Flow valve for combustion engine

Abstract

The utility model discloses a flow valve for a combustion engine. The flow valve comprises a stepping motor, a magnetic linkage device, a planetary reducer, a flow adjusting device, a lateral connecting base, a planetary shell, an air inlet connecting shell and an air outlet connecting shell. Magnetic fields generated by the outer magnetic ring wheel and the inner magnetic ring wheel correspond to each other in position and are coaxial; the planetary shell is fixed on the lateral connecting seat; the lateral connecting seat is fixed in a lateral connecting opening in the air inlet connecting shell; the planetary reducer is in transmission connection with the flow adjusting device through a transmission connecting rod in the planetary reducer. The flow adjusting device is installed in the air inlet connecting shell. And the air inlet connecting shell and the air outlet connecting shell are fixed together. The flow valve for the combustion engine has the functions of no leakage, high flow regulation precision, slow opening, sensitive regulation action, no spark, no internal leakage after full closing and the like.

Description

Technical Field

[0001] The utility model relates to a flow valve, in particular to a flow valve for a combustion machine. Background Art

[0002] The flow valve for burners is a valve widely used in the field of gas and oil. It controls the size of the fire by adjusting the flow rate.

[0003] The main actuators of the flow valves for burners on the market are mainly composed of simple servo motors and controllers. Among them, the simple servo motor is mainly composed of a DC motor and an angle sensor with low accuracy. This kind of actuator has the following problems:

[0004] 1. The flow control accuracy is not high, which is not conducive to saving natural gas, diesel and other resources;

[0005] 2. Since the motor is a DC motor, it will generate a large stall current when it reaches the specified limit point. As the number of stalls increases, the power management chip in the controller will burn out. At the same time, since the DC motor is a brushed motor, during the rotation process, the commutator and the carbon brush are always igniting, and the ignition current exceeds 20mA (below 20mA is a safe current). If there is a gas or fuel leak in the natural gas or fuel pipeline, it may cause a fire or explosion.

[0006] The connection structure between the actuator and the valve body of the flow valve is that the DC motor is connected to the ball rod in the valve body through a simple gear reducer. The sealing structure of this connection is a dynamic seal, that is, a sealing ring is inserted into the ball rod and then embedded in the valve body. In order to prevent air leakage or liquid leakage, the seal fit is a tight overfit. This fit mode. Causes the mechanical transmission to wear quickly, which will further cause air leakage or liquid leakage; at the same time, it will further increase the load current generated by the motor operation and reduce the service life of the controller.

[0007] The flow regulating device of the flow valve is composed of a ball rod and a valve port. The flow valve is radially sealed in the fully closed state. This sealing method cannot achieve full closure without flow. In order to ensure stable ignition and no gas or liquid leakage, a slow-opening solenoid valve is added between the flow valve (slow-opening solenoid valve: by controlling the starting speed of the valve core, the solenoid valve is slowly opened, thereby accurately controlling the fluid flow). The slow-opening solenoid valve is expensive, which undoubtedly increases the user's cost. Utility Model Content

[0008] The utility model aims to overcome the above-mentioned deficiencies of the prior art and provides a flow valve for a burner.

[0009] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a flow valve for a burner, comprising a stepping motor, a magnetic linkage device, a planetary reducer, a flow regulating device, a lateral connecting seat, a planetary housing, an air inlet connecting housing, and an air outlet connecting housing;

[0010] The magnetic linkage device includes an outer magnetic ring wheel and an inner magnetic ring wheel in the planetary reducer; the magnetic fields generated by the first magnetic ring of the outer magnetic ring wheel and the second magnetic ring of the inner magnetic ring wheel correspond to each other and are coaxial;

[0011] Wherein, the output shaft of the stepper motor is coaxially connected with the outer magnetic ring wheel;

[0012] Wherein, the planetary reducer is installed in the planetary housing; the planetary housing is fixed on the lateral connecting seat;

[0013] Wherein, the lateral connection seat is fixed to the lateral connection port on the air inlet connection housing;

[0014] Wherein, the planetary reducer is transmission-connected with the flow regulating device through a transmission connecting rod in the planetary reducer;

[0015] Wherein, the flow regulating device is installed in the air inlet connection housing;

[0016] Wherein, the air inlet connecting shell and the air outlet connecting shell are fixed.

[0017] In the above-mentioned flow valve for a combustion machine, the planetary reducer further includes an inner gear ring, a primary planet carrier, a secondary planet carrier, a plurality of planetary gears, a central shaft, and a transmission connecting rod;

[0018] In the above-mentioned flow valve for a combustion engine, the planetary gears are respectively installed on the primary planetary carrier and the secondary planetary carrier; the primary planetary carrier and the secondary planetary carrier are transmission-connected with the inner gear ring through the planetary gears; the inner gear ring is fixed on the inner wall of the planetary housing; the driving sun gear of the inner magnetic ring wheel is transmission-connected with the primary planetary carrier through the planetary gears, and the secondary connection port of the secondary planetary carrier is transmission-connected with the transmission connecting rod;

[0019] In the above-mentioned flow valve for a combustion machine, a first axial hole matching the central axis is provided at the center of the second magnetic ring, the second magnetic ring is connected to the driving sun gear on the same axis, and the first axial hole penetrates the driving sun gear;

[0020] In the above-mentioned flow valve for a combustion machine, a primary planetary disc of the primary planetary carrier is provided with a plurality of primary gear shafts matched with the planetary gears, a primary sun hole matched with the central axis is provided at the center of the primary planetary disc, a primary sun wheel is provided below the primary planetary disc, the primary sun wheel is coaxial with the primary sun hole, and the primary sun hole runs through the primary sun wheel, and the primary sun wheel is meshed with the planetary gears of the secondary planetary carrier;

[0021] In the above-mentioned flow valve for a combustion machine, a plurality of secondary gear shafts matching the planetary gears are provided on the secondary planetary disc of the secondary planetary carrier, a secondary crotch stop portion is provided below the secondary planetary disc, and the secondary connection port is provided at the center of the secondary planetary disc and the secondary crotch stop portion;

[0022] In the above-mentioned flow valve for a combustion machine, the inner gear ring includes an inner gear that matches the planetary gear, and a planetary stop portion is provided above the inner gear to prevent the planetary gear from detaching from the inner gear ring.

[0023] In the above-mentioned flow valve for a burner, the transmission connecting rod includes a guide rod, which is provided with a bead groove and a connector adapted to the secondary connection port in sequence, and a small steel ball is arranged in the bead groove; the secondary crotch stop portion is provided to prevent the small steel ball from falling out of the bead groove;

[0024] In the above-mentioned flow valve for a burner, a primary transmission gear is provided below the guide rod; the primary transmission gear is transmission-connected to the flow regulating device;

[0025] In the above-mentioned flow valve for a burner, a second axial hole matching the central axis is provided at the center of the guide rod, and the second axial hole passes through the connecting head and the bead groove in sequence.

[0026] In the above-mentioned flow valve for a burner, a bead inlet is provided on the side of the connecting head, and the bead inlet is communicated with the bead groove.

[0027] In the above-mentioned flow valve for a burner, the lateral connecting seat includes a guide sleeve matching the guide rod, a steel ball raceway is formed on the guide sleeve, and a welding positioning step matching the planetary shell is formed on the outside of the steel ball raceway; the steel ball raceway, the ball groove, the secondary crotch stop, and the small steel balls form a bearing, so that the radial and axial clearances of the transmission connecting rod can be controlled.

[0028] In the above-mentioned flow valve for a burner, the flow regulating device includes a rotating disk, a valve bottom plate, a rotating shaft, a compression spring, and a limit pin;

[0029] In the above-mentioned flow valve for a burner, the rotating shaft passes through the compression spring, the rotating disk, and the valve bottom plate in sequence, and the rotating shaft is fixed on the valve bottom plate;

[0030] In the above-mentioned flow valve for a burner, the limit pin is fixed in the pin hole of the valve bottom plate, and the limit pin is placed in the limit groove of the rotating plate;

[0031] In the above-mentioned flow valve for a combustion machine, the rotating disk is movably connected to the rotating shaft.

[0032] In the above-mentioned flow valve for a combustion engine, the rotating disk includes a secondary transmission gear meshing with the primary transmission gear, a flow gate, and a first sealing end surface corresponding to the second sealing end surface of the valve bottom plate;

[0033] In the above-mentioned flow valve for a combustion machine, a third shaft hole matching with the rotating shaft is provided at the center of the secondary transmission gear.

[0034] In the above-mentioned flow valve for a burner, the valve chassis includes a pin hole matched with the limit pin, a fourth shaft hole matched with the rotating shaft, and a valve port matched with the flow gate;

[0035] In the above-mentioned flow valve for a combustion machine, when the limit pin contacts the first limit point of the limit groove, the first sealing end surface covers the valve port, and the second sealing end surface covers the flow gate;

[0036] In the above-mentioned flow valve for a burner, when the limit pin contacts the second limit point of the limit groove, the valve port corresponds to the position of the flow gate.

[0037] In the above-mentioned flow valve for a burner, a valve plate installation cavity matching the valve bottom plate is provided in the air intake connection housing, a valve plate positioning portion is provided inside the valve plate installation cavity, and an inner hole of the valve plate positioning portion is smaller than the outer diameter of the valve bottom plate and larger than the outer diameter of the rotating disk;

[0038] In the above-mentioned flow valve for a burner, a lateral connection port adapted to the external connection portion of the lateral connection seat is provided on the outer wall of the air intake connection housing; the outer portion of the guide sleeve forms an external connection portion, the external connection portion is connected to the lateral connection port, and the lateral connection seat is communicated with the valve plate installation cavity;

[0039] In the above-mentioned flow valve for a combustion machine, the valve plate pressure seat of the gas outlet connection housing presses against the valve bottom plate, and the valve bottom plate is tightly attached to the end surface of the valve plate positioning portion.

[0040] Compared with the prior art, the utility model has the following beneficial effects:

[0041] The magnetic linkage device adopted by the utility model realizes power transmission through the magnetic field coupling between the inner magnetic ring wheel and the outer magnetic ring wheel. This setting not only realizes full sealing, avoids the leakage of natural gas, fuel oil and other substances, thereby reducing safety hazards; and there is no wear between the components during the transmission process. At the same time, the stepper motor, planetary reducer, primary transmission gear, secondary transmission gear and other power transmission components adopted by the utility model, by increasing the transmission reduction ratio, subdivides each rotation step of the stepper motor into multiple steps, further improves the flow control accuracy, and is conducive to saving natural gas and other resources;

[0042] The utility model adopts a stepping motor, and no electric spark is generated during driving, so as to avoid fire and explosion accidents; at the same time, the running current of the stepping motor is stable, which is beneficial to prolonging the service life of the utility model.

[0043] The flow regulating device adopted by the utility model has a valve opening angle, that is, the angle at which the rotating disk needs to move to the opening position, thereby having the function of a slow-opening solenoid valve, thereby improving the stability of ignition; at the same time, by ensuring the flatness of the first sealing end face and the second sealing end face in the flow regulating device, full closure without leakage is achieved, thereby improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The utility model is further described with reference to the accompanying drawings:

[0045] Figure 1 It is a structural schematic diagram of the utility model;

[0046] Figure 2 It is an explosion diagram of the planetary reducer in the utility model;

[0047] Figure 3 It is a structural schematic diagram of the secondary planet carrier in the planetary reducer;

[0048] Figure 4 It is a schematic diagram of the external structure of the transmission connecting rod in the planetary reducer;

[0049] Figure 5 It is a schematic diagram of the internal structure of the transmission connecting rod in the planetary reducer;

[0050] Figure 6 This is a schematic diagram of the structure of the lateral connecting seat in the utility model;

[0051] Figure 7 It is a schematic diagram of the structure of the planetary housing in the utility model;

[0052] Figure 8 This is a schematic diagram of the internal structure of the air intake connection housing in the utility model;

[0053] Fig. 9 This is a schematic diagram of the external structure of the air intake connection shell in the utility model;

[0054] Fig.10 This is a schematic diagram of the internal structure of the gas outlet connection housing in the utility model;

[0055] Fig.11 This is a schematic diagram of the external structure of the gas outlet connection shell in the utility model;

[0056] Fig.12 It is a schematic diagram of the explosion structure of the flow regulating device in the utility model;

[0057] Fig.13 It is a partial enlarged schematic diagram of the valve chassis in the flow control device;

[0058] Fig.14It is a structural schematic diagram of a rotating disk in a flow regulating device;

[0059] Fig.15 It is a structural schematic diagram of the flow regulating device in a fully closed state;

[0060] Fig.16 It is a structural schematic diagram of the flow regulating device in a fully open state;

[0061] Fig.17 This is a schematic diagram of the structure of the primary planetary carrier in the planetary reducer.

[0062] In the figure,

[0063] 1- Stepper motor;

[0064] 2-External magnetic ring wheel;

[0065] 3-inner magnetic ring wheel, 301-first shaft hole, 302-second magnetic ring, 303-driving sun wheel;

[0066] 4-Central axis;

[0067] 5-inner gear ring, 501-planetary stop, 502-inner gear;

[0068] 6-Planetary gear;

[0069] 7-primary planet carrier, 701-primary planet disk, 702-primary gear shaft, 703-primary sun hole, 704-primary sun gear;

[0070] 8-secondary planet carrier, 801-secondary planetary disc, 802-secondary gear shaft, 803-secondary connection port, 804-secondary crotch stop;

[0071] 9-transmission connecting rod, 901-connecting head, 902-bead inlet, 903-bead groove, 904-guide rod, 905-primary transmission gear, 906-second shaft hole;

[0072] 10- planetary housing, 1001- reducer inner cavity, 1002- outer magnetic ring cavity, 1003- shaft fixing part;

[0073] 11- lateral connecting seat, 1101- welding positioning step, 1102- steel ball raceway, 1103- guide sleeve, 1104- external connecting part, 1105- first sealing ring groove;

[0074] 12-air inlet connection housing, 1201-air inlet connection internal thread, 1202-valve plate installation cavity, 1203-lateral connection port, 1204-connection flange female seat, 1205-valve plate positioning portion;

[0075] 13-air outlet connection housing, 1301-valve plate pressure seat, 1302-second sealing ring groove, 1303-air outlet connection internal thread, 1304-connecting flange male seat;

[0076] 14-rotating disk, 1401-third shaft hole, 1402-secondary transmission gear, 1403-flow gate, 1404-limiting groove, 14041-first limiting point, 14042-second limiting point, 1405-first sealing end surface;

[0077] 15-valve chassis, 1501-fourth shaft hole, 1502-valve port, 1503-pin hole, 1504-second sealing end surface, 1505-third sealing ring groove;

[0078] 16-rotation axis;

[0079] 17-Compression spring;

[0080] 18-nut;

[0081] 19- small steel balls;

[0082] 20-Limiting pin. DETAILED DESCRIPTION

[0083] The present invention is described in detail below with reference to the accompanying drawings and by means of exemplary embodiments. The following detailed description of the present invention is only for exemplary purposes and is by no means a limitation of the present invention and its application or use.

[0084] Embodiment 1

[0085] Reference Figure 1 , and combined with Figure 2 to Figure 17 As shown, the connection method of the components in the burner flow valve described in the utility model is described in detail.

[0086] The flow valve for the burner mainly comprises a stepper motor 1, a magnetic linkage device, a planetary reducer, a flow regulating device, a lateral connection seat 11, a planetary housing 10, an air inlet connection housing 12, and an air outlet connection housing 13;

[0087] The magnetic linkage device includes an outer magnetic ring wheel 2 and an inner magnetic ring wheel 3 in the planetary reducer; the magnetic field generated by the first magnetic ring of the outer magnetic ring wheel 2 and the second magnetic ring 302 of the inner magnetic ring wheel 3 are in corresponding positions and coaxial;

[0088] Wherein, the output shaft of the stepper motor 1 is coaxially connected with the outer magnetic ring wheel 2;

[0089] The planetary reducer is installed in the planetary housing 10; the planetary housing 10 is fixed on the welding positioning step 1101 of the lateral connecting seat 11 by welding;

[0090] The lateral connection seat 11 is fixed to the lateral connection port 1203 of the air intake connection housing 12 by welding or threaded connection and in combination with a sealing ring;

[0091] The planetary reducer is connected to the secondary transmission gear 1402 on the rotating disk 14 in the flow regulating device through the transmission connecting rod 9 in the planetary reducer;

[0092] The flow regulating device is installed in the air inlet connection housing 12; the flow regulating device includes a rotating disk 14, a valve bottom plate 15, a rotating shaft 16, a compression spring 17, and a limit pin 20; the rotating disk 14 is coaxially installed on the valve bottom plate 15 through the rotating shaft 16, and the compression spring 17 presses the rotating disk 14 on the valve bottom plate 15; at the same time, the valve plate pressure seat 1301 of the air outlet connection housing 13 presses the valve bottom plate 15 tightly against the end surface of the valve plate positioning portion 1205 of the air inlet connection housing 12;

[0093] The air inlet connection housing 12 and the air outlet connection housing 13 are fixed together by welding, threaded connection with a sealing ring, or flange connection with a sealing ring.

[0094] Through the above-mentioned components and the connection method of the components, the principle of the flow valve for the burner described in the utility model is further explained as follows:

[0095] The stepper motor 1 is driven by an external controller. Each time the controller sends a pulse, the stepper motor 1 is driven to run a step angle. The outer magnetic ring wheel 2, which is coaxially connected to the stepper motor 1, rotates synchronously with the stepper motor 1. At the same time, the inner magnetic ring wheel 2 rotates synchronously with the outer magnetic ring wheel 2 through magnetic linkage, and then transmits power to its transmission connecting rod 9 through the planetary reducer, and finally drives the secondary transmission gear 1402 on the rotating disk 14 through the primary transmission gear 905 on the transmission connecting rod 9, so that the rotating disk 14 rotates a certain angle.

[0096] The rotation angle of the rotating disk 14 = (N×step angle of the stepping motor 1) / [reduction ratio of the planetary reducer×(number of teeth of the secondary transmission gear 1402 / number of teeth of the primary transmission gear 905)], where N is the number of pulses sent by the controller.

[0097] According to the working principle of the above-mentioned burner flow valve, refer to Figure 1 and Figure 2 As shown, the magnetic linkage device in the utility model is further described as follows:

[0098] The magnetic linkage device of the utility model comprises an outer magnetic ring wheel 2 and an inner magnetic ring wheel 3.

[0099] The magnetic coupling mode between the outer magnetic ring wheel 2 and the inner magnetic ring wheel 3 can be radial magnetic coupling or axial magnetic coupling.

[0100] The radial magnetic coupling means that the N poles and S poles of the outer magnetic ring wheel 2 and the inner magnetic ring wheel 3 are evenly distributed radially on the first magnetic ring and the second magnetic ring 302, and the inner magnetic ring wheel 3 follows the outer magnetic ring wheel 3 to rotate in the same direction by utilizing the force of attraction between opposite magnetic poles. The radial magnetic coupling can also utilize the force of repulsion between like magnetic poles to make the inner magnetic ring wheel 3 follow the outer magnetic ring wheel 3 to rotate synchronously.

[0101] The axial magnetic coupling means that the N poles and S poles of the outer magnetic ring wheel 2 and the inner magnetic ring wheel 3 are evenly distributed axially on the lower end surface of the outer magnetic ring wheel 2 and the upper end surface of the inner magnetic ring wheel 3, and the inner magnetic ring wheel 3 follows the outer magnetic ring wheel 3 to rotate in the same direction by utilizing the force of opposite charges attracting each other or like charges repelling each other.

[0102] In order to increase the transmission efficiency and make the flow rate regulation more sensitive, the radial magnetic coupling method is preferably used in the utility model.

[0103] In order to make the installation of the magnetic linkage device more reasonable and to make the transmission efficiency of the stepper motor 1 better, an outer magnetic ring cavity 1002 is designed on the planetary housing 10. The stepper motor 1 and the outer magnetic ring wheel 2 are coaxially installed in the outer magnetic ring cavity 1002 through the motor installation positioning plate. A shaft fixing part 1003 is provided below the outer magnetic ring cavity 1002 for positioning the central axis 4; the inner magnetic ring wheel 3 is installed on the central axis 4 through the first shaft hole 302, and the gap between the outer wall of the outer magnetic ring cavity 1002 and the inner wall of the first magnetic ring 302 of the inner magnetic ring wheel 3 is controlled to be between 0.05 and 1.0 mm. In order to make the magnetic coupling force stronger and the assembly more stable, the gap between the two is controlled to be between 0.1 and 0.3 mm.

[0104] Of course, the outer magnetic ring cavity 1002 can also be eliminated, and the outer magnetic ring wheel 3 can be sleeved on the outer wall of the planetary housing 10. However, this will increase the friction between the outer magnetic ring wheel 3 and the planetary housing 10, further affecting the transmission efficiency and the sensitivity of flow regulation.

[0105] The reason why the utility model adopts the stepper motor 1 is that the stepper motor 1 is a brushless motor, and no electric spark is generated, thus avoiding the occurrence of fire or explosion accidents caused by the exposure of natural gas or fuel. The stepper motor 1 is adopted, and the driving current is stable, which is conducive to improving the service life of the controller.

[0106] According to the working principle of the above-mentioned burner flow valve, refer to Figure 2 to Figure 5 , Fig.17 Combined with Figure 1 As shown, the planetary reducer in the utility model is further described as follows:

[0107] The planetary reducer in the utility model comprises an inner gear ring 5, a primary planet carrier 7, a secondary planet carrier 8, a plurality of planetary gears 6, a central shaft 4, and a transmission connecting rod 9.

[0108] Wherein, the planetary gears 6 are respectively mounted on the primary gear shaft 702 of the primary planetary carrier 7 and the secondary gear shaft 802 of the secondary planetary carrier 8;

[0109] It is emphasized that in the present invention, the number of primary planet carriers 7 can be multiple, that is, a primary planet carrier 7 can be further arranged below the primary planet carrier 7, and the multiple primary planet carriers 7 are mutually transmission-connected. At the same time, the uppermost primary planet carrier 7 is transmission-connected to the upper part of the inner magnetic ring wheel 3, and the lowermost primary planet carrier 7 is transmission-connected to the secondary planet carrier 8. By arranging multiple primary planet carriers 7, the transmission reduction ratio of the present embodiment is increased;

[0110] Preferably, a first axial hole 301 matching the central axis 4 is provided at the center of the second magnetic ring 302, the second magnetic ring 302 is coaxially connected with the driving sun gear 303, and the first axial hole 301 penetrates the driving sun gear 303;

[0111] Preferably, a primary planetary disk 701 of the primary planetary carrier 7 is provided with a plurality of primary gear shafts 702 matched with the planetary gears 6, a primary sun hole 703 matched with the central axis 4 is provided at the center of the primary planetary disk 701, a primary sun wheel 704 is provided below the primary planetary disk 701, the primary sun wheel 704 is coaxial with the primary sun hole 703, and the primary sun hole 703 runs through the primary sun wheel 704, and the primary sun wheel 704 is meshed with the planetary gears 6 of the secondary planetary carrier 8;

[0112] The primary planet carrier 7 and the secondary planet carrier 8 are connected to the inner gear ring 5 through the planetary gear 6; the inner gear ring 5 is fixed on the inner wall of the planetary cavity 1001 (see the planetary housing for details). Figure 7 ); the driving sun gear 303 of the inner magnetic ring wheel 3 is connected to the primary planet carrier 7 through the planetary gear 6, and the secondary connecting port 803 of the secondary planet carrier 8 is connected to the transmission connecting rod 9.

[0113] Preferably, the inner gear ring 5 includes an inner gear 502 meshing with the planetary gear 6, and a planetary stop 501 is provided above the inner gear 502 to prevent the planetary gear 6 from disengaging from the inner gear 502 during operation of the planetary reducer, thereby avoiding affecting the transmission efficiency.

[0114] According to the technical characteristics of the planetary reducer mentioned above, the output structure of the planetary reducer is further explained. Figure 2 to Figure 6 As shown below:

[0115] First refer to Figure 2 and Figure 3 As shown, the structure of the secondary planet carrier 8 is described in detail as follows:

[0116] The secondary planetary disc 801 of the secondary planetary carrier 8 is provided with a plurality of secondary gear shafts 802 matched with the planetary gears 6, a secondary crotch stop portion 804 is provided below the secondary planetary disc 801, and a secondary connection port 803 is provided at the center of the secondary planetary disc 801 and the secondary crotch stop portion 804. The shape of the secondary connection port 803 can be a tooth shape, a square mouth, a semicircle, a square groove type, a round groove type, etc. In the present utility model, a tooth shape is preferred.

[0117] The action principle of the planetary reducer in the utility model is further described as follows:

[0118] When the inner magnetic ring wheel 3 rotates, it drives the sun wheel 303 to rotate synchronously, thereby driving the planetary gear 6 on the primary planetary carrier 7 to rotate. The primary planetary carrier 7 rotates under the interaction between the planetary gear 6 and the internal gear 502. At the same time, the primary sun wheel 704 on the primary planetary carrier 7 drives the planetary gear 6 on the secondary planetary carrier 8 to rotate, and the secondary planetary carrier 8 rotates under the joint action of the planetary gear 6 and the internal gear 502.

[0119] Then refer to Figure 4 and Figure 5 As shown, the transmission connecting rod 9 is further described as follows:

[0120] Preferably, a guide rod 904 is designed on the transmission connecting rod 9;

[0121] Preferably, the guide rod 904 is provided with a bead groove 903 and a connector 901 adapted to the secondary connection port 803 in sequence, and a small steel ball 19 is arranged in the bead groove 903; the bead groove 903 is similar to the inner ring of a ball bearing;

[0122] Preferably, a primary transmission gear 905 is provided on the guide rod 904, and the primary transmission gear 905 is in transmission connection with the flow regulating device; the primary transmission gear 905 is the final torque output in the planetary reducer of the utility model.

[0123] Preferably, a second axial hole 906 matching the central axis 4 is provided at the center of the guide rod 904, and the second axial hole 906 passes through the connector 901 and the bead groove 903 in sequence.

[0124] Preferably, a bead inlet 902 is provided on the side of the connector 901, and the bead inlet 902 is connected to the bead groove 903. In order to prevent the small steel ball 19 from escaping from the bead groove 903 during assembly, the number of the bead inlet 902 is one.

[0125] Finally, in order to install the transmission connecting rod 9 on the lateral connecting seat 11, control the axial clearance and radial direction of the transmission connecting rod 9, and the coaxiality with the lateral connecting seat 11, the structure of the lateral connecting seat 11 is further described, specifically referring to Figure 6:

[0126] Preferably, a guide sleeve 1103 matching the guide rod 904 is provided on the lateral connecting seat 11;

[0127] Preferably, a steel ball raceway 1102 is formed on the guide sleeve 1103, and the steel ball raceway 1102 is similar to the outer ring of a ball bearing. Therefore, the steel ball raceway 1102, the small steel balls 19, the ball groove 903, and the secondary crotch stop 804 form a ball bearing.

[0128] In order to further ensure the coaxiality of the transmission connecting rod 9 and the guide sleeve 1103, the lead of the guide sleeve 1103 is designed to be a long lead, and the lead distance is ≥3mm; the coaxiality is further guaranteed, so the center shaft 4 installed on the second axial hole 906 of the transmission connecting rod 9 will not be offset, and the center shaft 4 and the second axial hole 906 are matched in a micro-gap fit, and the maximum gap is less than 0.1mm.

[0129] If the fit clearance is small, the center shaft 4 does not need to be welded to the shaft fixing portion 1003. However, in order to increase the transmission efficiency of the planetary reducer and make the output torque more stable, the preferred solution is to weld the center shaft 4 to the shaft fixing portion 1003.

[0130] In order to fix the planetary housing 10 on the lateral connecting seat 11, the outer part of the steel ball raceway 1102 is formed with a welding positioning step 1101 adapted to the planetary housing 10;

[0131] In order to realize the transmission connection and installation and fixation between the planetary reducer and the flow regulating device, an external connection part 1104 is formed on the outside of the guide sleeve 1103, and a lateral connection port 1203 adapted to the external connection part 1104 of the lateral connection seat 11 is provided on the outer wall of the air intake connection shell 12, and the external connection part 1104 is connected to the lateral connection port 1203, and the lateral connection seat 11 is connected to the valve plate installation cavity 1202. In the utility model, in order to facilitate installation and disassembly, the external connection part 1104 is designed as a threaded structure. In order to further ensure the sealing effect, a first sealing ring groove 1105 is designed above the external connection part 1104 for installing a matching sealing ring. Of course, the external connection part 1104 can also be fixed to the air intake connection shell 12 by welding or gluing.

[0132] In order to further improve the transmission efficiency and flow regulation of the planetary reducer, the central shaft 4 passes through the first shaft hole 301, one or more primary sun holes 703, and the second shaft hole 906 in sequence.

[0133] The stepper motor 1, magnetic linkage device and planetary reducer constitute the primary transmission device of the motor drive. The flow regulating device is further described below. Figure 12 to Figure 16 As shown:

[0134] The flow regulating device includes a rotating disk 14, a valve base 15, a rotating shaft 16, a compression spring 17, and a limit pin 20;

[0135] The rotating shaft 16 passes through the compression spring 17, the rotating disk 14, and the valve chassis 15 in sequence, and the rotating shaft 16 is fixed to the valve chassis 15 by welding, threading, or gluing. In order to facilitate maintenance and assembly, the utility model fixes the rotating shaft 16 to the valve chassis 15 through a nut 18. In order to prevent air contamination, a sealing ring groove is designed above the external thread of the rotating shaft 16 for accommodating a matching sealing ring.

[0136] The limiting pin 20 is fixed in the pin hole 1503 of the valve bottom plate 15, and the limiting pin 20 is placed in the limiting groove 1404 of the rotating plate 14;

[0137] The rotating disk 14 is movably connected to the rotating shaft 16 .

[0138] In the present invention, the number of the limit pins 20 is more than one. However, during the transmission process, in the fully closed state, in order to achieve a better sealing effect and to make the rotating disk 14 more evenly stressed, the number of the limit pins 20 can be multiple and evenly distributed; and the number and distribution position of the limit slots 1404 corresponding to the limit pins 20 correspond to the limit pins 20.

[0139] For further explanation of the rotating disk 14 in the flow regulating device, please refer to Fig.12 , Fig.14 As shown:

[0140] Preferably, the rotating disk 14 includes a secondary transmission gear 1402 meshing with the primary transmission gear 905, a flow gate 1403, and a first sealing end face 1405 corresponding to the second sealing end face 1504 of the valve base 15; the number of the flow gates 1403 is specifically designed according to the flow area. In the utility model, the number of the flow gates 1403 can be multiple and evenly distributed.

[0141] Preferably, a third shaft hole 1401 matching with the rotating shaft 16 is provided at the center of the secondary transmission gear 1402;

[0142] Preferably, the first sealing end face 1405 is in the same plane with the flow gate 1403, the limiting groove 1404 and the third axial hole 1401. To prevent internal leakage, the flatness of the first sealing end face 1405 is 0 to 0.008 mm. In actual operation, the flatness can reach below 0.002 mm.

[0143] For further explanation of the valve base plate 15 in the flow control device, please refer to Fig.12 , Fig.13 As shown:

[0144] The valve chassis 15 includes a pin hole 1503 matching the limit pin 20, a fourth axis hole 1501 matching the rotating shaft 16, and a valve port 1502 matching the flow gate 1403, and the number and shape of the valve port 1502 correspond to the flow gate 1403; in order to prevent internal leakage, the flatness of the second sealing end face 1504 is 0~0.008mm; in the actual operation process, the flatness can reach below 0.002mm.

[0145] Preferably, the second sealing end surface 1504 is in the same plane as the pin hole 1503 , the fourth shaft hole 1501 , and the valve port 1502 .

[0146] Preferably, in order to prevent gas from flowing up and down the valve bottom plate 15, a third sealing ring groove 1505 is designed on the outer wall of the valve bottom plate 15 for installing a matching sealing ring.

[0147] In order to realize the slow opening function of the flow valve for the burner, a valve opening angle is designed between the limit pin 20 and the valve port 1502, and the valve opening angle is between 5° and 20°. The valve opening angle refers to the opening angle from the fully closed position to the just opened position. It can also be said that, for example, the 5th degree belongs to the open position, and 0 to 5 degrees are in a flow blocking state.

[0148] Reference Fig.15 Combination Fig.12 As shown, the position state of the rotating disk 14 and the valve bottom plate 15 in the fully closed state of the flow regulating device in the utility model is further explained. For the convenience of understanding, the number of the limit pins 20 used in the utility model is two, the number of the limit grooves 1404 is two, the number of the flow gates 1403 and the number of the valve ports 1502 are both two, but this shall not limit the utility model, as follows:

[0149] When the limiting pin 20 contacts the first limiting point 14041 of the limiting groove 1404, the first sealing end surface 1405 covers the valve port 1502, and the second sealing end surface 1504 covers the flow gate 1403, so as to achieve full-close control of the flow;

[0150] Reference Fig.16 Combination Fig.12 As shown, the position state of the rotating disk 14 and the valve bottom plate 15 in the fully open state of the flow regulating device in the utility model is further explained. For the convenience of understanding, the number of the limit pins 20 used in the utility model is two, the number of the limit grooves 1404 is two, the number of the flow gates 1403 and the number of the valve ports 1502 are both two, but this is by no means to limit the utility model, as follows:

[0151] When the limiting pin 20 contacts the second limiting point 14042 of the limiting groove 1404 , the valve port 1502 corresponds to the position of the flow gate 1403 to achieve full-open control of the flow.

[0152] To install the flow control device in the corresponding housing, refer to Figure 8 and Fig. 9 As shown, the air intake connection housing 12 in the present invention is further explained as follows:

[0153] Preferably, a valve plate installation cavity 1202 matching the valve bottom plate 15 is provided in the air inlet connection housing 12, a valve plate positioning portion 1205 is provided inside the valve plate installation cavity 1202, and an inner hole of the valve plate positioning portion 1205 is smaller than the outer diameter of the valve bottom plate 15 and larger than the outer diameter of the rotating disk 14;

[0154] In order to connect with the external connecting pipe, an air intake connection internal thread 1201 is provided in the air intake connection housing 12, and the air intake connection internal thread 1201 is connected with the valve plate installation cavity 1202;

[0155] In order to realize the transmission connection and installation and fixation between the planetary reducer and the flow regulating device, a lateral connection port 1203 is formed on the outer wall of the air inlet connection housing 12, which is perpendicular to the valve plate installation cavity 1202 and matches the outer connection portion 1104 of the lateral connection seat 11; the lateral connection seat 11 is connected to the valve plate installation cavity 1202;

[0156] In order to fix the flow regulating device in the intake connection housing 12, refer to Fig.10 and Fig.11 As shown, the valve bottom plate 15 is closely attached to the end surface of the valve plate positioning portion 1205 through the valve plate pressing seat 1301 on the air outlet connecting housing 13, and the valve plate pressing seat 1301 matches the valve plate installation cavity 1202;

[0157] In order to connect with the external connecting pipe, an outlet connection internal thread 1303 connected to the valve plate pressure seat 1301 is also provided on the outlet connection shell 13. In order to fix the air inlet connection shell 12 and the air outlet connection shell 13 together, the two can be fixed together by welding or threaded connection. In order to facilitate user maintenance, the utility model adopts a threaded connection method. Using the threaded connection method, a connecting flange female seat 1204 is designed on the outer wall of the valve plate installation cavity 1202, and a connecting flange male seat 1304 is provided on the lower outer wall of the valve plate pressure seat 1301, and they are fixed together by threaded connection. However, this method requires further sealing, and there are several sealing methods: 1. Install a sealing gasket or apply sealant between the connecting flange male seat 1304 and the connecting flange female seat 1204; 2. Provide a second sealing ring groove 1302 on the outer wall of the valve plate pressure seat 1301, or apply sealant.

[0158] The primary transmission gear 905 and the secondary transmission gear 1402 transmission structure preferably adopted in the present invention are bevel gear structures. The biggest advantage of adopting this structure is that the rotating disk 14 is always in contact with the valve bottom plate 15.

[0159] Embodiment 2

[0160] What is different from Example 1 is that the transmission structure of the primary transmission gear 905 and the secondary transmission gear 1402 is a worm gear transmission structure. The biggest advantage of this structure is that it has a large transmission ratio. The stepper motor 1 only needs to use a very small force to drive the rotating disk 14. However, in order to prevent the rotating disk 14 from deviating outward, it is necessary to increase the elastic force of the compression spring 17. The elastic force should be adjusted according to the output torque of the stepper motor 1. The secondary transmission gear 1402 can be designed on the outer wall of the rotating disk 14, or it can be designed above the flow gate 1403, the limit groove 1404, and the first sealing end face 1405.

[0161] Embodiment 3

[0162] What is different from the first embodiment is that the transmission structure of the primary transmission gear 905 and the secondary transmission gear 1402 is a common gear transmission structure, such as a spur gear transmission structure and a helical gear transmission structure. The secondary transmission gear 1402 can be designed on the outer wall of the rotating disk 14, or can be designed above the flow gate 1403, the limit groove 1404, and the first sealing end face 1405.

[0163] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable those skilled in the art to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the essence of the content of the utility model should be included in the protection scope of the utility model.

Claims

1. A flow valve for a burner, characterized in that: It comprises a stepping motor (1), a magnetic linkage device, a planetary reducer, a flow regulating device, a lateral connecting seat (11), a planetary housing (10), an air inlet connecting housing (12), and an air outlet connecting housing (13); The magnetic linkage device comprises an outer magnetic ring wheel (2) and an inner magnetic ring wheel (3) in the planetary reducer; the magnetic fields generated by the first magnetic ring of the outer magnetic ring wheel (2) and the second magnetic ring (302) of the inner magnetic ring wheel (3) correspond to each other in position and are coaxial; The output shaft of the stepper motor (1) is coaxially connected to the outer magnetic ring wheel (2); The planetary reducer is installed in the planetary housing (10); the planetary housing (10) is fixed on the lateral connecting seat (11); The lateral connection seat (11) is fixed to the lateral connection port (1203) of the air intake connection housing (12); The planetary reducer is transmission-connected to the flow regulating device via a transmission connecting rod (9) in the planetary reducer; The flow regulating device is installed in the air intake connecting housing (12); The air inlet connecting housing (12) is fixed to the air outlet connecting housing (13).

2. A flow valve for a burner according to claim 1, characterized in that: The planetary reducer further comprises an inner gear ring (5), a primary planet carrier (7), a secondary planet carrier (8), a plurality of planetary gears (6), a central shaft (4), and a transmission connecting rod (9); The planetary gears (6) are respectively mounted on the primary planetary carrier (7) and the secondary planetary carrier (8); the primary planetary carrier (7) and the secondary planetary carrier (8) are transmission-connected to the inner gear ring (5) via the planetary gears (6); the inner gear ring (5) is fixed to the inner wall of the planetary housing (10); the driving sun gear (303) of the inner magnetic ring wheel (3) is transmission-connected to the primary planetary carrier (7) via the planetary gears (6), and the secondary connecting port (803) of the secondary planetary carrier (8) is transmission-connected to the transmission connecting rod (9); A first axial hole (301) matching the central axis (4) is provided at the center of the second magnetic ring (302); the second magnetic ring (302) is coaxially connected to the driving sun gear (303); and the first axial hole (301) passes through the driving sun gear (303); A primary planetary disc (701) of the primary planetary carrier (7) is provided with a plurality of primary gear shafts (702) matching the planetary gears (6); a primary sun hole (703) matching the central axis (4) is provided at the center of the primary planetary disc (701); a primary sun wheel (704) is provided below the primary planetary disc (701); the primary sun wheel (704) is coaxial with the primary sun hole (703), and the primary sun hole (703) passes through the primary sun wheel (704); the primary sun wheel (704) is meshed with the planetary gears (6) of the secondary planetary carrier (8); A plurality of secondary gear shafts (802) matching the planetary gears (6) are provided on the secondary planetary disc (801) of the secondary planetary carrier (8), a secondary crotch stop portion (804) is provided below the secondary planetary disc (801), and the secondary connection port (803) is arranged at the center of the secondary planetary disc (801) and the secondary crotch stop portion (804); The inner gear ring (5) comprises an inner gear (502) meshing with the planetary gear (6), and a planetary stop portion (501) is provided above the inner gear (502).

3. A flow valve for a burner according to claim 2, characterized in that: The transmission connecting rod (9) comprises a guide rod (904), wherein the guide rod (904) is provided with a bead groove (903) and a connecting head (901) adapted to the secondary connecting port (803) in sequence, and a small steel ball (19) is arranged in the bead groove (903); The guide rod (904) is provided with a primary transmission gear (905), and the primary transmission gear (905) is in transmission connection with the flow regulating device; A second axial hole (906) matching the central axis (4) is provided at the center of the guide rod (904), and the second axial hole (906) passes through the connecting head (901) and the bead groove (903) in sequence.

4. A flow valve for a burner according to claim 3, characterized in that: A bead inlet (902) is provided on the side of the connector (901), and the bead inlet (902) is communicated with the bead groove (903).

5. A flow valve for a burner according to claim 3, characterized in that: The lateral connecting seat (11) comprises a guide sleeve (1103) matching the guide rod (904), a steel ball raceway (1102) being formed on the guide sleeve (1103), and a welding positioning step (1101) matching the planetary housing (10) being formed on the outside of the steel ball raceway (1102).

6. A flow valve for a burner according to claim 3, characterized in that: The flow regulating device comprises a rotating disk (14), a valve base (15), a rotating shaft (16), a compression spring (17), and a limit pin (20); The rotating shaft (16) passes through the compression spring (17), the rotating disk (14), and the valve base (15) in sequence, and the rotating shaft (16) is fixed on the valve base (15); The limit pin (20) is fixed in the pin hole (1503) of the valve base plate (15), and the limit pin (20) is placed in the limit groove (1404) of the rotating plate (14); The rotating disk (14) is movably connected to the rotating shaft (16).

7. A flow valve for a burner according to claim 6, characterized in that: The rotating disk (14) comprises a secondary transmission gear (1402) meshing with the primary transmission gear (905), a flow gate (1403), and a first sealing end surface (1405) corresponding to a second sealing end surface (1504) of the valve bottom plate (15); A third shaft hole (1401) matching the rotating shaft (16) is provided at the center of the secondary transmission gear (1402).

8. A flow valve for a burner according to claim 7, characterized in that: The valve chassis (15) comprises a pin hole (1503) matching the limit pin (20), a fourth shaft hole (1501) matching the rotating shaft (16), and a valve port (1502) matching the flow gate (1403).

9. A flow valve for a burner according to claim 8, characterized in that: When the limiting pin (20) contacts the first limiting point (14041) of the limiting groove (1404), the first sealing end surface (1405) covers the valve port (1502), and the second sealing end surface (1504) covers the flow gate (1403); When the limiting pin (20) contacts the second limiting point (14042) of the limiting groove (1404), the valve port (1502) corresponds to the position of the flow gate (1403).

10. A flow valve for a burner according to claim 6, characterized in that: A valve plate installation cavity (1202) matching the valve base plate (15) is provided in the air intake connection housing (12); a valve plate positioning portion (1205) is provided on the inner side of the valve plate installation cavity (1202); an inner hole of the valve plate positioning portion (1205) is smaller than the outer diameter of the valve base plate (15) and larger than the outer diameter of the rotating disk (14); A lateral connection opening (1203) adapted to the external connection portion (1104) of the lateral connection seat (11) is provided on the outer wall of the air intake connection housing (12); the external connection portion (1104) is formed on the outside of the guide sleeve (1103), the external connection portion (1104) is connected to the lateral connection opening (1203), and the lateral connection seat (11) is in communication with the valve plate installation cavity (1202); The valve plate pressure seat (1301) of the outlet connection housing (13) presses against the valve bottom plate (15), and the valve bottom plate (15) is tightly attached to the end surface of the valve plate positioning portion (1205).

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