CN217762264U - Gas control valve and gas meter - Google Patents

Abstract

Provided are a gas control valve and a gas meter including the same. The gas control valve includes a housing, a switching member, and a drive mechanism. The housing includes an air flow channel extending in a first direction and having an inlet channel and an outlet channel. The switch member is translatable in a second horizontal direction perpendicular to the first vertical direction to switch between the first position and the second position. In the first position, the switch member is positioned between the inlet channel and the outlet channel to close the gas control valve, and in the second position, the switch member is away from between the inlet channel and the outlet channel to open the gas control valve. The drive mechanism is configured to drive the switch member to translate in the second horizontal direction.

Description

Gas control valve and gas meter

Technical Field

Embodiments of the present disclosure relate to gas control valves and gas meters.

Background

A gas metering apparatus such as a gas meter measures a flow rate of gas using ultrasonic waves, a mechanical runner, or the like. Such a gas metering device may be provided with a valve for shutting off the gas.

There is a need for a gas control valve that has low pressure loss, is small, is easy to assemble, and is highly safe.

SUMMERY OF THE UTILITY MODEL

At least one embodiment of the present disclosure provides a gas control valve including a housing, a switching member, and a drive mechanism. The housing includes an airflow channel extending in a first direction and having an inlet channel and an outlet channel. The switch member is translatable in a second horizontal direction perpendicular to the first vertical direction to switch between the first position and the second position. In the first position, the switch member is positioned between the inlet channel and the outlet channel to close the gas control valve, and in the second position, the switch member is away from between the inlet channel and the outlet channel to open the gas control valve. The drive mechanism is configured to drive the switch member to translate in the second horizontal direction.

For example, in some embodiments, the gas control valve further comprises a gas sensor. The gas sensor is configured to sense one or more gas parameters of the gas at the intake passage.

For example, in some embodiments, the gas sensor comprises a temperature pressure sensor and the one or more gas parameters comprise a temperature and a pressure of the gas.

For example, in some embodiments, the housing includes a first half housing, a second half housing, and a cover. The first and second housing halves form a housing chamber housing the drive mechanism and the switch member. An air outlet channel is formed in the second half shell. The air intake passage is formed in the first half case and the cover. The gas control valve further includes a sealing member disposed in the receiving recess of the first housing half and covered by the cover such that a central aperture of the sealing member is aligned with the gas passage. The gas sensor is disposed in a mounting groove of the cover body, the mounting groove being formed in an outer surface of the cover body facing away from the sealing member, and a sensing portion of the gas sensor communicates with the gas intake passage through a communication hole in the cover body.

For example, in some embodiments, the housing further includes a cover sheet that covers the gas sensor to secure the gas sensor to the cover.

For example, in some embodiments, the mounting groove is provided with a positioning post therein, and the gas sensor and the cover plate are provided with a positioning hole for matching with the positioning post.

For example, in some embodiments, the sensing portion protrudes to be inserted into the communication hole, and the shape of the sensing portion matches the shape of the opening of the communication hole.

For example, in some embodiments, the communication aperture includes a first aperture portion and a second aperture portion extending in a first vertical direction. The sensing portion protrudes to be inserted into the first hole portion of the communication hole, and the shape of the sensing portion matches the shape of the first hole portion of the communication hole. The second hole portion is connected to the first hole portion, and the second hole portion is configured to open to the intake passage and to be offset from the first hole portion along a horizontal plane perpendicular to the first vertical direction.

For example, in some embodiments, the drive mechanism comprises: a motor; a lead screw extending in a first horizontal direction and driven to rotate by a motor; and the threaded sleeve is in threaded connection with the lead screw. The lead screw is configured to translate the threaded sleeve in a second horizontal direction by rotating. The threaded sleeve is configured to be connected to the switch member to move the switch member in a second horizontal direction. The switch member includes a first connection portion protruding in a third horizontal direction perpendicular to the first vertical direction and the second horizontal direction to be connected to a second connection portion of the screw boss.

For example, in some embodiments, the first connection portion includes a first rectangular wall, a second rectangular wall, and a first rectangular recess in the second horizontal direction between the first rectangular wall and the second rectangular wall, and the second connection portion includes a second rectangular recess, a third rectangular recess, and a third rectangular wall in the second horizontal direction between the second rectangular recess and the third rectangular recess. The first connecting portion is connected to the second connecting portion such that the first rectangular wall is received in the second rectangular recess, the second rectangular wall is received in the third rectangular recess, and the third rectangular wall is received in the first rectangular recess.

For example, in some embodiments, the drive member further comprises a motor housing, a bellows, a first connector, and a second connector. The motor is arranged in the motor shell, the lead screw extends out of the motor shell from the motor, and the corrugated pipe is arranged around the lead screw. One end of the bellows is connected to the motor housing by a first connector, and the other end of the bellows is connected to the threaded sleeve by a second connector.

For example, in some embodiments, the bellows has a first flange portion and a second flange portion, the first connector is snapped to the motor housing to sandwich the first flange portion between the motor housing and the first connector, and the second connector is snapped to the threaded sleeve to sandwich the second flange portion between the threaded sleeve and the second connector.

At least one embodiment of this disclosure is a gas meter including the gas control valve as described above.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present disclosure and therefore should not be considered as limiting the scope of protection, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

FIG. 1 illustrates a perspective view of a gas control valve according to an embodiment of the present disclosure;

2A-2D illustrate front, rear, side and bottom views, respectively, of the gas control valve shown in FIG. 1;

FIG. 3 illustrates an exploded perspective view of the gas control valve shown in FIG. 1;

FIG. 4 illustrates an exploded perspective view of the seal member, cover, gas sensor and cover plate of the gas control valve shown in FIG. 1;

FIGS. 5A and 5B show a perspective view and a top view, respectively, of the cover shown in FIG. 1;

FIGS. 5C and 5D show cross-sectional views taken along lines B-B and A-A of FIG. 5B, respectively;

FIG. 5E shows an enlarged view of the circled portion in FIG. 5D;

FIG. 6A shows a cross-sectional view of the gas control valve of FIG. 1 installed in a gas meter case at a communication hole;

FIG. 6B shows an enlarged view of the dashed box portion of FIG. 6A;

FIG. 7 illustrates an exploded perspective view of the switching member of the gas control valve shown in FIG. 1;

FIG. 8 illustrates a perspective view of a bellows of the gas control valve shown in FIG. 1;

FIG. 9 illustrates a perspective view of a first connector of the gas control valve shown in FIG. 1; and is

Fig. 10 shows a perspective view of a second connection of the gas control valve shown in fig. 1.

List of reference numerals

First housing half 111 sealing surfaces 134, 1221

Receiving recess 1111 gas sensor 140

Second housing half 112 sensing portion 141

Cover 113 motor housing 151

Radial flange 1131 snap groove 1511

Mounting groove 1132 motor 152

Communicating aperture 1133 drive assembly 153

First bore portion 11331 lead screw 154

Second bore portion 11332 threaded sleeve 155

Positioning post 1134 and second rectangular groove 1551

Third rectangular groove 1552 of cover plate 114

Third rectangular wall 1553 of intake passage 115

Bearing 156 of air outlet channel 116

Bellows 157 of base 121

First rectangular wall 1211 first flange part 1571

Second rectangular wall 1212 and second flange 1572

First rectangular groove 1213 first connector 158

First lug 1581 of sealing plate 122

The sealing member 130 first projection 1582

First annular portion 131 and second connector 159

Second annular portion 132 second ledge 1591

Central orifice 133 snap-fit opening 1592

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and the like in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item preceding the word covers the element or item listed after the word and its equivalents, without excluding other elements or items. "upper", "lower", "vertical", "horizontal", etc. are used merely to indicate a relative positional relationship, which may also change accordingly when the absolute positional relationship of the objects being described changes.

Fig. 1 illustratesbase:Sub>A perspective view ofbase:Sub>A gas control valve according to an embodiment of the present disclosure, fig. 2A to 2D illustrate front, rear, side and bottom views, respectively, of the gas control valve illustrated in fig. 1, fig. 3 illustrates an exploded perspective view of the gas control valve illustrated in fig. 1, fig. 4 illustratesbase:Sub>A perspective view ofbase:Sub>A sealing member 130,base:Sub>A cover 113,base:Sub>A gas sensor 140 andbase:Sub>A cover plate 114 of the gas control valve illustrated in fig. 1, fig. 5A and 5B illustratebase:Sub>A perspective view andbase:Sub>A top view, respectively, of the cover 113 illustrated in fig. 1, fig. 5C and 5D illustrate cross-sectional views taken along lines B-B andbase:Sub>A-base:Sub>A of fig. 5B, fig. 5E illustrates an enlarged view ofbase:Sub>A circled portion in fig. 5D, fig. 6base:Sub>A illustratesbase:Sub>A cross-sectional view at 1133 after the gas control valve illustrated in fig. 1 is mounted inbase:Sub>A watch case, fig. 6B illustrates an enlarged view ofbase:Sub>A dashed-frame portion of fig. 6base:Sub>A, and fig. 7 illustratesbase:Sub>A perspective view of an opening and closing member of the gas control valve illustrated in fig. 1.

As shown in fig. 3, here, a "first vertical direction" (denoted by "Z"), a "second horizontal direction" (denoted by "X") perpendicular to the first vertical direction Z, and a "third horizontal direction" (denoted by "Y") perpendicular to the first vertical direction Z and the second horizontal direction X are defined.

As shown in fig. 1 to 7, the gas control valve includes a housing, an opening and closing member, a driving mechanism, a sealing member 130, and a gas sensor 140. The housing includes a first housing half 111 (herein, also referred to as "upper housing"), a second housing half 112 (herein, also referred to as "lower housing"), and a cover 113. The first and second case halves 111 and 112 are joined by fasteners such as screws to form a receiving chamber in which the switching member, the driving mechanism, and the sealing member 130 can be received. The cover 113 is joined to the first case half 111 by a fastener such as a screw. Furthermore, the housing comprises an air flow channel extending in the first vertical direction Z. An air flow channel is formed through the housing and has an inlet channel 115 and an outlet channel 116. An inlet air passage 115 is formed through the cover 113 and the first half case 111, and an outlet air passage 116 is formed through the second half case 112. Accordingly, gas, such as gas, may enter the receiving space from the inlet channel 115 and exit from the outlet channel 116. The inlet channel 115 and the outlet channel 116 are each a cylindrical channel extending in the first vertical direction Z, which are arranged coaxially with each other.

As shown in fig. 3 and 7, the opening and closing member includes a base 121 and a closing plate 122 provided on the base 121. The switch member is driven by the drive mechanism to move between the first position and the second position in the second horizontal direction X. In the first position, the switching member is located between inlet channel 115 and outlet channel 116 to close the gas control valve. In the second position, the switch member leaves between inlet channel 115 and outlet channel 116 to open the gas control valve.

Since the gas flow channel extends in the first vertical direction Z, the switching member moves in the first horizontal direction perpendicular to the first vertical direction Z to shut off the gas flow channel, i.e., to shut off the flow of gas from the gas inlet channel 115 to the gas outlet channel 116. Therefore, the flow of the gas does not need to change direction, and the pressure loss of the gas is reduced.

The sealing member 130 includes first and second annular portions 131, 132, the first annular portion 131 extending radially from the second annular portion 132, and a central aperture 133 extending through the first and second annular portions 131, 132. The upper case 111 is provided with an accommodation groove 1111 around the intake passage 115. Cover 113 has a radial flange 1131 surrounding intake channel 115. The first annular portion 131 of the sealing member 130 is received in the receiving recess 1111 and covered by the radial flange 1131 of the cover 113 such that the first annular portion 131 is sandwiched between the bottom wall of the receiving recess 1111 and the radial flange 1131 of the cover 113 and such that the central aperture 133 of the sealing member 130 is aligned with the gas flow passage for the gas to flow through. A second annular portion 132 of the sealing member 130 extends toward the outlet passage 116. When the opening and closing member is moved to the first position, i.e., between the inlet passage 115 and the outlet passage 116, the sealing member 130 is pressed by the cover plate 122 of the opening and closing member, thereby sealing the air flow passage.

Specifically, the sealing surfaces 134, 1221 of the sealing member 130 and the opening and closing member facing each other are disposed obliquely with respect to the plane in which the second horizontal direction X and the third horizontal direction Y lie. Specifically, the sealing surface 134 of the sealing member 130 and the sealing surface 1221 of the opening and closing member are gradually inclined toward the air outlet passage 116 in a direction from the second position to the first position. Accordingly, when the light opening member moves from the second position to the first position to shut off the air flow channel, the switching member may gradually wedge into a space between the air inlet channel 115 and the air outlet channel 116, thereby pressing against the sealing member 130. Since the switching member is switched from the second position to the first position in a wedging manner, it is ensured that the switching member smoothly enters the first position and is reliably pressed against the sealing member 130 to achieve complete closing of the gas control valve.

The gas sensor 140 is configured to sense one or more gas parameters of the gas at the intake passage 115. As shown in fig. 3-6B, gas sensor 140 is disposed in a mounting groove 1132 formed in an outer surface of a radial flange 1131 of cap 113 that faces away from seal member 130. The cover 113 also has a communication hole 1133 having one end disposed in the mounting groove 1132 to be opened to the sensing portion 141 of the gas sensor 140 and the other end extended to the inner surface of the radial flange 1131 facing the sealing member 130 to communicate with the gas intake passage 115. The sensing portion 141 of the gas sensor 140 is in gas communication with the gas inlet channel 115 through the communication hole 1133 to sense gas parameters of the gas such as temperature and pressure. In the present embodiment, the communication hole 1133 extends in a bent manner, rather than in a straight line, which helps prevent leakage of gas. Specifically, the communication hole 1133 includes a first hole portion 11331 extending in the first vertical direction Z and a second hole portion 11332 extending in the first vertical direction Z and connected to the first hole portion. The sensing part 141 protrudes to be inserted into the first hole portion 11331 of the communication hole 1133, and the shape of the sensing part 141 is matched with the shape of the first hole portion 11331 of the communication hole 1133 to avoid leakage of gas. The second hole portion 11332 is configured to open to an inner surface of the radial flange 1131 facing the seal member 130 to communicate with the intake passage 115. In order to extend the communication hole 1133 while being bent, the second hole portion 11332 is offset from the first hole portion 11331 along a horizontal plane perpendicular to the first vertical direction. Further, the gas sensor 140 may be covered with the cover sheet 114 to fix the gas sensor 140 to the cover 113. In the present embodiment, the positioning pillars 1134 are disposed in the mounting groove 1132, and the gas sensor 140 and the cover sheet 114 are disposed with positioning holes matched with the positioning pillars 1134. In this way, the gas sensor 140 and the cover sheet 114 can be conveniently positioned and held.

For example, the gas sensor 140 may be a pressure sensor. For example, the gas control valve may be provided in a housing of the gas meter such that a gas inlet passage of the gas control valve communicates with a gas inlet of the housing. When the gas meter is disassembled (e.g., in the event of abnormal operation), the sensing portion 141 of the gas sensor 140 will lose pressure. When the gas sensor 140 senses this loss of pressure, the gas meter may be instructed to be removed or retrofitted. For example, the gas sensor 140 may be a temperature and pressure sensor. Since the pressure and temperature of the gas are related to each other, the pressure and temperature of the gas at the sensing part 141 can be sensed at the same time. By analyzing both the temperature and the pressure of the gas, it can be more accurately determined whether the gas meter is disassembled and retrofitted.

The drive mechanism includes a motor housing 151, a motor 152, a transmission assembly 153, a lead screw 154, and a threaded sleeve 155. The motor 152 drives the lead screw 154 for rotation via the transmission assembly 153. The transmission assembly 153 includes, for example, a reduction gear set. The lead screw 154 extends in the second horizontal direction X and is supported by a bearing 156. The motor 152, the transmission assembly 153, and the bearing 156 are disposed in the motor housing 151, and the lead screw 154 extends from inside the motor housing 151 to the outside of the motor housing 151 to be threadedly coupled with the threaded sleeve 155. The threaded sleeve 155 is connected to the base 121 of the switching member. Thereby, the motor 152 drives the switching member via the transmission assembly 153, the lead screw 154 and the threaded sleeve 155 to extend in the second horizontal direction X. Since the threaded sleeve 155 is connected to the base 121, the threaded sleeve 155 is restricted to move only in the second horizontal direction X and cannot rotate about the lead screw 154. Thus, the rotation of the lead screw 154 is converted into a translation of the threaded sleeve 155 in the second horizontal direction X.

Specifically, the base 121 of the switching member includes a first connection portion protruding in the third horizontal direction Y, which is connected to a second connection portion of the screw boss 155. Thus, the switch member and the screw housing 155 are connected in the third horizontal direction Y perpendicular to the second horizontal direction X. Therefore, the size of the gas control valve in the second horizontal direction X is reduced. Since the motor 152 extends a large distance in the third horizontal direction Y, the size of the gas control valve in the third horizontal direction Y is not significantly increased while the size of the gas control valve in the second horizontal direction X is reduced.

Specifically, the first connection portion includes a first rectangular wall 1211, a second rectangular wall 1212, a first rectangular groove 1213 between the first and second rectangular walls in the second horizontal direction X, and the second connection portion includes a second rectangular groove 1551, a third rectangular groove 1552, and a third rectangular wall 1553 between the second and third rectangular grooves 1551 and 1552 in the second horizontal direction X. The first connection portion is connected with the second connection portion such that the first rectangular wall 1211 is received in the second rectangular recess 1551, the second rectangular wall 1212 is received in the third rectangular recess 1552, and the third rectangular wall 1213 is received in the first rectangular recess 1553. The first and second connection portions facilitate a reliable connection and a simple assembly of the base 121 with the threaded sleeve 155.

Further, the driving mechanism further includes a bellows 157, a first connector 158, and a second connector 159. Fig. 8 illustrates a perspective view of a bellows of the gas control valve shown in fig. 1, fig. 9 illustrates a perspective view of a first connection member of the gas control valve shown in fig. 1, and fig. 10 illustrates a perspective view of a second connection member of the gas control valve shown in fig. 1. As shown in fig. 3 and 8 to 10, a bellows 157 is disposed around the lead screw 154 such that one end thereof is connected to the motor housing 151 through a first connector 158 and the other end thereof is connected to the threaded sleeve 155 through a second connector 159. Specifically, the bellows 157 has a first flange portion 1571 and a second flange portion 1572, the first connector 158 is snapped to the motor housing 151 to sandwich the first flange portion 1571 between the motor housing 151 and the first connector 158, and the second connector 159 is snapped to the threaded sleeve 155 to sandwich the second flange portion 1572 between the threaded sleeve 155 and the second connector 159. The first connector 158 has a first disc-shaped body and at least two (e.g., two, three, or more) first lugs 1581 each having a first projection 1582 that projects radially inward. The motor housing 151 has a cylindrical portion in which a bearing 156 carrying a lead screw 154 can be accommodated. A catching groove 1511 corresponding to the first projection 1582 is provided on an outer surface of the cylindrical portion. The first projection 1582 of the first connector 158 is snapped into the snap groove 1511 so that the first flange portion 1571 of the bellows 157 is fixed between the cylindrical portion and the first disc-shaped body. The second connector 159 has a second disc-shaped body and at least two (e.g., two, three, or more) second lugs 1591, each second lug 1591 having a snap opening 1592 disposed therein. A catching protrusion 1554 corresponding to the catching opening 1592 is provided on an outer surface of the screw housing 155. The snap projection 1554 of the threaded sleeve 155 snaps into the snap interface 1592 such that the second flange portion 1572 of the bellows 157 is captured between the threaded sleeve 155 and the second disc-shaped body. The bellows 157 is connected between the motor housing 151 and the threaded sleeve 155 by the first and second connectors 158 and 159, so that the assembly of the bellows 157 is more convenient and reliable.

The scope of the present disclosure is not defined by the embodiments described above but is defined by the appended claims and equivalents thereof.

Claims (12)

1. A gas control valve, comprising:

a housing including an airflow channel extending in a first direction and having an inlet channel and an outlet channel;

a switch member translatable in a second horizontal direction perpendicular to the first vertical direction to switch between a first position in which the switch member is positioned between an inlet channel and an outlet channel to close the gas control valve and a second position in which the switch member is clear of the inlet channel and the outlet channel to open the gas control valve; and

a drive mechanism configured to drive the switch member to translate in a second horizontal direction.

2. The gas control valve of claim 1, further comprising:

a gas sensor configured to sense one or more gas parameters of the gas at the intake passage.

3. The gas control valve of claim 2,

the gas sensor comprises a temperature and pressure sensor and the one or more gas parameters comprise a temperature and a pressure of the gas.

4. The gas control valve of claim 2,

the housing includes a first half housing, a second half housing, and a cover, the first half housing and the second half housing forming a housing chamber housing the driving mechanism and the switching member, the air outlet passage being formed in the second half housing, the air inlet passage being formed in the first half housing and the cover,

the gas control valve further includes a sealing member disposed in the receiving groove of the first case half and covered by the cover such that a central orifice of the sealing member is aligned with the gas passage,

the gas sensor is disposed in a mounting groove of the cover body, the mounting groove being formed in an outer surface of the cover body facing away from the sealing member, and a sensing portion of the gas sensor communicates with the gas intake passage through a communication hole in the cover body.

5. The gas control valve of claim 4,

the housing further includes a cover sheet covering the gas sensor to secure the gas sensor to the cover body.

6. The gas control valve of claim 5,

and a positioning column is arranged in the mounting groove, and the gas sensor and the cover plate are provided with positioning holes matched with the positioning column.

7. The gas control valve of claim 4,

the sensing portion protrudes to be inserted into the communication hole, and the shape of the sensing portion matches the shape of the opening of the communication hole.

8. The gas control valve of claim 4,

the communication hole includes a first hole portion and a second hole portion extending in a first vertical direction,

the sensing portion protrudes to be inserted into the first hole portion of the communication hole, and a shape of the sensing portion matches a shape of the first hole portion of the communication hole,

the second bore portion is connected to the first bore portion,

the second hole portion is configured to open to the intake passage and to be offset from the first hole portion along a horizontal plane perpendicular to the first vertical direction.

9. The gas control valve of claim 1,

the drive mechanism includes:

a motor;

a lead screw extending in a first horizontal direction and driven to rotate by the motor;

a threaded sleeve threadedly coupled to a lead screw, the lead screw configured to translate the threaded sleeve in a second horizontal direction by rotation, the threaded sleeve configured to couple to a switch member to move the switch member in a second horizontal direction,

wherein the switch member includes a first connection part protruding in a third horizontal direction perpendicular to the first vertical direction and the second horizontal direction to be connected to a second connection part of the screw boss.

10. The gas control valve of claim 9,

the first connection portion includes a first rectangular wall, a second rectangular wall, and a first rectangular recess between the first rectangular wall and the second rectangular wall in the second horizontal direction, the second connection portion includes a second rectangular recess, a third rectangular recess, and a third rectangular wall between the second rectangular recess and the third rectangular recess in the second horizontal direction,

the first connecting portion is connected to the second connecting portion such that the first rectangular wall is received in the second rectangular recess, the second rectangular wall is received in the third rectangular recess, and the third rectangular wall is received in the first rectangular recess.

11. The gas control valve of claim 9,

the driving mechanism also comprises a motor shell, a corrugated pipe, a first connecting piece and a second connecting piece,

the motor is arranged in the motor shell, the lead screw extends out of the motor shell from the motor, the corrugated pipe is arranged around the lead screw, one end of the corrugated pipe is connected to the motor shell through a first connecting piece, the other end of the corrugated pipe is connected to the threaded sleeve through a second connecting piece,

the bellows has a first flange portion and a second flange portion, a first connector snap-coupled to the motor housing to sandwich the first flange portion between the motor housing and the first connector, and a second connector snap-coupled to the threaded sleeve to sandwich the second flange portion between the threaded sleeve and the second connector.

12. A gas meter comprising a gas control valve according to any one of claims 1 to 11.

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