CN218093798U

CN218093798U - Screw connection structure

Info

Publication number: CN218093798U
Application number: CN202222020318.9U
Authority: CN
Inventors: 王鹏亮; 金鼎铭; 邱希望
Original assignee: Suzhou Eulerturbo Machinery Co ltd
Current assignee: Suzhou Eulerturbo Machinery Co ltd
Priority date: 2022-08-02
Filing date: 2022-08-02
Publication date: 2022-12-20
Anticipated expiration: 2032-08-02

Abstract

The utility model discloses a screw connection structure, include: the compressor spiral case, one first screw is no less than to the quantity, one shaft end sealing member is no less than to the quantity of second screw that one is no less than to the quantity, be provided with the cylindricality countersunk head screw hole on the compressor spiral case, the first root of first screw can screw in the cylindricality countersunk head screw hole, the first head height of first screw is less than the counter bore degree of depth of cylindricality countersunk head screw hole, the second screw includes that a second root that has the external screw thread and a diameter are greater than the second head of second root, the outer wall of compressor spiral case is hugged closely to the bottom of shaft end sealing member, the internal diameter of through-hole is greater than or equal to the diameter of second root, the top surface of shaft end sealing member can be hugged closely to the bearing surface of second head behind second root screw in second screw hole, the diameter of second root is less than the diameter of first root. The utility model discloses the leakproofness is good, replaceability is high and reduce the compressor spiral case internal thread loss.

Description

Screw connection structure

Technical Field

The utility model relates to a connection structure especially relates to a screw connection structure.

Background

In modern production, the volute and the shaft end sealing part of an industrial compressor often work in a severe environment, are inevitably corroded and abraded under the action of high flow rate or high corrosive media, the shaft end sealing part needs to be replaced regularly, the volute and the shaft end sealing part are usually fixed by using screws, in the conventional structure, internal threads used for connecting the shaft end sealing part on the volute usually contact with working media and are easily washed or corroded and damaged, and in addition, the shaft end sealing part is a vulnerable part, so that the thread abrasion failure is easily caused when the shaft end sealing part is replaced for multiple times, and the difficulty is easily brought to the daily maintenance work of equipment.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects, the utility model provides a screw connection structure, this screw connection structure have that the leakproofness is good, replaceability is high and reduce compressor spiral case internal thread loss's advantage.

The utility model discloses a solve the technical scheme that its technical problem adopted and be: a screw connection structure comprising: the compressor volute, at least one first screw, at least one second screw and at least one shaft end sealing element are arranged on the compressor volute, a cylindrical countersunk head threaded hole is formed in the compressor volute, the first screw is a cylindrical head screw and comprises a first root with external threads and a first head with the diameter larger than that of the first root, the diameter of the first head is smaller than the inner diameter of a countersunk hole of the cylindrical countersunk head threaded hole, a groove used for connecting a wrench is formed in the axis of the top end of the first head of the first screw, a second threaded hole is formed in the bottom of the groove along the axis, the first root of the first screw can be screwed into the cylindrical countersunk head threaded hole, the bearing surface of the first head can be tightly attached to the bottom surface of the counter bore of the cylindrical countersunk head threaded hole after the first root is screwed into the cylindrical countersunk head threaded hole, the height of the first head of the first screw is smaller than the depth of the counter bore of the cylindrical countersunk head threaded hole, a through hole is arranged in the shaft end sealing element in a penetrating mode, the second screw comprises a second root with an external thread and a second head with a diameter larger than that of the second root, the bottom end of the shaft end sealing element is tightly attached to the outer wall of the compressor volute, the inner diameter of the through hole is larger than or equal to that of the second root, the second root can penetrate through the through hole and then is screwed into the second threaded hole, the bearing surface of the second head can be tightly attached to the top surface of the shaft end sealing element after the second root is screwed into the second threaded hole, and the diameter of the second root is smaller than that of the first root.

Optionally, the first screw and the second screw are both flat socket hexagon socket head cap head screws.

Optionally, the sealing device further comprises at least one radial sealing ring, a sealing groove is formed in the middle section of the first head portion in a circumferential direction, the radial sealing ring is elastic, an inner ring of the radial sealing ring can be clamped into the sealing groove, the diameter of an outer ring of the radial sealing ring is larger than the inner diameter of a counter bore of the cylindrical counter bore threaded hole, the inner ring of the radial sealing ring can be tightly attached to the bottom wall of the sealing groove after the first root is screwed into the cylindrical counter bore threaded hole, and the outer ring of the radial sealing ring can be tightly attached to the inner wall of the counter bore of the cylindrical counter bore threaded hole.

Optionally, the vertical distance from the inner wall of the counter bore of the cylindrical counter bore threaded hole to the first head of the first screw is 0.1mm to 0.15mm.

Optionally, the first screw and the compressor volute are fixed by welding after being matched by threads.

The utility model has the beneficial technical effects that: the screw connection structure includes: the compressor volute casing, the quantity is no less than one first screw, the quantity is no less than one second screw and the quantity is no less than one shaft end sealing element, first, the first root of the first screw is screwed into a cylindrical countersunk head threaded hole on the compressor volute casing, because the first screw is a cylindrical head screw, and the height of the first head is less than the countersunk depth of the cylindrical countersunk head threaded hole, after the first root of the first screw is screwed into the cylindrical countersunk head threaded hole, the first head of the first screw cannot be higher than the countersunk hole of the cylindrical countersunk head threaded hole, because the first head of the first screw is provided with the second threaded hole, the second root of the second screw is screwed into the second threaded hole after penetrating out of a through hole of the shaft end sealing element, the shaft end sealing element is compressed to fix the shaft end sealing element, when the shaft end sealing element needs to be replaced by the second screw after the second screw is screwed out, when the internal thread of the second threaded hole on the first screw is seriously worn, the replacement of the first screw can be completed only by replacing the first screw, the replacement of the replacement screw, the external screw can be better used for the external sealing element, and the external screw can be better. The compressor volute has the advantages of good sealing performance, high replaceability and reduction of the loss of the internal threads of the compressor volute.

Drawings

FIG. 1 is an overall sectional view of the present invention;

FIG. 2 is a cross-sectional view of the compressor volute of the present invention;

fig. 3 is a cross-sectional view of a first screw of the present invention;

fig. 4 is a cross-sectional view of the shaft end seal of the present invention;

fig. 5 is a cross-sectional view of a second screw of the present invention;

wherein:

1. a compressor volute; 11. A cylindrical countersunk head threaded hole; 2. A first screw;

21. a first root portion; 22. A first head portion; 23. A second threaded hole;

24. a sealing groove; 3. A second screw; 31. A second root portion;

32. a second head; 4. A shaft end seal; 41. A through hole;

5. and a radial sealing ring.

Detailed Description

In order to make the technical means of the present invention clearer and to make the invention practical in accordance with the content of the specification, the following embodiments are described in further detail with reference to the accompanying drawings and examples, and the following examples are used to illustrate the present invention but do not limit the scope of the present invention.

The present embodiment describes in detail a screw connection structure according to the present application, and as shown in fig. 1 to 5, the screw connection structure includes: compressor spiral case 1, the quantity is no less than one first screw 2, the quantity is no less than one second screw 3 and the quantity is no less than one shaft end sealing member 4, be provided with cylindricality countersunk head screw hole 11 on the compressor spiral case 1, cylindricality countersunk head screw hole 11 in this embodiment is the screw hole that has a cylindrical countersunk head at the top, first screw 2 is the cylindricality cap screw, first screw 2 includes a first root 21 that has the external screw thread and a diameter is greater than first head 22 of first root 21, the diameter of first head 22 is less than the counter bore internal diameter of cylindricality countersunk head screw hole 11. The top axle center department of the first head 22 of first screw 2 offers the recess that is used for connecting the wrench, the bottom of recess is provided with a second screw hole 23 along the axle center, first root 21 of first screw 2 can screw in the cylindricality countersunk head screw hole 11, the counter bore bottom surface of cylindricality countersunk head screw hole 11 can be hugged closely to the bearing face of first head 22 behind first root 21 screw in cylindricality countersunk head screw hole 11, the bearing face in this matter example refers to the one side that the screw head hugged closely with by the mounting, the first head 22 of first screw 2 highly is less than the counter bore degree of depth of cylindricality countersunk head screw hole 11. The shaft end sealing element 4 is provided with a through hole 41 in a penetrating way, the second screw 3 comprises a second root part 31 with external threads and a second head part 32 with the diameter larger than that of the second root part 31, the bottom end of the shaft end sealing element 4 is tightly attached to the outer wall of the compressor volute 1, and the inner diameter of the through hole 41 is larger than or equal to that of the second root part 31. The second root portion 31 can penetrate through the through hole 41 and then be screwed into the second threaded hole 23, when the second root portion 31 is screwed into the second threaded hole 23, the bearing surface of the second head portion 32 can be tightly attached to the top surface of the shaft end sealing member 4, and the diameter of the second root portion 31 is smaller than that of the first root portion 21. When in use, the first root 21 of the first screw 2 is firstly screwed into the cylindrical countersunk head threaded hole 11 on the compressor volute 1, and since the first screw 2 is a cylindrical head screw and the height of the first head 22 is smaller than the countersunk depth of the cylindrical countersunk head threaded hole 11, the first root 21 of the first screw 2 is screwed into the cylindrical countersunk head threaded hole 11. The first head 22 of the first screw 2 is not higher than the counter bore of the cylindrical counter bore threaded hole 11, and because the first head 21 of the first screw 2 is provided with the second threaded hole 23, the second root 31 of the second screw 3 is screwed into the second threaded hole 23 after penetrating out of the through hole 41 of the shaft end sealing element 4, and the shaft end sealing element 4 is pressed tightly to fix the shaft end sealing element 4. When the shaft end sealing element 4 needs to be replaced, the second screw 3 is screwed up again only after the second screw 3 is screwed out to replace a new shaft end sealing element 4, and when the internal thread of the second threaded hole 23 of the first screw 2 is seriously worn after multiple replacement operations, the replacement of the second threaded hole 23 can be completed only by replacing the first screw 2, so that the use frequency of the internal thread of the cylindrical countersunk head threaded hole 11 of the compressor volute 1 is reduced, and the loss is reduced. In addition, the first screw 2 is covered by the shaft end sealing element 4 and is not exposed to the outside, so that the sealing performance of the application is better. The compressor volute has the advantages of good sealing performance, high replaceability and reduction of the loss of the internal thread of the compressor volute.

Optionally, in this embodiment, the first screw 2 and the second screw 3 are both flat socket hexagon socket head cap screws, where the flat socket in this embodiment refers to that the socket of the screw is a plane, that is, the surface tightly attached to the surface of the fixed component, and the socket head cap screws in this embodiment refer to that the head of the screw is cylindrical.

In this embodiment, optionally, the sealing device further includes at least one radial seal ring 5, a seal groove 24 is circumferentially arranged in the middle section of the first head 22, the radial seal ring 5 has elasticity, an inner ring of the radial seal ring 5 can be clamped into the seal groove 24, the diameter of an outer ring of the radial seal ring 5 is larger than the inner diameter of a counterbore of the cylindrical countersunk head threaded hole 11, when the first root 21 is screwed into the cylindrical countersunk head threaded hole 11, the inner ring of the radial seal ring 5 can be tightly attached to the bottom wall of the seal groove 24, and an outer ring of the radial seal ring 5 can be tightly attached to the inner wall of the counterbore of the cylindrical countersunk head threaded hole 11, in this embodiment, the radial seal ring 5 is a common O-shaped rubber seal ring on the market, in some optional embodiments, the first screw 2 can be transformed by an existing conventional screw on the market, and due to the use of the radial seal ring 5, a seal is formed between the first head 22 and the inner wall of the counterbore of the cylindrical countersunk head threaded hole 11, so that a medium is not easily permeated from a gap between the first head 22 and the inner wall of the cylindrical countersunk head threaded hole 11, thereby causing corrosion or erosion of the internal thread of the cylindrical countersunk head threaded hole 11.

Optionally, in this embodiment, the vertical distance from the inner wall of the counterbore of the cylindrical countersunk head threaded hole 11 to the first head 22 of the first screw 2 is 0.1mm to 0.15mm.

In this embodiment, optionally, the first screw 2 and the compressor volute 1 may be fixed by welding after being screwed, and when the compressor volute 1 is used, a gap between the top of the first screw 2 and the compressor volute 1 may be fixed by welding after being screwed, so that the fixing is more reliable, and when the first screw 2 needs to be replaced, the first screw 2 may be replaced only by destroying a portion of a welding point.

The screw connection structure in the embodiment has the advantages of good sealing performance, high replaceability and reduction of the loss of the thread in the volute of the compressor.

Claims

1. A screw connection structure, characterized by comprising: the compressor volute (1), at least one first screw (2), at least one second screw (3) and at least one shaft end sealing element (4), wherein the compressor volute (1) is provided with a cylindrical countersunk head threaded hole (11), the first screw (2) is a cylindrical head screw, the first screw (2) comprises a first root (21) with external threads and a first head (22) with a diameter larger than that of the first root (21), the diameter of the first head (22) is smaller than that of the cylindrical countersunk head threaded hole (11), a groove for connecting a wrench is formed in the top end axle center of the first head (22) of the first screw (2), a second threaded hole (23) is formed in the bottom of the groove along the axle center, the first root (21) of the first screw (2) can be screwed into the cylindrical countersunk head threaded hole (11), the bearing surface of the first head (22) can be tightly attached to the bottom surface of the cylindrical countersunk head threaded hole (11) after the first root (21) is screwed into the cylindrical countersunk head threaded hole (11), the first head (22) can be screwed into the cylindrical countersunk head threaded hole (31), the first countersunk head threaded hole (31) of the first screw (31) and the second countersunk head threaded hole (31) is larger than that the diameter of the first threaded hole (31), the bottom end of the shaft end sealing element (4) is tightly attached to the outer wall of the compressor volute (1), the inner diameter of the through hole (41) is larger than or equal to the diameter of the second root part (31), the second root part (31) can penetrate out of the through hole (41) and then is screwed into the second threaded hole (23), when the second root part (31) is screwed into the second threaded hole (23), the bearing surface of the second head part (32) can be tightly attached to the top surface of the shaft end sealing element (4), and the diameter of the second root part (31) is smaller than the diameter of the first root part (21).

2. The screw connection structure according to claim 1, characterized in that: the first screw (2) and the second screw (3) are both flat socket inner hexagon socket head cap screws.

3. The screw connection structure according to claim 2, wherein: still be radial seal circle (5) that quantity is one at least, the middle section of first head (22) is encircleed circumference and is provided with seal groove (24), radial seal circle (5) have elasticity, the inner circle of radial seal circle (5) can be gone into in seal groove (24), the outer lane diameter of radial seal circle (5) is greater than the counter bore internal diameter of cylindricality countersunk head screw hole (11), the diapire of seal groove (24) can be hugged closely to the inner circle of radial seal circle (5) behind first root (21) screw in cylindricality countersunk head screw hole (11), the counter bore inner wall of cylindricality countersunk head screw hole (11) can be hugged closely to the outer lane of radial seal circle (5).

4. The screw connection structure according to claim 1, characterized in that: the vertical distance between the inner wall of the counter bore of the cylindrical countersunk head threaded hole (11) and the first head (22) of the first screw (2) is 0.1-0.15 mm.

5. The screw connection structure according to claim 1, characterized in that: the first screw (2) and the compressor volute (1) can be reinforced by welding after being matched by threads.