A square double u joint

Abstract

This utility model discloses a square double-U connector, including a connector body, an insert, and a safety valve assembly. The connector body has a cavity, and the insert divides the cavity into two parts, which are connected by a through-hole. A safety valve assembly is located at the bottom of the insert, with one through-hole connected to the safety valve assembly via a flow channel. The safety valve assembly includes a valve ball, a spring, and a plug. A drain hole is located at the bottom of the connector body, and its upper end is connected to the safety valve assembly. This utility model is not only low-cost but also simple to manufacture. The safety valve structure inside the insert increases the inlet pressure when sediment or dirt accumulates and clogs the through-hole. When this pressure exceeds the spring's elasticity, the valve ball is pushed open, the spring is compressed, and the accumulated sediment is flushed out of the flow channel by the water, thus achieving internal cleaning and preventing clogging of the double-U connector.

Description

Technical Field

[0001] This utility model relates to the field of ground source heat pump technology, and in particular to a square double U-shaped connector. Background Technology

[0002] Under the national dual-carbon policy, all industries are accelerating their efforts to reduce carbon emissions and vigorously developing renewable energy. As a result, traditional wall-hung boilers are decreasing in heating, while geothermal energy is developing rapidly, and ground source heat pumps are becoming increasingly widespread. The U-shaped connector is crucial in ground source heat pump systems, connecting the inlet and outlet pipes and playing a key role in effective heat exchange. Currently, most U-shaped connectors on the market are made using a split-body welding process (e.g., patent CN206018101U, a double U-shaped connector for buried pipes). This allows for the formation of an internal cavity for water exchange, but this method is costly, requiring two molds, and the welded surface is rough with weld beads. Over time, sediment and scale easily accumulate inside the cavity of the U-shaped connector, making it difficult to clean and clogging the water passages, leading to system failure and eventual scrapping. Utility Model Content

[0003] To address the aforementioned problems, this utility model aims to provide a square double U-shaped connector to solve the issue of mud and sand accumulating and clogging the double U-shaped connector.

[0004] The technical problem solved by this utility model can be achieved by the following technical solution: a square double U-shaped connector, including a connector body, an insert and a safety valve assembly. The connector body has a cavity, and the insert is provided in the cavity. The insert has four through holes, which divide the cavity into two parts. The two parts of the cavity are connected by the through holes. The bottom of the insert is provided with a safety valve assembly. One of the through holes is connected to the safety valve assembly through a flow channel. The bottom of the connector body is provided with a drain hole, and the upper end of the drain hole is connected to the safety valve assembly.

[0005] The safety valve assembly includes a valve ball, a spring, and a plug. A valve cavity is located at the bottom of the insert, and the valve ball, spring, and plug are disposed within the valve cavity. A flow channel is provided within the insert, and the valve cavity is connected to one of the through holes on the insert via the flow channel. The valve ball is located at the connection between the flow channel and the valve cavity. A plug is located at the lower end of the valve cavity, and a spring is disposed between the valve ball and the plug. The upper end of the spring contacts the valve ball, and the lower end contacts the plug. A channel is provided in the center of the plug, and the two ends of the channel are respectively connected to the drain hole of the valve cavity and the connector body. The plug and the insert are connected by threads.

[0006] The drain hole is threaded, and when a counterweight needs to be added to the double U-joint, the drain hole is threadedly connected to the counterweight.

[0007] The side of the connector body is provided with grooves.

[0008] The upper part of the connector body is provided with four branches, two of which are connected to the water inlet pipe and two of which are connected to the water outlet pipe. There are two cavities, one is the water inlet cavity and the other is the water outlet cavity. The water inlet cavity is connected to two water inlet pipes and the water outlet cavity is connected to two water outlet pipes. The water inlet cavity and the water outlet cavity are connected through a through hole.

[0009] The upper part of the connector body is square, and the lower part is conical.

[0010] Compared with the prior art, this utility model has the following advantages: The utility model incorporates a plastic insert inside the connector body, which is not only low-cost but also simple to mold. The insert contains a safety valve structure to achieve a self-cleaning function and prevent clogging of the double-U connector. Grooves on the surface of the connector body facilitate the lowering of the double-U connector into the well. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 This is a schematic diagram of the structure of this utility model; Figure 4 This is a top view of the present invention; Figure 5 This is a schematic diagram of the structure of the insert of this utility model; Figure 6 This is a schematic diagram of the structure of the insert of this utility model; Figure 7 This is a schematic diagram of the structure of the insert of this utility model; In the diagram: 1-Connector body, 2-Insert, 3-Valve ball, 4-Spring, 5-Plug, 1-1-Groove, 1-2-Drain hole, 1-3-Interface, 2-1-Flow channel, 2-2-Through hole, 5-1-Channel. Detailed Implementation

[0012] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0013] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0014] Combined with appendix Figures 1 to 7 As shown, this embodiment discloses a square double U-shaped connector, including a connector body 1, an insert 2, and a safety valve assembly. The square double U-shaped connector is integrally formed by injection molding. The connector body 1 has a cavity, and the insert 2 is disposed in the cavity. The insert 2 has four through holes 2-2, which divide the cavity into two parts. The two parts of the cavity are connected by the through holes 2-2. The bottom of the insert 2 is provided with a safety valve assembly. One of the through holes 2-2 located at the bottom is connected to the safety valve assembly through a flow channel 2-1. The bottom of the connector body 1 is provided with a drain hole 1-2, and the upper end of the drain hole 1-2 is connected to the safety valve assembly.

[0015] The drain hole 1-2 at the bottom of the connector body 1 has two main functions: one is to facilitate the discharge of mud and sand when the double U connector is clogged; the other is to connect the double U connector to the counterweight block when the working conditions require it. The drain hole 1-2 is threaded. When a counterweight needs to be added to the double U connector, the drain hole 1-2 is threaded to the counterweight block. After the counterweight block is connected, the safety valve assembly cannot be used to discharge mud and sand.

[0016] The upper part of the connector body 1 is square, and the lower part is conical. Grooves 1-1 are provided on the four side surfaces of the connector body 1. The grooves 1-1 are arc-shaped. The grooves 1-1 increase the gap between the connector body 1 and the well, allowing the mud to overflow better and making it easier to lower the connector body 1 into the well.

[0017] The upper part of the connector body 1 is provided with four branches 1-3, two of which are connected to the water inlet pipe and two of which are connected to the water outlet pipe. One of the two cavities is the water inlet cavity and the other is the water outlet cavity. The water inlet cavity is connected to two water inlet pipes and the water outlet cavity is connected to two water outlet pipes. The water inlet cavity and the water outlet cavity are connected through the insert through hole 2-2, which is used for water inlet and outlet flow.

[0018] The safety valve assembly includes a valve ball 3, a spring 4, and a plug 5. The bottom of the insert 2 has a valve cavity, within which the valve ball 3, spring 4, and plug 5 are disposed. A flow channel 2-1 is provided within the insert 2. The valve cavity is connected to one of the through holes 2-2 on the insert 2 via the flow channel 2-1. The valve ball 3 is located at the connection between the flow channel 2-1 and the valve cavity. A plug 5 is located at the lower end of the valve cavity. A spring 4 is positioned between the valve ball 3 and the plug 5, with its upper end contacting the valve ball 3 and its lower end contacting the plug 5. A channel 5-1 is provided in the center of the plug 5, with both ends connecting to the valve cavity and the drain hole 1-2 of the connector body 1, respectively. The plug 5 is threadedly connected to the insert 2 to support the spring 4.

[0019] When the mud and dirt inside the connector body 1 accumulate and block the through hole 2-2, the pressure at the inlet increases. When it exceeds the elastic force of the spring 7, the valve ball 3 is pushed open, the spring 7 is compressed, and the mud and dirt accumulated inside the connector body 1 are flushed out of the flow channel 2-1 by the water and discharged through the drain hole 1-2 at the bottom, thereby achieving internal cleaning and preventing the double U connector from becoming blocked.

[0020] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the utility model. Any simple modifications, equivalent changes, or alterations made to the above embodiments based on the technical principles of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A square double U-shaped connector, comprising a connector body (1), an insert (2), and a safety valve assembly, characterized in that: The connector body (1) has a cavity inside, and an insert (2) is provided inside the cavity. The insert (2) has multiple through holes (2-2). The insert (2) divides the cavity into two parts, and the two cavities are connected through the through holes (2-2). A safety valve assembly is provided at the bottom of the insert (2). One of the through holes (2-2) is connected to the safety valve assembly through a flow channel (2-1). A drain hole (1-2) is provided at the bottom of the connector body (1). The upper end of the drain hole (1-2) is connected to the safety valve assembly.

2. A square double U-shaped connector according to claim 1, characterized in that: The safety valve assembly includes a valve ball (3), a spring (4), and a plug (5). The bottom of the insert (2) is provided with a valve cavity. The valve ball (3), spring (4), and plug (5) are disposed in the valve cavity. The insert (2) is provided with a flow channel (2-1). The valve cavity is connected to one of the through holes (2-2) on the insert (2) through the flow channel (2-1). The valve ball (3) is disposed at the connection between the flow channel (2-1) and the valve cavity. The lower end of the valve cavity is provided with a plug (5). The spring (4) is disposed between the valve ball (3) and the plug (5). The upper end of the spring (4) is in contact with the valve ball (3), and the lower end is in contact with the plug (5). The center of the plug (5) is provided with a channel (5-1). The two ends of the channel (5-1) are respectively connected to the valve cavity and the drain hole (1-2) of the connector body (1).

3. A square double U-shaped connector according to claim 2, characterized in that: The plug (5) and the insert (2) are connected by threads.

4. A square double U-shaped connector according to claim 1, characterized in that: The side of the connector body (1) is provided with a groove (1-1).

5. A square double U-shaped connector according to claim 1, characterized in that: The drain hole (1-2) is provided with threads, and the drain hole (1-2) is threadedly connected to the counterweight block.

6. A square double U-shaped connector according to claim 1, characterized in that: The upper part of the connector body (1) is provided with four branches (1-3), two of which are connected to the water inlet pipe and two of which are connected to the water outlet pipe.

7. A square double U-shaped connector according to claim 1, characterized in that: The upper part of the connector body (1) is square and the lower part is conical.

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