An inner motor valve with pressure balance function for intelligent gas meter

Abstract

The application belongs to the technical field of motor valves, and discloses an intelligent gas meter built-in motor valve with pressure balance function, which comprises a valve body, a gear box and a motor, the valve body is fixedly connected with the gear box through a valve cover, the motor is arranged beside the gear box, a gear set is arranged in the gear box, the gear set input end is in transmission connection with the motor output end, a screw rod and a nut are arranged in the valve body respectively, the screw rod is in threaded connection with the nut, and the gear set output end drives the screw rod to rotate. The intelligent gas meter built-in motor valve with pressure balance function provided by the application can push the valve core to move away from the valve cover under the action of the pressure difference between the inside and outside of the gear box, so that the valve hole and the valve core are separated to form a gap, the inside and outside of the gear box can be connected, the pressure inside and outside the gear box is balanced, and the sealing bag will not be locked with the nut due to the pressure difference.

Description

Technical Field

[0001] This invention belongs to the field of motor valve technology, and specifically relates to a built-in motor valve for a smart gas meter with pressure balancing function. Background Technology

[0002] Smart gas meters typically use an electric motor valve as the actuator to control the opening and closing of the gas meter. Currently, the common structure of a built-in electric motor valve in a smart gas meter mainly includes a valve body, valve seat, valve cover, motor, reduction gear set, screw, and sealing cover. The valve body is fixedly connected to the valve seat via the valve cover. The motor and reduction gear set are correspondingly installed inside the valve seat. The top end of the screw is driven by a nut to the sealing cover, and the bottom end of the screw passes through the valve cover and is driven by the reduction gear set. The top of the valve body has a valve port corresponding to the sealing cover. During operation, the motor drives the screw to rotate through the reduction gear set, which in turn drives the sealing cover to move axially along the screw, thereby controlling the opening and closing of the valve port. See also, for example, Chinese Patent (Announcement No. CN201339750Y) which discloses an electric motor valve for a gas meter.

[0003] The drawback of existing smart gas valves in gas meters is that testing the gas meter requires pressurizing or evacuating the meter to test its sealing performance. Figure 1 In the prior art, the sealing bladder 2' on the motor valve is installed on the valve cover 3', and the lip at the end of the sealing bladder 2' is sealed to the outer periphery of the nut 1'. In order to ensure that the nut 1' can move normally, the wall thickness at the lip of the sealing bladder 2' is usually thin. Therefore, there is an air cavity between the sealing bladder 2' and the valve cover 3'. After vacuuming, the air pressure in the gearbox, motor box, and the air cavity between the sealing bladder 2' and the valve cover 3' is lower than the air pressure inside the gas meter. Therefore, due to the pressure difference, the lip of the sealing bladder 2' is pressed tightly by the air pressure, causing the nut 1' to be locked by the sealing bladder 2', which prevents the nut from moving normally, and thus causes the motor valve to malfunction.

[0004] Therefore, it is necessary to improve the existing technology. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems. This invention provides a built-in motor valve for a smart gas meter with pressure balancing function. It has the advantages of balancing the pressure difference between the inside of the gearbox and sealing valve and the inside of the gas meter, and the sealing cover will not fall off, thus improving the sealing effect of the motor valve.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a valve body, a gearbox, and a motor are included. The valve body is fixedly connected to the gearbox via a valve cover. The motor is located beside the gearbox. A gear set is provided inside the gearbox. The input end of the gear set is connected to the output end of the motor. A screw and a nut are respectively provided inside the valve body. The screw and the nut are threadedly connected. The output end of the gear set is connected to the screw. A sealing bladder is provided around the nut. One end of the sealing bladder is sealed to the valve cover, and the other end of the sealing bladder forms a lip that seals to the outer end face of the nut. A one-way valve is provided on the gearbox. The input end of the one-way valve is connected to the outside of the gearbox, and the output end of the one-way valve is connected to the inside of the gearbox. When the pressure difference between the inside and outside of the gearbox is greater than the set pressure of the one-way valve, the one-way valve opens, allowing the outside of the gearbox to connect to the inside of the gearbox through the one-way valve.

[0007] Preferably, the nut is connected to a sealing cover assembly that seals with the valve port of the valve body. The sealing cover assembly includes a piston portion connected to one end of the nut near the valve port. A fixing plate is fixedly connected to the piston portion, and a sealing gasket is pressed between the piston portion and the fixing plate. The sealing gasket seals with the valve port.

[0008] Preferably, the gearbox is provided with a valve port, and the one-way valve includes a valve core and a return spring. The valve core is movably disposed in the valve port, and the return spring is abutted between the gearbox and the valve core. The return spring causes the valve core to always have a tendency to block the valve port. When the pressure difference between the inside and outside of the gearbox is greater than the elastic force of the return spring, the valve core overcomes the elastic force of the return spring and moves relative to the gearbox, thereby opening the valve port.

[0009] Preferably, the gearbox is provided with a protrusion, the protrusion forms the valve hole, the valve core is a platform, and the cross-sectional area of ​​the valve core near the return spring is smaller than the cross-sectional area of ​​the valve core away from the return spring, and the hole wall of the valve hole is a conical surface adapted to the valve core.

[0010] Preferably, a wire clip is installed on the side wall of the valve cover.

[0011] Preferably, the wire card is provided with a card slot.

[0012] Preferably, the gear set includes a drive bevel gear and a driven bevel gear, the drive bevel gear being drivenly connected to the output shaft of the motor, and the drive bevel gear and the driven bevel gear being meshed together.

[0013] Preferably, the end of the screw located inside the gearbox is provided with a lug, and the driven bevel gear is provided with a boss that cooperates with the lug.

[0014] Preferably, a motor housing is provided on the side of the gearbox, and a motor cover is fixedly connected to the motor housing. The motor cover is provided with a buckle, and the motor housing is provided with a latch that cooperates with the buckle.

[0015] Preferably, the fixing plate is made of a rigid material.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a built-in motor valve for a smart gas meter with pressure balancing function. Under the action of the pressure difference between the inside and outside of the gearbox, the valve core is pushed to move away from the valve cover. As a result, the valve hole and the valve core are separated and a gap is created, so that the inside and outside of the gearbox can be connected, thereby balancing the pressure inside and outside of the gearbox. Therefore, the sealing bag will not lock the nut due to the pressure difference. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the existing technology; Figure 2 This is a three-dimensional structural diagram of the entire invention; Figure 3 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 4 This is a schematic cross-sectional view of the sealing bladder of the present invention; Figure 5 This is a three-dimensional structural schematic diagram of the sealing cap assembly of the present invention; Figure 6 This is a cross-sectional structural diagram of the sealing cap assembly of the present invention.

[0018] Figure descriptions: 1', Nut; 2', Sealing bladder; 3', Valve cover; 1, Valve body; 11, Valve port; 2, Gearbox; 21, Protrusion; 3, Motor; 4, Check valve; 41, Valve core; 42, Return spring; 5, Valve cover; 51, Cable clamp; 511, Slot; 52, Annular groove; 53, Sleeve; 6, Screw; 61, Lug; 62, Boss; 7, Nut; 71, Piston; 711, Protruding rod; 72, Sealing gasket; 73, Fixing plate; 8, Sealing bladder; 9, Motor housing; 91, Motor cover; 10, Drive bevel gear; 12, Driven bevel gear; 13, Sealing ring. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 2-6As shown, the present invention discloses a built-in motor valve for a smart gas meter with pressure balancing function, comprising a valve body 1, a gearbox 2, and a motor 3. The valve body 1 is fixedly connected to the gearbox 2 via a valve cover 5. In this embodiment, the valve body 1, gearbox 2, and valve cover 5 are provided with corresponding mounting holes. A fixed connection is achieved by installing bolts in the mounting holes, thereby making the installation more secure. Besides bolts, the connection between the valve body 1, gearbox 2, and valve cover 5 can also be achieved using pin connections or snap-fit ​​connections, or any other connection method that can achieve a fixed connection between the valve body 1, gearbox 2, and valve cover 5. The motor 3 is located beside the gearbox 2; specifically, a motor housing 9 is located beside the gearbox 2, and the motor 3 is housed within the motor housing 9. Gearbox 2 and motor box 9 are integrally molded, thus reducing assembly steps and improving production efficiency. Motor box 9 is fixedly connected to motor cover 91, which has a buckle. Motor box 9 has a locking slot that mates with the buckle. Motor box 9 and motor cover 91 are connected via this locking slot, improving assembly efficiency and reducing the number of parts required for assembly, thus lowering costs. Gearbox 2 contains a gear set, with its input end connected to the output end of motor 3. Valve body 1 contains a screw 6 and a nut 7, threaded together. The output end of the gear set drives the screw 6 to rotate. Gearbox 2 is equipped with a one-way valve 4 for balancing internal and external pressure differences. The input end of one-way valve 4 is connected to the gearbox 2. The gearbox 2 is connected to the outside world, and the output end of the one-way valve 4 is connected to the inside of the gearbox 2. When the pressure difference between the inside and outside of the gearbox 2 is greater than the set pressure of the one-way valve 4, the one-way valve 4 opens, allowing the outside of the gearbox 2 to communicate with the inside of the gearbox 2 through the one-way valve 4. The nut 7 is connected to a sealing cover assembly that seals with the valve port 11 of the valve body 1. The sealing cover assembly includes a piston part 71, which is connected to the end of the nut 7 near the valve port. A fixing plate 73 is fixedly connected to the piston part 71. The fixing plate 73 is made of a rigid material, which is plastic in this embodiment. In addition to plastic, it can also be aluminum alloy or other rigid materials. The fixing plate 73 is provided with several fixing posts, which are four in this embodiment. The piston part 71 is provided with a fixing post that is connected to the valve port 11 of the valve body 1. The fixing port that matches the fixing post has a corresponding through hole on the sealing gasket 72. The fixing post on the fixing plate 73 passes through the through hole on the sealing gasket 72 and is connected to the fixing port on the piston part 71 by interference fit. A sealing gasket 72 is provided between the piston part 71 and the fixing plate 73. The two ends of the sealing gasket 72 abut against the piston part 71 and the fixing plate 73 respectively. The sealing gasket 72 is fixed by using the piston part 71 and the fixing plate 73. The sealing gasket 72H is sealed with the valve port 11, which can achieve the sealing effect when the motor valve is closed, and can also completely prevent the sealing cover from being filled with gas and causing bulging and disengagement. The valve body 1 is provided with a valve port 11, and the bottom of the sealing gasket 72 is sealed with the valve port 11.

[0021] In this embodiment, the gearbox 2 is provided with a protrusion 21, and the one-way valve 4 is installed in the valve hole. The protrusion 21 is located outside the gearbox 2. Specifically, in this embodiment, the protrusion 21 is located at the center of the end face of the gearbox 2 away from the valve cover 5. In addition to being located at this location, the protrusion 21 can also be located at any position on the outer end face of the gearbox 2. The protrusion 21 forms a valve hole. The one-way valve 4 includes a valve core 41 and a return spring 42. The valve core 41 is movably disposed in the valve hole, and the return spring 42 abuts against the gearbox 2 and the valve core 41. The return spring 42 makes the valve core 41 always have the tendency to block the valve hole. When the pressure difference between the inside and outside of the gearbox 2 is greater than the return spring 42, the valve core 41 will be blocked. When the spring 42 is under tension, the valve core 41 overcomes the tension of the return spring 42 and moves relative to the gearbox 2, thereby opening the valve orifice. The valve core 41 is a frustum. In this embodiment, the valve core 41 is a frustum of a cylinder. In addition to a frustum of a cylinder, the valve core 41 can also be a truncated pyramid. The cross-sectional area of ​​the valve core 41 near the return spring 42 is smaller than the cross-sectional area of ​​the valve core 41 away from the return spring 42. The wall of the valve orifice is a conical surface that fits the valve core 41. The cross-sectional area of ​​the valve orifice near the valve cover 5 is also smaller than the cross-sectional area away from the valve cover 5. When the return spring 42 is not under tension, the side wall of the valve core 41 is tightly fitted with the inner wall of the valve orifice, so that the gearbox 2 is in a sealed state.

[0022] In this embodiment, two symmetrical wire clips 51 are installed on the side wall of the valve cover 5. The connecting wires on the motor valve can be clipped into the wire clips 51. Preferably, the wire clips 51 can also be provided with slots 511. The connecting wires on the motor valve can be placed into the slots 511, which makes the wiring of the motor valve more convenient and also prevents the connecting wires from interfering with other components in the pressure gauge.

[0023] In this embodiment, the gear set includes a drive bevel gear 10 and a driven bevel gear 12. The drive bevel gear 10 is connected to the output shaft of the motor 3. The drive bevel gear 10 and the driven bevel gear 12 are meshed together. The end of the screw 6 located in the gearbox 2 is provided with a lug 61. The driven bevel gear 12 is provided with a boss 121 that cooperates with the lug 61.

[0024] In this embodiment, a sealing bladder 8 is provided around the outer periphery of the nut 7. One end of the sealing bladder 8 is sealed to the valve cover 5, and the other end of the sealing bladder 8 forms a lip that is sealed to the outer end face of the nut 7. This prevents the gas in the valve body 1 from entering the gearbox 2, ensuring safe use. Preferably, in order to improve the positional accuracy of the sealing bladder 8, a recessed annular groove 52 is formed on the upper part of the valve cover 5. The end of the sealing bladder 8 is inserted into the annular groove 52, making the installation of the sealing bladder 8 more stable. Furthermore, since the one-way valve 4 can balance the pressure difference inside and outside the gearbox 2, the sealing bladder 8 will not seize the nut 7. Therefore, the wall thickness at the opening of the sealing bladder 8 can be made thinner, improving the elasticity of the sealing bladder 8 and reducing its rigidity. This makes the installation of the sealing bladder 8 easier and faster.

[0025] In this embodiment, the nut 7 is a column extending along the axial direction of the screw 6. In order to prevent the nut 7 from shaking when moving along the axial direction of the screw 6, a guide sleeve 53 extends axially from the upper end face of the valve cover 5. The guide sleeve 53 is sleeved between the nut 7 and the sealing bladder 8. Specifically, the inner wall of the sealing bladder 8 and the outer wall of the guide sleeve 53 are sealed together to improve the sealing effect.

[0026] In this embodiment, there is only one lug 61 and one boss 121. By using a transmission structure consisting of a single lug 61 and a single boss 121 between the driven bevel gear 12 and the screw 6, the angle of the motor 3's no-load rotation during startup is increased (close to 360°). When the boss 121 of the driven bevel gear 12 contacts the lug 61 of the screw 6, the impact force is greater and the power output effect is better.

[0027] In this embodiment, a sealing ring 13 is installed on the outer periphery of the valve body 11.

[0028] When the gas meter is tested for sealing, the gas pressure inside the gearbox 2 will be greater than that inside the gas meter when the gas meter is evacuated. Therefore, under the action of the gas pressure, the valve core 41 will be pushed to the side away from the valve cover 5. As a result, the valve hole and the valve core 41 will lose contact and form a gap. The gap formed allows the inside and outside of the gearbox 2 to be connected, thereby balancing the pressure inside and outside the gearbox 2. Therefore, the sealing bag 8 will not lock the nut 7 due to the pressure difference.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A built-in motor valve for a smart gas meter with pressure balancing function, comprising a valve body (1), a gearbox (2), and a motor (3), wherein the valve body (1) is fixedly connected to the gearbox (2) via a valve cover (5), the motor (3) is disposed beside the gearbox (2), a gear set is provided inside the gearbox (2), the input end of the gear set is drivenly connected to the output end of the motor (3), a screw (6) and a nut (7) are respectively provided inside the valve body (1), the screw (6) and the nut (7) are threadedly connected, the output end of the gear set is drivenly connected to the screw (6), and a sealing bladder (8) is provided around the nut (7), characterized in that: One end of the sealing bladder (8) is sealed to the valve cover (5), and the other end of the sealing bladder (8) forms a lip that is sealed to the outer end face of the nut (7). A one-way valve (4) is provided on the gearbox (2). The input end of the one-way valve (4) is connected to the outside of the gearbox (2), and the output end of the one-way valve (4) is connected to the inside of the gearbox (2). When the pressure difference between the inside and outside of the gearbox (2) is greater than the set pressure of the one-way valve (4), the one-way valve (4) opens, so that the outside of the gearbox (2) is connected to the inside of the gearbox (2) through the one-way valve (4).

2. The built-in motor valve for an intelligent gas meter with pressure balancing function according to claim 1, characterized in that: The nut (7) is connected to a sealing cover assembly that seals with the valve port (11) of the valve body (1). The sealing cover assembly includes a piston part (71), which is connected to the end of the nut (7) near the valve port. A fixing plate (73) is fixedly connected to the piston part (71). A sealing gasket (72) is pressed between the piston part (71) and the fixing plate (73). The sealing gasket (72) seals with the valve port (11).

3. The built-in motor valve for an intelligent gas meter with pressure balancing function according to claim 2, characterized in that: The gearbox (2) is provided with a valve hole. The one-way valve (4) includes a valve core (41) and a return spring (42). The valve core (41) is movably disposed in the valve hole. The return spring (42) abuts against the gearbox (2) and the valve core (41). The return spring (42) makes the valve core (41) always have the tendency to block the valve hole. When the pressure difference between the inside and outside of the gearbox (2) is greater than the elastic force of the return spring (42), the valve core (41) overcomes the elastic force of the return spring (42) and moves relative to the gearbox (2), thereby opening the valve hole.

4. The built-in motor valve for an intelligent gas meter with pressure balancing function according to claim 3, characterized in that: The gearbox (2) is provided with a protrusion (21), the protrusion (21) forms the valve hole, the valve core (41) is a platform, and the cross-sectional area of ​​the valve core (41) near the return spring (42) is smaller than the cross-sectional area of ​​the valve core (41) away from the return spring (42), and the hole wall of the valve hole is a conical surface adapted to the valve core (41).

5. The built-in motor valve for an intelligent gas meter with pressure balancing function according to claim 1, characterized in that: A wire clip (51) is installed on the side wall of the valve cover (5).

6. The built-in motor valve for an intelligent gas meter with pressure balancing function according to claim 5, characterized in that: The line card (51) is provided with a card slot (511).

7. A built-in motor valve for a smart gas meter with pressure balancing function according to claim 1 or 3, characterized in that: The gear set includes a drive bevel gear (10) and a driven bevel gear (12). The drive bevel gear (10) is connected to the output shaft of the motor (3) and the drive bevel gear (10) and the driven bevel gear (12) are meshed together.

8. The built-in motor valve for a smart gas meter with pressure balancing function according to claim 7, characterized in that: The end of the screw (6) located inside the gearbox (2) is provided with a lug (61), and the driven bevel gear (12) is provided with a boss (121) that cooperates with the lug (61).

9. The built-in motor valve for a smart gas meter with pressure balancing function according to claim 1, characterized in that: The gearbox (2) is provided with a motor box (9) on the side. The motor box (9) is fixedly connected with a motor cover (91). The motor cover (91) is provided with a buckle. The motor box (9) is provided with a buckle that cooperates with the buckle.

10. The built-in motor valve for a smart gas meter with pressure balancing function according to claim 2, characterized in that: The fixing plate (73) is made of rigid material.

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