Filter

Abstract

The utility model provides a filter and belongs to the technical field of filtration. The problems of large size and high cost caused by the fact that a backwashing function and a medium flow channel cutting function are achieved at the same time are solved. An inlet and an outlet are formed in the upper portion of the shell, the filter element is fixed in the lower portion of the shell, the reversing piece is arranged in the upper portion of the shell, a first overflowing hole is formed in the side portion of the reversing piece, a second overflowing hole is formed in the center area of the bottom of the reversing piece, the second overflowing hole is communicated with the first overflowing hole and the interior of the filter element, and the outer side face of the reversing piece is a spherical surface. An inlet and an outlet are formed in the reversing part, annular sealing valve seats are arranged in the inlet and the outlet respectively, the two sealing valve seats abut against the two sides of the reversing part respectively, a third overflowing hole is further formed in the side portion of the reversing part and is opposite to the first overflowing hole, an overflowing groove is formed in the reversing part, the overflowing groove penetrates through the bottom of the reversing part, and the third overflowing hole is communicated with the overflowing groove. The filter has the advantages of small size, low cost and the like while having a backwashing function and a medium flow channel cutting function.

Description

Technical Field

[0001] This utility model belongs to the field of filtration technology and relates to a filter. Background Technology

[0002] Currently, filters are used in everyday water pipes to filter water and ensure water quality. For example, the backwashing pre-filter disclosed in patent application number 201920716605.9 includes a body with an inlet and an outlet on the upper outer side, a drain hole that can be opened and closed at the lower end of the body, a water passage chamber connected to the drain hole inside the body, a cylindrical filter element inside the water passage chamber, and a hollow cleaning rod inside the filter element. The upper end of the cleaning rod is open, and an impeller is fixed to the inner side of the cleaning rod. There is a space between the lower end face of the cleaning rod and the filter element to support the rotation of the cleaning rod when water flows through the impeller. The moving support structure has several water spray nozzles radially penetrating the outer side of the cleaning rod, and each water spray nozzle is distributed along the axial direction of the cleaning rod. The upper end of the main body is provided with a rotatable switching head, the upper end of which extends out of the main body. There is a gap between the switching head and the main body that connects the water inlet and the water passage chamber. The lower end of the switching head is located inside the filter element. The lower end face of the switching head is provided with a water inlet hole, which is located above the cleaning rod. The side of the switching head is provided with a water outlet hole that allows the water inlet hole to connect with the water inlet or the water outlet when the switching head is rotated.

[0003] During normal water output, the drain hole is closed. Rotating the switching head connects the outlet hole to the inlet hole and the main body's outlet. Water is supplied from the main body's inlet and flows downwards into the water passage chamber through the gap between the main body and the switching head. Because the drain hole is closed, water can only flow into the filter element, where it is filtered and flows upwards from the filter element into the inlet hole, then sequentially through the outlet hole and outlet hole to be discharged. When the filter element needs rinsing, the drain hole is opened. Rotating the switching head connects the outlet hole to the inlet hole and the main body's inlet. Water is supplied from the main body's inlet and sequentially through the outlet hole and inlet hole into the cleaning rod. The cleaning rod rotates rapidly under the action of the impeller and support structure. Simultaneously, the water flowing into the cleaning rod is sprayed outwards from the spray nozzle on the outside of the cleaning rod, washing away impurities and colloids adhering to the filter element. Finally, the wastewater flows from the water passage chamber into the drain hole and is discharged.

[0004] Although the aforementioned reversing seat allows the backwash pre-filter to switch from normal filtration to backwash filter cartridge functionality, it lacks the ability to cut off the flow path. A common solution is to directly connect a ball valve (e.g., a pre-filter disclosed in patent application number 202420103116.7) to the inlet of the backwash pre-filter, using this ball valve to cut off the water flow. However, this additional ball valve increases the overall size and cost. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a filter that solves the problems of large size and high cost caused by simultaneously possessing backwashing and media flow cut-off functions.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A filter includes a housing with an inlet and an outlet on its upper outer side, a filter element fixed in the lower part of the housing, and a reversing member disposed in the upper part of the housing. The reversing member has a first flow hole on its side and a second flow hole in its bottom central region. The second flow hole is connected to the first flow hole and the interior of the filter element. The reversing member is characterized in that its outer surface is spherical, and annular sealing valve seats are respectively disposed in the inlet and outlet. The two sealing valve seats are respectively abutted against the two sides of the reversing member. The reversing member also has a third flow hole on its side, which is opposite to the first flow hole. The first flow hole is located inside one of the sealing valve seats, and the third flow hole is located inside the other sealing valve seat. The reversing member has a flow groove that penetrates the bottom of the reversing member, and the third flow hole communicates with the flow groove.

[0008] Under normal filtration conditions, the third flow hole is connected to the inlet, and the first flow hole is connected to the outlet. Water from the inlet flows into the housing sequentially through the third flow hole and the flow channel, then is filtered by the filter element, and finally flows out sequentially through the second flow hole, the first flow hole, and the outlet. When the filter element needs to be flushed, simply rotate the reversing element 180° to connect the third flow hole to the outlet and the first flow hole to the inlet. Water from the inlet will then flow into the filter element sequentially through the first and second flow holes, flushing away impurities adhering to the filter element as it flows from the inside to the outside. Furthermore, because the outer surface of the reversing element is spherical, annular sealing valve seats are installed in both the inlet and outlet. These two sealing valve seats abut against both sides of the reversing element. Therefore, whether the filter is in normal filtration or backwashing mode, simply rotating the reversing element 90° by controlling the valve stem will block the sealing valve seats on the side of the reversing element, thus cutting off the flow path.

[0009] This filter achieves both backwashing and flow cut-off functions solely through the design of the reversing element. By setting the outer surface of the reversing element to a spherical surface and installing annular sealing valve seats in the inlet and outlet, along with first, second, and third flow holes and flow grooves on the reversing element, this filter eliminates the need for a separate ball valve to provide flow cut-off functionality. This significantly reduces the size and cost of the filter.

[0010] In one of the filters described above, a columnar protrusion is provided in the central region of the bottom of the reversing seat. The protrusion extends into the filter element, and the second flow hole passes through the protrusion.

[0011] A columnar protrusion is provided in the center area of ​​the bottom of the reversing seat, and the second flow hole passes through the protrusion. This means that there is a significant height difference between the bottom of the second flow hole and the bottom of the flow channel. This prevents direct cross-flow between the second flow hole and the flow channel, ensuring that the water flowing out of the flow channel can flow stably into the second flow hole after being filtered by the filter element.

[0012] In one of the above-mentioned filters, the housing is internally threaded with a positioning seat, which is located below the reversing component. The positioning seat has a through hole and several guide holes distributed around the through hole. The through hole is located in the central area of ​​the positioning seat, and the protrusion passes through the through hole of the positioning seat. The upper end of the filter element abuts against the positioning seat, and each guide hole is located on the outer side of the filter element.

[0013] The filter element is a cylindrical shape with an open top. The upper end of the filter element abuts against the positioning seat, and the protrusion passes through the through hole of the positioning seat and is inserted into the filter element. This effectively seals the upper end of the filter element, preventing water flowing out of the flow channel from the top of the filter element from flowing directly into the filter element under normal filtration conditions. This ensures that the water flowing out of the flow channel can only be filtered by the filter element before flowing into the second flow hole.

[0014] In one of the above-mentioned filters, a positioning part is provided protruding from the bottom center area of ​​the positioning seat, a through hole passes through the positioning part, and the upper end of the filter element is sleeved and fixed outside the positioning part.

[0015] The upper end of the filter element is sleeved and fixed outside the positioning part, which is protruding and set in the bottom center area of ​​the positioning seat. The guide holes are distributed around the through hole. This provides a structure for installing the filter element and ensures that the water flowing out of the flow channel cannot flow directly into the filter element when it flows downward.

[0016] In one of the filters described above, the flow channel is an arc-shaped channel arranged around the central axis of the commutator.

[0017] The second flow passage is located in the center area at the bottom of the commutator, while the flow groove is an arc-shaped groove arranged around the central axis of the commutator. This makes the flow groove and the second flow passage independent of each other, and water will not directly flow between them.

[0018] In one of the filters described above, the curvature of the flow channel is greater than 180°.

[0019] The above settings can increase the flow rate of water as it flows out of the flow channel.

[0020] In one of the above-mentioned filters, a valve stem is rotatably installed inside the top of the housing. The lower end of the valve stem is circumferentially fixed to a reversing component. The upper end of the reversing component extends out of the housing and is connected to a handle. The handle is circumferentially fixed to the valve stem and can slide vertically. The bottom of the handle has a socket hole. The handle is sleeved on the top of the housing through the socket hole. A limit block is protruding from the outer periphery of the top of the housing. The handle has an arc-shaped limit groove in the socket hole. The limit block is located in the limit groove. The limit groove is L-shaped. The arc of the wider part of the limit groove is 180°, and the arc of the narrower part of the limit groove is 90°. The up and down movement of the handle can switch the limit block between the wider and narrower parts of the limit groove.

[0021] The valve stem requires a rotation angle of 180° to switch the reversing element from normal filtration state to backwash filter element state, while the valve stem requires a rotation angle of 90° to switch the reversing element from normal filtration state (or backwash filter element 2 state) to flow channel cut-off state. This filter has a limiting block protruding from the top outer periphery of the housing. The handle has an arc-shaped limiting groove inside the socket, and the limiting block is located in the limiting groove. The limiting groove is L-shaped, with the wider part of the groove having an arc of 180° and the narrower part having an arc of 90°. By moving the handle up and down, the limiting block can switch between the wider and narrower parts of the limiting groove. When the limiting block is in the wider part of the limiting groove, the maximum angle that the handle can rotate the valve stem is 180° because the arc of that part of the limiting groove is 180°. When the limiting block is in the narrower part of the limiting groove, the maximum angle that the handle can rotate the valve stem is 90° because the arc of that part of the limiting groove is 90°. With the above settings, users can achieve precise angle control whether switching from normal filtration to backwash filter cartridge mode, or from normal filtration (or backwash filter cartridge mode) to flow channel cut-off mode, thus avoiding excessive rotation of the reversing component.

[0022] In one of the above-mentioned filters, a support spring is provided inside the socket, with the two ends of the support spring abutting against the top surface of the housing and the bottom wall of the socket, respectively.

[0023] The support spring provides elasticity to the handle without external force, ensuring that the handle will not move up and down arbitrarily without external force.

[0024] In one of the above-mentioned filters, a mating part is provided in the central area of ​​the bottom wall of the socket, and a mating hole is provided in the mating part. The mating hole is a non-circular hole. The cross-section of the top of the valve stem is the same as that of the mating hole, and the top of the valve stem is inserted into the mating hole. A connecting screw is provided in the handle. The shank of the connecting screw is inserted into the mating hole with its shank facing downward and is threaded into the top of the valve stem. There is a movable gap between the top surface of the valve stem and the bottom wall of the mating hole.

[0025] The connecting screws ensure that the handle will not detach completely from the valve stem. However, the presence of a movable gap between the top surface of the valve stem and the bottom wall of the mating hole allows the handle to be pressed down relative to the valve stem, thus achieving the switching of the maximum limit angle.

[0026] Compared with existing technologies, this filter sets the outer surface of the reversing element to a spherical surface and sets annular sealing valve seats in the inlet and outlet respectively. At the same time, it sets a first flow passage hole, a second flow passage hole, a third flow passage hole and a flow passage groove on the reversing element. This allows the filter to have both backwashing function and flow cut-off function by relying solely on the setting of the reversing element. Therefore, there is no need to connect a ball valve specifically for flow cut-off function, which greatly reduces the size and cost. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of the filter.

[0028] Figure 2 yes Figure 1 Sectional view along the AA direction.

[0029] Figure 3 yes Figure 1 An enlarged schematic diagram of the upper part of the middle shell.

[0030] Figure 4 This is a three-dimensional schematic diagram of the commutator.

[0031] Figure 5 This is a cross-sectional view of the commutator.

[0032] Figure 6 This is a three-dimensional schematic diagram of the positioning base.

[0033] Figure 7 This is a three-dimensional sectional view of the handle.

[0034] In the diagram, 1. Shell; 1a. Inlet; 1b. Outlet; 1c. Main body; 1c1. Drainage port; 1d. Mounting base; 1e. Limiting block; 2. Filter element; 3. Reversing component; 3a. First flow hole; 3b. Second flow hole; 3c. Third flow hole; 3d. Flow groove; 3e. Connecting part; 3f. Protrusion; 4. Valve stem; 5. Handle; 5a. Socket hole; 5b. Limiting groove; 5c. Mating part; 5d. Concave hole; 6. Sealing valve seat; 7. Support seat; 8. Positioning seat; 8a. Through hole; 8b. Guide hole; 8c. Positioning part; 9. Support spring; 10. Connecting screw; 11. Drain valve. Detailed Implementation

[0035] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0036] like Figures 1-6 As shown, a filter includes a housing 1 with an inlet 1a and an outlet 1b on its upper outer side, a filter element 2 fixed in the lower part of the housing 1, and a reversing member 3 disposed in the upper part of the housing 1. A valve stem 4 is rotatably disposed in the top of the housing 1, and the lower end of the valve stem 4 is circumferentially fixed to the reversing member 3. The upper end of the reversing member 3 extends out of the housing 1 and is connected to a handle 5. A drain port 1c1 is provided at the bottom of the housing 1, and a drain valve 11 is connected to the drain port 1c1. The outer surface of the reversing member 3 is spherical. Annular sealing valve seats 6 are respectively abutted against both sides of the reversing member 3 in the upper part of the housing 1. A first flow hole 3a is provided on the side of the reversing member 3, and a second flow hole 3b is provided in the central area of ​​the bottom. The second flow hole 3b is connected to the first flow hole 3a and the interior of the filter element 2. The reversing component 3 also has a third flow-through hole 3c on its side. The third flow-through hole 3c is positioned opposite to the first flow-through hole 3a. The first flow-through hole 3a is located inside one of the sealing valve seats 6, and the third flow-through hole 3c is located inside the other sealing valve seat 6. The reversing component 3 has a flow-through groove 3d, which is an arc-shaped groove arranged around the central axis of the reversing component 3. The arc of the flow-through groove 3d is greater than 180°. The flow-through groove 3d penetrates the bottom of the reversing component 3, and the third flow-through hole 3c is connected to the flow-through groove 3d. Specifically, the top surface of the reversing component 3 is flat, and a connecting part 3e is protruding from the central area of ​​the top of the reversing component 3. The lower end of the valve stem 4 is circumferentially fixed to the connecting part 3e through a concave-convex fit. In this embodiment, the housing 1 includes a cylindrical body 1c with an open upper end and a mounting seat 1d threadedly connected to the upper end of the body 1c. The inlet 1a and outlet 1b are located on the mounting seat 1d, and support seats 7 are threadedly connected to the inlet 1a and outlet 1b respectively. Two sealing valve seats 6 are respectively disposed on the two support seats 7. Specifically, a columnar protrusion 3f is provided in the bottom center area of ​​the reversing seat. The lower end of the protrusion 3f extends into the filter element 2, and the second flow hole 3b passes through the protrusion 3f. A positioning seat 8 is threadedly connected to the mounting seat 1d of the housing 1. The positioning seat 8 is located below the reversing member 3. The positioning seat 8 is provided with a through hole 8a and a number of guide holes 8b distributed around the through hole 8a. The through hole 8a is located in the center area of ​​the positioning seat 8. The protrusion 3f passes through the through hole 8a of the positioning seat 8. The filter element 2 is a cylindrical shape with an open upper end. The upper end of the filter element 2 abuts against the positioning seat 8, and each guide hole 8b is located on the outside of the filter element 2. A positioning part 8c is provided in the center of the bottom of the positioning seat 8. A through hole 8a passes through the positioning part 8c. The upper end of the filter element 2 is sleeved and fixed outside the positioning part 8c.

[0037] Under normal filtration conditions, the third flow hole 3c is connected to the inlet 1a, and the first flow hole 3a is connected to the outlet 1b. Water from the inlet 1a flows sequentially through the third flow hole 3c, the flow channel 3d, and the guide hole 8b into the housing 1, then is filtered by the filter element 2, and finally flows out sequentially through the second flow hole 3b, the first flow hole 3a, and the outlet 1b. When the filter element 2 needs to be flushed, simply control the valve stem 4 to rotate the reversing component 3 180° and open the drain valve 11 at the bottom of the housing 1, so that the third flow hole 3c is connected to the outlet 1b, and the first flow hole 3a is connected to the inlet 1a. Water from the inlet 1a flows sequentially through the first flow hole 3a and the second flow hole 3b into the filter element 2. As the water flows from the inside of the filter element 2 to the outside, it washes away the impurities attached to the filter element 2, and the wastewater is finally discharged through the drain valve 11.

[0038] In addition, since the outer surface of the reversing component 3 is spherical, and the upper part of the housing 1 is provided with annular sealing valve seats 6 on both sides of the reversing component 3, whether the filter is in normal filtration state or in backwashing filter element 2 state, as long as the valve stem 4 is controlled to drive the reversing component 3 to rotate 90°, the side of the reversing component 3 can block the sealing valve seat 6, thereby cutting off the flow channel.

[0039] Furthermore, such as Figure 1 , Figure 2 , Figure 3 and Figure 7As shown, the handle 5 is circumferentially fixed to the valve stem 4, and the handle 5 can slide vertically. The bottom of the handle 5 has a socket hole 5a, through which the handle 5 is sleeved onto the top of the housing 1. A limiting block 1e protrudes from the outer periphery of the top of the housing 1. The handle 5 has an arc-shaped limiting groove 5b within the socket hole 5a, and the limiting block 1e is located within the limiting groove 5b. The limiting groove 5b is L-shaped, with the wider portion of the groove having an arc of 180° and the narrower portion having an arc of 90°. Moving the handle 5 up and down allows the limiting block 1e to switch between the wider and narrower portions of the limiting groove 5b. A support spring 9 is provided within the socket hole 5a, with its two ends abutting against the top surface of the housing 1 and the bottom wall of the socket hole 5a, respectively. In this embodiment, the narrower portion of the limiting groove 5b is located below the wider portion. A mating part 5c protrudes from the center of the bottom wall of the socket 5a, and a support spring 9 is fitted over the mating part 5c. The mating part 5c contains a mating hole, which is non-circular. The cross-section of the top of the valve stem 4 is the same as that of the mating hole, and the top of the valve stem 4 is inserted into the mating hole. A connecting screw 10 is located inside the handle 5. The shank of the connecting screw 10 extends downward into the mating hole and is threaded into the top of the valve stem 4. A recessed hole 5d is located at the top of the handle 5. The head of the connecting screw 10 is located within the recessed hole 5d, and the bottom wall of the recessed hole 5d abuts against the head of the connecting screw 10. There is a movable gap between the top surface of the valve stem 4 and the bottom wall of the mating hole.

[0040] The valve stem 4 drives the reversing element 3 to switch from the normal filtration state to the backwash filter element 2 state by a rotation angle of 180°, while the valve stem 4 drives the reversing element 3 to switch from the normal filtration state (or the backwash filter element 2 state) to the flow channel cut-off state by a rotation angle of 90°. This filter has a limiting block 1e protruding from the top outer periphery of the housing 1. The handle 5 has an arc-shaped limiting groove 5b within the socket 5a. The limiting block 1e is located within the limiting groove 5b, which is L-shaped. The arc of the wider portion of the limiting groove 5b is 180°, and the arc of the narrower portion is 90°. In the initial state, the limiting block 1e is located within the narrower portion of the limiting groove 5b. Since the arc of this portion of the limiting groove 5b is 90°, the maximum angle that the handle 5 can rotate to drive the valve stem 4 is 90°. If handle 5 is pressed down, the limiting block 1e will be positioned within the wider portion of the limiting groove 5b. Since the curvature of this portion of the limiting groove 5b is 180°, the maximum angle that handle 5 can rotate the valve stem 4 is 180°. This configuration allows for precise angle control when switching from normal filtration to backwash filter element 2, or from normal filtration (or backwash filter element 2) to the flow channel cut-off state, preventing over-rotation of the reversing component 3.

[0041] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A filter comprising a housing (1) with an inlet (1a) and an outlet (1b) on the upper outer side, a filter core (2) fixed to the lower inner side of the housing (1), and a reversing element (3) arranged in the upper inner side of the housing (1), the reversing element (3) being provided with a first flow hole (3a) in the side portion and a second flow hole (3b) in the central area of the bottom portion, the second flow hole (3b) being in communication with the first flow hole (3a) and the interior of the filter core (2) respectively, characterized in that, The outer side of the reversing piece (3) is a spherical surface, and annular sealing valve seats (6) are respectively arranged in the inlet (1a) and the outlet (1b), and the two sealing valve seats (6) abut against the two sides of the reversing piece (3), and the side of the reversing piece (3) is further provided with a third overflow hole (3c), the third overflow hole (3c) is arranged opposite to the first overflow hole (3a), the first overflow hole (3a) is located on the inner side of one of the sealing valve seats (6), the third overflow hole (3c) is located on the inner side of the other sealing valve seat (6), and the reversing piece (3) is provided with an overflow groove (3d) penetrating through the bottom of the reversing piece (3), and the third overflow hole (3c) communicates with the overflow groove (3d).

2. The filter of claim 1, wherein, The bottom center area of the reversing piece (3) is provided with a columnar protruding part (3f) extending into the filter core (2), and the second overflow hole (3b) penetrates through the protruding part (3f).

3. The filter of claim 2, wherein, The shell (1) is threadedly connected with a positioning seat (8) located below the reversing piece (3), the positioning seat (8) is provided with a through hole (8a) and a plurality of flow guide holes (8b) distributed around the through hole (8a), the through hole (8a) is located in the center area of the positioning seat (8), the protruding part (3f) penetrates through the through hole (8a) of the positioning seat (8), the upper end of the filter core (2) abuts against the positioning seat (8), and each flow guide hole (8b) is located on the outer side of the filter core (2).

4. The filter of claim 3, wherein, The bottom center area of the positioning seat (8) is provided with a positioning part (8c), the through hole (8a) penetrates through the positioning part (8c), and the upper end of the filter core (2) is fixedly sleeved on the outside of the positioning part (8c).

5. The filter according to claim 1 or 2 or 3 or 4, characterized in that, The overflow groove (3d) is a circular arc groove arranged around the central axis of the reversing piece (3).

6. The filter of claim 5, wherein, The arc of the overflow groove (3d) is greater than 180°.

7. The filter according to claim 1 or 2 or 3 or 4, characterized in that, The top of the shell (1) is rotatably provided with a valve rod (4), the lower end of the valve rod (4) is circumferentially fixed with the reversing piece (3), the upper end of the reversing piece (3) extends out of the shell (1) and is connected with a handle (5), the handle (5) is circumferentially fixed with the valve rod (4) and can slide vertically, the bottom of the handle (5) has a sleeving hole (5a), the handle (5) is sleeved on the top of the shell (1) through the sleeving hole (5a), the outer circumferential side of the top of the shell (1) is protrudingly provided with a limiting block (1e), the handle (5) is provided with an arc-shaped limiting groove (5b) in the sleeving hole (5a), the limiting block (1e) is located in the limiting groove (5b), the limiting groove (5b) is L-shaped, the arc of the wider part of the slot width in the limiting groove (5b) is 180°, the arc of the narrower part of the slot width in the limiting groove (5b) is 90°, and the up-down movement of the handle (5) can switch the wider part and the narrower part of the slot width in the limiting groove (5b).

8. The filter of claim 7, wherein, The sleeving hole (5a) is provided with a supporting spring (9), and the two ends of the supporting spring (9) abut against the top surface of the shell (1) and the hole bottom wall of the sleeving hole (5a) respectively.

9. The filter of claim 8, wherein, The bottom wall center area of the sleeve joint hole (5a) is provided with a matching part (5c) which is convex, the matching part (5c) is provided with a matching hole, the matching hole is a non-circular hole, the cross section of the top of the valve rod (4) is the same as the matching hole, and the top of the valve rod (4) is inserted into the matching hole, the handle (5) is provided with a connecting screw (10), the rod part of the connecting screw (10) is downwardly inserted into the matching hole and is threadedly connected to the top of the valve rod (4), and the top surface of the valve rod (4) and the hole bottom wall of the matching hole have a movable spacing.

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