CN107560678B - Temperature conversion device and gas meter - Google Patents
Temperature conversion device and gas meter Download PDFInfo
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- CN107560678B CN107560678B CN201710831551.6A CN201710831551A CN107560678B CN 107560678 B CN107560678 B CN 107560678B CN 201710831551 A CN201710831551 A CN 201710831551A CN 107560678 B CN107560678 B CN 107560678B
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Abstract
The invention discloses a temperature conversion device and a gas meter, and relates to the field of gas meters. The invention provides a temperature conversion device which comprises a wheel disc, a crank, a connecting rod, a crank guiding device and a thermosensitive element, wherein a first chute is formed in the wheel disc, a second chute is formed in the crank guiding device, the crank penetrates through the first chute and the second chute, the crank can slide along the first chute and the second chute, the thermosensitive element is fixedly connected to the wheel disc, the thermosensitive element is connected to the crank guiding device and is used for deforming according to the change of temperature and driving the crank guiding device to move, the crank abuts against the inner peripheral walls of the first chute and the second chute, an included angle is formed between the extending direction of the first chute and the extending direction of the second chute, and the included angle is smaller than 90 degrees and larger than 45 degrees. The invention also provides a gas meter, which adopts the temperature conversion device. The temperature conversion device and the gas meter provided by the invention can ensure the metering accuracy and stability of the gas meter.
Description
Technical Field
The invention relates to the field of gas meters, in particular to a temperature conversion device and a gas meter.
Background
At present, the domestic temperature conversion gas meter mainly achieves the purpose of changing the rotation volume by changing the crank radius of the central wheel so as to realize temperature conversion. The acting direction of the radius force of the driving crank is consistent with the deformation direction of the bimetal thermosensitive element, and the crank shaft on the central wheel receives the reaction force of the connecting rod when the gas meter runs due to the insufficient rigidity of the bimetal thermosensitive element.
Disclosure of Invention
The invention aims to provide a temperature conversion device which can ensure the metering accuracy and stability of a gas meter.
Another object of the present invention is to provide a gas meter which can ensure metering accuracy and stability.
The invention provides a technical scheme that:
the utility model provides a temperature conversion device, includes rim plate, crank, connecting rod, crank guider and thermistor, first spout has been seted up on the rim plate, second spout has been seted up on the crank guider, the crank pass first spout with the second spout and respectively with the rim plate with crank guider is connected, the crank can be followed first spout with the second spout slides, thermistor fixed connection in the rim plate, and thermistor connect in crank guider, thermistor is used for producing deformation and drives according to the change of temperature crank guider follows the width direction of first spout removes, and makes the crank support in first spout with the inner peripheral wall of second spout, the extending direction of first spout with form the contained angle between the extending direction of second spout, the contained angle is less than 90 and is greater than 45.
Further, one end of the first sliding groove is provided with a first mounting groove, the width of the first mounting groove is larger than that of the first sliding groove, and the first mounting groove is used for enabling the crank to pass through.
Further, one end of the second sliding groove is provided with a second mounting groove, the width of the second mounting groove is larger than that of the second sliding groove, and the second mounting groove is used for enabling the crank to pass through.
Further, a plurality of guide pieces are arranged on the wheel disc, the guide pieces jointly form a guide slideway extending along the width direction of the first chute, and the crank guide device is arranged in the guide slideway.
Further, the guide piece comprises a guide block and a limiting block, one end of the guide block is fixedly connected to the wheel disc, a plurality of guide blocks jointly form the guide slide way, the limiting block is fixedly connected to the other end of the guide block, and the limiting block located on one side of the guide slide way extends towards the guide block located on the other side of the guide slide way.
Further, the crank guiding device comprises a guiding device body and a connecting part, the second sliding groove is formed in the guiding device body, the guiding device body extends along the width direction of the first sliding groove, the connecting part is fixedly connected to one end of the guiding device body, and the connecting part is connected to the thermosensitive element.
Further, a through hole is formed in the connecting portion, the through hole penetrates through the connecting portion and extends towards the wheel disc, a clamping groove is further formed in the connecting portion, the clamping groove penetrates through the peripheral wall of the through hole, and the thermosensitive element is connected with the connecting portion through the clamping groove.
Further, the thermosensitive element comprises an elastic part and a linkage part, the elastic part is connected with the wheel disc, one end of the linkage part is connected with the elastic part, the other end of the linkage part extends into the through hole through the clamping groove, and Zhou Bika of the clamping groove is held on the linkage part.
Further, a limiting piece is arranged on the crank, and the diameter of the limiting piece is larger than the width of the first sliding groove and the width of the second sliding groove.
A gas meter includes a temperature conversion device. The temperature conversion device comprises a wheel disc, a crank, a connecting rod, a crank guiding device and a thermosensitive element, wherein a first sliding groove is formed in the wheel disc, a second sliding groove is formed in the crank guiding device, the crank penetrates through the first sliding groove and the second sliding groove and is respectively connected with the wheel disc and the crank guiding device, the crank can slide along the first sliding groove and the second sliding groove, the thermosensitive element is fixedly connected with the wheel disc, and is connected with the crank guiding device, the thermosensitive element is used for generating deformation according to temperature change and driving the crank guiding device to move along the width direction of the first sliding groove, the crank is enabled to abut against the inner peripheral wall of the first sliding groove and the inner peripheral wall of the second sliding groove, an included angle is formed between the extending direction of the first sliding groove and the extending direction of the second sliding groove, and the included angle is smaller than 90 degrees and larger than 45 degrees.
Compared with the prior art, the temperature conversion device and the gas meter provided by the invention have the beneficial effects that:
according to the temperature conversion device and the gas meter, the crank guiding device is arranged, the second sliding groove is formed in the crank guiding device, the first sliding groove is formed in the wheel disc, the crank stretches into the first sliding groove and the second sliding groove, the crank guiding device is driven to move along the width direction of the first sliding groove through deformation caused by temperature change received by the heat-sensitive element, so that the crank is propped against the inner peripheral walls of the first sliding groove and the second sliding groove and slides along the first sliding groove and the second sliding groove, the radius of the crank is changed, at the moment, the connecting rod connected with the crank has a reaction force on the crank, so that the crank exerts force on the inner peripheral walls of the first sliding groove and the second sliding groove, and because an included angle formed between the first sliding groove and the second sliding groove is smaller than 90 degrees and larger than 45 degrees, the force transmitted to the movement direction of the crank guiding device by the reaction force of the connecting rod through the inner peripheral walls of the first sliding groove and the second sliding groove is greatly reduced, the force transmitted to the heat-sensitive element is greatly reduced, the change of the radius of the crank caused by the reaction force of the connecting rod to the heat-sensitive element is prevented from being larger than the force required by deformation of the heat-sensitive element, and the measuring accuracy and the gas meter are prevented from being influenced.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. Other relevant drawings may be made by those of ordinary skill in the art without undue burden from these drawings.
FIG. 1 is a schematic diagram of a first view of a gas meter according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of the reaction force of a connecting rod to a crank and the force transferred to a heat sensitive element provided by an embodiment of the present invention;
FIG. 3 is a schematic view of a second view angle structure of a gas meter according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a wheel disc according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a crank guiding device according to an embodiment of the present invention.
Icon: 10-a gas meter; 11-temperature conversion means; 12-pointer; 100-wheel disc; 110-a first chute; 120-a first mounting groove; 130-a guide; 131-guide channel; 132-guide blocks; 133-limiting blocks; 200-crank guide; 210-a guide body; 211-a second chute; 212-a second mounting slot; 220-connecting part; 221-a through hole; 222-a clamping groove; 300-crank; 310-limiting piece; 400-a thermosensitive element; 410-an elastic part; 420-linkage.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships conventionally put in place when the inventive product is used, or the directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, terms such as "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The following describes specific embodiments of the present invention in detail with reference to the drawings.
Examples
Referring to fig. 1, the present embodiment provides a gas meter 10, which can ensure the metering accuracy and stability of the gas meter 10. The gas meter 10 comprises a temperature conversion device 11 and a pointer 12, the pointer 12 is connected with the temperature conversion device 11, the temperature conversion device 11 is used for always keeping the metering error in a certain range in a certain working temperature range, and the metering error at different temperatures is corrected to be near the metering error at the reference temperature, namely the metering accuracy and the metering stability of the gas meter 10 are ensured.
The temperature conversion device 11 includes a wheel 100, a crank guide 200, a crank 300, a heat sensitive element 400, and a connecting rod (not shown). The thermosensitive element 400 is fixedly connected to the wheel 100, and the thermosensitive element 400 is connected to the crank guide 200, the crank 300 is connected to the crank guide 200 and the wheel 100, and one end of the connecting rod is connected to the crank 300. The thermal element 400 can deform according to the change of temperature and drive the crank guiding device 200 to move, the crank guiding device 200 can drive the crank 300 to move relative to the wheel disc 100, and the radius of the crank can be changed, so that the purpose of changing the revolution volume is achieved by changing the radius of the crank, and the effect of correcting the metering error is achieved.
Further, referring to fig. 2 to 5 in combination, the wheel disc 100 is provided with a first sliding groove 110, the crank guiding device 200 is provided with a second sliding groove 211, the crank 300 passes through the first sliding groove 110 and the second sliding groove 211 and is respectively connected with the wheel disc 100 and the crank guiding device 200, and the crank 300 can slide along the first sliding groove 110 and the second sliding groove 211. The heat-sensitive element 400 deforms according to the change of temperature and makes the crank 300 abut against the inner peripheral walls of the first sliding chute 110 and the second sliding chute 211, and further drives the crank guiding device 200 to move along the width direction of the first sliding chute 110 so that the crank 300 slides along the first sliding chute 110 and the second sliding chute 211. Wherein, an included angle is formed between the extending direction of the first sliding groove 110 and the extending direction of the second sliding groove 211, and the included angle is smaller than 90 ° and larger than 45 °. So that the reaction force of the connecting rod to the crank 300 is transmitted to the crank guiding device 200 through the inner peripheral wall of the first chute 110 and the inner peripheral wall of the second chute 211 and simultaneously transmitted to the thermosensitive element 400 is greatly reduced, the change of the crank radius caused by the force of the connecting rod, which is required by the deformation of the thermosensitive element 400 and is caused by the force of the connecting rod, which is transmitted to the thermosensitive element 400 by the reaction force of the connecting rod to the crank 300, can be effectively avoided, and the influence on the metering precision and the stability of the gas meter 10 is avoided.
In the present embodiment, the crank guide 200 is driven by the heat sensitive element 400 to move along a direction perpendicular to the extending direction of the first sliding groove 110, so that the first sliding groove 110 and the second sliding groove 211 relatively move, and the position where the first sliding groove 110 and the second sliding groove 211 intersect changes, and the crank 300 passing through the first sliding groove 110 and the second sliding groove 211 moves along with the position where the first sliding groove 110 and the second sliding groove 211 intersect, so as to realize the change of the crank radius. Wherein the direction of the reaction force of the connecting rod to the crank 300 is along the extending direction of the first sliding groove 110, the direction of the force transmitted to the thermosensitive element 400 is perpendicular to the direction of the reaction force of the connecting rod to the crank 300, namely the relationship between the reaction force of the connecting rod to the crank 300 and the force transmitted to the thermosensitive element 400 is as shown in fig. 2, F in fig. 2 1 Refer to the reaction force of the connecting rod to the crank 300, F 2 Refer to F 1 The force transmitted to the thermosensitive element 400, where α is the complementary angle of the included angle formed between the extending direction of the first sliding groove 110 and the extending direction of the second sliding groove 211. Wherein F is 2 ＝F 1 tan alpha, i.e. F, is greater than 0 deg. and less than 45 deg. due to the angle between the first runner 110 and the second runner 211 being greater than 45 deg. and less than 90 deg 2 Less than F 1 Thus link pairThe force transmitted from the reaction force of the crank 300 to the thermosensitive element 400 is also greatly reduced. It is ensured that the thermosensitive element 400 does not generate excessive deformation, and the metering accuracy and stability of the gas meter 10 are ensured. That is, only the thermosensitive element 400 can drive the crank 300 to change the crank radius, and the crank 300 cannot drive the thermosensitive element 400 to change by the reaction force provided by the connecting rod.
Referring to fig. 2, in the present embodiment, in order to ensure that the crank 300 does not separate from the first sliding groove 110 and the second sliding groove 211 when sliding in the first sliding groove 110 and the second sliding groove 211, a limiting member 310 is disposed on the crank 300, and the diameter of the limiting member 310 is larger than the widths of the first sliding groove 110 and the second sliding groove 211, so as to ensure that the crank 300 does not separate from the first sliding groove 110 and the second sliding groove 211 due to the limiting effect of the limiting member 310 when the crank 300 slides in the first sliding groove 110 and the second sliding groove 211.
Referring to fig. 4, in addition, one end of the first sliding groove 110 is further provided with a first mounting groove 120, the width of the first mounting groove 120 is greater than that of the first sliding groove 110, and the first mounting groove 120 is used for the crank 300 to pass through. And, the first mounting groove 120 can be penetrated by the stopper 310. When the crank 300 needs to be inserted into the first sliding groove 110, the crank 300 only needs to be inserted through the first mounting groove 120 so that the limiting member 310 passes through the first mounting groove 120, and then the crank 300 is slid into the first sliding groove 110.
Referring to fig. 5, in the same way, one end of the second sliding groove 211 is further provided with a second mounting groove 212, the width of the second mounting groove 212 is greater than the width of the second sliding groove 211, and the second mounting groove 212 is used for the crank 300 to pass through. And, the second mounting groove 212 can be penetrated by the stopper 310. When the crank 300 is required to be inserted into the second sliding slot 211, the crank 300 is required to be inserted into the first mounting slot 120 through the second mounting slot 212, so that the stopper 310 is inserted into the second sliding slot 211, and then the crank 300 is slid into the second sliding slot 211.
Referring to fig. 2 and 4 in combination, in addition, a plurality of guide members 130 are further disposed on the wheel disc 100, the plurality of guide members 130 together form a guide channel 131 extending along the width direction of the first chute 110, and the crank guiding device 200 is disposed inside the guide channel 131. Wherein the guide channel 131 is used forEnsure that the crank guiding device 200 can always keep moving along the width direction of the first chute 110, ensure F 1 And F 2 The relation between the two components is not changed all the time, and the metering accuracy and stability of the gas meter 10 are further ensured.
In the present embodiment, the guide channel 131 is perpendicular to the first sliding groove 110, so that the guide channel 131 can always maintain the crank guiding device 200 in a form that can move in a direction perpendicular to the first sliding groove 110. To ensure the metering accuracy and stability of the gas meter 10.
Further, the guide 130 includes a guide block 132 and a stopper 133, wherein one end of the guide block 132 is fixedly connected to the wheel disc 100, and the guide blocks 132 together form a guide channel 131. The limiting block 133 is fixedly connected to the other end of the guide block 132, and the limiting block 133 located at one side of the guide channel 131 extends toward the guide block 132 located at the other side of the guide channel 131. The limiting block 133 is used for limiting the movement of the crank guiding device 200 when moving and separating from the guiding channel 131, so as to avoid the failure of the temperature conversion device 11 caused by the separation of the crank guiding device 200 from the guiding channel 131, avoid the failure of the gas meter 10, and prolong the service life of the gas meter 10.
In the present embodiment, the number of the guide members 130 is four, wherein two guide members 130 are disposed at intervals on one side of the first chute 110, the other two guide members 130 are disposed on the other side of the first chute 110, and the four guide members 130 enclose a rectangle. In addition, two stoppers 133 located at the same side of the first chute 110 extend toward each other, respectively. It should be appreciated that in other embodiments, the stop block 133 may extend toward the guide block 132 diagonally opposite the rectangle.
Referring to fig. 2 and 5 in combination, the crank guiding device 200 includes a guiding device body 210 and a connecting portion 220, wherein a second sliding slot 211 is formed on the guiding device body 210. The guide body 210 extends in the width direction of the first chute 110, the connection portion 220 is fixedly connected to one end of the guide body 210, and the thermosensitive element 400 is connected to the connection portion 220. The thermosensitive element 400 drives the guide device body 210 to move through the connecting part 220 to drive the crank 300 to slide in the first sliding groove 110 and the second sliding groove 211, so as to complete the adjustment of the crank radius.
In the present embodiment, the extending direction of the guide body 210 is perpendicular to the first chute 110, so that the guide body 210 realizes that the guide body 210 can move in the direction perpendicular to the first chute 110.
The connection part 220 is provided with a through hole 221, the through hole 221 penetrates the connection part 220 and extends towards the wheel disc 100, the connection part 220 is also provided with a clamping groove 222, the clamping groove 222 penetrates the peripheral wall of the through hole 221, and the thermosensitive element 400 is connected with the connection part 220 through the clamping groove 222.
In addition, the thermosensitive element 400 includes an elastic portion 410 and a linkage portion 420, the elastic portion 410 is connected to the wheel disc 100, one end of the linkage portion 420 is connected to the elastic portion 410, the other end of the linkage portion 420 extends into the through hole 221, and the Zhou Bika of the slot 222 is held by the linkage portion 420, so that the linkage portion 420 can drive the crank guiding device 200 to move under the driving of the elastic portion 410.
Referring to fig. 2, in the present embodiment, the thermosensitive element 400 is a bimetal thermosensitive element, and the elastic portion 410 and the linkage portion 420 are integrally formed. In the present embodiment, the elastic portion 410 is spiral, and the central portion of the elastic portion 410 is fixed to the wheel disc 100, and the linking portion 420 is connected to the end of the elastic portion 410. When the temperature changes, the elastic portion 410 deforms to move the linkage portion 420, and the linkage portion 420 drives the crank guiding device 200. The linkage part 420 is driven by the elastic part 410 to generate a part of circular motion track, and at this time, the linkage part 420 can slide relative to the clamping groove 222, so that the motion of the part generated by the linkage part 420 perpendicular to the crank guiding device 200 is not transferred to the crank guiding device 200, and the crank guiding device 200 is ensured to be always maintained in a form of moving perpendicular to the first chute 110, so as to avoid affecting the movement of the crank guiding device 200. The crank guiding device 200 can be moved to an accurate position, and the metering accuracy and stability of the gas meter 10 are further ensured.
The gas meter 10 provided in this embodiment is matched with the first sliding groove 110 formed on the wheel disc 100 and the second sliding groove 211 formed on the crank guiding device 200, so that the crank 300 penetrating into the first sliding groove 110 and the second sliding groove 211 can slide along the first sliding groove 110 and the second sliding groove 211 at the same time to change the crank radius according to the change of temperature, and an included angle larger than 45 ° and smaller than 90 ° is formed between the extending direction of the first sliding groove 110 and the extending direction of the second sliding groove 211, so that the force of the reaction force of the connecting rod to the crank 300 transmitted to the thermosensitive element 400 through the inner peripheral walls of the first sliding groove 110 and the second sliding groove 211 is greatly reduced, the force of the reaction force of the connecting rod to the crank 300 transmitted to the thermosensitive element 400 is smaller than the force required by the thermosensitive element 400 to generate deformation, and insufficient for generating redundant deformation of the thermosensitive element 400, and the metering accuracy and stability of the gas meter 10 are ensured. The plurality of guide members 130 ensure that the crank guide 200 can always maintain the moving state perpendicular to the direction of the first chute 110, and further ensure the metering accuracy and stability of the gas meter 10.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The temperature conversion device is characterized by comprising a wheel disc, a crank, a connecting rod, a crank guiding device and a thermosensitive element, wherein a first chute is formed in the wheel disc, a second chute is formed in the crank guiding device, the crank penetrates through the first chute and the second chute and is respectively connected with the wheel disc and the crank guiding device, the crank can slide along the first chute and the second chute, the thermosensitive element is fixedly connected with the wheel disc, and is connected with the crank guiding device, the thermosensitive element is used for generating deformation according to temperature change and enabling the crank to abut against the inner peripheral walls of the first chute and the second chute, and can drive the crank guiding device to move along the width direction of the first chute, an included angle is formed between the extending direction of the first chute and the extending direction of the second chute, and the included angle is smaller than 90 degrees and larger than 45 degrees; the thermosensitive element adopts a bimetal thermosensitive element.
2. The temperature conversion device according to claim 1, wherein one end of the first slide groove is provided with a first mounting groove, a width of the first mounting groove is larger than a width of the first slide groove, and the first mounting groove is used for the crank to pass through.
3. The temperature conversion device according to claim 1, wherein one end of the second slide groove is provided with a second mounting groove, a width of the second mounting groove being larger than a width of the second slide groove, the second mounting groove being for the crank to pass through.
4. The temperature conversion device according to claim 1, wherein a plurality of guide members are provided on the wheel disc, the plurality of guide members together form a guide slide extending in the first slide groove width direction, and the crank guide is provided in the guide slide.
5. The temperature conversion device according to claim 4, wherein the guide member comprises a guide block and a stopper, one end of the guide block is fixedly connected to the wheel disc, a plurality of the guide blocks together form the guide slide, the stopper is fixedly connected to the other end of the guide block, and the stopper located at one side of the guide slide extends toward the guide block located at the other side of the guide slide.
6. The temperature conversion device according to claim 1, wherein the crank guide includes a guide body and a connecting portion, the second chute is opened on the guide body, the guide body extends in a width direction of the first chute, the connecting portion is fixedly connected to one end of the guide body, and the connecting portion is connected to the thermosensitive element.
7. The temperature conversion device according to claim 6, wherein the connection portion is provided with a through hole penetrating the connection portion and extending toward the wheel disc, the connection portion is further provided with a clamping groove penetrating a peripheral wall of the through hole, and the heat sensitive element is connected to the connection portion through the clamping groove.
8. The temperature conversion device according to claim 7, wherein the thermosensitive element includes an elastic portion connected to the wheel plate and a linking portion having one end connected to the elastic portion, the other end of the linking portion extending into the through hole through the clamping groove, and Zhou Bika of the clamping groove being held to the linking portion.
9. The temperature conversion device according to claim 1, wherein a stopper is provided on the crank, and a diameter of the stopper is larger than a width of the first chute and the second chute.
10. A gas meter comprising a temperature conversion device according to any one of claims 1 to 9.
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| CN201710831551.6A CN107560678B (en) | 2017-09-15 | 2017-09-15 | Temperature conversion device and gas meter |
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| CN201710831551.6A CN107560678B (en) | 2017-09-15 | 2017-09-15 | Temperature conversion device and gas meter |
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| CN107560678B true CN107560678B (en) | 2023-06-16 |
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