CN110735932A - Link Butterfly Valve with Link Adjustment Mechanism - Google Patents

Abstract

The invention relates to a connecting rod butterfly valve with a connecting rod adjusting mechanism, comprising a valve body, a connecting rod structure, an adjusting structure, a sealing structure and a limit structure. , Auxiliary adjustment rod and valve rod, crank and connecting rod are connected to the valve plate seat frame, one end of the main adjustment rod is connected to the valve rod, and one end of the auxiliary adjustment rod is connected to the connecting rod. The adjustment structure includes a pin shaft, a pin sleeve, and the main control The rod, the auxiliary control rod and the adjusting nut, the inner ends of the main control rod and the auxiliary control rod are hinged with the main adjusting rod and the auxiliary adjusting rod respectively, the middle section is processed with a thread matched with the adjusting nut, and the outer end is processed with an axial scale; The sealing structure is composed of the packing seat, the packing and the gland; the limit structure fixes the adjusting nut through the end cover and the fixing sheet. The present invention has a better adjustment function for errors generated during production and assembly and deformation during use, and can effectively reduce maintenance costs.

Description

Link Butterfly Valve with Link Adjustment Mechanism

technical field

The invention relates to the technical field of valve control, in particular to a connecting rod butterfly valve with a connecting rod adjusting mechanism.

Background technique

The connecting rod butterfly valve is a kind of regulating valve with simple structure, which is mainly used in petrochemical and metallurgical industries. At present, the tightness adjustment of the connecting rod butterfly valve is carried out at the factory, and it is difficult to adjust it according to the actual needs after it is applied to the corresponding pipeline occasion.

The connecting rod butterfly valve in the prior art includes a valve body, a valve plate, a valve stem, an active rod, a driven rod, and a fixed rod, wherein the fixed rod is connected to the valve body through an adjustment rod, one end of the adjustment rod is connected to the fixed rod, and the other end passes through The valve body is fixed and sealed with a cap nut and a gasket, and the installation position can be adjusted by adjusting the rod.

However, during the use of the valve, factors such as bearing wear and deformation of the connecting rod mechanism will cause the seal to fail. The prior art also only solves the problem of correcting the radial deformation of the valve due to bearing wear and valve stem deformation, but still has the deficiency that the axial deformation and the deformation of the connecting rod structure cannot be corrected.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, the present invention provides a connecting rod butterfly valve with a connecting rod adjusting mechanism, so as to solve the problems caused by factors such as the correction of production and installation errors and the deformation of parts during use. The problem of poor sealing.

The technical solution adopted by the present invention to solve the technical problem is: a connecting rod butterfly valve with a connecting rod adjusting mechanism, comprising a valve body, a connecting rod mechanism, an adjusting structure sealing mechanism and a limit mechanism, and is characterized by:

Connecting rod mechanism: It has a valve plate seat frame installed in the valve body, a valve rod, a main adjustment rod and a sub-adjustment rod arranged on the front side of the valve plate seat frame. The valve plate seat frame is hinged with a crank and a connecting rod, and the main adjustment rod One end is connected to the valve rod, one end of the auxiliary adjustment rod is connected with the connecting rod through a pin shaft, and the middle part of the main adjustment rod and the auxiliary adjustment rod are crossed and connected through the pin shaft;

Adjustment structure: It has a main control rod and a secondary control rod, the inner end of the main control rod is hinged with the other end of the main control rod, the inner end of the secondary control rod is hinged with the other end of the secondary control rod, and the outer ends of the primary control rod and the secondary control rod are both extended Out of the valve body and marked with an axial scale, the middle of the main control rod and the auxiliary control rod are connected with adjusting nuts;

Sealing structure: it includes a packing seat fixed on the valve body wall and a gland mounted in cooperation with the packing seat, and the packing is filled between the gland and the packing seat;

Limiting structure: it includes an end cover that is fixedly connected with the end face of the packing seat, and the end cover is inserted with a fixed piece that restricts the axial movement of the adjusting nut;

The main control rod and the auxiliary control rod extend out of the end cover through the packing seat, and the adjustment nut is located outside the end cover.

Specifically, the other ends of the main adjustment rod and the auxiliary adjustment rod both have a chute, and the chute is provided with a pin shaft connecting the main control rod and the auxiliary control rod.

The end cover is provided with a rectangular groove, the outer end of the fixing piece has a rectangular piece that is clamped with the rectangular groove on the end cover, and the inner end of the fixing piece has a semicircular notch that is clamped into the cylindrical groove of the adjusting nut.

The outer side of the adjusting nut has a sleeve with an integrated structure, the outer edge of the sleeve is marked with a circumferential scale of 0.1mm per grid, and the outer ends of the main control rod and the auxiliary control rod marked with the axial scale extend out of the sleeve. outside the barrel.

The packing seat has an inner cavity, the gland has a cylindrical portion matched with the inner cavity, the packing is located between the inner wall of the inner cavity and the cylindrical portion of the gland, and the packing is expanded graphite that can withstand a high temperature of 600°C Seal packing.

The beneficial effects of the present invention are as follows: the present invention can correct the lax sealing caused by various working conditions, and compensate the displacement of the connecting rod mechanism due to bearing wear and valve stem deformation through the integral movement of the main adjusting rod and the auxiliary adjusting rod; By changing the installation angle of the main adjustment rod and the auxiliary adjustment rod, the dimensional changes caused by the deformation of the crank, valve plate seat frame and connecting rod are compensated; by adjusting the extension of the main control rod and the auxiliary control rod, the main adjustment rod and the auxiliary The installation position and installation angle of the adjustment rod can quantify the valve adjustment, realize the better adjustment function of the error caused by the production and assembly process and the deformation caused in the use process, and effectively reduce the maintenance cost.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Figure 1 is a schematic diagram of the three-dimensional structure of the present invention.

FIG. 2 is a partial enlarged schematic view of the position A in FIG. 1 .

FIG. 3 is a two-dimensional cross-sectional view of the present invention.

FIG. 4 is a diagram showing the relationship of the connecting rod structure of the present invention.

In the figure: 1. valve body; 2. valve plate seat frame; 3. connecting rod; 4. auxiliary adjusting rod; 5. main adjusting rod; 6. main control rod; 7. packing seat; 8. gland; 9. End cover; 10. Adjusting nut; 11. Fixing plate; 12. Packing 13. Sub-control rod; 14. Valve stem; 15. Crank.

Detailed ways

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the present invention in a schematic manner, so they only show the structures related to the present invention.

As shown in Figures 1 and 2, a connecting rod butterfly valve with a connecting rod adjusting mechanism includes a valve body 1, a connecting rod mechanism, an adjusting structure sealing mechanism and a limit mechanism.

The connecting rod mechanism: has a valve plate seat frame 2 installed in the valve body 1 , a valve rod 14 arranged on the front side of the valve plate seat frame 2 , a main adjusting rod 5 and an auxiliary adjusting rod 6 , on the valve plate seat frame 2 A crank 15 and a connecting rod 3 are hinged, one end of the main adjusting rod 5 is connected to the valve rod 14, one end of the auxiliary adjusting rod 4 is connected with the connecting rod 3 through a pin, and the middle of the main adjusting rod 5 and the middle of the auxiliary adjusting rod 4 are connected by a pin. ;

Adjustment structure: it has a main control rod 6 and a secondary control rod 13, the inner end of the main control rod 6 is hinged with the other end of the main control rod 5, the inner end of the secondary control rod 13 is hinged with the other end of the secondary control rod 4, the main control rod 6 and the secondary control rod are hinged. The outer ends of the control rods 13 protrude out of the valve body 1 and are marked with axial scales, each of which is 1 mm.

The middle parts of the main control rod 6 and the auxiliary control rod 13 are connected with an adjusting nut 10 with a thread pitch of 2 mm. The outer side of the adjusting nut 10 has a sleeve with an integrated structure, and the outer edge of the sleeve is marked with a circumference of 0.1 mm per grid. to the scale.

The other ends of the main adjustment rod 5 and the auxiliary adjustment rod 4 are provided with sliding grooves, and the sliding grooves are provided with pins connecting the main control rod 6 and the auxiliary control rod 13 .

Sealing structure: including a packing seat 7 and a gland 8 fixed on the wall of the valve body 1, the packing seat 7 has an inner cavity, and the gland 8 has a cylindrical part matched with the inner cavity, which is located between the inner wall of the inner cavity and the inner cavity. A filler 12 is filled between the cylindrical parts of the gland 8, and the filler 12 is an expanded graphite sealing filler that can withstand a high temperature of 600°C.

Limiting structure: including an end cover 9 fixedly connected with the end face of the packing seat 7, the adjusting nut 10 is located outside the end cover 9, and the end cover 9 is inserted with a fixing plate 11 that restricts the axial movement of the adjusting nut 10; the The end cover 9 has a rectangular groove, the outer end of the fixing piece 11 has a rectangular piece that is clamped with the rectangular groove on the end cover 9 , and the inner end of the fixing piece 11 has a semicircular notch that is clamped into the cylindrical groove of the adjusting nut 10 . After the adjustment is completed, the fixing plate 11 , the end cover 9 and the packing seat 7 are fixedly connected by bolt connection to limit the axial movement of the adjusting nut 10 .

The main control rod 6 and the auxiliary control rod 13 pass through the inner cavity of the cylindrical portion of the gland 8 through the packing seat 7, extend out of the end cover 9, and then protrude through the inner hole of the sleeve of the adjusting nut 10. The outer ends of the main control rod 6 and the auxiliary control rod 13 with axial graduations protrude out of the sleeve.

The following table 1 is an adjustment query table of the present invention, and the adjustment parameters of the main control rod 6 and the auxiliary control rod 13 can be determined by looking up the following table. The main steps of generating the table are:

(1) As shown in Figures 3 and 4, the distance DE from the connection between the main regulating rod 5 and the auxiliary regulating rod 4 to the center of the valve rod 14, the axis of the main control rod 6 and the secondary control rod 13 on the valve symmetry plane are established according to the geometric relationship The distance L3, the distance between the center of the connecting pin of the main adjusting rod 5 and the auxiliary adjusting rod 4 to the center of the connecting pin of the connecting rod 3 and the auxiliary adjusting rod 4, the distance BE from the axis of the main control rod 6 on the valve symmetry plane to the upper end face of the valve Distance L2, the distance from the center of the valve stem 14 on the symmetrical plane of the valve to the upper end face of the valve L1, the distance from the center of the valve stem 14 on the symmetrical plane of the valve to the inner wall of the right side of the valve X1, the center hole on the valve plate seat frame 2 connecting the connecting rod 3 and the crank 15 The distance between AC, the length CD between the center holes at both ends of the crank 15, the length AB between the center holes at both ends of the connecting rod 3, the length s1 of the main control rod 6 extending into the valve, the auxiliary control rod 13 extending to the valve The numerical constraint relationship between the length s2 inside, the adjustment scale a1 of the main control rod 6 and the adjustment scale a2 of the auxiliary control rod 13 .

AC=BE sinα+DE sinβ (5)

CD-AB=BE cosα-DE cosβ (6)

a1=100-s1, a2=100-s2 (7)

(where DE, L3, BE, L2 are known quantities in the design, L1, X1, AC, CD, AB are input quantities, and a1 and a2 are output quantities.) Put formulas (1), (2), (3) ), (4), (7) into formulas (5) and (6) to obtain the implicit equations of s1 and s2 about L1, X1, AC, CD, AB.

(2) Determine the distance L1 from the center of the valve stem 14 on the valve symmetry plane to the upper end face of the valve, the distance X1 from the center of the valve stem 14 on the valve symmetry plane to the right inner wall of the valve, the length AB between the central holes at both ends of the connecting rod 3, and the crank 15 The applicable range of the length CD between the central holes at both ends and the distance AC between the central holes connecting the connecting rod 3 and the crank 15 on the valve plate seat frame 2 .

(3) According to the increasing order of L1-L2, X1, CD-AB, AC values, establish a table with six columns of parameters L1-L2, X1, CD-AB, AC, a1, a2, as shown in Table 1 below.

The specific adjustment method is as follows: as shown in Figure 3 and referring to Table 1, first, by measuring the distance L1 between the center of the valve stem 14 and the upper end of the valve body 1, and the distance L2 between the axis of the main control rod 6 and the upper end of the valve body 1, the valve The distance X1 between the center of the rod 14 and the inner wall of the valve body 1, the length AB between the central holes at both ends of the connecting rod 3, the length CD between the central holes at both ends of the crank 15, and the connecting rod 3 on the valve plate seat frame 2 The distance AC from the center hole of the crank 15 corresponds to the corresponding position of each column one by one according to the parameter sequence in Table 1, and finally the adjustment scale a1 of the main control rod 6 and the adjustment scale a2 of the auxiliary control rod 13 are obtained.

Table 1

Taking the above ideal embodiments according to the present invention as inspiration, and through the above description, relevant personnel can make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the contents in the specification, and the technical scope must be determined according to the scope of the claims.

Claims (5)

1. A connecting rod butterfly valve with a connecting rod adjusting mechanism, comprising a valve body (1), a connecting rod mechanism, an adjusting structure sealing mechanism and a limit mechanism, characterized in that: Linkage mechanism: it has a valve plate seat frame (2) installed in the valve body (1), a valve stem (14) arranged on the front side of the valve plate seat frame (2), a main adjusting rod (5) and a secondary adjusting rod (6), a crank (15) and a connecting rod (3) are hinged on the valve plate seat frame (2), one end of the main adjusting rod (5) is connected to the valve rod (14), and one end of the auxiliary adjusting rod (4) is connected by a pin The shaft is connected with the connecting rod (3), and the middle part of the main adjusting rod (5) and the auxiliary adjusting rod (4) are crossed and connected by a pin shaft; Adjustment structure: it has a main control rod (6) and an auxiliary control rod (13), the inner end of the main control rod (6) is hinged with the other end of the main adjustment rod (5), and the inner end of the auxiliary control rod (13) is connected with the auxiliary adjustment rod ( 4) The other end is hinged, the outer ends of the main control rod (6) and the auxiliary control rod (13) both extend out of the valve body (1) and are marked with an axial scale. The main control rod (6) and the auxiliary control rod (13) An adjusting nut (10) is connected to the middle of the fuselage; Sealing structure: including a packing seat (7) fixed on the wall of the valve body (1) and a gland (8) fitted with the packing seat (7), the gland (8) and the packing seat (7) are filled with packing (12); Limiting structure: including an end cover (9) fixedly connected with the end face of the packing seat (7), and a fixing piece (11) for limiting the axial movement of the adjusting nut (10) is inserted on the end cover (9); The main control rod (6) and the auxiliary control rod (13) extend out of the end cover (9) through the packing seat (7), and the adjusting nut (10) is located outside the end cover (9). 2. The connecting rod butterfly valve with a connecting rod adjusting mechanism according to claim 1, characterized in that: the other ends of the main adjusting rod (5) and the auxiliary adjusting rod (4) are provided with sliding grooves, and the A pin shaft connecting the main control rod (6) and the auxiliary control rod (13) is arranged in the chute. 3. The connecting rod butterfly valve with a connecting rod adjusting mechanism according to claim 1, wherein the end cover (9) is provided with a rectangular groove, and the outer end of the fixing plate (11) is provided with the end cover (9) In the rectangular sheet clamped by the upper rectangular groove, the inner end of the fixing sheet (11) is provided with a semicircular notch which is clamped into the cylindrical groove of the adjusting nut (10). 4. The connecting rod butterfly valve with a connecting rod adjusting mechanism according to claim 1, characterized in that: the outer side of the adjusting nut (10) has a sleeve with an integrated structure, and the outer edge of the sleeve is marked with each grid indicating 0.1mm The outer ends of the main control rod (6) and the auxiliary control rod (13) marked with the axial scale extend out of the sleeve. 5. The connecting rod butterfly valve with a connecting rod adjusting mechanism according to claim 1, characterized in that: the packing seat (7) has an inner cavity, and the gland (8) has a cylindrical shape matching with the inner cavity The filler (12) is located between the inner wall of the inner cavity and the cylindrical portion of the gland (8), and the filler (12) is an expanded graphite sealing filler that can withstand a high temperature of 600°C.

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