KR101278417B1 - Motor-Operated Valve - Google Patents

Abstract

assignment

It is possible to have a high resolution valve opening degree without using an expensive planetary gear reduction mechanism, and to provide a compact and inexpensive electric valve.

Solution

The electric valve 1 which controls the flow volume of the refrigerant | coolant of an air conditioner has several flat tires 54-58 for decelerating rotation of the electric motor 30 to low speed rotation in order to convert into opening / closing operation | movement of a valve. It is provided with a flat differential speed reduction wheel heating mechanism 50 formed by combining. When the module of the flat gear 54-58 is m, the reduction ratio is 1 / K, and the diameter of the circle which shows the largest external dimension of the gear radial direction of the flat gear type speed reduction rolling mechanism 50 is D, D and K are as follows. In order to satisfy the relationship, the dimensional balance of each flat tooth difference is good, and small size, low cost, high resolution and large reduction ratio can be obtained.

D = αm α = 20 to 100

K = m / β β = 8 to 20

Description

Motor-Operated Valve

1 is a cross-sectional view showing an electric motor and a deceleration mechanism of an electric valve according to the present invention.

2 is a cross-sectional view showing details of the valve body of the electric valve according to the present invention.

3 is a graph showing a relationship between a reduction ratio and a diameter of a circle showing a maximum outer dimension in the gear radial direction of the reduction wheel heating mechanism;

4 is an explanatory diagram showing a circle showing a maximum outline dimension in the gear radial direction of the flat gear reduction mechanism.

(Explanation of symbols for the main parts of the drawing)

1: electric valve 2: driving part

3: gear reduction part 4: screw mechanism part

4a: output portion 5: valve body portion

30: electric motor 31: motor excitation device

32 rotor assembly 33 coil

34: resin mold 35: stator

36: electrical circuit 37: lead

38: power supply 39: output shaft

40: output gear 41: cover

41a: low stage 41b: high stage

42: fitting port 43: gear box

50: deceleration wheel heating mechanism (flat gear)

51, 52, 53: longitudinal axis of rotation (or rotary support shaft) (53: output gear shaft)

54, 55, 56: large diameter gear 57, 58: small diameter gear

60: bearing 61: female thread

62: screw shaft 63: flat screwdriver

64: slit 65: nut member

66: recess 67: ball

70: valve body 72: valve chamber

74: orifice 76: thread

77: valve seat 78a, 78b: piping

79: receiving part 80: valve rod

81: bellows 82: top

83: ring member 84: lower end

85: ball receiving member 90: valve body

Technical field

The present invention relates to an electric valve that controls the flow rate of a refrigerant of an air conditioner, in particular, a flat differential type formed by combining a plurality of flat differentials for decelerating the rotation of the electric motor to low speed rotation in order to convert the valve into an opening and closing operation. TECHNICAL FIELD This invention relates to an electric valve provided with a deceleration wheel heating mechanism.

Background technology

As an electric valve which controls the flow volume of the refrigerant | coolant of an air conditioner, the following two types are known largely as a thing which converts rotation of an electric motor into opening / closing operation | movement of a valve. In the first type, the rotation of the rotor is directly transmitted to the screw mechanism to open and close the valve. For example, Patent Literature 1 and Patent Literature 2 disclose. In the second type, the rotation of the rotor is decelerated by a deceleration device and transmitted to the screw mechanism. For example, Patent Document 3, Patent Document 4, and the like are disclosed.

Patent Document 1: Japanese Patent Application Laid-Open No. 2000-356278

Patent Document 2: Japanese Patent Application Laid-Open No. 2004-197800

Patent Document 3: Japanese Patent Application Laid-Open No. 2002-84732

Patent Document 4: Japanese Patent Application Laid-Open No. 2003-232465

The electric valve of the first type can be configured relatively compactly, but the use is limited to the case of low load, and it is inconvenient that it is difficult to finely set the valve opening degree per one driving pulse. have.

The second type of electric valve can be used even when the load is large, and the valve opening degree per one driving pulse can be finely set. However, the planetary gear type reduction mechanism adopts a compact configuration, for example. It becomes. However, the planetary gear reduction mechanism requires a strict manufacturing precision, a complicated structure, and a high manufacturing cost.

An object of the present invention is to provide a high resolution valve opening degree, and to provide a compact and inexpensive electric valve without using an expensive planetary gear reduction mechanism.

An electric valve according to the present invention is an electric valve for controlling the flow rate of a refrigerant of an air conditioner, and is a flat plate formed by combining a plurality of flat differentials for decelerating at low speed rotation in order to convert the rotation of the electric motor into the opening / closing operation of the valve. A gear reduction wheel heating mechanism is provided, and the flat gear reduction wheel heating mechanism is accommodated in a gear box, and the gear box is provided with a screw mechanism for converting the rotational output from the flat gear reduction wheel heating mechanism into a displacement in the screw axis direction. And the electric motor is rotatably supported by the motor excitation device disposed outside of the gear box and the gear box, and is rotated and driven by the motor excitation device. It is provided with a rotor assembly of a permanent magnet type to input, the outside of the gear box The valve body connected to the said screw mechanism part is arrange | positioned, The said valve body opens and closes a valve chamber, the valve seat formed in a part of the wall surface of the said valve chamber, and the opening formed in the said valve seat in contact with the said valve seat. And a valve rod which receives the output displacement of the screw mechanism portion and folds the valve body with respect to the valve seat. The module of the flat gear used for the flat gear reduction wheel heating mechanism is m, the reduction ratio is K, D and K satisfy the following relationship when the diameter of the circle representing the maximum outer dimension in the radial direction of the gear of the flat gear reduction wheel heating mechanism is D.

D = αm α = 20 to 100

K = β / m β = 8 to 20
The module m is 0.2 to 0.4, the diameter D is 40 mm or less, the reduction ratio K is 30 to 100, the screw pitch of the screw mechanism portion is 0.5 to 1.5 mm, and the screw size Is characterized in that the range of M3 to M7.

According to this electric valve, since the diameter of the flat gear module used for the flat gear type reduction wheel heating mechanism, the reduction ratio, and the diameter of the circle which shows the maximum external dimension of the gear diameter direction are determined in the above-mentioned range, It is possible to obtain an electric valve having a good balance between the dimensions of the flat gear, small size, low cost, and high resolution and large reduction ratio.

The said electric valve WHEREIN: It can be set as the said flat gear type | mold deceleration wheel heating mechanism provided with the deceleration stage which consists of two flat gears which mutually engage. According to such a structure, when the output rotation of an electric motor is input to the flat differential type speed reduction wheel heating mechanism, it is decelerated by a very high deceleration ratio by a plurality of reduction gear stages, and valve opening degree can be controlled with high resolution.

In the electric valve, the module (m) of the flat differential of the flat differential reduction wheel heating mechanism is 0.2 to 0.4, the diameter (D) of the circle representing the maximum external dimension is 40 mm or less, the reduction ratio (K) Can be 30 to 100. By selecting these numerical ranges, it is possible to obtain an electric valve having a large reduction ratio while being sufficiently small in the axial direction and the radial direction without making the manufacturing difficult.

More specifically, the electric valve is a screw for converting the rotational output from the flat gear reduction wheel heating mechanism into an output displacement in the screw axis direction while the flat gear reduction wheel heating mechanism is accommodated in the gear box. A mechanism part is attached to the gear box, and the electric motor is rotatably supported by a motor excitation device disposed outside the gear box, and rotatably supported by the motor excitation device. And a rotor assembly of a permanent magnet type for inputting the rotation to the flat gear reduction wheel mechanism. A valve body connected to the screw mechanism part is disposed outside the gear box, and the valve body includes a valve chamber. And a valve seat formed on a part of the wall surface of the valve chamber, and the valve seat folded over the valve seat. A valve body for opening and closing the opening, a valve rod for receiving the output displacement of the screw mechanism portion, and the valve rod folded with respect to the valve seat, mounted over the valve rod and the valve body, and preventing refrigerant from entering the gear box. The bellows can be provided.

The screw used for the said screw mechanism part is a screw pitch of 0.5-1.5 mm, and screw size can be set as the range of M3-M7. When the rotation of the motor is greatly decelerated by the flat differential reduction wheel mechanism, the rotational output with large torque acts on the screw accordingly. Can operate reliably.

Carrying out the invention  Best form for

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view of the principal part except the valve main body of the electric valve (henceforth simply an "electric valve") provided with the flat differential type speed reducer. In addition, hatching is abbreviate | omitted about some element. It is sectional drawing which shows the detail of the valve main body, screw holder, screw shaft, and ball which are combined with the principal part of the electric valve shown in FIG.

As shown in FIG. 1, the electric valve which shows the whole by the code | symbol 1 is a basic structure, The drive part 2 containing the electric motor which acts as an excitation function, and consists of a stator and a rotor, and the rotation by the drive part 2 The gear reduction unit 3 includes a gear reduction gear unit including a flat gear type reduction wheel heating mechanism for inputting a driving force to decelerate the gear and output the decelerated rotation, and decelerating rotation from the gear reduction unit 3 in the screw axis direction by a screw action. It has the screw mechanism part 4 which converts into a displacement, and outputs it. Although the electric valve 1 is used as a valve completed by connecting the valve body part to the output part of the screw mechanism part 4, the valve body part which should be connected is not shown in FIG. The displacement output in the screw axial direction of the screw mechanism part 4 is transmitted to the valve body part shown with the code | symbol 5 in FIG.

In the electric valve 1, the drive part 2 is the cylindrical motor excitation device 31 which comprises a stator, and the permanent magnet rotor arrange | positioned inside the motor excitation device 31, and is rotationally driven. The electric motor 30 which has the assembly 32 is provided. This electric motor 30 is a stepping motor. The motor excitation device 31 has a coil 33 wound around a bobbin 34 equipped therein, and a stator 35 that is excited by energization of the coil 33, and the coil 33 has an electrical circuit 36. ), The lead 37, and the lead wire 7 are connected to an external power source to receive power. The rotor assembly 32 is provided with the output gear 40 as the output part in the lower end part of the support shaft 39 which transmits the output rotation.

As the whole, the drive part 2 is arrange | positioned above the gear reducer part 3, the support shaft 39 extends into the gear reducer part 3, and the rotation of the output gear 40 is rotated, and the gear reducer part 3 is carried out. To pass on. The drive part 2 and the gear reducer part 3 are covered with the cover 41 which is an airtight container. The cover 41 is an oil-cylindrical container made of a metal material, and the lower portion 41a covers the gear box 43 provided in the gear reducer portion 3, and the lower portion 41a. The electric motor 30 of the drive part 2 is accommodated in the upper part 41b which extends integrally upward of the upper part 41b. In addition, in order to make a drawing easy to see, since the flat level difference of the gear reduction part 3 is shown spreading in the horizontal direction, the cover 41 is drawn in multistage cylindrical shape, In fact, each flat level The car is located below the electric motor 30, and the cover 41 is of a linear cylindrical shape. When the cover 41 is mounted on the motor excitation device 31, the motor excitation device 31 is pressed onto the gear box 43 and fixed by the attachment port 42 formed by the leaf spring. The cover 41 is fixed to the bottom side integrally with a rubber covering portion 34 covering the bottom plate 431 of the gear box 43. The lower peripheral part of the lower part 41a and the peripheral part of the covering part 34 are being fixed by the caulking part 41d, and the inside of the cover 41 is kept sealed from the exterior.

The gear reducer 3 of the electric valve 1 is provided with a flat gear type reduction wheel heating mechanism (hereinafter, abbreviated as "deceleration wheel heating mechanism") 50 for slowing down the rotation of the rotor assembly 32. The reduction wheel heating mechanism 50 is provided for reduction gears provided on the longitudinal rotation shafts 51, 52, 53 arranged in parallel and spaced apart from the support shaft 39 of the drive unit 2, and their longitudinal rotation shafts 51 to 53, respectively. Large diameter gears 54, 55, 56 and small diameter gears 57, 58. The large-diameter gear 54 is engaged with the output gear 40, the small-diameter tooth 57 integral with the large-diameter tooth 54 is engaged with the large-diameter tooth 55, and the small-diameter tooth 58 integral with the large-diameter tooth 55. ) Is meshed with the large diameter gear 56. By these gears, the rotation of the rotor assembly 32 is greatly decelerated and transmitted to the longitudinal rotation shaft 53 integral with the gear 56 at the final stage.

In the screw mechanism part 4 connected to the longitudinal rotation shaft 53 which is an output gear shaft of the reduction gear heating mechanism 50, the rotational output from the longitudinal rotation shaft 53 is flat formed at the lower end of the longitudinal rotation shaft 53. It is transmitted to the screw shaft 62 through the driver part 63. In the upper part of the screw shaft 62, the slit 64 in which this flat driver part 63 is inserted is formed. The screw shaft 62 is screwed to the female screw 61 formed in the inner surface of the cylindrical bearing 60. The recessed part 66 is formed in the lower part of the screw shaft 62, and the ball 67 is fixed to this recessed part 66. As shown in FIG. The nut member 65 fixed to the valve main body part 5 mentioned later is supported by the lower end part of the bearing 60. In addition, the bearing 60 is assembled with the nut member 65 freely. The screw mechanism portion 4 of the electric valve 1 rotates the screw shaft 62 and the ball 67 when the rotation of the rotor assembly 32 is transmitted to the longitudinal rotation shaft 53 through the reduction wheel heating mechanism 50. Through this, it converts into linear motion which opens and closes a valve as mentioned later.

Next, the detail of the valve main-body part 5 of the electric valve 1 is demonstrated. FIG. 2: is sectional drawing which shows the detail of the valve main body 70, the valve rod 80, etc. with which the valve main body part 5 is equipped. In the valve body 70, a valve chamber 72 is formed below the inside, and a valve seat 77 is formed as part of a wall surface of the valve chamber 72. The valve body 70 is provided with an orifice 74 which extends downward from the bottom thereof and communicates with the valve chamber 72. In addition, a pipe 78a communicating with the side surface of the valve chamber 72 and a pipe 78b communicating with the orifice 74 are hermetically attached to the valve body 70 so as to allow the refrigerant to flow in and out. . The outer peripheral portion of the upper end of the valve body 70 is screwed into the inner peripheral portion of the nut member 65 to prevent intrusion into the valve body 70 such as water. In the valve body 70, a chamber 76 is formed in communication with an upper portion of the valve chamber 72 and into which a refrigerant is introduced.

In the valve chamber 72, a valve body 90 is arranged which is folded with respect to the valve seat 77 and opens and closes the opening formed in the valve seat 77. In order to move the valve body 90, the valve rod 80 which is connected to the screw shaft 62 of the screw mechanism 4 is connected to the valve body 90. The upper end portion 82 of the bellows 81 disposed outside the valve rod 80 is fixed to the valve body 70 by a caulking process with the ring member 83 interposed therebetween. Regarding the fixing of the ring member 83 to the valve body 70, airtightness is maintained by soldering in addition to the caulking process.

The lower end 84 of the bellows 81 is fixed to the valve rod 80. The bellows 81 prevents the refrigerant introduced into the seal 76 of the valve body 70 from entering the gear box 43. At the upper end of the valve rod 80, a ball receiving member 85 for the ball 67 is inserted and fixed. As shown in FIG. 1, the screw shaft 62 abuts on the upper portion of the ball 67, and the axial thrust is transmitted to the valve rod 80 side by the screw mechanism 4.

The rotor assembly 32 mounted inside the cover 41 rotates by supplying a drive signal to the coil 33 of the motor excitation device 31.

In the valve main body 5, the valve body 90 is fold | folded with respect to the valve seat 77 by receiving the displacement output of a screw shaft direction, and valve opening degree is changed by the operation | movement. That is, in the valve body part 5, when the screw shaft 62 rotates in the bearing 60, it will be converted into the axial movement of the screw shaft 62, and the amount of movement of the screw shaft 62 in the axial direction will be The valve body 90 is transferred to the valve rod 80 side through the ball 67 and the ball receiving member 85, and the valve body 90 attached to the tip of the valve rod 80 moves linearly in the vertical direction. As a result, the flow path area between the valve body 90 and the orifice 74 is controlled and the flow rate of the refrigerant is adjusted. At this time, the bellows 81 mounted over the valve rod 80 and the valve body 70 prevents the refrigerant introduced into the chamber 76 communicating with the valve chamber 72 from entering the gear box 43. do.

In the deceleration wheel heating mechanism 50, rotation from the output gear 40 of the rotor assembly 32 becomes an input. The output gear 40 is a small diameter gear, and the 1st reduction gear is comprised by the large diameter gear 54 which meshes with the output gear 40, and is supported by the longitudinal rotation shaft 51. As shown in FIG. The second deceleration stage is constituted by the large-diameter gear 55 supported by the large-diameter gear 54 and the longitudinal-rotation shaft 52 adjacent to the small-size gear 57 integral with each other. In this way, the third reduction stage is constituted by the large-diameter gear 56 supported by the longitudinal-rotation shaft (output gear shaft) 53 adjacent to the large-diameter gear 55 and the integral small-size gear 58. The longitudinal rotation shaft (output gear shaft) 53 serves as the output shaft of the reduction wheel heating mechanism 50. Therefore, in the gear reduction unit 3, the output rotation (rotation of the rotor assembly 32) of the electric motor 30 is, for example, a large reduction ratio of about 50 by a plurality of reduction stages connected in the gear radial direction. Is decelerated and transmitted to the screw shaft 62. As a result, the screw shaft 62 can be rotated to a minute rotation speed, and valve opening degree control with high resolution is achieved.

Examples of the electric valve according to the present invention include the following. In the electric valve 1, it is preferable to set it as 0.2-0.4 as the gear module m which determines the magnitude | size of the tooth of the flat gear used for the reduction gear heating mechanism 50. As shown in FIG. If the gear module m is made smaller than this range, the tooth size of the flat gear becomes too small, making manufacturing difficult, and in order to withstand the magnitude of the transmission torque, it is necessary to lengthen the length of the gear axis direction and reduce the gear The gear axial length of the base 3 becomes long. Conversely, if the gear module m is made larger than the above range, the gear module m becomes easier to manufacture, but the tooth diameter becomes large, and a circle showing the maximum external dimension of the flat gear of the reduction wheel heating mechanism 50 (dashed line in FIG. 4). Circle), that is, the size of the electric valve 1 also increases. This circle is the minimum circle including the flat tire of the flat-wheel reduced speed heating mechanism 50 as the diameter and including all flat tires 54 to 58, and the teeth of some or all of the flat gears. Circle to pass through. The reduction wheel heating mechanism 50 can obtain a large value such that the reduction ratio is 30 to 100 while the compactness of the maximum external dimension is 15 to 40 mm in diameter. The screw shaft 62 of the screw mechanism 4 may be a small triangular screw (or a trapezoidal screw or a square screw) of M3 to M7 having a screw pitch of 0.5 to 1.5 mm. Can be.

As an example, the diameter of a circle representing the maximum external dimension in the gear radial direction of the geared down rotational mechanism is 15 to 40 mm, with the number of reduction gears being three or four, and the module m being 0.2, 0.3, 0.4. It is shown in the graph of FIG. 3 that a combination of reducing ratios of 30 to 100 can be obtained.

As the electric valve according to the present invention is configured as described above, the rotation of the electric motor is transmitted at a large deceleration ratio by the deceleration action of the flat differential type reduction wheel heating mechanism, and a large torque can be obtained at the decelerated output. have. Therefore, a strong valve driving force can be exhibited in the screw mechanism part which converts the output rotation of the flat gear type reduction wheel heating mechanism into the opening / closing operation of a valve. In addition, since a largely decelerated rotation is given to the screw mechanism, the moving distance of the valve body with respect to the valve seat, that is, the opening degree of the opening formed in the valve seat can be controlled with high precision, and the high resolution of the valve opening degree is achieved. It can obtain, and the flow volume which passes an electric valve can be controlled with high precision. In addition, with respect to each flat car of the flat car type speed reduction wheel heating mechanism, the specifications of each flat car are well balanced, without imposing strict restrictions on design and manufacturing. Therefore, it is possible to miniaturize the size as much as possible while employing the flat differential speed reduction heating mechanism. In addition, the electric valve according to the present invention is excellent in mass productivity with a simple structure, and can be manufactured at low cost.

Claims (5)

An electric valve for controlling the flow rate of the refrigerant of the air conditioner, And a flat differential speed reduction wheel heating mechanism formed by combining a plurality of flat differentials for decelerating at low speed in order to convert the rotation of the electric motor into the opening and closing operation of the valve. The flat gear reduction wheel heating mechanism is accommodated in the gear box, and the gear box is provided with a screw mechanism for converting the rotational output from the flat gear reduction wheel heating mechanism into a displacement in the screw axis direction. The electric motor is rotatably supported by the motor excitation device disposed outside of the gear box, the gear box, and rotationally driven by the motor excitation device, and the rotation is input to the flat gear reduction wheel heating mechanism. Has a permanent magnet rotor assembly, A valve body connected to the screw mechanism portion is disposed outside the gear box, and the valve body is formed in the valve seat by folding the valve seat, a valve seat formed on a part of a wall surface of the valve chamber, and the valve seat. And a valve rod for opening and closing the opening, and a valve rod for receiving the output displacement of the screw mechanism portion and folding the valve body with respect to the valve seat. When the module of the flat gear used for the flat gear reduction wheel heating mechanism is m, the reduction ratio is K, and the diameter of the circle representing the maximum external dimension in the gear diameter direction of the flat gear reduction wheel heating mechanism is D, D and K are as follows. Satisfy the relationship D = αm α = 20 to 100 K = β / m β = 8 to 20 The module m is 0.2 to 0.4, the diameter D is 40 mm or less, the reduction ratio K is 30 to 100, the screw pitch of the screw mechanism portion is 0.5 to 1.5 mm, and the screw size Is in the range of M3 to M7. The method of claim 1, The said flat differential speed reduction wheel heating mechanism is provided with the multiple speed reduction stage which consists of two flat differentials which mutually engage. The electric valve characterized by the above-mentioned. delete delete delete

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