CN209892777U

CN209892777U - Symmetric double-disc valve

Info

Publication number: CN209892777U
Application number: CN201920460930.3U
Authority: CN
Inventors: 张韬; 卓剑平; 卓赞聪; 李朝领; 陈细民
Original assignee: Niu Tuoke Fluid Control Co Ltd
Current assignee: Niu Tuoke Fluid Control Co Ltd
Priority date: 2019-04-04
Filing date: 2019-04-04
Publication date: 2020-01-03
Anticipated expiration: 2029-04-04

Abstract

The utility model discloses a symmetrical double-disk disc valve, which comprises a left valve body, a left valve seat, a right valve body, a right valve seat, an intermediate, a rotating shaft, a valve head and a rotating rod; the valve head comprises a spring sleeve, a fixed block, a sliding block arranged in the spring sleeve and connected with the spring sleeve in a sliding manner, a valve disc sleeved at the end part of the spring sleeve, a butting head fixed on the side wall of the sliding block and a butting spring fixed between the fixed block and the sliding block; the abutting head is of a hemispherical structure, and the circular end surface of the abutting head is connected with the sliding block; the end face of the valve disc, which is far away from the spring sleeve, is attached to and abutted against the left valve seat and the right valve seat, and the inner wall of the valve disc is provided with an abutting groove of which the inner wall is attached to and abutted against the arc-shaped surface of the abutting head; the axis of the valve disc is coincident with the axis of the abutting groove, and the axis of the valve disc penetrates through the spherical center of the abutting head. The utility model discloses has following effect: the new mechanical structure of this scheme utilization for valve disc and disk seat laminating are airtight, prevent the interior fluidic leakage of valve body, have improved the job stabilization nature of this disc valve.

Description

Symmetric double-disc valve

Technical Field

The utility model relates to a valve field, in particular to symmetry double plate disc valve.

Background

The valve is widely applied to medium conveying pipelines in chemical production, and the disc valve drives the valve plate to move through the rotating shaft, so that the valve body is opened and closed.

At present, chinese utility model patent with publication number CN201810797U discloses a symmetrical double-disk disc valve with wear-resisting property for pipeline for conveying granular medium, including: the valve cavity, the left valve disc and the right valve disc respectively form sealing surfaces with the left valve seat and the right valve seat; the spring seat consists of a spring sleeve, a spring rod and a spring; the spring seats are located between the left valve disc and the right valve disc, the number of the spring rods is two, the spring rods are respectively provided with a large end and a small end, the two spring rods are respectively sleeved with a spring, the spring rods and the spring are all arranged in the spring sleeve, the large ends of the two spring rods respectively prop against the central holes of the left valve disc and the right valve disc under the jacking pressure of the spring, the two ends of the spring sleeve also stretch into the central holes of the left valve disc and the right valve disc and respectively leave gaps with the two central holes in the axial direction and the radial direction to enable the valve discs to rotate, and the tungsten carbide layer is integrally sprayed on the inner cavity of the valve body.

The big head end of spring lever offsets with the level and smooth inner wall of centre bore on the valve disc among the above-mentioned technical scheme to make valve disc and valve body support tight sealedly, nevertheless have following defect: the big end of the spring rod is spherical, so that the spring rod is in point contact with the valve disc when in contact with the valve disc, if the contact point of the big end and the valve disc is not overlapped with the axis of the valve disc, the acting force of the spring rod for tightly abutting the valve disc is uneven, a gap is formed between the valve disc and the sealing surface of the valve seat, and fluid leakage is caused. Therefore, a symmetric double-disc valve is needed, in which a valve disc and a valve seat are tightly attached to each other, so as to prevent the leakage of fluid in a valve body and improve the working stability of the disc valve.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims at providing a two dish disc valves of symmetry, the valve disc in this disc valve is airtight with the disk seat laminating, prevents the interior fluidic leakage of valve body, has improved the job stabilization nature of this disc valve.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a symmetrical double-disk disc valve comprises a left valve body communicated with a pipeline, a left valve seat fixed on the side wall of the left valve body far away from the pipeline and communicated with the left valve body, a right valve body communicated with the pipeline, a right valve seat fixed on the side wall of the right valve body near the left valve body and communicated with the right valve body, an intermediate body fixed between the left valve body and the right valve body, a rotating shaft penetrating through the right valve body and rotatably connected with the right valve body, a valve head arranged in the intermediate body and a rotating rod with one end fixed with the valve head and the other end fixed with the rotating shaft; the valve head comprises a spring sleeve which penetrates through the end part of the rotating rod far away from the rotating shaft and is fixed with the rotating rod, a fixed block arranged in the spring sleeve, a sliding block arranged in the spring sleeve and in sliding connection with the spring sleeve, a valve disc sleeved on the end part of the spring sleeve, a butting head fixed on the side wall of the sliding block close to the valve disc and a butting spring fixed between the fixed block and the sliding block; the abutting joint is of a hemispherical structure, and the circular end surface of the abutting joint is connected with the sliding block; the end face, far away from the spring sleeve, of the valve disc is attached to and abutted against the left valve seat and the right valve seat, and an abutting groove with an inner wall attached to and abutted against the arc-shaped surface of the abutting head is formed in the inner wall of the valve disc; the axis of the valve disc is coincident with the axis of the abutting groove, and the axis of the valve disc penetrates through the spherical center of the abutting head.

Through adopting above-mentioned technical scheme, when the butt spring stretches, it slides towards spring sleeve tip to have driven the sliding block, make the butt head that is fixed in on the sliding block support tightly with seting up the butt inslot wall on the valve disc inner wall, thereby make valve disc and left disk seat and right disk seat support tightly, and the surface of butt head and butt inslot wall butt is the arc, and the axis of valve disc is coincident with the axis in butt groove and passes the centre of sphere of butt head, make the effort of butt head to the valve disc more even, make the laminating of valve disc and left disk seat and right disk seat more even, prevent that the sealed face of valve disc and disk seat from appearing the clearance, fluid leakage has effectively been avoided, the job stabilization nature of this disc valve has been improved.

The utility model is further arranged in such a way that a left arc-shaped ring is fixed on the side wall of the left valve body close to the valve disc, and the valve disc on the spring sleeve close to the left valve body is arranged in the left arc-shaped ring and is connected with the inner wall of the left arc-shaped ring in a sliding way; and the side wall of the right valve body, which is close to the valve disc, is fixedly provided with a right arc-shaped ring, and the valve disc, which is close to the right valve body, on the spring sleeve is arranged in the right arc-shaped ring and is in sliding connection with the inner wall of the right arc-shaped ring.

Through adopting above-mentioned technical scheme, when the axis of rotation rotates, the dwang in the intermediate body has been driven and has been rotated for the valve head removes, thereby the switching of left valve body and right valve body has been realized, and when the valve head removed, the spring sleeve drove the valve disc and removes, make the valve disc slide in left arc circle and right arc circle, stability when being favorable to guaranteeing the valve head and removing, prevent that valve disc and spring sleeve from breaking away from.

The utility model discloses further set up to, the cover is equipped with first isolated cover on the spring sleeve, first isolated cover one end with the valve disc is close to the terminal surface of dwang is fixed and sealed, the other end with the dwang is close to the lateral wall of valve disc is fixed and sealed.

Through adopting above-mentioned technical scheme, on spring sleeve was located to first isolated ways, and its one end was fixed and sealed with the valve disc terminal surface, and the other end was fixed and sealed with the dwang lateral wall for spring sleeve and valve disc open-ended junction and middle internal isolated are favorable to preventing in the fluid entering spring sleeve of middle internal, have improved the job stabilization nature of valve head.

The utility model is further arranged that the fixed block is connected with the inner wall of the spring sleeve in a sliding way, and the side wall of the fixed block, which is far away from the sliding block, inclines towards the direction far away from the rotating shaft; the valve head is also provided with an adjusting part for adjusting the compression amount of the abutting spring, and the adjusting part comprises an adjusting bolt which sequentially penetrates through the rotating rod and the inner wall of the spring sleeve and is in threaded connection with the spring sleeve and an adjusting block which is arranged in the spring sleeve and is in rotary connection with the end part of the adjusting bolt; the adjusting block is close to the side wall of the fixed block, inclines and is attached to and abutted against the inclined side wall of the fixed block.

Through adopting above-mentioned technical scheme, when adjusting bolt rotated, adjusting bolt tip removed for the regulating block who rotates to connect in the adjusting bolt tip slides along the slope lateral wall of fixed block, thereby has driven the fixed block and has slided in the spring sleeve, makes the one end of butt spring coupling fixed block remove, has adjusted the decrement of butt spring, and then has adjusted the effort size of butt head butt valve disc, makes this disc valve satisfy the fluidic sealed condition of different pressures.

The utility model discloses further set up to, seted up on the midbody the axis with the regulation hole of adjusting bolt axis coincidence, regulation hole female connection has and is used for sealing the sealing bolt of regulation hole.

By adopting the technical scheme, the debugging personnel unscrew the sealing bolt, and then use tools such as an inner hexagonal wrench and the like to pass through the adjusting hole so as to rotate the adjusting bolt, so that the adjustment is convenient.

The utility model discloses further set up to, the cover is equipped with seal ring on the sealing bolt.

By adopting the technical scheme, when the sealing bolt is screwed tightly, the sealing washer is tightly propped between the head of the adjusting bolt and the outer wall of the intermediate body, so that the fluid in the intermediate body is prevented from leaking out of the adjusting hole.

The utility model is further arranged in that a rotating hole for passing through the rotating shaft is arranged on the right valve body, and a rotating sleeve which is sleeved on the rotating shaft and is rotationally connected with the rotating shaft is fixed in the rotating hole; one end of the rotating shaft is connected with the driver, and the other end of the rotating shaft is connected with the side wall of the intermediate body in a rotating mode.

Through adopting above-mentioned technical scheme, the axis of rotation passes the cover of rotating fixed with the right valve body and rotates with the cover and be connected to make axis of rotation and right valve body rotate and be connected.

The utility model is further arranged in that a sealing part for sealing the rotating shaft and the rotating sleeve is arranged on the rotating shaft, and the sealing part comprises a sealing pressing ring which is sleeved on the rotating shaft and is positioned between the rotating shaft and the rotating sleeve, a sealing spring which is fixed between the sealing pressing ring and the rotating sleeve and a second isolating sleeve which is fixed between the sealing pressing ring and the rotating sleeve; the second isolation sleeve is sleeved on the rotating shaft, and two ends of the second isolation sleeve are sealed; the end face of the rotating sleeve is far away from the sealing pressing ring, and the side wall of the rotating rod, which is close to the rotating sleeve, is attached and abutted tightly.

Through adopting above-mentioned technical scheme, when the axis of rotation rotated, the dwang rotated, sealed clamping ring supported tightly with the dwang lateral wall this moment, and the isolated cover of second was located in the axis of rotation for the junction of rotating sleeve and axis of rotation is isolated with the internal fluid in middle part, prevents that the internal fluid in middle part from flowing out right valve body between axis of rotation and the rotating sleeve.

To sum up, the utility model discloses a beneficial technological effect does:

1. when the abutting spring stretches, the sliding block slides towards the end part of the spring sleeve, so that the abutting head fixed on the sliding block abuts against the inner wall of an abutting groove formed in the inner wall of the valve disc, the valve disc abuts against the left valve seat and the right valve seat, the abutting surface of the abutting head and the inner wall of the abutting groove is arc-shaped, the axis of the valve disc is superposed with the axis of the abutting groove and penetrates through the spherical center of the abutting head, the acting force of the abutting head on the valve disc is more uniform, the valve disc is more uniformly attached to the left valve seat and the right valve seat, a gap is prevented from being formed between the sealing surface of the valve disc and the sealing surface of the valve seat, fluid leakage is effectively avoided, and the working stability of;

2. when the adjusting bolt rotates, the adjusting block rotatably connected to the end part of the adjusting bolt slides along the inclined side wall of the fixed block, so that the fixed block is driven to slide in the spring sleeve, one end of the abutting spring connected with the fixed block moves, the compression amount of the abutting spring is adjusted, the acting force of the abutting head abutting against the valve disc is adjusted, and the disc valve meets the sealing conditions of fluids with different pressures;

3. the sealing pressing ring is tightly abutted to the side wall of the rotating rod, and the second isolating sleeve is arranged on the rotating shaft, so that the connecting part of the rotating sleeve and the rotating shaft is isolated from fluid in the middle body, and the fluid in the middle body is prevented from flowing out of the right valve body between the rotating shaft and the rotating sleeve.

Drawings

FIG. 1 is a schematic view of the overall structure of the embodiment;

fig. 2 is a schematic diagram of the structure at a in fig. 1.

In the figure: 1. a left valve body; 11. a first communication hole; 12. a left connecting pipe; 13. a left attachment flange; 14. a left arc-shaped ring; 2. a left valve seat; 3. a right valve body; 31. a second communication hole; 32. a right connecting pipe; 33. a right connecting flange; 34. rotating the hole; 35. a right arc-shaped ring; 4. a right valve seat; 5. an intermediate; 51. an adjustment hole; 52. a seal bolt; 53. a sealing gasket; 6. rotating the sleeve; 61. a sealing retainer ring; 7. a rotating shaft; 71. a sealing part; 72. sealing the pressing ring; 73. a seal spring; 74. a second insulating sleeve; 8. rotating the rod; 9. a valve head; 91. a spring sleeve; 911. a first insulating sleeve; 92. a fixed block; 93. a slider; 94. a valve disc; 941. mounting grooves; 942. a butt joint groove; 95. a butting head; 96. an abutment spring; 97. an adjustment section; 971. adjusting the bolt; 972. and a regulating block.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, a symmetric double-disk disc valve comprises a left valve body 1, a left valve seat 2, a right valve body 3, a right valve seat 4, an intermediate body 5, a rotating sleeve 6, a rotating shaft 7, a rotating rod 8 and a valve head 9. The left valve body 1 is in a circular plate shape, and a first through hole 11 is formed in a side wall thereof, and a left connecting pipe 12 and a left connecting flange 13 are arranged thereon. The first communication hole 11 is circular in cross section and has an axis coincident with the axis of the left valve body 1. The left connecting pipe 12 is in a circular tubular shape, one end of the left connecting pipe is welded and fixed with the side wall of the left valve body 1, and the axis of the left connecting pipe coincides with the axis of the first connecting hole 11, so that the left connecting pipe 12 is communicated with the side wall of the left valve body 1. The left connecting flange 13 is circular and annular, the axis of the left connecting flange is overlapped with the axis of the left connecting pipe 12, and the left connecting flange 13 and one end of the left connecting pipe 12 far away from the left valve body 1 are welded and fixed for installing and fixing the left valve body 1 and a fluid pipeline. The left valve seat 2 is annular, is made of high-hardness integrally sintered tungsten carbide, is embedded on the side wall of the left valve body 1 far away from the left connecting pipe 12 and is flush with the side wall, and the axis of the left valve seat 2 coincides with the axis of the first connecting hole 11.

As shown in fig. 1, the right valve body 3 is a circular plate, and has a sidewall provided with a second communication hole 31, a right connection pipe 32 and a right connection flange 33. The second communication hole 31 has a circular cross section and its axis coincides with the axis of the right valve body 3. The right connecting pipe 32 is in a circular pipe shape, one end of which is welded and fixed to the side wall of the right valve body 3, and the axis of which coincides with the axis of the second communicating hole 31, so that the right connecting pipe 32 communicates with the side wall of the right valve body 3. The right connecting flange 33 is circular and annular, the axis of the right connecting flange 33 coincides with the axis of the right connecting pipe 32, and the right connecting flange 33 and one end of the right connecting pipe 32 far away from the right valve body 3 are welded and fixed for installing and fixing the right valve body 3 and a fluid pipeline. The right valve seat 4 is annular, is made of high-hardness integrally sintered tungsten carbide, is embedded on the side wall of the right valve body 3 far away from the right connecting pipe 32 and is flush with the side wall, and the axis of the right valve seat 4 is superposed with the axis of the second communicating hole 31. The intermediate body 5 is a circular tubular shell, the axis of the circular tubular shell is parallel to the axis of the left valve body 1, and the end faces of the two ends of the intermediate body 5 are respectively welded and fixed with the side walls of the left valve body 1 and the right valve body 3.

As shown in fig. 1, a rotating hole 34 is formed in a side wall of the right valve body 3 close to the intermediate body 5, the cross section of the rotating hole 34 is circular, and an axis of the rotating hole passes through the inside of the intermediate body 5. The rotating sleeve 6 is in a circular tube shape and is arranged in the rotating hole 34, and the outer wall of the rotating sleeve is welded and fixed with the inner wall of the rotating hole 34. And sealing check rings 61 are arranged at two ends of the rotating sleeve 6, the sealing check rings 61 are of ring-shaped structures, the end surfaces of the sealing check rings are fixed with the end surface of the rotating sleeve 6, and the end surfaces of the sealing check rings, which are connected with the rotating sleeve 6, are welded and fixed with the side walls of two sides of the right valve body 3. The section of the rotating shaft 7 is circular, one end of the rotating shaft is connected with the driver, the other end of the rotating shaft penetrates through the rotating sleeve 6 and is rotatably connected with the side wall, close to the intermediate body 5, of the left valve body 1, and the rotating shaft 7 is rotatably connected with the inner wall of the rotating sleeve 6. The dwang 8 is the shaft-like structure that the cross-section is the rectangle, and it sets up in midbody 5, and axis of rotation 7 passes dwang 8 one end lateral wall and fixed with dwang 8. The rotating shaft 7 is provided with a sealing portion 71, and the sealing portion 71 includes a sealing pressing ring 72, a sealing spring 73 and a second insulating sleeve 74. The sealing pressing ring 72 is annular, is arranged in the intermediate body 5 and is positioned on one side of the rotating rod 8 close to the right valve body 3, and the sealing pressing ring 72 is sleeved on the rotating shaft 7. In addition, the seal pressing ring 72 and the rotating lever 8 are both made of high-hardness integrally sintered tungsten carbide. The sealing spring 73 is sleeved on the rotating shaft 7, one end of the sealing spring is fixed with the end face of the sealing pressing ring 72 close to the right valve body 3, and the other end of the sealing spring is fixed with the end face of the sealing check ring 61 close to the rotating rod 8. The second isolation sleeve 74 is in a circular tube shape and made of an elastic rubber material, and is fixed and sealed with the end face of the sealing pressing ring 72 close to the right valve body 3, and the other end of the sealing pressing ring 61 close to the end face of the rotating rod 8, and when the sealing spring 73 extends, the sealing washer 53 and the side wall of the rotating rod 8 close to the right valve body 3 are abutted tightly, so that the connection between the rotating shaft 7 and the rotating sleeve 6 is isolated from the inside of the intermediate body 5.

As shown in fig. 1 and 2, the valve head 9 includes a spring sleeve 91, a fixed block 92, a slide block 93, a valve disc 94, an abutment head 95, an abutment spring 96, and an adjustment portion 97. The spring sleeve 91 is in a circular tube shape, the axis of the spring sleeve coincides with the axis of the first communication hole 11, and the spring sleeve passes through the side wall of one end of the rotating rod 8 far away from the rotating shaft 7 and is fixed with the rotating rod 8. The fixing block 92 is a circular block, which is disposed in the spring sleeve 91 and slidably connected to the inner wall of the spring sleeve 91, and the sidewall of the fixing block near the middle of the spring sleeve 91 is inclined toward the direction away from the rotating shaft 7. The two fixing blocks 92 are provided, and the two fixing blocks 92 are symmetrically arranged with respect to a bisector of the spring sleeve 91 parallel to the length direction of the rotating lever 8. The sliding blocks 93 are circular blocks, are arranged in the spring sleeve 91 and are in sliding connection with the inner wall of the spring sleeve 91, the two sliding blocks 93 are arranged, and the two sliding blocks 93 are respectively arranged at two ends of the spring sleeve 91. The valve disc 94 is in a circular table shape, a mounting groove 941 is formed in a smaller end face of the valve disc, the cross section of the mounting groove 941 is circular, the axis of the mounting groove 941 coincides with the axis of the valve disc 94, and the valve disc 94 is sleeved on the end portion of the spring sleeve 91 and is in sliding connection with the end portion of the spring sleeve. The valve disc 94 is made of high-hardness integrally sintered tungsten carbide, the end face of the valve disc, which is far away from the spring sleeve 91, is attached to and abutted against the end faces of the left valve seat 2 and the right valve seat 4, and a certain gap is formed between the circular inner wall of the mounting groove 941 on the valve disc 94 and the spring sleeve 91. In addition, the spring sleeve 91 is externally sleeved with a first isolation sleeve 911, the first isolation sleeve 911 is in a circular tube shape and made of elastic rubber material, one end of the first isolation sleeve 911 is fixed and sealed with the end surface of the valve disc 94 close to the spring sleeve 91, and the other end of the first isolation sleeve 911 is fixed and sealed with the side wall of the rotating rod 8 close to the valve disc 94; the abutting head 95 is a hemisphere, the circular surface of the abutting head is fixed to the surface of the sliding block 93 away from the fixed block 92, an abutting groove 942 is formed on the circular inner wall of the mounting groove 941, and the abutting groove 942 is a spherical groove. The abutting spring 96 is fixed between the sliding block 93 and the fixed block 92, and the axis of the abutting spring 96 passes through the spherical center of the abutting head 95 and coincides with the axis of the valve disc 94, so that when the abutting spring 96 is expanded, the sliding block 93 slides towards the end of the spring sleeve 91, so that the arc-shaped surface of the abutting head 95 is attached to and abutted against the arc-shaped inner wall of the abutting groove 942, and the valve disc 94 is abutted against the left valve seat 2 and the right valve seat 4. The adjusting portion 97 includes an adjusting bolt 971 and an adjusting block 972, the adjusting bolt 971 is a hexagon socket head cap screw, and the end portion thereof sequentially passes through the end surface of the rotating rod 8 away from the rotating shaft 7 and the outer wall of the spring sleeve 91 and is in threaded connection with the spring sleeve 91. The adjusting block 972 is disposed at the middle position in the spring sleeve 91, is rotatably connected to the end of the adjusting bolt 971, and is inclined near the side walls of the two fixing blocks 92 at the two sides and respectively fits and abuts against the inclined side walls of the two fixing blocks 92.

As shown in fig. 1 and 2, a left arc-shaped ring 14 is fixed on the side wall of the left valve body 1 close to the intermediate body 5, the arc-shaped surrounding center of the left arc-shaped ring 14 coincides with the rotation axis 7 of the rotation axis 7, the frame thereof is rectangular, and a valve disc 94 close to the left valve body 1 is arranged in the left arc-shaped ring 14 and is connected with the inner wall of the left arc-shaped ring 14 in a sliding manner. And a right arc-shaped ring 35 is fixed on the side wall of the right valve body 3 close to the intermediate body 5, the arc-shaped surrounding center of the right arc-shaped ring 35 coincides with the line of the rotating shaft 7, the frame of the right arc-shaped ring is rectangular, and a valve disc 94 close to the right valve body 3 is arranged in the right arc-shaped ring 35 and is in sliding connection with the inner wall of the right arc-shaped ring 35. The outer wall of the intermediate body 5 is provided with an adjusting hole 51, the cross section of the adjusting hole 51 is circular, the axis of the adjusting hole coincides with the axis of the adjusting bolt 971, and a sealing bolt 52 and a sealing washer 53 are arranged in the adjusting hole 51. The end of the sealing bolt 52 passes through the adjusting hole 51 and is in threaded connection with the inner wall of the adjusting hole 51, the sealing washer 53 is annular and made of elastic rubber material, and is sleeved on the sealing bolt 52 and arranged outside the intermediate body 5, so that when the sealing bolt 52 is screwed, the sealing washer 53 is abutted between the head of the sealing bolt 52 and the outer wall of the intermediate body.

When the valve is used, the surface of the abutting head 95 abutting against the inner wall of the abutting groove 942 is arc-shaped, the axis of the valve disc 94 is overlapped with the axis of the abutting groove 942 and penetrates through the center of the abutting head 95, so that the acting force of the abutting head 95 on the valve disc 94 is more uniform, the valve disc 94 is more uniformly attached to the left valve seat 2 and the right valve seat 4, a gap is prevented from occurring between the valve disc 94 and the sealing surface of the valve seats, the leakage of fluid is effectively avoided, and the working stability of the valve is improved.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a symmetry double plate disc valve, include left valve body (1) with the pipeline intercommunication, be fixed in left valve body (1) keep away from on the lateral wall of pipeline and with left valve body (1) left disk seat (2) of intercommunication, right valve body (3) with the pipeline intercommunication, be fixed in right valve body (3) be close to on the lateral wall of left valve body (1) and with right disk seat (4) of right valve body (3) intercommunication, be fixed in midbody (5) between left valve body (1) and right valve body (3), pass right valve body (3) and rotate axis of rotation (7) of being connected with it, set up valve head (9) and one end and fixed other end of valve head (9) in midbody (5) and axis of rotation (7) fixed dwang (8), characterized by: the valve head (9) comprises a spring sleeve (91) which penetrates through the end part of the rotating rod (8) far away from the rotating shaft (7) and is fixed with the rotating rod, a fixed block (92) arranged in the spring sleeve (91), a sliding block (93) arranged in the spring sleeve (91) and in sliding connection with the spring sleeve, a valve disc (94) sleeved on the end part of the spring sleeve (91), a butting head (95) fixed on the side wall of the sliding block (93) close to the valve disc (94) and a butting spring (96) fixed between the fixed block (92) and the sliding block (93); the abutting joint head (95) is of a hemispherical structure, and the circular end surface of the abutting joint head is connected with the sliding block (93); the end face, far away from the spring sleeve (91), of the valve disc (94) is attached to and abutted against the left valve seat (2) and the right valve seat (4), and an abutting groove (942) with an inner wall attached to and abutted against the arc-shaped surface of the abutting head (95) is formed in the inner wall of the valve disc (94); the axis of the valve disc (94) is coincident with the axis of the abutting groove (942), and the axis of the valve disc (94) passes through the spherical center of the abutting head (95).

2. A symmetric dual disc valve according to claim 1 wherein: a left arc-shaped ring (14) is fixed on the side wall of the left valve body (1) close to the valve disc (94), and the valve disc (94) on the spring sleeve (91) close to the left valve body (1) is arranged in the left arc-shaped ring (14) and is in sliding connection with the inner wall of the left arc-shaped ring (14); and a right arc-shaped ring (35) is fixed on the side wall of the right valve body (3) close to the valve disc (94), and the valve disc (94) on the spring sleeve (91) close to the right valve body (3) is arranged in the right arc-shaped ring (35) and is in sliding connection with the inner wall of the right arc-shaped ring (35).

3. A symmetric dual disc valve according to claim 2 wherein: spring sleeve (91) are gone up the cover and are equipped with first isolated cover (911), first isolated cover (911) one end with valve disc (94) are close to the terminal surface of dwang (8) is fixed and sealed, the other end with dwang (8) are close to the lateral wall of valve disc (94) is fixed and sealed.

4. A symmetric dual disc valve according to claim 1 wherein: the fixed block (92) is connected with the inner wall of the spring sleeve (91) in a sliding mode, and the side wall, away from the sliding block (93), of the fixed block inclines towards the direction away from the rotating shaft (7); the valve head (9) is also provided with an adjusting part (97) for adjusting the compression amount of the abutting spring (96), and the adjusting part (97) comprises an adjusting bolt (971) which sequentially penetrates through the rotating rod (8) and the inner wall of the spring sleeve (91) and is in threaded connection with the spring sleeve (91) and an adjusting block (972) which is arranged in the spring sleeve (91) and is in rotating connection with the end part of the adjusting bolt (971); the adjusting block (972) is close to the side wall inclination of the fixing block (92) and is attached to and abutted against the inclined side wall of the fixing block (92).

5. A symmetric dual disc valve according to claim 4 wherein: an adjusting hole (51) with the axis coincident with the axis of the adjusting bolt (971) is formed in the intermediate body (5), and a sealing bolt (52) used for sealing the adjusting hole (51) is connected to the inner thread of the adjusting hole (51).

6. A symmetric dual disc valve according to claim 5 wherein: and a sealing gasket (53) is sleeved on the sealing bolt (52).

7. A symmetric dual disc valve according to claim 1 wherein: a rotating hole (34) used for penetrating through the rotating shaft (7) is formed in the right valve body (3), and a rotating sleeve (6) sleeved on and rotatably connected with the rotating shaft (7) is fixedly arranged in the rotating hole (34); one end of the rotating shaft (7) is connected with the driver, and the other end of the rotating shaft is connected with the left valve body (1) and the side wall of the intermediate body (5) is rotatably connected.

8. A symmetric dual disc valve according to claim 7 wherein: the rotating shaft (7) is provided with a sealing part (71) for sealing the rotating shaft (7) and the rotating sleeve (6), and the sealing part (71) comprises a sealing pressing ring (72) which is sleeved on the rotating shaft (7) and is positioned between the rotating shaft (8) and the rotating sleeve (6), a sealing spring (73) which is fixed between the sealing pressing ring (72) and the rotating sleeve (6) and a second isolating sleeve (74) which is fixed between the sealing pressing ring (72) and the rotating sleeve (6); the second isolation sleeve (74) is sleeved on the rotating shaft (7), and two ends of the second isolation sleeve are sealed; the end face of the sealing pressing ring (72) far away from the rotating sleeve (6) is attached to and abutted against the side wall of the rotating rod (8) close to the rotating sleeve (6).