. The first and second inclinations are parallel to each other, and the projections of the edge inclined annular surface and the inner wall inclined annular surface on the ground are concentric. This design allows the water flow to undergo a certain degree of reflection and compression after entering the outer cavity from the outlet along the water flow cavity. This pressure is applied to the frustum-shaped pressure regulating surface on the upper part of the pressure regulating cone by the water pressure, resulting in timely and rapid pressure pushing down. This further reduces the pressure regulating buffer space and increases the force-bearing area of ​​the pressure regulating surface, making the pressure regulating device more sensitive to pressure changes. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of a three-way capillary constant pressure regulating valve for drip irrigation and its application, as proposed in this invention.

[0039] Figure 2 This is an exploded structural diagram of a three-way capillary constant pressure regulating valve for drip irrigation and its application, as proposed in this invention.

[0040] Figure 3 This is a schematic diagram of the structure of the pressure regulating cone in the drip irrigation three-way capillary constant pressure regulating valve and its application, as proposed in this invention.

[0041] Figure 4 This is a schematic diagram of the cross-section of the pressure regulating cone in the drip irrigation three-way capillary constant pressure regulating valve proposed in this invention and its application.

[0042] Figure 5 This is a schematic diagram of the upper and lower shell structure of a three-way capillary constant pressure regulating valve for drip irrigation and its application, as proposed in this invention.

[0043] Figure 6 This is a schematic diagram of the cross-section of the upper and lower shells of a three-way capillary constant pressure regulating valve for drip irrigation proposed in this invention and its application.

[0044] Figure 7 This is a schematic diagram of the upper shell structure of a three-way capillary constant pressure regulating valve for drip irrigation proposed in this invention and its application.

[0045] Figure 8 This is a schematic diagram of the overall product of a three-way capillary constant pressure regulating valve for drip irrigation and its application, as proposed in this invention.

[0046] Figure 9 This is a schematic diagram of the water flow direction of a three-way capillary constant pressure regulating valve for drip irrigation and its application, as proposed in this invention.

[0047] Legend:

[0048] 1. Spring; 2. Pressure regulating cone; 201. Inlet chamber; 202. Flow chamber; 203. Upper cavity; 20301. Second sealing ring limiting groove; 20302. Outlet; 20303. Frustum-shaped pressure regulating surface; 20304. Cylindrical vertical surface; 3. Lower shell; 301. Inlet; 302. Conical pressure regulating cavity; 303. Partition; 30301. First sealing ring limiting groove; 304. Inner cavity; 305. Vent hole; 306. Outer cavity; 307. External thread; 308. First liquid outlet; 309. Second liquid outlet; 4. First sealing ring; 5. Second sealing ring; 6. Upper shell; 601. Internal thread. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] Please see Figure 1-9 The present invention provides a technical solution: a three-way capillary constant pressure regulating valve for drip irrigation, comprising a pressure regulating cone 2, a lower housing 3 and an upper housing 6, wherein the upper housing 6 is disposed outside the pressure regulating cone 2, the pressure regulating cone 2 is disposed inside the lower housing 3, the upper housing 6 is sleeved on the outside of the lower housing 3, the upper housing 6 is provided with an internal thread 601 inside, the lower housing 3 is provided with an external thread 307 on the outer surface, and the upper housing 6 is threadedly connected to the outer surface of the lower housing 3 through the external thread 307 and the internal thread 601;

[0051] The pressure regulating cone 2 includes a water inlet cavity 201, which is an inverted cone shape with a water inlet grille at the top. A flow cavity 202 is fixedly connected to the upper surface of the water inlet cavity 201, and the water inlet cavity 201 and the flow cavity 202 are interconnected. The top of the flow cavity 202 is located in an upper cavity 203, which includes a frustum-shaped pressure regulating surface 20303 and a cylindrical vertical surface 20304. The lower surface of the frustum-shaped pressure regulating surface 20303 and the upper surface of the outer cylindrical vertical surface 20304 are connected. The fixed connection is provided. The radius of the frustum-shaped pressure regulating surface 20303 is the same as the radius of the outer cylindrical vertical surface 20304. The outer surface of the outer cylindrical vertical surface 20304 is provided with a second sealing ring limiting groove 20301. A second sealing ring 5 is provided in the second sealing ring limiting groove 20301. The outer surface of the second sealing ring 5 is in contact with the inner wall of the lower housing 3. The top of the water flow cavity 202 penetrates the upper surface of the frustum-shaped pressure regulating surface 20303 and forms a water outlet 20302.

[0052] The frustum-shaped pressure regulating surface 20303 is composed of a horizontal surface at the top and an inclined annular surface at the edge. The inclined annular surface at the edge has a first inclination and the inclined annular surface on the inner wall of the upper shell 6 has a second inclination. The first inclination and the second inclination are parallel to each other, and the projections of the inclined annular surface at the edge and the inclined annular surface on the ground are concentric. This design allows water to be reflected and squeezed to a certain extent after entering the outer cavity 306 from the outlet 20302 along the water flow cavity 202. The pressure is pushed down by the water pressure on the frustum-shaped pressure regulating surface 20303 on the upper part of the pressure regulating cone 2, which further reduces the pressure regulating buffer space and increases the force-bearing area of ​​the pressure regulating surface. This makes the pressure regulating device more sensitive to pressure changes and improves the pressure regulating effect.

[0053] The lower housing 3 includes an outer cavity 306, with a water inlet 301 fixedly connected to the bottom of the outer cavity 306. The water inlet 301 is fixedly connected to and communicates with a conical pressure regulating cavity 302. The conical slope angle of the water inlet cavity 301 and the conical pressure regulating cavity 302 is the same. A partition 303 is fixedly connected to the upper surface of the conical pressure regulating cavity 302. The partition 303 is annular, and a first sealing ring limiting groove 30301 is formed on the inner wall of the partition 303. A first sealing ring 4 is provided in the first sealing ring limiting groove 30301. The first sealing ring 4 is sleeved on the outside of the water flow cavity 202, isolating... An inner cavity 304 is fixedly connected to the upper surface of plate 303. Both the conical pressure regulating cavity 302 and the inner cavity 304 are located in the outer cavity 306. An exhaust hole 305 is provided on the inner wall of the inner cavity 304. The exhaust hole 305 extends to the outer surface of the outer cavity 306 and communicates with the outside. There are multiple exhaust holes 305, which are symmetrically distributed in the inner cavity 304. The vertical position of the exhaust hole 305 is located between the upper cavity 203 and the partition plate 303. The left and right sides of the lower side of the outer cavity 306 are respectively fixedly connected to the first liquid outlet 308 and the second liquid outlet 309.

[0054] A spring 1 is sleeved on the outside of the water flow cavity 202, and the two ends of the spring 1 are fixedly connected to the lower surface of the cylindrical vertical surface 20304 and the upper surface of the partition 303, respectively.

[0055] The application of a three-way capillary constant pressure regulating valve for drip irrigation specifically includes the following steps:

[0056] S1. Install the three-way capillary constant pressure regulating valve on the branch pipe of the drip irrigation system. The water flows through the inlet 301 into the conical pressure regulating chamber 302, through the inlet chamber 201 of the pressure regulating cone 2, and along the flow chamber 202 from the outlet 20302 into the outer chamber 306. Finally, it enters the capillary tube along the first liquid outlet 308 and the second liquid outlet 309 at the bottom of the outer chamber 306.

[0057] S2, Balance stage: Before the drip irrigation system starts to pressurize, the supporting force of the spring 1 on the pressure regulating cone 2 is balanced with its own weight, and the cross-sectional area of ​​the inlet 301 remains unchanged. During this process, the top surface of the inlet chamber 201 will not contact the bottom surface of the partition 303.

[0058] S3, Pressurization stage: When the drip irrigation system starts pressurization, the pressure in the conical pressure regulating chamber increases, and at the same time, the pressure at the outlet 20302 of the upper cavity 203 also gradually increases.

[0059] S4. Critical stage: When the pressure at the outlet 20302 increases to a certain value, the frustum-shaped pressure regulating surface 20303 on the upper part of the pressure regulating cone 2 is pushed by the water pressure, causing the pressure regulating cone 2 to start moving as a whole in the direction of water inlet;

[0060] S5, Pressure regulation stage: At this time, spring 1 begins to compress, and the water inlet chamber 201 gradually approaches the conical pressure regulating chamber 302. The space between the water inlet chamber 201 and the water inlet 301 decreases, and the head loss increases, which plays the role of reducing pressure.

[0061] S6, Pressure Stabilization Stage: At this time, the water pressure in the conical pressure regulating chamber 302 decreases, and the pressure at the outlet 20302 of the pressure regulating cone 2 also decreases, thus achieving the effect of pressure stabilization.

[0062] This solution optimizes the structure of the pressure regulating device based on actual application scenarios, reducing the number of parts and improving its sensitivity to pressure changes. This enhances the stability of the water flow at the device's outlet 20302, which is crucial for improving the uniformity of irrigation in the drip irrigation system's capillary tubes. Furthermore, the three-way capillary tube constant pressure regulating valve proposed in this invention can meet the pressure stabilization requirements of bidirectional laying of a single branch pipe. While significantly reducing investment in branch pipes and related equipment, it provides constant pressure for bidirectionally laid capillary tubes, further extending the laying distance, improving irrigation uniformity, and expanding the single-control area of ​​the drip irrigation system. This is of great significance for the efficient utilization of agricultural water resources and the green and sustainable development of agricultural resources.

[0063] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A three-way capillary constant pressure regulating valve for drip irrigation, comprising a pressure regulating cone (2), a lower housing (3), and an upper housing (6), characterized in that, The upper housing (6) is located on the outside of the pressure regulating cone (2), the pressure regulating cone (2) is located inside the lower housing (3), and the upper housing (6) is sleeved on the outside of the lower housing (3); The pressure regulating cone (2) includes a water inlet chamber (201), and a water flow chamber (202) is fixedly connected to the upper surface of the water inlet chamber (201). The water inlet chamber (201) and the water flow chamber (202) are interconnected. The top of the water flow chamber (202) is located in the upper cavity (203). The upper cavity (203) includes a frustum-shaped pressure regulating surface (20303) and a cylindrical vertical surface (20304). The lower surface of the frustum-shaped pressure regulating surface (20303) and the upper surface of the outer cylindrical vertical surface (20304) are connected. The top of the water flow chamber (202) penetrates the upper surface of the frustum-shaped pressure regulating surface (20303) and forms an outlet (20302). The frustum-shaped pressure regulating surface (20303) is composed of a horizontal surface at the top and an inclined annular surface at the edge. The inclined annular surface at the edge has a first inclination and the inclined annular surface at the inner wall of the upper shell (6) has a second inclination. The first inclination and the second inclination are parallel to each other and the projections of the inclined annular surface at the edge and the inclined annular surface at the inner wall on the ground are concentric. The lower shell (3) includes an outer cavity (306), with an inlet (301) fixedly connected to the bottom of the outer cavity (306). The inlet (301) is fixedly connected to and communicates with the conical pressure regulating cavity (302). A partition (303) is fixedly connected to the upper surface of the conical pressure regulating cavity (302), and an inner cavity (304) is fixedly connected to the upper surface of the partition (303). The conical pressure regulating cavity (302) and the inner cavity (304) are both located inside the outer cavity (306). The left and right sides of the lower side of the outer cavity (306) are respectively fixedly connected to a first liquid outlet (308) and a second liquid outlet (309). The water inlet chamber (201) is inverted cone-shaped and has a water inlet grille at the top; The water inlet chamber (201) and the conical pressure regulating chamber (302) have the same conical slope angle; A spring (1) is sleeved on the outside of the water flow chamber (202), and the two ends of the spring (1) are fixedly connected to the lower surface of the cylindrical vertical surface (20304) and the upper surface of the partition (303), respectively.

2. The three-way capillary constant pressure regulating valve for drip irrigation according to claim 1, characterized in that, The radius of the frustum-shaped pressure regulating surface (20303) is the same as the radius of the outer cylindrical vertical surface (20304).

3. The three-way capillary constant pressure regulating valve for drip irrigation according to claim 1, characterized in that, The outer surface of the outer cylindrical vertical surface (20304) is provided with a second sealing ring limiting groove (20301), and a second sealing ring (5) is provided in the second sealing ring limiting groove (20301). The outer surface of the second sealing ring (5) is in contact with the inner wall of the lower shell (3).

4. A three-way capillary constant pressure regulating valve for drip irrigation according to claim 1, characterized in that, The inner wall of the inner cavity (304) is provided with an exhaust hole (305). The exhaust hole (305) extends through to the outer surface of the outer cavity (306) and communicates with the outside. There are multiple exhaust holes (305), which are symmetrically distributed in the inner cavity (304). The vertical position of the exhaust hole (305) is located between the upper cavity (203) and the partition (303).

5. A three-way capillary constant pressure regulating valve for drip irrigation according to claim 1, characterized in that, The partition (303) is annular, and a first sealing ring limiting groove (30301) is provided on the inner wall of the partition (303). A first sealing ring (4) is provided in the first sealing ring limiting groove (30301), and the first sealing ring (4) is sleeved on the outside of the water flow chamber (202).

6. A three-way capillary constant pressure regulating valve for drip irrigation according to claim 1, characterized in that, The upper housing (6) has an internal thread (601) inside, and the lower housing (3) has an external thread (307) on its outer surface. The upper housing (6) is threaded to the outer surface of the lower housing (3) through the external thread (307) and the internal thread (601).

7. The application of a three-way capillary constant pressure regulating valve for drip irrigation according to any one of claims 1-6, characterized in that, Specifically, the following steps are included: S1. Install the three-way capillary constant pressure regulating valve on the branch pipe of the drip irrigation system. The water flows through the inlet (301) into the conical pressure regulating chamber (302), through the inlet chamber (201) of the pressure regulating cone (2), and along the flow chamber (202) from the outlet (20302) into the outer chamber (306). Finally, it enters the capillary tube along the first liquid outlet (308) and the second liquid outlet (309) at the bottom of the outer chamber (306). S2, Balance stage: Before the drip irrigation system starts to pressurize, the supporting force of the spring (1) on the pressure regulating cone (2) is balanced with its own weight, and the cross-sectional area of ​​the inlet (301) remains unchanged. During this process, the top surface of the inlet cavity (201) will not contact the bottom surface of the partition (303). S3, Pressurization stage: When the drip irrigation system starts pressurization, the pressure in the conical pressure regulating chamber increases, and at the same time, the pressure at the outlet (20302) of the upper cavity (203) also gradually increases; S4, Critical Stage: When the pressure at the outlet (20302) increases to a certain value, the frustum-shaped pressure regulating surface (20303) on the upper part of the pressure regulating cone (2) is pushed by the water pressure, causing the pressure regulating cone (2) to start moving as a whole in the direction of water inlet; S5, Pressure regulation stage: At this time, the spring (1) begins to compress, the water inlet chamber (201) gradually approaches the conical pressure regulating chamber (302), the space between the water inlet chamber (201) and the water inlet (301) decreases, the head loss increases, and the pressure is reduced; S6, Pressure Stabilization Stage: At this time, the water pressure in the conical pressure regulating chamber (302) decreases, and the pressure at the outlet (20302) of the pressure regulating cone (2) also decreases, thus achieving the effect of pressure stabilization.

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