CN216048379U - Expansion tank and hanging stove - Google Patents

Abstract

The utility model relates to an expansion water tank and a wall-mounted furnace, wherein the expansion water tank comprises a shell, a flexible part and a driving mechanism; the flexible part is arranged in the shell, the flexible part and the shell are matched to enclose a water cavity with variable space size, and a water inlet communicated with the water cavity is formed in the shell; the driving mechanism is arranged on the shell and used for driving the flexible piece to move along a preset direction so as to adjust the space size of the water cavity. When need crowd the water of water cavity back to the heating system of hanging stove, start actuating mechanism, actuating mechanism drives the flexible piece and moves along predetermineeing the direction, makes the space in water cavity diminish to extrude the water in water cavity through the water inlet, drive the flexible piece motion through actuating mechanism, in the heating system with crowded water back hanging stove in the water cavity, effectively guarantee the stability of pressure among the heating system, avoid the hanging stove because of the not enough trouble that can't start-up that appears of water pressure.

Description

Expansion tank and hanging stove

Technical Field

The utility model relates to the technical field of wall-mounted furnaces, in particular to an expansion water tank and a wall-mounted furnace.

Background

The wall-mounted stove has a powerful household central heating function, can meet the heating requirements of multiple rooms, and can set comfortable temperature in the rooms at will according to the requirements. After the wall-mounted furnace and the heating equipment are installed, water needs to be supplemented to the whole wall-mounted furnace system, the water supplementing pressure is 1-1.5 bar, and the whole system is closed. The expansion water tank is an indispensable part of the wall-mounted boiler as a key component for stabilizing the pressure of a wall-mounted boiler system.

The conventional expansion tank is generally divided into a water chamber and an air chamber by a diaphragm, and nitrogen is injected into the air chamber. When a user starts heating, the water temperature in the heating system rises to cause the volume expansion and the pressure rise of the water, and at the moment, the water in the heating system extrudes the diaphragm of the expansion water tank, so that the extra water after the volume expansion enters the water cavity, and the pressure of the heating system is relieved. When the water temperature of the heating system is reduced, the water volume of the heating system is contracted, the diaphragm extrudes the water in the water cavity back to the heating system under the pressure action of the air cavity, and the pressure of the whole heating system is stabilized within a preset range.

Traditional expansion tank is after using for a long time or if gas tightness goes wrong when production, can lead to the nitrogen gas leakage in the gas chamber, the pressure reduction in the gas chamber, under this state, when heating system's temperature rises the volume inflation, the water that comes out more among the heating system gets into the water cavity, but after heating system's temperature reduces, because the nitrogen gas of gas cavity reveals the pressure reduction that leads to the gas intracavity, expansion tank's diaphragm can't be under the pressure effect of gas cavity with the water extrusion return heating system in water cavity. When the water temperature of the heating system rises again, the excessive water generated by volume expansion can not enter the water cavity of the expansion water tank, the pressure of the heating system rises continuously until the water rises to the system pressure protection value, and the water can be discharged out of the heating system through the safety valve. After heating system's temperature descends, heating system's pressure finally can be less than the start-up water pressure of hanging stove, can lead to hanging stove because of the not enough trouble that can't start-up that appears of water pressure, and expansion tank has just lost the effect of stable system pressure.

SUMMERY OF THE UTILITY MODEL

The first technical problem to be solved by the present invention is to provide an expansion tank which can effectively ensure the stability of pressure in a heating system.

The second technical problem to be solved by the utility model is to provide a wall-mounted furnace which can effectively ensure the stability of the pressure in a heating system.

The first technical problem is solved by the following technical scheme:

an expansion water tank comprises a shell, a flexible part and a driving mechanism; the flexible part is arranged in the shell, the flexible part and the shell are matched to enclose a water cavity with variable space size, and a water inlet communicated with the water cavity is formed in the shell; the driving mechanism is arranged on the shell and used for driving the flexible piece to move along a preset direction so as to adjust the space size of the water cavity.

Compared with the background technology, the expansion water tank of the utility model has the following beneficial effects: when need crowd the water of water cavity back to the heating system of hanging stove, start actuating mechanism, actuating mechanism drives the flexible piece along predetermineeing the direction motion, make the space in water cavity diminish, thereby extrude the water in water cavity through the water inlet, drive the flexible piece motion through actuating mechanism, in the heating system with crowded water back hanging stove of water cavity, effectively guarantee the stability of pressure among the heating system, and then effectively guarantee hanging stove can normal operating, need not to utilize the atmospheric pressure extrusion water cavity of nitrogen gas, avoid leading to the problem that expansion tank became invalid because of nitrogen gas leaks, and then avoid hanging stove because of the not enough trouble that appears of water pressure unable start.

In one embodiment, the housing includes a first housing and a second housing, the flexible member is disposed between the first housing and the second housing, and the flexible member and the first housing cooperate to define the water chamber, the water inlet is disposed on the first housing, and the driving mechanism is disposed on the second housing.

In one embodiment, the flexible member and the second housing are matched to enclose a movable cavity with a variable space size, and the second housing is provided with a pressure relief hole communicated with the movable cavity.

In one embodiment, a first flange which is turned over outwards is arranged at the edge of the first shell, a second flange which is turned over outwards is arranged at the edge of the second shell, the second flange is matched and fastened with the first flange, and the edge of the flexible piece is clamped between the first flange and the second flange.

In one embodiment, the flexible member includes a diaphragm having a rim sealingly connected to an inner peripheral side of the housing.

In one embodiment, the flexible member further includes a spacer attached to the diaphragm, and a rim of the spacer is spaced apart from an inner circumferential side of the housing.

In one embodiment, the edge of the separator plate is provided with a ring extending away from the membrane.

In one embodiment, the driving mechanism comprises a transmission assembly and a driver arranged on the shell and used for driving the transmission assembly to extend or contract, and when the driving mechanism drives the flexible member to move along the preset direction, the transmission assembly is connected with the partition plate.

In one embodiment, the transmission assembly comprises an expansion link connected with the driver and a pressure plate connected with the expansion link, and the pressure plate is detachably attached to one side of the flexible part, which faces away from the water cavity.

The second technical problem is solved by the following technical solutions:

a hanging stove includes foretell expansion tank.

Compared with the background technology, the expansion water tank of the utility model has the following beneficial effects: compared with the background technology, the expansion water tank of the utility model has the following beneficial effects: when need crowd the heating system who returns hanging stove with the water in water cavity in, start actuating mechanism, actuating mechanism drives the flexible piece along predetermineeing the direction motion, make the water in water cavity discharge through the water inlet with the compression water cavity, drive the flexible piece motion through actuating mechanism, in the heating system who returns hanging stove with the water in water cavity crowded, effectively guarantee the stability of pressure in the heating system, and then effectively guarantee hanging stove can normal operating, need not to utilize the atmospheric pressure extrusion water cavity of nitrogen gas, avoid leading to the problem that expansion tank became invalid because of nitrogen gas leaks, and then avoid hanging stove because of the not enough trouble that appears of water pressure unable start.

Drawings

FIG. 1 is a schematic view of an expansion tank according to an embodiment of the present invention with the water chamber in an expanded state;

FIG. 2 is a schematic view of the expansion tank of FIG. 1 with the water chamber in a compressed state;

FIG. 3 is an enlarged view of the expansion tank of FIG. 2 at A;

fig. 4 is an enlarged view of the expansion tank shown in fig. 2 at B.

The meaning of the reference symbols in the drawings is:

the water inlet device comprises a shell 10, a water inlet 11, a first shell 12, a second shell 13, a first flanging 14, a second flanging 15, a water inlet nozzle 16, a pressure relief hole 17, a gap 18, a flexible part 20, a diaphragm 21, a partition plate 22, a ring sheet 23, a water cavity 30, a movable cavity 40, a driving mechanism 50, a transmission assembly 51, a driver 52, an expansion rod 53, a pressure plate 54, a fastening sleeve 55, a bolt 56, a nut 57, a fixing plate 58 and a fastening piece 59.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 to 4, an expansion tank according to an embodiment of the present invention is shown. Referring to fig. 1, the expansion tank includes a housing 10, a flexible member 20 and a driving mechanism 50. The flexible member 20 sets up in casing 10, and flexible member 20 encloses with casing 10 cooperation and establishes into the changeable water cavity 30 of space size, and water cavity 30 is arranged in holding hanging stove's heating system and leads to the water that volume expansion comes more because of the temperature risees, is equipped with the water inlet 11 that communicates water cavity 30 on the casing 10. The driving mechanism 50 is disposed on the housing 10 and is used to drive the flexible member 20 to move so as to adjust the size of the water chamber 30.

Compared with the background technology, the expansion water tank of the utility model has the following beneficial effects: need crowd the water of water cavity 30 back time in the heating system of hanging stove, start actuating mechanism 50, actuating mechanism 50 drives flexible 20 along predetermineeing the direction motion, make the space of water cavity 30 diminish, thereby extrude the water of water cavity 30 through water inlet 11, drive flexible 20 through actuating mechanism 50 and move, in the heating system of hanging stove is crowded back to the water of water cavity 30, effectively guarantee the stability of pressure among the heating system, and then effectively guarantee hanging stove can normal operating, need not to utilize the atmospheric pressure extrusion water cavity 30 of nitrogen gas, avoid leading to the problem that expansion tank became invalid because of nitrogen gas leakage, and then avoid hanging stove because of the not enough trouble that can't start that appears in water pressure.

In addition, the traditional expansion water tank needs a larger space for containing nitrogen, so that the whole volume of the expansion water tank is larger, the installation space is occupied, and the transportation is inconvenient; for example, the internal volume of a traditional expansion tank is generally 6L-8L, but the effective volume for containing water is about 2L-2.5L, and the rest volumes are all used for containing 1bar of nitrogen. The expansion water tank provided by the utility model does not need to be provided with a space for containing nitrogen, so that the internal space of the expansion water tank can be effectively reduced, the overall volume of the expansion water tank is further effectively reduced, for example, the expansion water tank is miniaturized, the occupation of the installation space is reduced, and the transportation is convenient. The whole volume of the expansion water tank is smaller than 1/3 of the whole volume of the traditional expansion water tank, and when the water pressure in a heating system reaches 3bar, the volume of water entering the water cavity 30 is 2L-2.5L, so that the calibration requirement of the effective volume of the traditional 6L-8L expansion water tank can be met.

The housing 10 includes a first housing 12 and a second housing 13, the flexible member 20 is disposed between the first housing 12 and the second housing 13, the flexible member 20 and the first housing 12 cooperate to form a water chamber 30, and the water inlet 11 is disposed on the first housing 12. The flexible member 20 is further matched with the second housing 13 to enclose a movable cavity 40 with a variable space size, and the second housing 13 is provided with a pressure relief hole 17 communicated with the movable cavity 40. The drive mechanism 50 is provided on the second housing 13. When water in the heating system enters the water cavity 30 through the water inlet 11, the water cavity 30 expands and pushes the flexible member 20 to move towards the movable cavity 40 to compress the movable cavity 40, and air in the movable cavity 40 is discharged through the pressure relief hole 17.

Further, openings are formed in one sides of the first housing 12 and the second housing 13, the opening in the first housing 12 is communicated with the inner space of the first housing 12, the opening in the second housing 13 is communicated with the inner space of the second housing 13, and the side of the first housing 12 with the opening is connected with the side of the second housing 13 with the opening in a sealing mode.

Referring to fig. 2 and 3, specifically, the edge of the first shell 12 is provided with a first flange 14 folded outwards, the edge of the second shell 13 is provided with a second flange 15 folded outwards, the second flange 15 is fastened to the first flange 14 in a matching manner, and the edge of the flexible element 20 is sandwiched between the first flange 14 and the second flange 15.

Referring to fig. 1 again, a water inlet 16 is connected to the water inlet 11, and the water inlet 16 is disposed outside the housing 10. Specifically, the water inlet tap 16 is located outside the first housing 12 and welded to the first housing 12, and the water inlet tap 16 is used for a pipe connection of a heating system. Further, a connection thread is provided on the outer periphery of the water inlet nozzle 16, so that the water inlet nozzle 16 is threadedly sleeved with a pipe of a heating system through the connection thread.

The flexible member 20 includes a diaphragm 21, and a rim of the diaphragm 21 is sealingly connected to an inner circumferential side of the housing 10. Specifically, the edge of the diaphragm 21 is sandwiched between the first flange 14 and the second flange 15. The diaphragm 21 is a flexible film that can be deformed, and specifically, the diaphragm 21 is a rubber film.

In some embodiments, the flexible member 20 further includes a septum 22 that conforms to the septum 21. In particular, the diaphragm 22 abuts the side of the diaphragm 21 facing away from the water chamber 30. The edge of the partition plate 22 is spaced from the inner peripheral side of the housing 10, and it is understood that the cross section of the partition plate 22 is smaller than that of the diaphragm 21. The spacer 22 is a hard plate. The partition 22 is used to keep a portion of the diaphragm 21 flat, so that the diaphragm 21 can move in a predetermined direction under the driving of the driving mechanism 50, thereby effectively squeezing the water chamber 30 and enabling the water in the water chamber 30 to be timely and quickly discharged from the water inlet 11. When the separator 22 is located on the upper surface of the diaphragm 21, the separator 22 may be detachably attached to the diaphragm 21 or may be fixedly attached to the diaphragm 21.

Further, the edge of the partition 22 is provided with a ring piece 23 extending away from the diaphragm 21, the ring piece 23 is disposed around the center of the partition 22, the ring piece 23 is configured to prevent the partition 22 from being jammed in the gap 18 formed at the joint between the first casing 12 and the second casing 13 during the movement, and meanwhile, the ring piece 23 is also configured to prevent the edge of the partition 22 from scratching the diaphragm 21.

Further, the sum of the height H of the ring piece 23 and the thickness D of the partition plate 22 is greater than or equal to the width L of the gap 18 at the junction between the first casing 12 and the second casing 13. The joint between the ring piece 23 and the partition plate 22 is arc-shaped, and specifically, one surface of the joint between the ring piece 23 and the partition plate 22, which faces the diaphragm 21, is a convex arc surface, which is beneficial to preventing the joint between the ring piece 23 and the partition plate 22 from scratching the diaphragm 21.

Referring to fig. 1, the driving mechanism 50 includes a transmission assembly 51 and a driver 52 disposed on the housing 10 for driving the transmission assembly 51 to extend or contract, when the driving mechanism 50 drives the flexible member 20 to move along a predetermined direction, the transmission assembly 51 is connected to the flexible member 20, so that the driver 52 drives the flexible member 20 to move through the transmission assembly 51. Specifically, the transmission assembly 51 includes a telescopic rod 53 connected to the driver 52 and a pressing plate 54 connected to the telescopic rod 53, and the pressing plate 54 is detachably attached to a side of the flexible member 20 facing away from the water chamber 30. Further, the pressure plate 54 is detachably attached to a side of the separator 22 facing away from the diaphragm 21. Referring to fig. 2 and 4, the pressing plate 54 has a fastening sleeve 55 disposed on one end of the telescopic rod 53, the transmission assembly 51 further includes a bolt 56 and a nut 57, the bolt 56 penetrates the fastening sleeve 55 and the telescopic rod 53, and the nut 57 is screwed on one end of the bolt 56 to fix the fastening sleeve 55 on one end of the telescopic rod 53. The driver 52 is disposed on the second housing 13, specifically, the second housing 13 is provided with a through hole for the driver 52 to pass through, the driving mechanism 50 further includes a fixing plate 58 and a fastening member 59, the fixing plate 58 is located in the second housing 13 and is fixedly sleeved on the driver 52, and the fastening member 59 fixedly connects the fixing plate 58 with the first housing 12. Further, the fastener 59 is a screw. In the present embodiment, the driver 52 is a stepping motor. Of course, in other embodiments, the driver 52 may also be a pneumatic cylinder, a hydraulic cylinder, etc.

The expansion water tank further comprises a controller and a water pressure sensor, the controller is electrically connected with the driver 52 and the water pressure sensor, the water pressure sensor is used for detecting water pressure in a heating system of the wall-hanging stove and transmitting a pressure signal to the controller, and the controller controls the driver 52 to operate according to the pressure signal.

The production process of the expansion water tank comprises the following steps:

1. placing the diaphragm 21 over the opening of the first housing 12, the rim of the diaphragm 21 resting on the first flange 14;

2. placing a separator 22 on top of the membrane 21;

3. the drive mechanism 50 is mounted on the second housing 13.

4. And assembling the second shell 13 with the first shell 12, and matching and buckling a second flanging 15 on the second shell 13 with a first flanging 14 on the first shell 12.

The working principle of the expansion water tank is as follows:

1. referring to fig. 2, in the initial state, the actuator 52 extends the extension rod 53 according to a preset program, the pressing plate 54 presses against the partition 22, the partition 22 presses against the diaphragm 21, and the diaphragm 21 presses against the first housing 12, so that the water chamber 30 is in a fully contracted state.

2. After the water is supplemented to the heating system of the wall-mounted boiler, the water pressure in the heating system is about 1bar, and at the moment, the telescopic rod 53 is still in the extension state, namely, the water cavity 30 is still in the complete contraction state, so that the water in the heating system can not enter the water cavity 30 through the water inlet 11.

3. As shown in fig. 1, after the wall-mounted boiler is operated, in the process that the water pressure of the heating system is increased due to the temperature increase and the volume expansion of the water in the heating system, when the water pressure sensor detects that the water pressure in the heating system is higher than a preset value, the main controller controls the operation of the driver 52, the driver 52 drives the telescopic rod 53 to retract, the pressing plate 54 is far away from the partition plate 22, the water pressure of the heating system can push the flexible member 20, and therefore the excessive water in the heating system due to the volume expansion enters the water cavity 30 through the water inlet 11 to relieve the pressure of the heating system; during the process that water of the heating system enters the water chamber 30, the water chamber 30 is continuously expanded, thereby pushing the flexible member 20 to compress the movable chamber 40.

4. When the water pressure sensor detects that the water pressure in the heating system is lower than a preset value in the process of reducing the water pressure of the heating system due to the reduction of the temperature and the volume of water in the heating system, the main controller controls the driver 52 to operate, the driver 52 drives the telescopic rod 53 to extend, the pressing plate 54 is attached to the partition plate 22 and pushes the flexible piece 20 to compress the water cavity 30, and the water in the water cavity 30 flows back to the heating system through the water inlet 11, so that the pressure in the heating system is stabilized.

The utility model also provides a wall-mounted furnace which comprises the expansion water tank in any one of the embodiments.

Compared with the background technology, the wall-mounted furnace of the utility model has the following beneficial effects: need crowd the water of water cavity 30 back time in the heating system of hanging stove, start actuating mechanism 50, actuating mechanism 50 drives flexible 20 along predetermineeing the direction motion, make the space of water cavity 30 diminish, thereby extrude the water of water cavity 30 through water inlet 11, drive flexible 20 through actuating mechanism 50 and move, in the heating system of hanging stove is crowded back to the water of water cavity 30, effectively guarantee the stability of pressure among the heating system, and then effectively guarantee hanging stove can normal operating, need not to utilize the atmospheric pressure extrusion water cavity 30 of nitrogen gas, avoid leading to the problem that expansion tank became invalid because of nitrogen gas leakage, and then avoid hanging stove because of the not enough trouble that can't start that appears in water pressure.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. An expansion tank is characterized by comprising a shell (10), a flexible part (20) and a driving mechanism (50); the flexible part (20) is arranged in the shell (10), the flexible part (20) and the shell (10) are matched to enclose a water cavity (30) with a variable space size, and a water inlet (11) communicated with the water cavity (30) is formed in the shell (10); the driving mechanism (50) is arranged on the shell (10) and is used for driving the flexible part (20) to move along a preset direction so as to adjust the space size of the water cavity (30).

2. The expansion tank as claimed in claim 1, wherein said housing (10) comprises a first casing (12) and a second casing (13), said flexible member (20) is disposed between said first casing (12) and said second casing (13), and said flexible member (20) and said first casing (12) cooperate to enclose said water chamber (30), said water inlet (11) is disposed on said first casing (12), and said driving mechanism (50) is disposed on said second casing (13).

3. The expansion tank as claimed in claim 2, wherein said flexible member (20) and said second casing (13) are cooperated to enclose a movable chamber (40) with a variable size, and said second casing (13) is provided with a pressure relief hole (17) communicating with said movable chamber (40).

4. The expansion tank as claimed in claim 2, characterized in that the first shell (12) is provided at its edge with a first flange (14) which is turned over outwards, the second shell (13) is provided at its edge with a second flange (15) which is turned over outwards, the second flange (15) is in fit fastening with the first flange (14), and the edge of the flexible member (20) is clamped between the first flange (14) and the second flange (15).

5. Expansion tank according to claim 1, characterized in that the flexible element (20) comprises a membrane (21), the edge of the membrane (21) being sealingly connected with the inner circumferential side of the housing (10).

6. The expansion tank as claimed in claim 5, wherein said flexible member (20) further comprises a partition plate (22) attached to said diaphragm (21), and a rim of said partition plate (22) is spaced from an inner circumferential side of said casing (10).

7. Expansion tank according to claim 6, characterized in that the edge of the partition (22) is provided with a ring (23) extending away from the membrane (21).

8. The expansion tank as claimed in claim 6, wherein the driving mechanism (50) comprises a transmission assembly (51) and a driver (52) disposed on the housing (10) for driving the transmission assembly (51) to extend or contract, the transmission assembly (51) being connected to the partition (22) when the driving mechanism (50) drives the flexible member (20) to move along the predetermined direction.

9. The expansion tank as claimed in claim 8, characterized in that the transmission assembly (51) comprises a telescopic rod (53) connected to the drive (52) and a pressure plate (54) connected to the telescopic rod (53), the pressure plate (54) being detachably attached to the side of the flexible member (20) facing away from the water chamber (30).

10. A wall hanging stove comprising an expansion tank as claimed in any one of claims 1 to 9.

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