Pipeline connecting structure

Abstract

The utility model relates to the technical field of plastic valves, in particular to a pipeline connecting structure. Comprising a valve body connecting pipe part, a connecting pipe and a ball-in nut, thread pairs matched with each other are arranged between the valve body connecting pipe part and the ball-in nut so that the ball-in nut can be screwed on the valve body connecting pipe part, the ball-in nut is used for making the valve body connecting pipe part abut against the contact face of the connecting pipe, a ball-in is assembled on the inner side of the connecting pipe, and the ball-in nut can be screwed on the ball-in nut. One side of the inlet ball abuts against the outer circumferential face of the valve body pipe connecting part to form a first sealing structure, the other side of the inlet ball is tightly matched with the inner side face of the connecting pipe to form a second sealing structure, the pipeline connecting structure further comprises an anti-rotation sleeve, and the anti-rotation sleeve is used for locking the valve body pipe connecting part and the inlet ball nut. The utility model provides a pipeline connecting structure which prevents fluid leakage and ensures reliability and safety in the using process.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic valves, in particular to a pipeline connection structure. Background Art

[0002] In the valve with plastic structure, the movable connection structure between the valve body and the pipeline is usually composed of the valve body connecting part, the connecting pipe and the nut. The end face of the valve body connecting part is designed as an outer conical surface, and one end of the connecting pipe matching it is provided with a trumpet-shaped flared section, and the inner conical surface of the flared section matches the outer conical surface of the valve body connecting part. At the same time, the nut is sleeved on the connecting pipe, and its interior also presents a conical surface, and the valve body connecting part is equipped with a thread matching the nut. During the installation process, the nut is connected to the valve body connecting part through a thread. When the nut is tightened, its inner conical surface will tightly press the flared section of the connecting pipe on the outer conical surface of the valve body connecting part, thereby forming a conical surface seal. However, this structure will be affected by external factors such as medium pressure and equipment vibration in actual application. Due to the effect of such external factors, the threaded connection between the nut and the valve body connecting part may become loose. This looseness will not only reduce the connection force of the thread, but also weaken the sealing performance between the flared pipeline and the valve body. As a result, leakage may occur at the inlet and outlet of the valve body, seriously affecting the reliability of the valve. Such leakage accidents will not only increase the safety risks of users, such as possible fluid leakage safety accidents, but may also cause economic losses to users. Utility Model Content

[0003] In view of the problem that the nut in the existing connection structure between the valve body and the pipeline is easily loosened during use, resulting in leakage at the connection between the valve body connecting pipe and the connecting pipe, the purpose of the utility model is to provide a pipeline connection structure to prevent fluid leakage and ensure reliability and safety during use.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pipeline connection structure, including a valve body connecting portion, a connecting pipe and a bead nut, a mutually matching thread pair is provided between the valve body connecting portion and the bead nut, so that the bead nut can be screwed onto the valve body connecting portion, the bead nut is used to make the contact surface of the valve body connecting portion and the connecting pipe tightly, the inner side of the connecting pipe is equipped with a bead, one side of the bead is abutted against the outer peripheral surface of the valve body connecting portion to form a first sealing structure, and the other side of the bead is tightly matched with the inner side surface of the connecting pipe to form a second sealing structure, the pipeline connection structure also includes an anti-rotation sleeve, and the anti-rotation sleeve is used to lock the valve body connecting portion and the bead nut.

[0005] In the present technical solution, a double sealing structure is formed by the close fit between the bead and the connecting pipe of the valve body. The first sealing structure is formed by the close fit between one side of the bead and the outer peripheral surface of the connecting pipe of the valve body, thereby ensuring the sealing between the connecting pipe and the connecting pipe. The second sealing structure is formed by the close fit between the other side of the bead and the inner side of the connecting pipe, thereby further enhancing the sealing effect, thereby ensuring the smooth flow of liquid or gas in the pipeline and avoiding possible leakage problems. The bead nut is effectively prevented from loosening by locking the connecting pipe of the valve body and the bead nut through the anti-rotation sleeve, which significantly improves the stability and durability of the pipeline connection, reduces the frequency of maintenance and repair, and thus reduces operating costs. This pipeline connection structure makes the installation and disassembly process simple and convenient, and is convenient for daily maintenance and inspection. At the same time, its improved stability and sealing also greatly reduce the occurrence of unexpected failures.

[0006] The utility model is further configured as follows: the bead-in nut is externally mounted on the valve body connecting pipe and the connecting pipe, and the anti-rotation sleeve is externally mounted on the bead-in nut. Through this configuration, by externally mounting the bead-in nut on the valve body connecting pipe and the connecting pipe, and the anti-rotation sleeve is externally mounted on the bead-in nut, a clearly layered assembly structure is formed, which facilitates installation and disassembly. The anti-rotation sleeve is externally mounted on the bead-in nut, which not only increases the stability of the structure and prevents the bead-in nut from loosening, but also provides a certain degree of protection for the internal bead-in nut and the valve body connecting pipe, reducing the potential impact of the external environment on the connection structure.

[0007] The utility model is further configured as follows: a first concave-convex groove is provided on the outer circumference of the bead-entry nut, and a second concave-convex groove is provided on the inner circumference of the anti-rotation sleeve to cooperate with the first concave-convex groove. Through this configuration, when the anti-rotation sleeve is installed on the bead-entry nut, the first concave-convex groove cooperates with the second concave-convex groove to effectively prevent the bead-entry nut from rotating, thereby ensuring the stability of the connection and maintaining the reliability of the connection even in a complex or vibrating working environment. Through the precise cooperation of the first concave-convex groove and the second concave-convex groove, the difficulty of assembly is reduced and the production efficiency is improved.

[0008] The utility model is further configured as follows: an anti-rotation slot is provided on the connecting portion of the valve body, at least one claw is provided on the anti-rotation sleeve, and a groove is provided on the claw for matching the anti-rotation slot. When the anti-rotation sleeve is installed in place, the groove on the claw is tightly matched with the anti-rotation slot, which significantly reduces the relative rotation or displacement between the connecting portion of the valve body and the anti-rotation sleeve, thereby ensuring the stability and reliability of the connection. The design of the anti-rotation slot and the claw makes the installation process simpler and faster. It only needs to align the claw with the anti-rotation slot and then push it in to achieve a stable connection, thereby improving the installation efficiency.

[0009] The utility model is further configured that: the materials of the valve body connecting pipe, the connecting pipe and the bead nut are all plastic. The plastic material has good corrosion resistance and can be used for a long time in a humid and corrosive environment without being easily damaged, which prolongs the service life of the pipeline connection structure and reduces the maintenance cost. The plastic material is easier to process and shape than the metal material, which helps to reduce the production cost and improve the production efficiency. At the same time, the plastic parts are also easier to adjust during the assembly process, which improves the flexibility and efficiency of the assembly.

[0010] The utility model is further configured as follows: the anti-rotation slot and the valve body connecting portion are an integral injection molding structure. When the anti-rotation slot and the valve body connecting portion are integrally injection molded, a seamless connection is formed between the anti-rotation slot and the valve body connecting portion, thereby enhancing the overall structural strength and stability. The integral molding can ensure that the dimensions between the anti-rotation slot and the valve body connecting portion are precisely matched, thereby avoiding the problem of dimensional instability caused by assembly errors. The integral injection molding simplifies the manufacturing process, reduces the assembly links, and thus improves production efficiency and manufacturing consistency.

[0011] The utility model is further configured as follows: a reinforcing rib for reinforcing the anti-rotation slot is provided on the side of the anti-rotation slot away from the connecting pipe. By providing the reinforcing rib on the side of the anti-rotation slot away from the connecting pipe, the structural strength and stability of the anti-rotation slot are enhanced, so that the anti-rotation slot can withstand greater torque and external force, and effectively prevent deformation or damage caused by excessive force. The durability of the anti-rotation slot is improved, and the service life of the entire pipeline connection structure is extended. The anti-rotation slot with structural reinforcement can better fix and support the connecting parts, reducing the safety risks caused by looseness or displacement.

[0012] The utility model is further configured as follows: the side of the connecting pipe equipped with the bead forms a bead inlet, and the bead inlet is arranged facing the thread groove of the bead nut. The side of the connecting pipe equipped with the bead forms a bead inlet, and the bead inlet is arranged directly facing the thread groove of the bead nut, which simplifies the assembly process, and the bead can be placed in the bead inlet more conveniently and intuitively, and then the bead nut is tightened, thereby improving the assembly efficiency. The bead can be aligned with the thread groove more accurately, ensuring the accuracy of assembly, and further improving the stability and reliability of the pipeline connection structure.

[0013] The advantages of the utility model are: (1) a double sealing structure is formed by the close fit between the bead and the connecting pipe of the valve body, wherein the first sealing structure is formed by the close fit between the inner side surface of the bead and the outer peripheral surface of the connecting pipe of the valve body, thereby ensuring the sealing between the connecting pipe and the connecting pipe; the second sealing structure is formed by the close fit between the outer side surface of the bead and the inner side surface of the connecting pipe, thereby further enhancing the sealing effect; (2) fluid leakage is prevented to ensure reliability and safety during use; (3) the valve body connecting pipe and the bead nut are locked by the anti-rotation sleeve, thereby effectively preventing the bead nut from loosening, significantly improving the stability and durability of the pipeline connection, reducing the frequency of maintenance and repair, and thus reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of a pipeline connection structure in one embodiment of the utility model;

[0015] Figure 2 This is a structural diagram of the cooperation between the anti-rotation sleeve and the beaded nut in one embodiment of the utility model;

[0016] Figure 3 A cross-sectional view of a pipeline connection structure in one embodiment of the utility model;

[0017] Figure 4 It is a cross-sectional view of the cooperation between the connecting pipe and the bead nut in one embodiment of the utility model.

[0018] In the figure: 1, valve body connecting pipe; 11, anti-rotation groove; 12, reinforcing rib; 2, connecting pipe; 21, bead; 22, bead inlet; 3, bead nut; 31, first concave-convex groove; 32, thread groove; 4, anti-rotation sleeve; 41, second concave-convex groove; 42, claw; 421, groove. DETAILED DESCRIPTION

[0019] In the description of this embodiment, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore, cannot be understood as a limitation on the utility model. In addition, if the terms "first", "second", and "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0020] The utility model is further described below in conjunction with the accompanying drawings of the specification.

[0021] Embodiment 1:

[0022] Reference Figures 1 to 4 A pipeline connection structure comprises a valve body connecting portion 1, a connecting pipe 2 and a bead nut 3, wherein a threaded pair that cooperates with each other is provided between the valve body connecting portion 1 and the bead nut 3 so that the bead nut 3 can be screwed onto the valve body connecting portion 1, and the bead nut 3 is used to make the contact surface of the valve body connecting portion 1 and the connecting pipe 2 tight, and the inner side of the connecting pipe 2 is equipped with a bead 21, one side of the bead 21 is abutted against the outer peripheral surface of the valve body connecting portion 1 to form a first sealing structure, and the other side of the bead 21 is tightly matched with the inner side surface of the connecting pipe 2 to form a second sealing structure, and the pipeline connection structure also includes an anti-rotation sleeve 4, and the anti-rotation sleeve 4 is used to lock the valve body connecting portion 1 and the bead nut 3.

[0023] In this embodiment, a double sealing structure is formed by the close fit between the bead 21 and the valve body connecting pipe 1 and the connecting pipe 2. The first sealing structure is formed by the close fit between one side of the bead 21 and the outer peripheral surface of the valve body connecting pipe 1, ensuring the sealing between the connecting pipe and the connecting pipe 2; the second sealing structure is formed by the close fit between the other side of the bead 21 and the inner side of the connecting pipe 2, further enhancing the sealing effect, thereby ensuring the smooth flow of liquid or gas in the pipeline and avoiding possible leakage problems. The valve body connecting pipe 1 and the bead nut 3 are locked by the anti-rotation sleeve 4, which effectively prevents the bead nut 3 from loosening, significantly improves the stability and durability of the pipeline connection, reduces the frequency of maintenance and repair, and thus reduces operating costs. This pipeline connection structure makes the installation and disassembly process simple and convenient, and is convenient for daily maintenance and inspection. At the same time, its improved stability and sealing also greatly reduce the occurrence of unexpected failures.

[0024] It can be understood that the expanded pipes at both ends of the valve body are replaced with connecting pipes 2 with bead connections, so that the sealing of the inlet and outlet connecting pipes of the valve body is more reliable.

[0025] Preferably, the assembly is achieved by baking, softening and then embedding the beads into the connecting tube 2.

[0026] refer to Figures 1 to 4 , the bead-in nut 3 is covered on the valve body connecting pipe 1 and the connecting pipe 2, and the anti-rotation sleeve 4 is covered on the bead-in nut 3. By covering the bead-in nut 3 on the valve body connecting pipe 1 and the connecting pipe 2, and covering the anti-rotation sleeve 4 on the bead-in nut 3, a clearly layered assembly structure is formed, which facilitates installation and disassembly. The anti-rotation sleeve 4 is covered on the bead-in nut 3, which not only increases the stability of the structure and prevents the bead-in nut 3 from loosening, but also provides a certain degree of protection for the internal bead-in nut 3 and the valve body connecting pipe 1, reducing the potential impact of the external environment on the connection structure.

[0027] Preferably, an annular groove is provided on the end surface of the valve body connecting pipe so that the connecting pipe 2 can be inserted into the annular groove.

[0028] The outer circumference of the bead-in nut 3 is provided with a first concave-convex groove 31, and the inner circumference of the anti-rotation sleeve 4 is provided with a second concave-convex groove 41 that matches the first concave-convex groove 31. When the anti-rotation sleeve 4 is installed on the bead-in nut 3, the first concave-convex groove 31 and the second concave-convex groove 41 cooperate with each other, effectively preventing the bead-in nut 3 from rotating, ensuring the stability of the connection, and maintaining the reliability of the connection even in a complex or vibrating working environment. The precise cooperation of the first concave-convex groove 31 and the second concave-convex groove 41 reduces the difficulty of assembly and improves production efficiency.

[0029] The valve body connecting pipe part 1 is provided with an anti-rotation slot 11, and the anti-rotation sleeve 4 is provided with at least one claw 42, and the claw 42 is provided with a groove 421 for matching the anti-rotation slot 11. When the anti-rotation sleeve 4 is installed in place, the groove 421 on the claw 42 is tightly matched with the anti-rotation slot 11, which significantly reduces the relative rotation or displacement between the valve body connecting pipe part 1 and the anti-rotation sleeve 4, thereby ensuring the stability and reliability of the connection. The design of the anti-rotation slot 11 and the claw 42 makes the installation process simpler and faster. It only needs to align the claw 42 with the anti-rotation slot 11 and then push it in to achieve a stable connection, which improves the installation efficiency.

[0030] refer to Figures 1 to 4 The materials of the valve body connecting pipe 1, the connecting pipe 2 and the bead nut 3 are all plastic. Plastic materials have good corrosion resistance and can be used for a long time in a humid and corrosive environment without being easily damaged, which prolongs the service life of the pipeline connection structure and reduces maintenance costs. Plastic materials are easier to process and shape than metal materials, which helps to reduce production costs and improve production efficiency. At the same time, plastic parts are easier to adjust during the assembly process, which improves assembly flexibility and efficiency.

[0031] It can be understood that the connection structures are all made of plastic material, and the plastic material has a certain elasticity, which makes it easy to insert or disengage the groove 421 of the claw 42 into or out of the anti-rotation groove 11 of the valve body connecting pipe part 1.

[0032] In one embodiment of the present invention, reference Figures 1 to 4 The anti-rotation slot 11 and the valve body connecting portion 1 are an integral injection molding structure. When the anti-rotation slot 11 and the valve body connecting portion 1 are integrally injection molded, a seamless connection is formed between the anti-rotation slot 11 and the valve body connecting portion 1, thereby enhancing the overall structural strength and stability. The integral molding can ensure that the dimensions between the anti-rotation slot 11 and the valve body connecting portion 1 are precisely matched, thereby avoiding the dimensional instability problem caused by assembly errors. The integral injection molding simplifies the manufacturing process, reduces the assembly links, and thus improves the production efficiency and manufacturing consistency.

[0033] In another embodiment of the present invention, reference Figures 1 to 4 The anti-rotation slot 11 is installed on the valve body connecting portion 1 by fasteners. When the anti-rotation slot 11 and the valve body connecting portion 1 are connected by fasteners, they can be easily disassembled and reinstalled when repair or replacement of parts is required. The fastener connection method allows the valve body connecting portion 1 to match the anti-rotation slots 11 of different specifications or designs, thereby improving the versatility and flexibility of the product. As standard parts, fasteners have relatively low costs and are easy to purchase and manage, which helps to reduce the overall manufacturing cost.

[0034] In one embodiment of the present invention, reference Figure 1 , a reinforcing rib 12 for reinforcing the anti-rotation slot 11 is provided on the side of the anti-rotation slot 11 away from the connecting pipe 2. By providing the reinforcing rib 12 on the side of the anti-rotation slot 11 away from the connecting pipe 2, the structural strength and stability of the anti-rotation slot 11 are enhanced, so that the anti-rotation slot 11 can withstand greater torque and external force, and effectively prevent deformation or damage caused by excessive force. The durability of the anti-rotation slot 11 is improved, and the service life of the entire pipeline connection structure is extended. The anti-rotation slot 11 with structural reinforcement can better fix and support the connecting parts, reducing the safety risks caused by looseness or displacement.

[0035] In one embodiment of the present invention, reference Figure 3 The side of the connecting pipe 2 equipped with the bead 21 forms a bead inlet 22, and the bead inlet 22 is arranged facing the thread groove 32 of the bead nut 3. The side of the connecting pipe 2 equipped with the bead 21 forms a bead inlet 22, and the bead inlet 22 is arranged directly facing the thread groove 32 of the bead nut 3, which simplifies the assembly process, and can more conveniently and intuitively put the bead 21 into the bead inlet 22, and then tighten the bead nut 3, thereby improving the assembly efficiency. The bead 21 can be more accurately aligned with the thread groove 32, ensuring the accuracy of the assembly, and further improving the stability and reliability of the pipeline connection structure.

[0036] Embodiment 2:

[0037] A method for assembling a pipeline connection structure, comprising the pipeline connection structure, and further comprising the following steps:

[0038] Step 1, assemble the bead 21 and the connecting pipe 2 to be installed into one body to form a bead pipeline;

[0039] Step 2: Put the bead nut 3 on the connecting pipe 2 with the bead 21 installed;

[0040] Step 3: Put the bead inlet pipeline on both ends of the valve body connecting pipe part 1;

[0041] Step 4: Tighten the bead nut 3 to the required torque so that the bead 21 and the contact surfaces at both ends of the valve body pipe portion 1 are tightly matched;

[0042] Step five: install the anti-rotation sleeve 4 on the outer sides of the bead-inserted nut 3 and the valve body connecting pipe part 1 to keep the valve body connecting pipe part 1 and the bead-inserted nut 3 relatively still.

[0043] In this embodiment, reference Figures 1 to 4 , assemble the bead 21 and the connecting pipe 2 to be installed into a whole, ensuring the precise positioning and firm connection between the two. By gradually assembling and tightening the bead nut 3, it can be ensured that the bead 21 and the contact surfaces at both ends of the valve body connecting pipe 1 are closely matched, forming a good sealing effect and effectively preventing fluid leakage. The installation of the anti-rotation sleeve 4 keeps the valve body connecting pipe 1 and the bead nut 3 relatively still, effectively preventing the nut from loosening and rotating, thereby enhancing the stability and reliability of the connection structure.

[0044] It can be understood that there is a corresponding relationship between the size of the bead nut 3, the sealing force required for the bead pipeline, and the torque required to tighten the bead nut 3. The sealing force required for the sealing structure of the bead 21 can be calculated and then converted into the tightening torque of the bead nut 3. The bead nut 3 is tightened with a torque wrench according to the required torque, so that the connecting pipe 2 assembled with the bead 21 and the contact surfaces at both ends of the valve body connecting pipe 1 are tightly matched to achieve the force required for sealing, and ensure the reliability of the sealing at both ends of the valve connecting pipe. Then, the anti-rotation sleeve 4 is installed on the bead nut 3, so that the groove 421 of the claw 42 on the anti-rotation sleeve 4 is just stuck in the anti-rotation groove 11 of the valve body connecting pipe 1. The valve body connecting pipe 1 and the bead nut 3 are kept relatively still by the anti-rotation sleeve 4 to prevent the bead nut 3 from loosening. Avoid the loosening of the thread due to the alternating pressure of the medium and the vibration of the equipment, and ensure the reliability and safety of the pipeline connection structure during use.

[0045] The step one also includes:

[0046] The bead 21 is put on the gun head of the bead 21 gun, and the connecting tube 2 to be installed is baked to soften the material of the connecting tube 2 to be installed. After the baking is completed, the bead 21 put on the bead 21 gun is installed into the connecting tube 2 to be installed.

[0047] By putting the bead 21 on the gun head of the bead 21 gun and combining the method of baking to soften the material of the connecting tube 2, the bead 21 can be more easily installed in the connecting tube 2. Baking the connecting tube 2 to be installed effectively softens the tube material, so that when assembling the bead 21, friction and resistance can be reduced, protecting the inner wall of the connecting tube 2 from damage, and ensuring that the bead 21 can fit closely to the inner wall of the connecting tube 2 to form a good sealing effect.

[0048] Preferably, when baking the connecting pipe 2 to be installed, a heat gun is used for baking. The temperature of the heat gun is 450°C, the baking time of the pipeline is 10 to 15 seconds, and the distance between the pipeline and the heat gun is about 10 to 15 mm. After the baking of the connecting pipe 2 to be installed is completed, it is fixed with a clamp, and then the bead 21 on the bead gun 21 is installed in the pipeline.

[0049] The specific description of the present invention in the above embodiments is only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Technical engineers in this field may make some non-essential improvements and adjustments to the present invention based on the contents of the above-mentioned utility model, which fall within the scope of protection of the present invention.

Claims

1. A pipeline connection structure, characterized in that: It includes a valve body connecting portion, a connecting pipe and a bead nut, wherein a threaded pair that cooperates with each other is provided between the valve body connecting portion and the bead nut so that the bead nut can be screwed onto the valve body connecting portion, and the bead nut is used to press the contact surface between the valve body connecting portion and the connecting pipe, and the inner side of the connecting pipe is equipped with a bead, one side of the bead is pressed against the outer peripheral surface of the valve body connecting portion to form a first sealing structure, and the other side of the bead cooperates with the inner side surface of the connecting pipe to form a second sealing structure, and the pipeline connection structure also includes an anti-rotation sleeve, which is used to lock the valve body connecting portion and the bead nut.

2. A pipeline connection structure according to claim 1, characterized in that: The bead-in nut is sleeved on the connecting pipe portion of the valve body and the connecting pipe, and the anti-rotation sleeve is sleeved on the bead-in nut.

3. A pipeline connection structure according to claim 1, characterized in that: A first concave-convex groove is provided on the outer circumferential surface of the bead-entry nut, and a second concave-convex groove matching with the first concave-convex groove is provided on the inner circumferential surface of the anti-rotation sleeve.

4. A pipeline connection structure according to claim 1, characterized in that: The valve body connecting pipe portion is provided with an anti-rotation slot, the anti-rotation sleeve is provided with at least one claw, and the claw is provided with a groove for matching the anti-rotation slot.

5. A pipeline connection structure according to claim 1 or 2 or 3 or 4, characterized in that: The materials of the connecting pipe part of the valve body, the connecting pipe and the bead nut are all plastic.

6. A pipeline connection structure according to claim 4, characterized in that: The anti-rotation slot and the connecting pipe portion of the valve body are an integral injection-molded structure.

7. A pipeline connection structure according to claim 4, characterized in that: A reinforcing rib for reinforcing the anti-rotation slot is provided on a side of the anti-rotation slot away from the connecting pipe.

8. A pipeline connection structure according to claim 1 or 2 or 3 or 4, characterized in that: A bead-entry opening is formed on one side of the connecting pipe equipped with the bead-entry nut, and the bead-entry opening is arranged facing the thread groove of the bead-entry nut.

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