KR20240012116A - Strainer - Google Patents

Abstract

One embodiment of the present invention includes a housing having an inlet end through which a fluid flows in and an outlet end through which the fluid is discharged, a filter assembly mounted between the inlet end and the outlet end, and an inside of the filter assembly through which the fluid passes. Disclosed is a strainer including screw blades disposed.

Description

Strainer {Strainer}

The present invention relates to strainers.

Strainers are installed in pipelines installed in various facilities such as factories and chemical plants to remove foreign substances in the fluid. A filter structure is used in the strainer to filter fluid and capture foreign matter, but as the amount of foreign matter captured in the filter structure increases, the flow rate of the fluid decreases, so it is necessary to clean the filter regularly.

When using a strainer continuously, you should periodically replace the filter screen of the strainer if it is worn or damaged, or remove foreign substances from the filter screen. For example, to replace the filter net, the strainer and the pipe must be uncoupled, the strainer removed from the pipe, and then the strainer's filter net must be separated. However, since the pipe and the strainer are connected by nuts or bolts, it is difficult to replace the filter net without a separate extension. , the replacement and reassembly processes are cumbersome.

In addition, clearance inevitably occurs during the separation and reassembly process, and corrosion may occur from the damaged area due to friction during installation and removal of the filter net, and corrosion occurs due to vibration due to fluid flow due to clearance. There is.

Accordingly, there is a need for a technology that increases the filtration efficiency of the filter network without loss of fluid pressure and flow rate and allows long-term use without separating or replacing the filter network.

The present invention can provide a strainer that is installed in a pipe and can filter foreign substances contained in a fluid.

One embodiment of the present invention includes a housing having an inlet end through which fluid flows in and an outlet end through which the fluid is discharged, a filter assembly mounted between the inlet end and the outlet end and through which the fluid passes, and an interior of the filter assembly. A strainer including screw blades disposed on is provided.

Additionally, the filter assembly may include a first filter net disposed adjacent to the screw blade and a second filter net disposed outside the first filter net.

Additionally, the filter assembly may have a mesh size different from that of the first filter network and a mesh size of the second filter network.

Additionally, the housing is disposed between the inlet end and the outlet end and may have an insertion end into which the filter assembly is inserted.

Additionally, the screw blade extends along the longitudinal direction of the filter assembly and may have a shaft disposed in the center and wings disposed outside the shaft and having a spiral shape.

In addition, it may further include a first connector disposed at one end of the filter assembly and a second connector disposed at the other end of the filter assembly, and the shaft may be supported by the first connector and the second connector.

Additionally, the first connector and the second connector may have a plurality of through holes.

Additionally, the screw blades may rotate within the filter assembly.

In addition, it may further include a check valve connected to an end of the filter assembly and a pressure sensor that senses fluid pressure inside the filter assembly.

Additionally, the check valve opens when the pressure sensor exceeds a preset pressure and discharges the internal fluid of the filter assembly to the outside of the housing.

Other aspects, features and advantages in addition to those described above will become apparent from the following drawings, claims and detailed description of the invention.

The strainer according to the present invention can induce smooth circulation of fluid without foreign substances accumulating inside the strainer even during long-term use.

1 is a diagram of a strainer according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of the strainer of Figure 1.
Figure 3 is a cross-sectional view of the strainer of Figure 1.
FIG. 4 is a diagram illustrating the filter assembly of the strainer of FIG. 1.
Figure 5 is a cross-sectional view taken along line I-I of Figure 4.
Figure 6 is a diagram showing a strainer according to another embodiment of the present invention.
Figure 7 is a diagram showing a strainer according to another embodiment of the present invention.

Hereinafter, the configuration and operation of the present invention will be described in detail with reference to embodiments of the present invention shown in the attached drawings.

Since the present invention can be modified in various ways and can have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various forms.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. When describing with reference to the drawings, identical or corresponding components will be assigned the same reference numerals and redundant description thereof will be omitted. .

In the following embodiments, terms such as first and second are used not in a limiting sense but for the purpose of distinguishing one component from another component.

In the following examples, singular terms include plural terms unless the context clearly dictates otherwise.

In the following embodiments, terms such as include or have mean that the features or components described in the specification exist, and do not exclude in advance the possibility of adding one or more other features or components.

In the drawings, the sizes of components may be exaggerated or reduced for convenience of explanation. For example, the size and thickness of each component shown in the drawings are shown arbitrarily for convenience of explanation, so the present invention is not necessarily limited to what is shown.

FIG. 1 is a diagram of a strainer 10 according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the strainer 10 of FIG. 1, and FIG. 3 is a cross-sectional view of the strainer 10 of FIG. 1.

Referring to FIGS. 1 to 3, the strainer 10 may be installed between piping lines that transport fluid. Piping lines can be set up in various ways depending on the type of fluid or installation location. For example, the strainer 10 may be installed in various pipes to filter foreign substances contained in fluids such as oil, water, gas, and steam.

The strainer 10 may include a housing 100, a filter assembly 200, and a screw blade 300 disposed inside the filter assembly 200.

The strainer 10 may be installed between the first pipe (P1) and the second pipe (P2) through which fluid moves. For example, the strainer 10 is installed at a location connecting the first pipe (P1) to the second pipe (P2), and removes foreign substances contained in the fluid moving from the first pipe (P1) to the second pipe (P2). can be removed.

In detail, the fluid moves from the first pipe (P1) to the second pipe (P2), and the strainer 10 is installed between the first pipe (P1) and the second pipe (P2) to remove foreign substances contained in the fluid. can be filtered.

The housing 100 forms the exterior of the strainer 10 and may be installed between the first pipe (P1) and the second pipe (P2). The housing 100 may include an inlet end 110 through which fluid flows in, and an outlet end 120 through which fluid is discharged. Additionally, the housing 100 may include an insertion end 130 disposed between the inlet end 110 and the outlet end 120.

In the drawing, the housing 100 is shown to have three openings, but it is not limited to this and may be set differently depending on the shape of the pipe to be installed or the installation location. However, hereinafter, for convenience of explanation, the first pipe (P1) is connected to the inlet end 110, the second pipe (P2) is connected to the outlet end 120, and the filter assembly ( The description will focus on an embodiment in which 200) is installed.

The inlet end 110 may be connected to the first pipe (P1). The entrance end 110 may include a first opening 111, a first flange 112, and a first flange hole 113.

The first opening 111 may be installed to be connected to the first pipe (P1). The first opening 111 may be formed to face the first pipe P1 and extend toward the first pipe P1. The first flange 112 is formed along the outer peripheral surface of the first opening 111 and may be provided with a first flange hole 113 for being fixed to the first pipe P1.

The outlet end 120 may be connected to the second pipe (P2). The outlet end 120 may include a second opening 121, a second flange 122, and a second flange hole 123.

The second opening 121 may be installed to be connected to the second pipe (P2). The second opening 121 may be formed to face the second pipe (P2) and extend toward the second pipe (P2). The second flange 122 is formed along the outer peripheral surface of the second opening 121 and may be provided with a second flange hole 123 for being fixed to the second pipe P2.

The insertion end 130 is equipped with the filter assembly 200 and may be disposed between the inlet end 110 and the outlet end 120. The insertion end 130 may include a third opening 131, a third flange 132, and an opening and closing member 133.

The third opening 131 is formed as an open opening to allow the filter assembly 200 to be inserted, and the third flange 132 may be disposed at an end of the third opening 131.

The opening and closing member 133 may be installed in the third opening 131 of the insertion end 130. The opening and closing member 133 may be arranged to be in contact with the third flange 132. When performing work to remove contaminants inside the filter assembly 200, the user can simply separate the opening and closing member 133 from the insertion end 130 to remove contaminants or deposits.

The opening and closing member 133 covers the outside of the insertion end 130 to prevent the filter assembly 200 disposed inside the insertion end 130 from being separated.

The opening and closing member 133 may be mounted on the insertion end 130 in various ways. As an example, the opening and closing member 133 may be assembled with the insertion end 130 by screwing. As shown in Figure 2, threads are formed on the outer peripheral surface of the opening and closing member 133 and the inner peripheral surface of the insertion end 130, so that the opening and closing member 133 can be installed on the insertion end 130 by screwing. As another example, the opening and closing member 133 may be fixed to the insertion end 130 by a fixing member (not shown) such as a bolt, nut, screw, nail, or rivet.

FIG. 4 is a view showing the filter assembly 200 of the strainer 10 of FIG. 1, and FIG. 5 is a cross-sectional view taken along line I-I of FIG. 4.

2 to 5, the filter assembly 200 may be mounted inside the insertion end 130. The filter assembly 200 may include a filter member 210, a first connector 221, and a second connector 222.

The filter member 210 is disposed inside the filter assembly 200 and can filter foreign substances so that they are not discharged to the outlet end 120.

The filter member 210 has an internal space and may have various shapes. However, for convenience of explanation, the following description will focus on an embodiment having a cylindrical filter net.

The filter member 210 may have a space within which fluid can move and where the screw blade 300 can be installed. Fluid moves into the inner space of the filter member 210, and foreign substances may be trapped in the inner space of the filter member 210.

The filter member 210 is provided with a mesh, so that foreign substances are filtered through the mesh and the filtered fluid can be discharged to the outlet end. The filter member 210 may be formed of a commonly used mesh material, and preferably may be formed of a rigid material such as stainless steel or coated iron.

The filter member 210 may include at least one filter network. The filter member 210 may have a single-layer filter network or may be formed by overlapping two or more filter networks. However, for convenience of explanation, hereinafter, the filter member 210 will be described focusing on an embodiment provided with a first filter net 211 and a second filter net 212.

The first filter net 211 may be disposed adjacent to the screw blade 300, and the second filter net 212 may be disposed outside the first filter net 211. The first filter network 211 and the second filter network 212 may be arranged to overlap each other.

Since the first filter net 211 and the second filter net 212 are arranged in a double manner, impurities can be prevented from passing through the filter assembly 200 and being discharged.

The first filter net 211 may form the inner surface of the filter member 210. Since the fluid moves along the internal space of the first filtering net 211, foreign substances may not be discharged to the outside by the first filtering net 211 and may remain in the internal space of the first filtering net 211.

The second filter net 212 may form the outer surface of the filter member 210. By the second filter net 212, the fluid that has been primarily filtered by the first filter net 211 is secondarily filtered, and the fluid from which foreign substances have been removed can be discharged to the outside of the filter assembly 200.

Figure 6 is a diagram showing a strainer according to another embodiment of the present invention.

Referring to FIG. 6, the filter assembly 200 may have filter members 210 with different mesh sizes.

The first filter net (211A) and the second filter net (212A) may have different mesh sizes. The mesh size of the first filtration network 211A may be set to be smaller than that of the second filtration network 212A.

For example, the first filter net 211 may form a small-sized mesh using a wire of relatively small thickness. The second filter net 212 can form a large-sized mesh using a wire with a relatively large thickness.

The first filter network 211 has a relatively small mesh size, so it can effectively filter foreign substances in the fluid flowing into the filter assembly 200.

Since the second filter net 212 uses a wire with a large thickness, the filter member 210 can have high rigidity. Therefore, even if fluid with a high flow rate flows into the filter assembly 200, the filter member 210 may not be damaged due to the rigidity of the second filter net 212.

Referring again to FIGS. 2 to 5, the first connector 221 and the second connector 222 are connected to the screw blade 300 so that the screw blade 300 is supported in the internal space of the filter assembly 200. You can. In the drawing, the first connector 221 and the second connector 222 are shown to have a plate shape, but this is not limited to this, and the first connector 221 and the second connector 222 rotate the screw blade 300. It can be applied in various ways as a structure that allows the rotation axis to have a constant position. However, for convenience of explanation, the following description will focus on the first connector 221 and the second connector 222 of a plate shape.

The first connector 221 may be placed at one end of the filter assembly 200, and the second connector 222 may be placed at the other end of the filter assembly 200. The first connector 221 may be placed at one end of the filter member 210, and the second connector 222 may be placed at the other end of the filter member 210.

The first connector 221 and the second connector 222 may have a plurality of through holes. The number of through holes provided in the first connector 221 and the second connector 222 is not limited, and may be set in various ways depending on the capacity or limit flow rate of the strainer 10.

In one embodiment, the first connector 221 may include a first base 221a, a 1a through hole 221b, and a 1b through hole 221c.

The first base 221a may be mounted on one end of the filter member 210. The 1a through hole 221b is disposed at the center of the first base 221a, and one end of the screw blade 300 can be inserted. The 1b through hole 221c is disposed around the 1a through hole 221b, and allows fluid to flow into the filter member 210.

In one embodiment, the second connector 222 may include a second base 222a, a 2a through hole 222b, and a 2b through hole 222c.

The second base 222a may be mounted on the other end of the filter member 210. The 2a through hole 222b is disposed at the center of the second base 222a, and the other end of the screw blade 300 can be inserted. The 2b through hole 222c is disposed around the 2a through hole 222b, and allows fluid to flow into the filter member 210.

Filter assembly 200 may be inserted through third opening 131. The filter assembly 200 may be provided with a diameter d1 that is relatively smaller than the diameter of the third opening 131.

Filter assembly 200 may be supported by first connector 221 . At this time, the first connector 221 and the filter member 210 may contact one surface of the partition wall 114 protruding from the inner wall of the housing 100.

The screw blade 300 may be disposed inside the filter assembly 200. The screw blade 300 may include a shaft 310 and wings 320 provided along the circumference of the shaft 310.

The shaft 310 extends along the longitudinal direction of the filter assembly 200 and may be disposed at the center of the filter assembly 200. As an example, one end of the shaft 310 may be inserted into the 1a through-hole 221b of the first connector 221, and the other end may be inserted into the central 2a through-hole 222b of the second connector 222. there is.

The wings 320 are disposed on the outside of the shaft 310 and may be provided in a spiral shape. As an example, the wings 320 may have a preset angle to create a turning force in the flowing fluid.

The drawing shows an embodiment in which the wings 320 extend continuously from one end to the other end of the shaft 310, but the embodiment is not limited thereto. For example, a plurality of wings are provided, and each wing may extend only to a certain section of the shaft.

The screw blade 300 may be rotatably installed inside the filter assembly 200. One end of the shaft 310 is inserted into the 1a through hole 221b of the first connector 221, and the other end is inserted into the 2a through hole 222b of the second connector 222, and the shaft 310 is The first connector 221 and the second connector 222 can be rotated. The screw blade 300 is rotatably installed on the first connector 221 and the second connector 222, respectively, and can be rotated by the fluid when fluid flows into the filter assembly 200.

Hereinafter, a method of allowing fluid to flow into the strainer 10 and removing foreign substances contained in the fluid may be described as follows.

The fluid moves from the first pipe (P1) to the inlet end 110 of the housing 100. Fluid may have a first flow (F1) moving through the filter assembly (200) at the inlet end (110). The fluid moving along the first flow (F1) moves into the internal space of the filter member 210 and can move along the blades 320 of the screw blades 300.

The fluid may have a turning force while moving along the surface of the wing 320 of the screw blade 300. Since the wing 320 has a spiral shape, the fluid moving along the surface of the wing 320 may change from the first flow F1 to the second flow F2 having a turning force.

At this time, the screw blade 300 may rotate by moving in the fluid. As the fluid moves along the surface of the wing 320, force may be applied to the surface of the wing 320. The energy of the fluid is transmitted to the wings 320, and the wings 320 can rotate the shaft 310.

That is, through the filter assembly 200, the fluid may change from the first flow (F1) to the second flow (F2) having a turning force. At this time, the fluid applies energy to the blade 320, and the screw blade 300 can rotate using the received energy as a driving source. Rotation of the screw blade 300 may further amplify the turning force of the second flow (F2).

The fluid may move toward the filter element 210 with the second flow F2. The fluid may be filtered in the filter member 210 and discharged to the outlet end 120. Fluid having a strong turning force can move to the radial outer side of the screw blade 300. The fluid may pass through the first filter net 211 and the second filter net 212 of the filter member 210 and be discharged as a filtered fourth stream F4.

Due to the second flow F2 of fluid, foreign substances may not be deposited on the filter member 210. Since the fluid has a strong swirling force inside the filter assembly 200, foreign substances attached to the filter member 210 are separated. In detail, the rotating second flow F2 can prevent foreign substances from sticking to the inner peripheral surface of the fluid.

Fluid introduced in the first flow (F1) may move into the gap between the wing 320 and the filter member 210. The fluid may form a third flow F3 while moving into the space between the wings 320 and the filter member 210. Since the third flow (F3) merges with the second flow (F2), the third flow (F3) may include a turning force.

Since the space between the wings 320 and the filter member 210 is narrow, the flow rate and hydraulic pressure of the third flow F3 may increase. High-velocity and high-pressure fluid may collide with the inner peripheral surface of the filter member 210.

The fluid that has passed through the filter member 210 may move to the outlet end 120 in the fourth flow F4. The fluid has a turning force and moves in the radial direction by the screw blade 300. That is, the fluid can be quickly discharged to the outside of the filter assembly 200 by the turning force.

In the filter member 210 having a plurality of filter nets, foreign substances may be deposited between the filter nets. The strainer 10 of the present invention is created by moving along the surface of the screw blade 300, and is moved between the first filter net 211 and the second filter net 212 by the turning force strengthened by the rotation of the screw blade 300. It can prevent foreign substances from accumulating. In addition, since high-pressure and high-speed fluid moves between the wings 320 and the first filter net 211, the fluid can prevent foreign substances from accumulating between the first filter net 211 and the second filter net 212.

The strainer 10 according to the present invention allows the fluid passing through the inside of the filter assembly 200 to have a turning force, thereby preventing foreign substances contained in the fluid from deteriorating the filter function. Since the fluid prevents foreign substances from accumulating in the filter assembly 200, the strainer 10 of the present invention can remove foreign substances for a long period of time.

The fluid flowing into the filter assembly 200 has a turning force as it moves along the wings 320 of the screw blades 300, and the turning force can be amplified by the rotation of the screw blades 300. A fluid having a strong swirling force can remove foreign substances attached to the first filter net 211.

Additionally, the fluid flowing into the filter assembly 200 moves into the gap between the wings 320 of the screw blade 300 and the first filter net 211, and moves at high pressure and high speed. At the same time, a strong turning force can be obtained by mixing with a fluid that has a turning force. The fluid can remove foreign substances attached to the first filter net 211.

The sediment filtered through the filter assembly 200 may not be deposited in one place but continuously flows and may not adhere to the mesh of the filter member 210. That is, solid foreign matter that has passed through the first connector 221 does not pass through the first filter net 211 and the second filter net 212, but floats inside the filter assembly 200 according to the flow of the screw blade 300. do. Accordingly, relatively large solid foreign substances may remain along the movement trajectory of the blade 320 inside the filter assembly 200. In addition, foreign matter that has passed through the first filter net 211 according to the flow of fluid is filtered through the second filter net 212, and contaminants may not be discharged into the second pipe P2.

Afterwards, the user can separate only the filter assembly 200 and wash the filter member 210 or proceed with a cleaning operation.

Figure 7 is a diagram showing a strainer according to another embodiment of the present invention.

Referring to FIG. 7, the strainer 10A can be opened and closed according to pressure to remove foreign substances accumulated therein. Compared to the strainer 10 of the above-described embodiment, the strainer 10A is further provided with a pressure adjustment means installed at the insertion end 130, and the following will focus on the differences.

The strainer 10A may further include a check valve 141 and a pressure sensor 142.

The strainer 10A is disposed at the insertion end 130 and may be provided with a check valve 141 that opens or blocks the insertion end 130. In addition, the strainer 10A is disposed at the insertion end 130 and may be provided with a pressure sensor 142 to check the pressure inside the insertion end 130.

The pressure sensor 142 may detect changes in internal pressure of the filter assembly 200. When the internal pressure of the filter assembly 200 exceeds a preset pressure, the control unit (not shown) may open the opening and closing member 133 to remove foreign substances floating inside the filter assembly 200.

The strainer 10A can easily discharge foreign substances inside the filter assembly 200 to the outside. In detail, the strainer 10 can discharge internal foreign substances by means of a check valve 141 that is selectively opened and closed according to the pressure of the internal space. At this time, the standard for operating the check valve 141 may be information sensed by the pressure sensor 142. The check valve 141 can selectively open or close the discharge port according to information sensed by the pressure sensor 142. The check valve 141 opens when the pressure sensor 142 exceeds a preset pressure, and discharges the internal fluid of the filter assembly 200 to the outside of the housing 100A.

As another modified example, a relief valve unit may be provided as a valve element provided in the strainer 10A. The relief valve unit (not shown) automatically operates when the pressure on the inlet side of the filter assembly 200 rises and reaches a predetermined pressure, so that the opening and closing member 133 opens, and the pressure decreases to a certain value, and then the opening and closing member 133 re-opens. ) may be provided to be closed. As an example, the relief valve unit (not shown) may include, for example, a valve spring that applies an elastic restoring force, and may control the opening and closing of the opening and closing member 133 according to an increase in pressure.

Additionally, in an optional embodiment, a relief valve unit (not shown) and a check valve 141 may be installed integrally or in parallel in the strainer 10A. The relief valve unit is installed at the rear of the check valve 141 to prevent backflow of fluid and maintain airtightness inside the pipe, and as a safety valve, it can function so as not to open except in an emergency.

Additionally, in an optional embodiment, the strainer 10A may be equipped with a manual valve (not shown) to allow the user to directly open, close, or maintain the piping flow path. The user can check the pressure level in the pipe and install it to open and close at any time, or it can be installed to open after a certain period has elapsed, as needed.

In an optional embodiment, the strainer 10A further includes a communication module (not shown) to store data on the pressure change of the pressure sensor 142 and the opening amount of the check valve 141 in an external data storage (not shown). can be transmitted to. Accordingly, the strainer 10A can maintain high usage efficiency for a long period of time, and maintenance can be performed by monitoring the collected data.

The strainer (10A) according to the present invention has a relatively simple structure and can remove foreign substances contained in the fluid moving inside the pipe so that they do not float in the pipe. Additionally, by preventing foreign substances from accumulating inside the strainer 10A, it is possible to prevent malfunctions within the device.

As such, the present invention has been described with reference to the embodiments shown in the drawings, but these are merely illustrative, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the attached patent claims.

Specific implementations described in the embodiments are examples and do not limit the scope of the embodiments in any way. Additionally, if there is no specific mention such as “essential,” “important,” etc., it may not be a necessary component for the application of the present invention.

In the specification of the embodiment (particularly in the claims), the use of the term “above” and similar referential terms may refer to both the singular and the plural. In addition, when a range is described in an example, the invention includes the application of individual values within the range (unless there is a statement to the contrary), and is the same as describing each individual value constituting the range in the detailed description. . Lastly, unless the order of the steps constituting the method according to the embodiment is clearly stated or there is no description to the contrary, the steps may be performed in an appropriate order. The embodiments are not necessarily limited by the order of description of the steps above. The use of any examples or illustrative terms (e.g., etc.) in the embodiments is merely for describing the embodiments in detail, and unless limited by the claims, the scope of the embodiments is not limited by the examples or illustrative terms. That is not the case. Additionally, those skilled in the art will recognize that various modifications, combinations, and changes may be made according to design conditions and factors within the scope of the appended claims or their derivatives.

10: Strainer
100: housing
110: entrance end
120: exit end
130: insertion end
200: Filter assembly
300: screw blade

Claims (7)

A housing having an inlet end through which fluid flows in and an outlet end through which the fluid is discharged;
a filter assembly mounted between the inlet end and the outlet end, through which the fluid passes; and
A strainer comprising a screw blade disposed inside the filter assembly. According to claim 1,
The filter assembly is
a first filtering net disposed adjacent to the screw blade; and
A strainer comprising: a second filter net disposed outside the first filter net. According to clause 2,
The filter assembly is
A strainer wherein the mesh size of the first filtration network is different from the mesh size of the second filtration network. According to claim 1,
The housing is
A strainer disposed between the inlet end and the outlet end and having an insertion end into which the filter assembly is inserted. According to claim 1,
The screw blade is
a shaft extending along the longitudinal direction of the filter assembly; and
A strainer disposed on the outside of the shaft and having wings having a spiral shape. According to clause 5,
a first connector disposed at one end of the filter assembly; and
Further comprising a second connector disposed at the other end of the filter assembly,
The strainer wherein the shaft is supported on the first connector and the second connector. According to clause 6,
The first connector and the second connector have a plurality of through holes.

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