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Abstract

The utility model provides a kind of liquid inlet pipe manifold, comprising: main pipeline, main pipeline is integrally cast into shape, main pipeline includes flange connecting portion and hollow straight pipe extending along the extension direction of flange connecting portion, flange connecting portion and at least part of the outer edge of hollow straight pipe are adapted and are attached on at least part of the outer edge of hollow straight pipe;Hollow straight pipe has mutually connected liquid inlet passage and liquid outlet passage, liquid inlet passage is provided with liquid inlet at the end away from liquid outlet passage;Along the extension direction of liquid inlet passage to liquid outlet passage, the diameter of at least part of liquid outlet passage gradually decreases;Along the extension direction of liquid inlet passage to liquid outlet passage, multiple interval set communication port is provided on liquid outlet passage;Multiple communication channels are provided on flange connecting portion.The technical scheme provided by the utility model can solve the technical problem of low structural strength of the liquid inlet pipe manifold formed by connecting multiple components in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of fracturing equipment technology, and more specifically, to an upper fluid manifold. Background Technology

[0002] Currently, the fluid supply manifold, as a crucial piece of equipment in fracturing operations, determines the suction performance of the fracturing pump, thus affecting its service life. Existing fluid supply manifolds are formed by welding several standard pipe fittings and a base together or connecting them using connectors.

[0003] However, such a structure often results in low structural strength of the upper fluid manifold, making it unable to withstand harsh working environments and heavy workloads. The upper fluid manifold is prone to damage and may cause hydraulic end failure. Utility Model Content

[0004] The main objective of this invention is to provide an upper liquid manifold to solve the technical problem of low structural strength in existing upper liquid manifolds formed by connecting multiple components.

[0005] To achieve the above objectives, this utility model provides an upper liquid manifold, comprising:

[0006] The main pipeline is integrally cast and includes interconnected flange connections and hollow straight pipes extending along the extension direction of the flange connections.

[0007] Furthermore, the flange connection is adapted to at least a portion of the outer edge of the hollow straight pipe and is attached to at least a portion of the outer edge of the hollow straight pipe.

[0008] Furthermore, the hollow straight tube has an inlet channel and an outlet channel connected to each other, and an inlet is provided at the end of the inlet channel away from the outlet channel; along the extension direction from the inlet channel to the outlet channel, the diameter of at least a portion of the outlet channel gradually decreases;

[0009] Furthermore, along the extension direction from the inlet channel to the outlet channel, the outlet channel is provided with multiple spaced-apart connecting ports; the flange connection is provided with multiple connecting channels, each connecting channel and each connecting port is provided in a one-to-one correspondence, and each connecting channel is connected to the corresponding connecting port and is set at a preset angle to the outlet channel.

[0010] Furthermore, the flange connection includes a first connection, at least one intermediate connection, and a second connection connected sequentially along the extension direction of the flange connection. The first connection and the intermediate connection adjacent to the first connection form a communication port, and the second connection and the intermediate connection adjacent to the second connection form a communication port. Two adjacent communication ports are separated by a second connection.

[0011] Furthermore, there are at least two intermediate connecting parts, and two adjacent intermediate connecting parts form a connecting port.

[0012] Furthermore, a weight-reducing groove is provided on the intermediate connecting part; and / or,

[0013] The extension direction of the connecting channel is perpendicular to the extension direction of the flange connection.

[0014] Furthermore, the first connecting part includes a first connecting section and a first flange plate connected along the extension direction of the connecting channel. The first connecting section extends along the extension direction of the connecting channel and is connected to the hollow straight pipe. The first flange plate is located at the end of the first connecting section away from the hollow straight pipe and protrudes out of the outer side of the first connecting section. The main pipeline also includes a first reinforcing member, which is disposed between the first flange plate and the first connecting section. The side of the first flange plate near the first connecting section and the outer wall of the first connecting section are both connected to the first reinforcing member.

[0015] Furthermore, the first reinforcing member is a reinforcing plate; and / or,

[0016] The side of the first flange plate closest to the first connecting section and the side of the first flange plate furthest from the first connecting section are set at a first predetermined angle A, 1°≤α≤2°; and / or,

[0017] The edge of the first reinforcing member on the side away from the first connecting section extends at a third predetermined angle α with the extension direction of the first flange plate, where 30°≤α≤60°.

[0018] Furthermore, the intermediate connection includes an intermediate connecting section and an intermediate flange plate connected along the extension direction of the connecting channel. The intermediate connecting section extends along the extension direction of the connecting channel and is connected to the hollow straight pipe. The intermediate flange plate is located at the end of the intermediate connecting section away from the hollow straight pipe and protrudes out of the outer side of the intermediate connecting section. The main pipeline also includes an intermediate reinforcing member, which is disposed between the intermediate flange plate and the intermediate connecting section. The side of the intermediate flange plate closest to the intermediate connecting section and the outer wall of the intermediate connecting section are both connected to the intermediate reinforcing member.

[0019] Furthermore, the second connection includes a second connecting section and a second flange plate connected along the extension direction of the connecting channel. The second connecting section extends along the extension direction of the connecting channel and is connected to the hollow straight pipe. The second flange plate is located at the end of the second connecting section away from the hollow straight pipe and protrudes outward from the outer side of the second connecting section. The main pipeline also includes a second reinforcing member, which is disposed between the second flange plate and the second connecting section. The side of the second flange plate closest to the second connecting section and the outer wall of the second connecting section are both connected to the second reinforcing member.

[0020] Furthermore, the second connection includes a lifting lug that is connected to both the second connecting section and the second flange plate, the lifting lug being formed in the area between the second connecting section and the second flange plate; and / or,

[0021] The second connecting section is an arc-shaped connecting section with a flushing port. The axis of the flushing port coincides with the normal of the arc-shaped connecting section at the flushing port.

[0022] Furthermore, the liquid outlet channel includes a first connecting channel and a second connecting channel connected in sequence. The first connecting channel is located on the side of the second connecting channel closer to the liquid inlet channel. The connection between the first connecting channel and the second connecting channel is opposite to the portion between two connecting ports located at the end away from the liquid inlet among a plurality of connecting ports. The first connecting channel forms at least a portion of the liquid outlet channel, and the second connecting channel is a channel of equal diameter.

[0023] Furthermore, the hollow straight tube has a uniform wall thickness structure; or,

[0024] Along the extension direction from the first connecting channel to the second connecting channel, the wall thickness of the hollow straight pipe segment forming the second connecting channel gradually increases.

[0025] Furthermore, the inlet channel is a channel of equal diameter; and / or,

[0026] The connection between the liquid inlet channel and the first connecting channel is smoothly transitioned; and / or,

[0027] The connection between the first and second connecting channels is smoothly transitioned.

[0028] Furthermore, the centers of the circles corresponding to the cross-sections of the first connecting channel are all located on the same plane; and / or,

[0029] A flushing port is provided at the end of the outlet channel away from the inlet channel. The upper manifold also includes a detection element, which is located at the flushing port and is sealed. The detection element is a flow sensor or a pressure sensor; and / or,

[0030] The hollow straight pipe is provided with an installation interface, which is located on the side of the hollow straight pipe away from the flange connection. The installation interface has an installation channel, which is connected to the first connecting channel. The tangent at the connection between the installation channel and the first connecting channel is set at a second predetermined angle with the extension direction of the installation channel.

[0031] Furthermore, a flushing port is formed at the end of the second connecting channel that is away from the first connecting channel;

[0032] Wherein, the diameter of the flushing port is equal to the diameter of the second connecting channel; and / or,

[0033] The axis of the flushing port extends horizontally; and / or,

[0034] The periphery of the flushing port is tangent to the inner wall of the second connecting channel.

[0035] Furthermore, the upper liquid manifold also includes:

[0036] A sealing plug is detachably installed at the flushing port to block or avoid the flushing port.

[0037] Furthermore, the upper fluid manifold also includes a snap-fit ​​element, which is movably disposed at the flushing port. The snap-fit ​​element has a snap-fit ​​position for snapping onto the sealing plug or a clearance position for avoiding the sealing plug; and / or,

[0038] The sealing plug is provided with a positioning step surface for abutting and positioning with the end of the flushing port; and / or,

[0039] The sealing plug is filled in the liquid outlet channel at the location between the flushing port and the one of the multiple connecting ports closest to the flushing port. The end of the sealing plug located in the liquid outlet channel has an inclined sealing surface.

[0040] Furthermore, the liquid outlet channel is provided with multiple side branch ports spaced apart along the extension direction of the liquid outlet channel, and each of the multiple side branch ports is spaced apart from multiple connecting ports.

[0041] The axis of the side branch pipe is set at a fourth predetermined angle β with the plate surface of the flange connection on the side away from the hollow straight pipe, where 10°≤β≤30°; and / or,

[0042] The upper liquid manifold also includes an installation protrusion, a connector, and interconnected union components and sealing components. The installation protrusion is located on the outer side wall of the main pipe and protrudes from the outer side wall of the main pipe. At least part of the union component is located at the side branch pipe opening. One end of the connector is connected to the sealing component, and the other end of the connector is provided with an installation hole that matches the installation protrusion. The other end of the connector is fitted onto the installation protrusion through the installation hole.

[0043] Furthermore, the liquid outlet channel is provided with a side branch pipe opening spaced apart from the connecting port; the liquid inlet manifold also includes a side branch pipe, which is connected to the hollow straight pipe, and the inner cavity of the side branch pipe is connected to the side branch pipe opening.

[0044] Wherein, the axis of the inner cavity of the side branch pipe coincides with the axis of the side branch pipe opening; and / or,

[0045] One outer edge of the side branch pipe is connected to the flange connection, and the other outer edge of the side branch pipe is set at a fifth predetermined angle γ with the horizontal plane, where 1°≤γ≤2°; and / or,

[0046] The side branch pipe is provided with a first connection structure at the end away from the hollow straight pipe. The first connection structure includes at least one of a snap-fit ​​structure, a thread, and a connection groove.

[0047] Furthermore, the inner wall of the liquid inlet channel and / or the inner wall of the liquid outlet channel is provided with an anti-corrosion and wear-resistant layer, which is made of at least one of epoxy resin and polyester resin.

[0048] Furthermore, the main pipeline is an eccentric reducer, and the main pipeline has a constant wall thickness structure or a variable wall thickness structure; and / or,

[0049] A second connection structure is provided at the liquid inlet, which includes at least one of a snap-fit ​​structure, a thread, and a connecting groove.

[0050] By applying the technical solution of this utility model, the overall structural strength of the structure can be guaranteed by integrally casting the main pipeline. Furthermore, by ensuring that at least a portion of the flange connection is adapted to and attached to the outer edge of the hollow straight pipe, the contact area between the flange connection and the hollow straight pipe can be effectively guaranteed, thereby facilitating a more effective connection between the flange connection and the hollow straight pipe, and ultimately ensuring a better overall structural strength. Attached Figure Description

[0051] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0052] Figure 1 A schematic diagram of the upper liquid manifold provided according to Embodiment 1 of the present invention is shown;

[0053] Figure 2 A cross-sectional view of the upper liquid manifold provided according to Embodiment 1 of the present invention is shown;

[0054] Figure 3 A cross-sectional view of the intermediate connecting portion provided according to Embodiment 1 of the present invention is shown;

[0055] Figure 4 A front view of the upper liquid manifold provided according to Embodiment 1 of the present invention is shown;

[0056] Figure 5 A schematic diagram of the structure of an upper liquid manifold with lifting lugs according to Embodiment 1 of the present invention is shown;

[0057] Figure 6 A schematic diagram of the structure provided in Embodiment 1 of the present invention shows that the axis of the flushing port coincides with the normal of the arc-shaped connecting section at the flushing port;

[0058] Figure 7 A schematic diagram of the upper liquid manifold provided according to Embodiment 2 of the present invention is shown;

[0059] Figure 8 A front view of the upper liquid manifold provided according to Embodiment 2 of the present invention is shown;

[0060] Figure 9 A top view of the upper liquid manifold provided according to Embodiment 2 of the present invention is shown;

[0061] Figure 10 A bottom view of the upper liquid manifold provided according to Embodiment 2 of the present invention is shown;

[0062] Figure 11 A side view of the upper liquid manifold provided according to Embodiment 2 of the present invention is shown;

[0063] Figure 12 Another side view of the upper liquid manifold provided according to Embodiment 2 of the present invention is shown;

[0064] Figure 13 An isometric view of the upper liquid manifold provided according to Embodiment 2 of the present invention is shown;

[0065] Figure 14 A cross-sectional view of the upper fluid manifold provided according to Embodiment 2 of the present invention is shown from one perspective;

[0066] Figure 15 A cross-sectional view of the upper fluid manifold provided according to Embodiment 2 of the present invention is shown from another perspective.

[0067] The above figures include the following reference numerals:

[0068] 10. Main pipeline;

[0069] 11. Flange connection;

[0070] 111. First connecting part; 1111. First connecting section; 1112. First flange plate; 1113. First reinforcing member;

[0071] 112. Intermediate connecting part; 1121. Weight reduction groove; 1122. Intermediate connecting section; 1123. Intermediate flange plate; 1124. Intermediate reinforcing member;

[0072] 113. Second connecting part; 1131. Second connecting section; 1132. Second flange plate; 1133. Second reinforcing member;

[0073] 12. Hollow straight pipe; 121. Liquid inlet channel; 122. Liquid outlet channel; 1221. Connecting port; 1222. First connecting channel; 1223. Second connecting channel; 1224. Flushing port; 123. Installation interface; 124. Side branch port;

[0074] 13. Lifting lug; 14. Sealing groove; 15. Bolt hole;

[0075] 20. Inspection piece; 30. Installation protrusion; 40. Union assembly; 50. Sealing piece; 60. Connecting piece; 70. Connecting bolt; 80. Sealing piece; 90. Sealing plug; 100. Snap-fit ​​piece; 110. Side branch pipe. Detailed Implementation

[0076] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0077] like Figures 1 to 4 As shown, Embodiment 1 of this utility model provides an upper liquid manifold, which includes: a main pipe 10, which is integrally cast, and the main pipe 10 includes a flange connection 11 connected to each other and a hollow straight pipe 12 extending along the extension direction of the flange connection 11.

[0078] By using the liquid inlet manifold provided in this embodiment, the overall structural strength of the structure can be guaranteed by integrally casting the main pipe 10.

[0079] Specifically, the main pipe 10 can be integrally formed by casting from cast iron or cast steel, which can increase the rigidity of the connection area and help improve fatigue life. The casting process replaces the original welding and threaded connection, which on the one hand can avoid leakage problems at the connection and improve product reliability; on the other hand, casting can easily achieve complex curved surface forming, which can make the transition of the inner wall cavity smoother and help stabilize the flow field inside the pipe.

[0080] The flange connection 11 is adapted to at least a portion of the outer edge of the hollow straight pipe 12 and is attached to at least a portion of the outer edge of the hollow straight pipe 12. The hollow straight pipe 12 has an inlet channel 121 and an outlet channel 122 connected to each other. An inlet port is provided at the end of the inlet channel 121 away from the outlet channel 122. Along the extension direction from the inlet channel 121 to the outlet channel 122, the diameter of at least a portion of the outlet channel 122 gradually decreases.

[0081] Along the extension direction from the inlet channel 121 to the outlet channel 122, the outlet channel 122 is provided with a plurality of spaced-apart connecting ports 1221; the flange connection part 11 is provided with a plurality of connecting channels, and the plurality of connecting channels are provided in a one-to-one correspondence with the plurality of connecting ports 1221. Each connecting channel is connected to the corresponding connecting port 1221 and is set at a preset angle to the outlet channel 122.

[0082] By adapting the flange connection 11 to at least a portion of the outer edge of the hollow straight pipe 12 and attaching it to at least a portion of the outer edge of the hollow straight pipe 12, the contact area between the flange connection 11 and the hollow straight pipe 12 can be effectively guaranteed, thereby facilitating a more effective guarantee of the connection strength between the flange connection 11 and the hollow straight pipe 12, and thus better guaranteeing the connection strength of the structure.

[0083] Furthermore, since the diameter of at least a portion of the outlet channel 122 gradually decreases along the extension direction from the inlet channel 121 to the outlet channel 122, this facilitates ensuring that the flow velocity at the connecting ports 1221 located far from the inlet channel 121 remains at a certain level. This prevents the flow velocity at the connecting ports 1221 from decreasing due to excessive distance from the inlet channel 121, thereby ensuring that the flow velocity at each connecting port 1221 meets the requirements as much as possible.

[0084] In this embodiment, the connection between the flange connection 11 and the main pipe 10 can be understood as a solid connection, which increases the contact area between the flange connection 11 and the hollow straight pipe 12.

[0085] In this embodiment, the flange connection 11 includes a first connection 111, at least one intermediate connection 112, and a second connection 113 connected sequentially along the extension direction of the flange connection 11. The first connection 111 and the intermediate connection 112 adjacent to the first connection 111 form a communication port 1221, and the second connection 113 and the intermediate connection 112 adjacent to the second connection 113 form a communication port 1221. Two adjacent communication ports 1221 are separated by a second connection 113. This structural arrangement can effectively ensure the connection stability and reliability between the flange connection 11 and the hollow straight pipe 12, thereby better ensuring the overall structural strength of the upper liquid manifold.

[0086] Specifically, there are at least two intermediate connecting parts 112, and two adjacent intermediate connecting parts 112 form a communication port 1221. This is to better ensure the connection stability between the flange connecting part 11 and the hollow straight pipe 12, and effectively ensure the overall strength of the structure.

[0087] In this embodiment, a weight-reducing groove 1121 is provided on the intermediate connecting part 112 to reduce the overall weight of the upper liquid manifold. In addition, the design of the weight-reducing groove 1121 makes the casting wall more uniform, with less thickness variation, and less prone to casting defects.

[0088] Specifically, the extension direction of the connecting channel is perpendicular to the extension direction of the flange connection 11, so as to reduce the overall length of the upper liquid manifold.

[0089] In this embodiment, the first connecting portion 111 includes a first connecting section 1111 and a first flange plate 1112 connected along the extension direction of the connecting channel. The first connecting section 1111 extends along the extension direction of the connecting channel and is connected to the hollow straight pipe 12. The first flange plate 1112 is located at the end of the first connecting section 1111 away from the hollow straight pipe 12, and the first flange plate 1112 protrudes outward from the outside of the first connecting section 1111. The main pipe 10 also includes a first reinforcing member 1113, which is disposed between the first flange plate 1112 and the first connecting section 1111. The side of the first flange plate 1112 closest to the first connecting section 1111 and the outer wall of the first connecting section 1111 are both connected to the first reinforcing member 1113. This structural arrangement facilitates further improvement in the structural stability of the first flange plate 1112, thereby improving the stability and strength of the structure.

[0090] Specifically, the first reinforcing member 1113 is a reinforcing plate, which effectively strengthens the structure.

[0091] In this embodiment, the side of the first flange plate 1112 closest to the first connecting section 1111 is set at a first predetermined angle A with the side of the first flange plate 1112 furthest from the first connecting section 1111. This arrangement facilitates demolding during casting and improves connection rigidity. Specifically, the first predetermined angle A can be between 1° and 2°.

[0092] Specifically, the intermediate connecting part 112 includes an intermediate connecting section 1122 and an intermediate flange plate 1123 connected along the extension direction of the connecting channel. The intermediate connecting section 1122 extends along the extension direction of the connecting channel and connects to the hollow straight pipe 12. The intermediate flange plate 1123 is located at the end of the intermediate connecting section 1122 away from the hollow straight pipe 12, and the intermediate flange plate 1123 protrudes outward from the outer side of the intermediate connecting section 1122. The main pipe 10 also includes an intermediate reinforcing member 1124, which is disposed between the intermediate flange plate 1123 and the intermediate connecting section 1122. The side of the intermediate flange plate 1123 closest to the intermediate connecting section 1122 and the outer wall of the intermediate connecting section 1122 are both connected to the intermediate reinforcing member 1124. In this way, the connection stability of the intermediate flange plate 1123 can be effectively guaranteed, thereby ensuring the structural strength of the intermediate flange plate 1123.

[0093] Specifically, the second connecting portion 113 includes a second connecting section 1131 and a second flange plate 1132 connected along the extension direction of the connecting channel. The second connecting section 1131 extends along the extension direction of the connecting channel and connects to the hollow straight pipe 12. The second flange plate 1132 is located at the end of the second connecting section 1131 away from the hollow straight pipe 12, and the second flange plate 1132 protrudes outward from the outer side of the second connecting section 1131. The main pipe 10 also includes a second reinforcing member 1133, which is disposed between the second flange plate 1132 and the second connecting section 1131. The side of the second flange plate 1132 closest to the second connecting section 1131 and the outer wall of the second connecting section 1131 are both connected to the second reinforcing member 1133. This facilitates the effective guarantee of the connection stability of the second flange plate 1132, thereby ensuring the structural strength of the second flange plate 1132.

[0094] In this embodiment, the liquid outlet channel 122 includes a first connecting channel 1222 and a second connecting channel 1223 connected in sequence. The first connecting channel 1222 is located on the side of the second connecting channel 1223 near the liquid inlet channel 121. The connection between the first connecting channel 1222 and the second connecting channel 1223 is positioned opposite to the portion between two connecting ports 1221 located away from the liquid inlet end among the plurality of connecting ports 1221. The first connecting channel 1222 forms at least a portion of the liquid outlet channel 122, and the second connecting channel 1223 is a channel of equal diameter. With this structural arrangement, it is easy for the fluid to form a stable flow velocity in the first connecting channel 1222 and flow out at a stable flow velocity.

[0095] Specifically, the liquid inlet channel 121 is a channel of equal diameter.

[0096] Specifically, the connection between the liquid inlet channel 121 and the first connecting channel 1222 is smoothly transitioned to ensure smooth fluid flow, avoid excessive fluid resistance, and prevent affecting the fluid flow.

[0097] Specifically, the connection between the first connecting channel 1222 and the second connecting channel 1223 is smoothly transitioned to ensure smooth fluid flow and avoid excessive fluid resistance.

[0098] In this embodiment, the centers of the circles corresponding to the flow cross sections of the first connecting channel 1222 are all located on the same plane, so as to optimize the flow direction of the fluid in the first connecting channel 1222 and facilitate guiding the fluid in the first connecting channel 1222 to a predetermined direction and position.

[0099] Specifically, a flushing port 1224 is provided at the end of the liquid outlet channel 122 away from the liquid inlet channel 121. The liquid supply manifold also includes a detection element 20, which is located at the flushing port 1224 and blocks the flushing port 1224. The detection element 20 is a flow sensor or a pressure sensor. This structural arrangement facilitates the detection of flow rate and pressure within the liquid outlet channel 122.

[0100] Specifically, the hollow straight pipe 12 is provided with an installation interface 123, which is located on the side of the hollow straight pipe 12 away from the flange connection 11. The installation interface 123 has an installation channel that communicates with the first connecting channel 1222. The tangent at the connection between the installation channel and the first connecting channel 1222 is set at a second predetermined angle to the extension direction of the installation channel. Specifically, a sensor can also be installed in the installation channel to detect the fluid conditions at the first connecting channel 1222. The installation interface is arranged below the manifold, and its installation orientation forms an acute angle with the fluid direction of the main pipe 10 to reduce the erosion of the sensor by sand and gravel.

[0101] Specifically, the liquid outlet channel 122 is provided with multiple spaced side branch ports 124. The liquid inlet manifold also includes: a mounting protrusion 30, interconnected union components 40 and sealing elements 50, and a connector 60. The mounting protrusion 30 is located on the outer side wall of the main pipe 10 and protrudes from the outer side wall of the main pipe 10. At least a portion of the union component 40 is located at the side branch port 124. One end of the connector 60 is connected to the sealing element 50, and the other end of the connector 60 is provided with a mounting hole adapted to the mounting protrusion 30. The other end of the connector 60 is fitted onto the mounting protrusion 30 through the mounting hole. This facilitates the removal of the sealing element 50 by hanging the disassembled union component 40 on the mounting protrusion 30 via the connector 60, thus preventing loss. In addition, during on-site operations, the union component 40 will not be placed on the bottom surface, avoiding the problem of mud and sand entering the threads of the union component 40.

[0102] Specifically, the included angle between the side branch port 124 and the flange connection 11 is 10° to 30°.

[0103] Specifically, connector 60 can be a chain. Mounting protrusion 30 can be a screw.

[0104] The specific ground liquid manifold also includes connecting bolts 70 and seals 80. The connecting bolts 70 are set on the flange connection part 11, and the seals 80 are set around the communication port 1221.

[0105] In this embodiment, an anti-corrosion and wear-resistant layer is provided on the inner wall of the liquid inlet channel 121 and / or the inner wall of the liquid outlet channel 122. The anti-corrosion and wear-resistant layer is made of at least one of epoxy resin and polyester resin. This anti-corrosion and wear-resistant layer has excellent corrosion resistance and is suitable for working environments with acid, alkali, and salt as media. Furthermore, the coating has excellent adhesion to the metal substrate, good hardness and wear resistance, which can protect the inner wall of the pipeline and improve the service life of the product.

[0106] Specifically, such as Figure 5 As shown, in one embodiment, the second connecting portion 113 includes a lifting lug 13 connected to both the second connecting section 1131 and the second flange plate 1132. The lifting lug 13 is formed in the area between the second connecting section 1131 and the second flange plate 1132. This arrangement facilitates and improves the convenience and stability of lifting the upper liquid manifold. Because the upper liquid manifold is thin and long, it often requires lifting during installation and relocation. The lifting lug 13 formed at the tail of the upper liquid manifold improves the convenience and stability of installation and relocation.

[0107] Specifically, such as Figure 6 As shown, in one embodiment, the second connecting segment 1131 is an arc-shaped connecting segment with a flushing port 1224. The axis of the flushing port 1224 coincides with the normal of the arc-shaped connecting segment at the flushing port 1224. This ensures that the flushing port 1224 corresponds to a smaller hole depth, minimizing its impact on the flow field and thus reducing sand accumulation in that area. Specifically, an air pipe or sensor can be connected to the flushing port 1224.

[0108] The hollow tube consists of a horizontal, equal-diameter section (corresponding to inlet channel 121), a tapering section (corresponding to the first connecting channel 1222), and a bent, equal-diameter section (corresponding to the second connecting channel 1223). These three sections have a smooth transition and uniform wall thickness. The horizontal, equal-diameter section is the tangential section from the inlet to the first outlet near the inlet. The tapering section extends from the first outlet section to the section between the fourth and fifth outlets, with its inner diameter gradually decreasing and its center changing along an eccentric curve. The bent, hollow tube section extends horizontally from the section between the fourth and fifth outlets, bending towards the flange near the fifth outlet and connecting to it. Simulation results show that the inlet flow velocity is sufficient and stable, requiring no diameter change. Without affecting the liquid intake at the nearest connecting port 1221 (also known as the outlet), the horizontal orientation is advantageous for installation and processing. As the number of outlets increases, the liquid suction capacity of the terminal connector 1221 gradually weakens compared to the front end. Therefore, it is necessary to rely on changes in the inner diameter of the pipe cross-section to increase the fluid velocity and avoid cavitation. Thus, the middle tapering section extends from the cross-section of the first connector 1221 to the cross-section between the fourth and fifth connectors 1221, gradually changing according to calculations to ensure the instantaneous velocity of each connector 1221. The flow velocity at the fifth connector 1221 is controlled by the diameter of the tail bend. The tail of the middle tapering section eventually becomes horizontal, facilitating contact between the inner wall of the tail bend equal-diameter section and the horizontal plane, thereby shortening the tail bend equal-diameter section and effectively reducing vortex flow at this point. Any circular cross-section of the tapering section is tangent to a horizontal plane, and the centers of all circular cross-sections lie in the same plane. The starting point of the tapering section is tangent to the front horizontal pipe, and the ending point is tangent to the rear bend.

[0109] The outer diameters of the five connecting ports 1221 can be the same or different. When the outer diameters are different, the outer diameter of the discharge pipe connected to the connecting port 1221 closest to the inlet should be larger than the outer diameter of the discharge pipe furthest from the inlet. The main pipe 10 closest to the inlet has a larger diameter and greater mass, and its vertical pipe connection end is subjected to greater force. Therefore, while ensuring that the inner diameter is consistent, its wall thickness should be increased, that is, the outer diameter should be larger. This is beneficial to the reliability of the manifold structure.

[0110] The presence of the side branch and tail end of the upper liquid manifold affects the fluid flow field, causing swirling flow and severe sand accumulation in the area. A step is installed at the side branch of the manifold, fitted with a union-type fixed plug, which can be made of plastic or metal. A blind plug is added to the tail end for use as a normally closed plug when no sensor installation is required. This design helps reduce swirling flow and can reduce sand accumulation in this area to some extent.

[0111] like Figures 7 to 15As shown, Embodiment 2 of this utility model provides a liquid inlet manifold. The main difference between the liquid inlet manifold in this embodiment and the liquid inlet manifold in Embodiment 1 is the location and arrangement of the flushing port 1224.

[0112] In this embodiment, a flushing port 1224 is formed at the end of the second connecting channel 1223 that is away from the first connecting channel 1222. By providing a flushing port 1224 on the opposite side of the liquid inlet, flushing and sand removal can be easily performed through the flushing port 1224, thereby improving the flushing effect.

[0113] Specifically, the diameter of the flushing port 1224 is equal to the diameter of the second connecting channel 1223 to ensure effective sand removal. When sand removal is required, the internal condition of the pipe can be directly observed through the flushing port 1224, and the large diameter of the flushing port 1224 also facilitates the insertion of tools for sand removal. This configuration is more convenient for disassembly and assembly compared to sand removal through the liquid inlet. The configuration of the flushing port 1224, combined with the gradually decreasing inner diameter of the hollow straight pipe 12, also avoids the throttling phenomenon at the lower valve caused by an excessively small diameter of the flushing port 1224, thereby enhancing the sand-carrying capacity of the fluid and reducing the risk of cavitation.

[0114] Specifically, the axis of the flushing port 1224 extends horizontally. This allows the flushing port 1224 to be positioned as low as possible, facilitating sand removal operations.

[0115] Specifically, the periphery of the flushing port 1224 is tangent to the inner wall of the second connecting channel 1223, which allows for a smooth transition within the hollow straight pipe 12, enabling adjustment of the fluid flow rate and ensuring smooth fluid flow. Furthermore, the tangential arrangement avoids the formation of steps, preventing accelerated erosion and manifold failure, and reducing dead zones for sand removal.

[0116] Specifically, the main pipe 10 has a smooth, continuous curve in its appearance. Near the end of the main pipe 10, it is a constant-diameter pipe tangent to the smooth curve, and the diameter of the flushing port 1224 is the same as the diameter of the constant-diameter pipe at the end of the pipe. The purpose of this design is that the gradually decreasing diameter of the main pipe and the smooth transition of the inner cavity allow for adjustment of the fluid velocity, ensuring smooth fluid flow. The fact that the diameter of the flushing port 1224 is the same as the diameter of the constant-diameter pipe at the end of the pipe avoids throttling at the lower valve caused by an excessively small diameter flushing port 1224, thereby enhancing the fluid's sand-carrying capacity and reducing the risk of cavitation.

[0117] In this embodiment, the upper liquid manifold also includes a sealing plug 90, which is detachably disposed at the flushing port 1224 to block or avoid the flushing port 1224. This structural arrangement allows for easy avoidance of the flushing port 1224 when sand removal is required, and easy blocking of the flushing port 1224 when sand removal is not needed, simplifying operation.

[0118] Specifically, the upper liquid manifold also includes a snap-fit ​​component 100, which is movably disposed at the flushing port 1224. The snap-fit ​​component 100 has a snap-fit ​​position for snapping onto the sealing plug 90 or a clearance position for avoiding the sealing plug. This facilitates snapping onto or clearing the sealing plug 90 using the snap-fit ​​component 100, thereby further improving the ease of operation.

[0119] Specifically, the sealing plug 90 is provided with a positioning step surface for abutting and positioning with the end of the flushing port 1224. This facilitates the positioning of the sealing plug 90 and ensures the correct installation direction of the sealing plug 90, avoiding unstable sealing positions and improving the sealing stability of the sealing plug 90.

[0120] In this embodiment, the sealing plug 90 fills the portion of the liquid outlet channel 122 located between the flushing port 1224 and the one closest to the flushing port 1224 among the multiple connecting ports 1221. One end of the sealing plug 90 within the liquid outlet channel 122 has an inclined sealing surface. This structural arrangement facilitates filling the portion of the liquid outlet channel 122 located between the flushing port 1224 and the one closest to the flushing port 1224 among the multiple connecting ports 1221, reducing liquid inflow into this portion. The inclined sealing surface also helps to mitigate the impact of the liquid on the fluid within the liquid outlet channel 122, allowing the liquid to flow smoothly along the inclined sealing surface to the connecting port 1221 closest to the flushing port 1224.

[0121] In the two embodiments described above, the liquid outlet channel 122 is provided with a plurality of side branch ports 124 spaced apart along the extension direction of the liquid outlet channel 122, and the plurality of side branch ports 124 are spaced apart from the plurality of connecting ports 1221.

[0122] Preferably, multiple side branch ports 124 are provided in a one-to-one correspondence with multiple connecting ports 1221, and each side branch port 124 and the corresponding connecting port 1221 are arranged at intervals along the circumference of the liquid outlet channel 122.

[0123] Specifically, the axis of the side branch port 124 is set at a fourth predetermined angle β with the plate surface of the flange connection 11 on the side away from the hollow straight pipe 12, where 10°≤β≤30°. This ensures that there is a sufficient distance between the side branch port 124 and the connecting port 1221 located on the plate surface, avoiding interference between the side branch port 124 and the connecting port 1221, while also providing sufficient operating space for both the side branch port 124 and the connecting port 1221.

[0124] In both embodiments described above, the liquid outlet channel 122 is provided with a side branch port 124 spaced apart from the connecting port 1221; the liquid inlet manifold also includes a side branch pipe 110, which is connected to the hollow straight pipe 12, and the inner cavity of the side branch pipe 110 is connected to the side branch port 124. This facilitates liquid outlet through the side branch pipe 110 via the side branch port 124, making liquid outlet easier. The side branch pipe also facilitates drainage from the top valve.

[0125] Specifically, the axis of the inner cavity of the side branch pipe 110 coincides with the axis of the side branch pipe opening 124. This facilitates the smooth discharge of liquid and reduces the impact on the liquid during the discharge process.

[0126] Specifically, the outer edge of one side of the side branch pipe 110 is connected to the flange connection 11, and the outer edge of the other side of the side branch pipe 110 is set at a fifth predetermined angle γ with the horizontal plane, where 1°≤γ≤2°. This facilitates demolding after casting.

[0127] Specifically, the end of the side branch pipe 110 furthest from the hollow straight pipe 12 is provided with a first connecting structure, which includes at least one of a snap-fit ​​structure, a thread, and a connecting groove. This facilitates the installation of a plug or connecting joint at the side branch pipe, making connection convenient, and also serves as a seal to prevent leakage during operation. When the fracturing pump is in a stopped state, the valve is lifted through the side branch pipe 110 or by the plug or connecting joint installed at the side branch pipe 110 using a tool to drain the participating fluid in the hydraulic end. Simultaneously, the hydraulic end can be observed through the side branch pipe 110.

[0128] Specifically, the aforementioned thread structure can employ tapered threads to better achieve a sealing effect and prevent leakage.

[0129] In the two embodiments described above, the main pipe 10 is an eccentric reducer, and the main pipe 10 has a constant wall thickness structure or a variable wall thickness structure.

[0130] In both embodiments described above, a second connecting structure is provided at the liquid inlet. This second connecting structure includes at least one of a snap-fit ​​structure, a thread, and a connecting groove. This structural arrangement facilitates connection to the liquid supply pipeline via the second connecting structure. Specifically, the second connecting structure facilitates connection to the clamp joint, threaded union joint, or welded joint of the liquid supply pipeline.

[0131] Specifically, the hollow straight tube 12 has a uniform wall thickness to facilitate manufacturing. Alternatively, along the extension direction from the first connecting channel 1222 to the second connecting channel 1223, the wall thickness of the section of the hollow straight tube 12 that surrounds the second connecting channel 1223 gradually increases to avoid the phenomenon of insufficient wall thickness at the tail end caused by erosion from sand-carrying liquid inside the tube.

[0132] Specifically, the edge of the first reinforcing member 1113 on the side furthest from the first connecting section 1111 extends at a third predetermined angle α with the extension direction of the first flange plate 1112, where 30°≤α≤60°. This facilitates demolding while ensuring the supporting strength of the first reinforcing member 1113. The second reinforcing member 1133 and the intermediate reinforcing member 1124 can also be configured in the same way.

[0133] In the two embodiments described above, the axis of the main pipe 10 is designed to form a certain angle with the flange plates (including the interconnected first flange plate 1112 and second flange plate 1132) to facilitate the outflow of liquid from the main pipe 10 after shutdown. The connection between the main pipe 10 and the flange plate is relatively short. This is to shorten the height between the connecting port 1221 and the main pipe 10, reduce resistance loss, and at the same time, utilize the water hammer effect to keep the gravel in motion during the period when the valve is closed, preventing it from settling to the bottom of the manifold and further improving the sand carrying capacity.

[0134] Specifically, when there are 5 connecting ports 1221, the lower valves of the cylinders corresponding to the 1st, 3rd, and 5th connecting ports are closed, while the lower valves of the cylinders at the 2nd and 4th connecting ports are open. At this time, the flow velocity in the pipeline can still meet the sand-carrying requirements. Although the lower valve of cylinder 1 is in a closed state, the water hammer effect generated by the closure of the lower valve still keeps the fluid in the pipe in a flowing state, which is conducive to hindering the settling of fracturing sand.

[0135] In the two embodiments described above, a sealing groove 14 for placing a sealing ring is provided around the periphery of the connecting port 1221, and a bolt hole 15 for connection is provided on the outer edge of the sealing groove 14.

[0136] As can be seen from the above description, the above embodiments of this utility model achieve the following technical effects: good structural strength and good stability.

[0137] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0138] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0139] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0140] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0141] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0142] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A liquid supply manifold, characterized in that, include: The main pipeline (10) includes interconnected flange connections (11) and hollow straight pipes (12) extending along the extension direction of the flange connections (11), and the main pipeline (10) is integrally cast.

2. The upper liquid manifold according to claim 1, characterized in that, The flange connection (11) is adapted to at least a portion of the outer edge of the hollow straight pipe (12) and is attached to at least a portion of the outer edge of the hollow straight pipe (12).

3. The upper liquid manifold according to claim 1, characterized in that, The hollow straight tube (12) has an inlet channel (121) and an outlet channel (122) connected to each other. An inlet is provided at the end of the inlet channel (121) away from the outlet channel (122). Along the extension direction from the inlet channel (121) to the outlet channel (122), the diameter of at least a portion of the outlet channel (122) gradually decreases.

4. The upper liquid manifold according to claim 3, characterized in that, Along the extension direction from the liquid inlet channel (121) to the liquid outlet channel (122), the liquid outlet channel (122) is provided with a plurality of spaced-apart connecting ports (1221); the flange connection part (11) is provided with a plurality of connecting channels, and the plurality of connecting channels are provided in a one-to-one correspondence with the plurality of connecting ports (1221). Each connecting channel is connected to the corresponding connecting port (1221) and is set at an angle to the liquid outlet channel (122).

5. The upper liquid manifold according to claim 4, characterized in that, The flange connection (11) includes a first connection (111), at least one intermediate connection (112), and a second connection (113) connected sequentially along the extension direction of the flange connection (11). The first connection (111) and the intermediate connection (112) adjacent to the first connection (111) form a communication port (1221). The second connection (113) and the intermediate connection (112) adjacent to the second connection (113) form a communication port (1221). Two adjacent communication ports (1221) are separated by a second connection (113).

6. The upper liquid manifold according to claim 5, characterized in that, The intermediate connecting parts (112) are at least two, and two adjacent intermediate connecting parts (112) form a communication port (1221); and / or, The intermediate connecting part (112) is provided with a weight-reducing groove (1121); and / or, The extension direction of the connecting channel is perpendicular to the extension direction of the flange connection (11).

7. The upper liquid manifold according to claim 5, characterized in that, The first connecting part (111) includes a first connecting section (1111) and a first flange plate (1112) connected along the extension direction of the connecting channel. The first connecting section (1111) extends along the extension direction of the connecting channel and is connected to the hollow straight pipe (12). The first flange plate (1112) is located at the end of the first connecting section (1111) away from the hollow straight pipe (12). The first flange plate (1112) protrudes out of the outer side of the first connecting section (1111). The main pipe (10) also includes a first reinforcing member (1113). The first reinforcing member (1113) is disposed between the first flange plate (1112) and the first connecting section (1111). The side of the first flange plate (1112) near the first connecting section (1111) and the outer wall of the first connecting section (1111) are both connected to the first reinforcing member (1113).

8. The upper liquid manifold according to claim 7, characterized in that, The first reinforcing member (1113) is a reinforcing plate; and / or, The side of the first flange plate (1112) closest to the first connecting section (1111) is set at a first predetermined angle A with the side of the first flange plate (1112) furthest from the first connecting section (1111), where 1° ≤ A ≤ 2°; and / or, The edge of the first reinforcing member (1113) on the side away from the first connecting section (1111) extends at a third predetermined angle α with the extension direction of the first flange plate (1112), where 30°≤α≤60°.

9. The upper liquid manifold according to claim 5, characterized in that, The intermediate connecting part (112) includes an intermediate connecting section (1122) and an intermediate flange plate (1123) connected along the extension direction of the connecting channel. The intermediate connecting section (1122) extends along the extension direction of the connecting channel and is connected to the hollow straight pipe (12). The intermediate flange plate (1123) is located at the end of the intermediate connecting section (1122) away from the hollow straight pipe (12). The intermediate flange plate (1123) protrudes out of the outer side of the intermediate connecting section (1122). The main pipe (10) also includes an intermediate reinforcing member (1124). The intermediate reinforcing member is disposed between the intermediate flange plate (1123) and the intermediate connecting section (1122). The side of the intermediate flange plate (1123) near the intermediate connecting section (1122) and the outer wall of the intermediate connecting section (1122) are both connected to the intermediate reinforcing member (1124).

10. The upper liquid manifold according to claim 5, characterized in that, The second connecting part (113) includes a second connecting section (1131) and a second flange plate (1132) connected along the extension direction of the connecting channel. The second connecting section (1131) extends along the extension direction of the connecting channel and is connected to the hollow straight pipe (12). The second flange plate (1132) is located at the end of the second connecting section (1131) away from the hollow straight pipe (12). The second flange plate (1132) protrudes out of the outer side of the second connecting section (1131). The main pipe (10) also includes a second reinforcing member (1133). The second reinforcing member (1133) is disposed between the second flange plate (1132) and the second connecting section (1131). The side of the second flange plate (1132) near the second connecting section (1131) and the outer wall of the second connecting section (1131) are both connected to the second reinforcing member (1133). The second connecting portion (113) includes a lifting lug (13) connected to both the second connecting section (1131) and the second flange plate (1132), the lifting lug (13) being formed in the area between the second connecting section (1131) and the second flange plate (1132); and / or, The second connecting segment (1131) is an arc-shaped connecting segment, and a flushing port (1224) is provided on the arc-shaped connecting segment. The axis of the flushing port (1224) coincides with the normal of the arc-shaped connecting segment at the flushing port (1224).

11. The upper liquid manifold according to claim 4, characterized in that, The liquid outlet channel (122) includes a first connecting channel (1222) and a second connecting channel (1223) connected in sequence. The first connecting channel (1222) is located on the side of the second connecting channel (1223) closer to the liquid inlet channel (121). The connection between the first connecting channel (1222) and the second connecting channel (1223) is opposite to the portion between two of the multiple connecting ports (1221) located away from the liquid inlet. The first connecting channel (1222) forms at least a portion of the liquid outlet channel (122), and the second connecting channel (1223) is a channel of equal diameter.

12. The upper liquid manifold according to claim 11, characterized in that, The hollow straight tube (12) has a uniform wall thickness structure; or, Along the extension direction from the first connecting channel (1222) to the second connecting channel (1223), the wall thickness of the section of the hollow straight pipe (12) that surrounds the second connecting channel (1223) gradually increases.

13. The upper liquid manifold according to claim 11, characterized in that, The liquid inlet channel (121) is a channel of constant diameter; and / or, The connection between the liquid inlet channel (121) and the first connecting channel (1222) is smoothly transitioned; and / or, The connection between the first connecting channel (1222) and the second connecting channel (1223) is smoothly transitioned.

14. The upper liquid manifold according to claim 11, characterized in that, The centers of all the cross-sections of the first connecting channel (1222) are located on the same plane; and / or, The outlet channel (122) is provided with a flushing port (1224) at one end away from the inlet channel (121). The upper liquid manifold also includes a detection element (20), which is located at the flushing port (1224) and blocks the flushing port (1224). The detection element (20) is a flow sensor or a pressure sensor; and / or, The hollow straight pipe (12) is provided with an installation interface (123). The installation interface (123) is located on the side of the hollow straight pipe (12) away from the flange connection (11). The installation interface (123) has an installation channel, which is connected to the first connecting channel (1222). The tangent at the connection between the installation channel and the first connecting channel (1222) is set at a second predetermined angle with the extension direction of the installation channel.

15. The upper liquid manifold according to claim 11, characterized in that, A flushing port (1224) is formed at the end of the second connecting channel (1223) away from the first connecting channel (1222). Wherein, the diameter of the flushing port (1224) is equal to the diameter of the second communicating channel (1223); and / or, The axis of the flushing port (1224) extends horizontally; and / or, The periphery of the flushing port (1224) is tangent to the inner wall of the second connecting channel (1223).

16. The upper liquid manifold according to claim 15, characterized in that, The upper liquid manifold also includes a sealing plug (90), which is detachably disposed at the flushing port (1224) to block or avoid the flushing port (1224); The upper liquid manifold further includes a snap-fit ​​element (100), which is movably disposed at the flushing port (1224). The snap-fit ​​element (100) has a snap-fit ​​position for snapping onto the sealing plug (90) or a clearance position for avoiding the sealing plug; and / or, The sealing plug (90) is provided with a positioning step surface for abutting and positioning with the end of the flushing port (1224); and / or, The sealing plug (90) is filled in the liquid outlet channel (122) at the location between the flushing port (1224) and the one of the plurality of connecting ports (1221) closest to the flushing port (1224), and the sealing plug (90) has an inclined sealing surface at one end inside the liquid outlet channel (122).

17. The upper liquid manifold according to claim 4, characterized in that, The liquid outlet channel (122) is provided with a plurality of side branch ports (124) spaced apart along the extension direction of the liquid outlet channel (122), and the plurality of side branch ports (124) are spaced apart from the plurality of connecting ports (1221); The axis of the side branch port (124) is set at a fourth predetermined angle β with the plate surface of the flange connection (11) on the side away from the hollow straight pipe (12), where 10°≤β≤30°; and / or, The upper liquid manifold also includes an installation protrusion (30), a connector (60), and a union assembly (40) and a plug (50) connected to each other. The installation protrusion (30) is disposed on the outer side wall of the main pipe (10) and protrudes from the outer side wall of the main pipe (10). At least a portion of the union assembly (40) is disposed at the side branch port (124). One end of the connector (60) is connected to the plug (50), and the other end of the connector (60) is provided with an installation hole adapted to the installation protrusion (30). The other end of the connector (60) is sleeved on the installation protrusion (30) through the installation hole.

18. The upper liquid manifold according to claim 4, characterized in that, The liquid outlet channel (122) is provided with a side branch port (124) spaced apart from the communication port (1221); the liquid inlet manifold also includes a side branch pipe (110), which is connected to the hollow straight pipe (12), and the inner cavity of the side branch pipe (110) is connected to the side branch port (124); Wherein, the axis of the inner cavity of the side branch pipe (110) coincides with the axis of the side branch pipe opening (124); and / or, The outer edge of one side of the side branch pipe (110) is connected to the flange connection (11), and the outer edge of the other side of the side branch pipe (110) is set at a fifth predetermined angle γ with the horizontal plane, 1°≤γ≤2°; and / or, The side branch pipe (110) is provided with a first connection structure at the end away from the hollow straight pipe (12), the first connection structure including at least one of a snap-fit ​​structure, a thread and a connection groove.

19. The upper liquid manifold according to any one of claims 3 to 18, characterized in that, The inner wall of the liquid inlet channel (121) and / or the inner wall of the liquid outlet channel (122) are provided with an anti-corrosion and wear-resistant layer, the anti-corrosion and wear-resistant layer being made of at least one of epoxy resin and polyester resin; and / or, The main pipe (10) is an eccentric reducer, and the main pipe (10) has a constant wall thickness structure or a variable wall thickness structure; and / or, The liquid inlet is provided with a second connection structure, which includes at least one of a snap-fit ​​structure, a thread, and a connecting groove.

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