Butterfly valve and mounting method thereof

Abstract

The invention discloses a butterfly valve and a mounting method thereof, the butterfly valve comprises a body part and a valve part, and the body part comprises a valve body. The valve component comprises a valve rod and a valve plate, the valve plate comprises a plate portion and an installation portion, the installation portion comprises an upper installation portion and a lower installation portion, the upper installation portion is located on one side of the plate portion, the lower installation portion is located on the other side of the plate portion, and the body component further comprises a supporting portion. The upper mounting part is in limited connection or fixed connection with the valve rod, and the lower mounting part is in limited connection with the supporting part. According to the butterfly valve, the rotating torque generated when the valve rod drives the valve plate to rotate can be reduced.

Description

[0001] The present invention claims the priority of the Chinese patent application filed with the Chinese Patent Office on September 8, 2023, with application number 202311162345.2 and invention name “A butterfly valve and its installation method”, the entire contents of which are incorporated by reference into the present invention. Technical Field

[0002] The invention belongs to the technical field of fluid control, and in particular relates to a butterfly valve and an installation method thereof. Background Art

[0003] It is common to use butterfly valves as switch control valves in fluid systems, and they are generally used to control the opening / closing of valve ports with larger fluid diameters. Since the fluid pressure in large-diameter flow channels is relatively high, the valve opening driving force required is relatively large, and the butterfly valve plate design with different structures also has a great influence on the driving force.

[0004] like Figure 7 The patent disclosed in the publication number CN101988589 proposes a butterfly plate structure of an eccentric butterfly valve. In this technology, the butterfly plate of the butterfly valve is eccentrically arranged relative to the driving shaft of the butterfly valve, that is, a positioning block (11, 12) is arranged on the upper and lower sides of the butterfly valve body 1, so that the driving valve stem and the supporting valve stem are respectively matched with the positioning blocks (11, 12), and the axis of the driving valve stem deviates from the longitudinal center axis of the butterfly plate by a certain distance. In the above technical solution, there is a certain torque resistance when the driving valve stem drives the butterfly plate to rotate, which may cause the problem of inflexible valve stem driving.

[0005] Therefore, how to improve the structure of the butterfly valve to increase the flexibility of the valve stem driving the butterfly plate to rotate is an issue that technical personnel in this field need to consider. Summary of the invention

[0006] The present invention discloses a butterfly valve, which comprises a body part and a valve part, wherein the body part comprises a valve body, and the valve body comprises a valve mouth part; the valve part comprises a valve stem and a valve plate, wherein the valve stem is transmission-connected to the valve plate, the valve plate comprises a plate part and a mounting part, the plate part can cooperate with the valve mouth part, the mounting part comprises an upper mounting part and a lower mounting part, the upper mounting part is located on one side of the plate part, and the lower mounting part is located on the other side of the plate part; the body part also comprises a supporting part, the upper mounting part is limit-connected or fixedly connected to the valve stem, and the lower mounting part is limit-connected to the supporting part.

[0007] At the same time, the present invention also discloses a butterfly valve, comprising a body component and a valve component, wherein the body component comprises a valve body, the valve body comprises a valve mouth, the valve body has a valve cavity, the valve component comprises a valve stem and a valve plate, the valve stem is at least partially located in the valve cavity; the valve plate comprises a plate portion and a mounting portion, the mounting portion is rotatably connected to the valve stem, the plate portion comprises an annular sealing portion, and the annular sealing portion cooperates with the valve mouth;

[0008] Define the central axis of the valve stem as X1, the central axis of the annular sealing portion along the thickness direction of the plate portion as X2, and define the section of the butterfly valve passing through X1 and X2 as A, then: the angle (K) between X1 and the plate plane direction of the plate portion is less than or equal to 60°; and in the section A, the intersection (P1) of X1 and X2 is located within the projection contour area (Q) of the plate portion.

[0009] At the same time, the present invention also discloses an installation method of the above butterfly valve technology, comprising the following steps:

[0010] Step one, install the valve plate into the valve cavity; step two, install the support shaft from the lower end of the valve body into the second axial hole of the valve body, so that the upper section of the support shaft is located in the lower mounting hole of the valve plate; step three, install the valve stem from the upper end of the valve body into the first axial hole of the valve body, so that the lower section of the valve stem is located in the upper mounting groove or mounting groove of the valve plate; install the limit pin, so that a part of the limit pin is located in the first limit hole of the valve stem, and another part of the limit pin is located in the second limit hole of the valve plate; step four, install the drive motor and the transmission member, so that the drive motor is connected to the transmission member, and the transmission member is connected to the valve stem.

[0011] At the same time, the present invention also discloses an installation method of the above butterfly valve technology, comprising the following steps:

[0012] Step 1, installing the valve plate into the valve cavity of the valve body;

[0013] Step 2: Install the valve stem from the upper end of the valve body into the first axial hole of the valve body, so that the lower section of the valve stem is located in the mounting groove or mounting hole of the valve plate; install the limit pin, so that a part of the limit pin is located in the first limit hole of the valve stem, and another part of the limit pin is located in the second limit hole of the valve plate;

[0014] Step 3, insert the support shaft into the second shaft hole of the valve body from the lower end of the valve body, so that the upper section of the support shaft is located in the lower mounting hole of the valve plate;

[0015] Step 4: Install the drive motor and the transmission member so that the drive motor is in transmission connection with the transmission member, and the transmission member is in transmission connection with the valve stem.

[0016] The butterfly valve and the installation method thereof provided by the present invention reduce the rotation torque when the valve stem drives the valve plate to rotate by optimizing the structural design of the valve plate, and improve the flexibility of the valve stem driving the valve plate to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 : A main cross-sectional view of a butterfly valve structure provided by the present invention in a valve closing position;

[0018] Figure 2 : Figure 1 An internal view of the mating area between the drive component and the valve component;

[0019] Figure 3 : Figure 1 An enlarged view of the valve plate center area (M) in FIG.

[0020] Figure 4 :The present invention provides a Figure 3 The corresponding change design of the view;

[0021] Figure 5 : Figure 1 Schematic diagram of the three-dimensional structure of the middle valve plate;

[0022] Figure 6 : Figure 1 A central longitudinal section view of the middle valve plate;

[0023] Figure 7 : Background technology A butterfly plate structure diagram of a butterfly valve.

[0024] Figure 1-Figure 6 Illustration:

[0025] 1000-butterfly valve;

[0026] 100- driving components;

[0027] 110- driving motor;

[0028] 120-reduction mechanism;

[0029] 130-base;

[0030] 140- transmission parts;

[0031] 141-keyway;

[0032] 150-hood body;

[0033] 151-driving chamber;

[0034] 200-body parts;

[0035] 210-valve body;

[0036] 211-valve port;

[0037] 212-valve chamber, 213-cylinder chamber;

[0038] 214 - first flow path port, 215 - second flow path port;

[0039] 216-first axial hole, 217-second axial hole;

[0040] 220-support shaft;

[0041] 300-valve components;

[0042] 400-valve plate;

[0043] 410-plate;

[0044] 411-annular sealing portion, 4111-arc surface;

[0045] 420-upper mounting portion;

[0046] 421-upper mounting slot;

[0047] 422-second limiting hole;

[0048] 430-lower mounting portion;

[0049] 431-lower mounting hole;

[0050] 500-valve stem;

[0051] 510-lower section;

[0052] 520-upper section / key shaft;

[0053] 530-first limiting hole;

[0054] 600-limit pin;

[0055] 800 - Seals. DETAILED DESCRIPTION

[0056] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The directional words such as upper and lower involved in this article are defined by the positions of the parts shown in the drawings relative to each other, just for the clarity and convenience of expressing the technical solution. It should be understood that the directional words used in this article should not limit the scope of protection requested by this application.

[0057] Figure 1This is a main cross-sectional view of a butterfly valve structure in the valve closing position provided by the present invention. Figure 2 for Figure 1 Internal view of the mating area between the drive component and the valve component.

[0058] like Figure 1 and Figure 2 In this embodiment, the butterfly valve 1000 is specifically used as an electric switch valve, which mainly includes three parts: a driving component 100, a body component 200 and a valve component 300.

[0059] The driving component 100 includes a base 130 and a cover 150, the base 130 and the cover 150 are connected by welding, and the cover 150 and the base 130 are sealed to form a driving chamber 151. The driving chamber 151 is provided with a driving motor 110, a reduction mechanism 120 and a transmission member 140, the driving motor 110 is in driving connection with the reduction mechanism 120, and the reduction mechanism 120 is in driving connection with the transmission member 140.

[0060] The body component 200 includes a valve body 210, and the valve body 210 is fixedly connected to the base 130 of the driving component 100. The valve body 210 has a valve cavity 212, and the valve cavity 212 includes a first axial hole 216 extending longitudinally and a cylindrical cavity 213, and a part of the inner wall of the cylindrical cavity 213 serves as a valve port 211. The valve body 210 also includes a first flow path port 214 and a second flow path port 215, and the cylindrical cavity 213 communicates the first flow path port 214 with the second flow path port 215.

[0061] The valve component 300 includes a valve stem 500 and a valve plate 400. The valve stem 500 is inserted into the first shaft hole 216 of the valve cavity 212. The upper section of the valve stem 500 includes a key shaft 520, and the lower section of the transmission member 140 includes a key groove 141. The transmission member 140 and the valve stem 500 are connected to each other through the key groove. The valve plate 400 includes a plate portion 410 and a mounting portion. The plate portion 410 is generally in the shape of a circular plate and includes an annular sealing portion 411. The annular sealing portion 411 cooperates with the valve port portion 211.

[0062] When the driving motor 110 is running, the valve plate 400 is driven to rotate through the valve stem 500 , and when the annular sealing portion 411 is in contact with the valve opening portion 211 , the flow passage between the first flow path port 214 and the second flow path port 215 is closed.

[0063] Figure 5 for Figure 1 Schematic diagram of the three-dimensional structure of the middle valve plate. Figure 6 for Figure 1 Central longitudinal section view of the middle valve plate.

[0064] like Figure 5 , Figure 6 Shown and see Figure 1The body part 200 further includes a support portion, and in this specific embodiment, the support portion is specifically a support shaft 220. The support shaft 220 is embedded in the second shaft hole 217 at the lower part of the valve body 210 and fixed thereto, and the support shaft 220 is coaxially arranged with the valve stem 500. The upper section of the support shaft 220 extends into the valve cavity 212.

[0065] The plate portion 410 of the valve plate 400 is generally in the shape of a flat plate, the annular sealing portion 411 protrudes outward to form an arc surface 4111, and the inner wall of the cylindrical cavity 213 of the valve cavity 212 serves as a partial spherical surface of the valve opening portion 211 (the center point of the spherical surface is the aforementioned P2). The valve plate 400 can be rotated to make the arc surface 4111 fit with the valve opening portion 211 to seal the valve opening.

[0066] The mounting portion of the valve plate 400 includes an upper mounting portion 420 and a lower mounting portion 430, and the upper mounting portion 420, the lower mounting portion 430 and the plate portion 410 can be integrally formed by metal materials. The upper mounting portion 420 is located on one side of the longitudinal surface of the plate portion 410, and the lower mounting portion 430 is located on the other side of the plate portion 410. In this design, since the upper mounting portion 420 and the lower mounting portion 430 are located on different sides of the plate portion 410, the plate portion 410 is subjected to a relatively balanced force when rotating, which reduces the torque during the rotation of the plate portion 410 and improves the flexibility of the valve stem driving the valve plate to rotate.

[0067] As a further extension of the technical solution, the upper mounting portion 420 includes an upper mounting groove 421, which is a transverse through groove, and has a transversely arranged second limiting hole 422 on the outer side wall of the groove, and the lower mounting portion 430 includes a lower mounting hole 431. The lower end 510 of the valve stem 500 includes a transversely arranged first limiting hole 530, and the valve component 300 also includes a limiting pin 600, a part of which is located in the first limiting hole 530, and another part is located in the second limiting hole 422.

[0068] Of course, the above is only a preferred solution. As a technical alternative, the upper mounting groove 421 of the upper mounting portion 420 can also be replaced by an upper mounting hole. The lower mounting hole 431 of the lower mounting portion 430 can also be replaced by a lower mounting groove.

[0069] Figure 3 for Figure 1 Magnified view of the center area (M) of the valve plate.

[0070] like Figure 3 Shown and referenced Figure 1 and Figure 5As a further technical solution, the central axis of the valve stem 500 is defined as X1, and the central axis of the annular sealing portion 411 along the thickness direction of the plate portion 410 is defined as X2. As a preferred design solution, X1 and X2 are approximately in the same plane (those skilled in the art will understand that the actual structure may be subject to assembly errors or avoidance of non-substantial deviations, so the term "approximately" is defined). The cross section of the butterfly valve 1000 passing through X1 and X2 (i.e. Figure 1 The cross-section shown is defined as A. Then:

[0071] X1 and the plate plane direction of the plate portion 410 ( Figure 3 The angle K in the X3 direction is less than or equal to 60°; and on the cross section A, the intersection point P1 of X1 and X2 is located within the projection contour area Q of the plate portion 410.

[0072] The design of the above technical solution makes the plate plane of the plate portion and the central axis of the valve stem inclined. At the same time, by optimizing the positional relationship between the central axis of the valve stem and the plate portion (i.e., the intersection P1 of the valve stem rotation axis X1 and the central axis X2 of the annular sealing portion does not deviate from the main body of the plate portion), the rotational torque when the valve stem drives the valve plate to rotate can be reduced, thereby improving the flexibility of the valve stem driving the valve plate to rotate.

[0073] As a further optimization of the above technical solution, the thickness of the plate portion 410 is defined as W1, and the thickness direction of the plate portion 410 (i.e. Figure 3 The distance from point P1 to the center of the plate 410 (i.e., the center plane in the thickness direction of the plate) is W2 (i.e., Figure 3 , the distance from P1 to the center axis X3 of the plate thickness), then: W2≤1 / 4W1. That is, the intersection P1 is in the middle half area in the thickness direction of the plate portion 410, further reducing the rotation torque when the valve stem 500 drives the valve plate 400 to rotate.

[0074] Figure 4 The present invention provides a Figure 3 The design changes correspond to the scheme shown in the figure.

[0075] like Figure 4 Shown and referenced Figure 3 As a further optimization of the above technical solution, along the thickness direction of the plate portion 410, point P1 is approximately located at the center position point of the plate portion 410 (i.e., on the center plane of the valve plate thickness); and further, in the section A, the projection contour of the valve mouth portion 211 is an arc segment, and the center point of the circle defined by the arc segment is defined as P2 (P2 is the center point of the cylindrical cavity 213), and point P1 and point P2 are approximately coincident. In the above technical solution, without considering the influence of other mounting structures of the valve plate, the rotational torque is basically eliminated when the valve stem 500 drives the valve plate 400 to rotate.

[0076] It should be noted that those skilled in the art can understand that due to manufacturing and installation errors, or tolerance control and other factors, point P1 is only very close to the center of the plate 410, and point P1 and point P2 are only close to coincide. Based on the effect of the present invention, the range of "approximately" is limited to within 4 times the normal tolerance of the normal deviation.

[0077] Because when other conditions remain unchanged, the larger the valve plate diameter, the greater the potential rotation torque generated when the valve stem drives the valve plate to rotate. As a further extension of the technical solution, the preferred combination is: if the diameter of the annular sealing portion 411 of the plate portion 410 is between 50mm and 100mm, the angle K between X1 and the plate plane direction of the plate portion 410 is between 15° and 30°; if the diameter of the annular sealing portion 411 is greater than 100mm, the angle K between X1 and the plate plane direction of the plate portion 410 is between 2° and 15°; if the diameter of the annular sealing portion 411 is less than 50mm, the angle K between X1 and the plate plane direction of the plate portion 410 is between 30° and 45°.

[0078] The main assembly process of butterfly valve 1000 is as follows:

[0079] Step 1: Install the valve plate 400 into the valve cavity 212;

[0080] Step 2: Install the seal in the outer groove of the support shaft 220, and install the support shaft 220 into the second shaft hole 217 from the lower end of the valve body 210, so that the upper section of the support shaft 220 is located in the installation hole 431;

[0081] Step three, install the valve stem 500 into the first axial hole 216 from the upper end of the valve body 210, so that the lower section 510 of the valve stem 500 is located in the installation groove 421, and install the limit pin 600 from the side of the installation groove 421, so that a part of the limit pin 600 is located in the first limit hole 530, and another part is located in the second limit hole 422.

[0082] Step 4: Install the drive motor 110 and the transmission member 140 so that the drive motor 110 is in transmission connection with the transmission member 140 , and the transmission member 140 is in transmission connection with the valve stem 500 .

[0083] As an alternative to the above assembly process, the order of the above step 2 and the above step 3 can be interchanged.

[0084] The above are only preferred implementation modes for better illustrating the technical solution of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. All these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A butterfly valve, comprising a body component and a valve component, wherein the body component comprises a valve body, and the valve body comprises a valve port, characterized in that; The valve component includes a valve stem and a valve plate, the valve stem is drivingly connected to the valve plate, the valve plate includes a plate portion and a mounting portion, the plate portion can cooperate with the valve mouth portion, the mounting portion includes an upper mounting portion and a lower mounting portion, the upper mounting portion is located on one side of the plate portion, and the lower mounting portion is located on the other side of the plate portion, the main body component also includes a supporting portion, the upper mounting portion is limitedly connected or fixedly connected to the valve stem, and the lower mounting portion is limitedly connected to the supporting portion.

2. The butterfly valve according to claim 1, characterized in that: The support portion includes a support shaft, which is fixedly connected to the valve body; the upper mounting portion includes an upper mounting groove or an upper mounting hole, and the lower section of the valve stem is located in the upper mounting groove or the upper mounting hole; the lower mounting portion includes a lower mounting groove or a lower mounting hole, and the upper section of the support shaft is located in the lower mounting groove or the lower mounting hole.

3. The butterfly valve according to claim 2, characterized in that: The valve component also includes a limit pin, the valve stem includes a first limit hole arranged transversely, the upper mounting portion includes a second limit hole arranged transversely, a portion of the limit pin is located in the first limit hole, and another portion of the limit pin is located in the second limit hole.

4. The butterfly valve according to claim 2, characterized in that: The upper mounting portion, the lower mounting portion and the plate portion are integrally formed by metal material.

5. The butterfly valve according to any one of claims 1 to 4, characterized in that: It also includes a driving component, which includes a driving motor and a transmission component. The driving motor is drivingly connected to the transmission component, and the transmission component is drivingly connected to the valve stem.

6. The butterfly valve according to any one of claims 1 to 4, characterized in that: The central axis of the valve stem is defined as X1, and the angle (K) between X1 and the plate plane direction of the plate portion is less than or equal to 60°; The plate portion includes an annular sealing portion, which cooperates with the valve mouth portion. The central axis of the annular sealing portion along the thickness direction of the plate portion is defined as X2. X2 and X1 are approximately located in the same plane. The section passing through X1 and X2 is defined as A. Then, in the section A, the intersection point (P1) of X1 and X2 is located within the projection contour area (Q) of the plate portion.

7. The butterfly valve according to claim 6, characterized in that: The thickness of the plate portion is defined as W1, and along the thickness direction of the plate portion, the distance from the point P1 to the center point of the plate portion is defined as W2, which satisfies: W2≤1 / 4W1.

8. The butterfly valve according to claim 7, characterized in that: Along the thickness direction of the plate portion, the point P1 is approximately located at the center point of the plate portion.

9. The butterfly valve according to claim 6, characterized in that: In the cross section A, the projection contour of the valve mouth is an arc segment, and the center point of the circle defined by the arc segment is defined as P2, and the point P1 and the point P2 are substantially coincident.

10. The butterfly valve according to claim 7, characterized in that: The diameter of the annular sealing portion of the plate portion is between 50 mm and 100 mm, and the angle (K) between X1 and the plate plane direction of the plate portion is between 15° and 30°; Or, the diameter of the annular sealing portion of the plate portion is greater than 100 mm, and the angle (K) between X1 and the plate plane direction of the plate portion is between 2° and 15°; Alternatively, the diameter of the annular sealing portion of the plate portion is less than 50 mm, and the angle (K) between X1 and the plate plane direction of the plate portion is between 30° and 45°.

11. A butterfly valve, comprising a body component and a valve component, wherein the body component comprises a valve body, the valve body comprises a valve port, the valve body has a valve cavity, the valve component comprises a valve stem and a valve plate, the valve stem is at least partially located in the valve cavity, characterized in that: The valve plate includes a plate portion and a mounting portion, the mounting portion is drivingly connected to the valve stem, the plate portion includes an annular sealing portion, and the annular sealing portion cooperates with the valve mouth portion; the central axis of the valve stem is defined as X1, the central axis of the annular sealing portion along the thickness direction of the plate portion is defined as X2, and the section of the butterfly valve passing through X1 and X2 is defined as A, then: the angle (K) between X1 and the plate plane direction of the plate portion is less than or equal to 60°; and in the section A, the intersection (P1) of X1 and X2 is located within the projection contour area (Q) of the plate portion.

12. The method for installing a butterfly valve according to any one of claims 2 to 10, characterized in that: The steps include: Step 1, installing the valve plate into the valve cavity of the valve body; Step 2: Install the support shaft from the lower end of the valve body into the second shaft hole of the valve body so that the upper section of the support shaft is located in the lower mounting hole of the valve plate; Step 3, install the valve stem from the upper end of the valve body into the first axial hole of the valve body, so that the lower section of the valve stem is located in the mounting groove or mounting hole of the valve plate; install the limit pin, so that a part of the limit pin is located in the first limit hole of the valve stem, and another part of the limit pin is located in the second limit hole of the valve plate; Step 4: Install the drive motor and the transmission member so that the drive motor is in transmission connection with the transmission member, and the transmission member is in transmission connection with the valve stem.

13. The method for installing a butterfly valve according to any one of claims 2 to 10, characterized in that: The steps include: Step 1, installing the valve plate into the valve cavity of the valve body; Step 2: Install the valve stem from the upper end of the valve body into the first axial hole of the valve body, so that the lower section of the valve stem is located in the mounting groove or mounting hole of the valve plate; install the limit pin, so that a part of the limit pin is located in the first limit hole of the valve stem, and another part of the limit pin is located in the second limit hole of the valve plate; Step 3, insert the support shaft into the second shaft hole of the valve body from the lower end of the valve body, so that the upper section of the support shaft is located in the lower mounting hole of the valve plate; Step 4: Install the drive motor and the transmission member so that the drive motor is in transmission connection with the transmission member, and the transmission member is in transmission connection with the valve stem.

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