Mechanical sealing assembly with double-sealing-face structure

Abstract

The utility model provides a mechanical sealing assembly with a double-sealing-face structure, which comprises a fixed seat body, a movable sleeve, an outer sealing fixed ring, an outer sealing movable ring, an inner sealing fixed ring and an inner sealing movable ring, a hooping gap and a clamping hoop ring are arranged at the outer end of the movable sleeve of the mechanical sealing assembly, so that the movable sleeve can expand or contract in the radial direction; the inner positioning flange and the outer sealing fixed ring as well as the guide seat ring on the inner sealing fixed ring are matched with the limiting circular bead through the axial guide structure, so that the sealing assembly is suitable for transmission mandrels with different diameters, the universality and the adaptability of the assembly are improved, the service life of the sealing assembly is prolonged, and abrasion and leakage caused by size mismatching can be reduced; the inner positioning flange and the outer sealing fixed ring as well as the guide seat ring on the inner sealing fixed ring are matched with the limiting circular bead through the axial guide structure; accurate positioning and fixing between the sealing movable ring and the sealing fixed ring are ensured, the parallelism and contact pressure of the sealing face can be maintained, and the sealing effect is further improved.

Description

Technical Field

[0001] The utility model relates to a mechanical seal, in particular to a mechanical seal component with a double sealing surface structure. Background Art

[0002] Patent document CN211082829U discloses a mechanical seal assembly, including a sealing gasket and a static ring, a sealing cavity is provided at the right end of the sealing gasket, and a shaft sleeve is provided on the left side of the sealing cavity, and a dynamic ring is provided at the right end of the shaft sleeve, and the right end of the dynamic ring is connected to a dynamic sealing ring, the outer periphery of the right end of the shaft sleeve is wrapped with a retaining spring, and a limit clamp is provided on the outer side of the right end of the shaft sleeve, and the inner upper end of the limit clamp is connected to the shaft sleeve by a cylindrical head bolt, and the lower end of the cylindrical head bolt is connected to a set screw, the right end of the sealing gasket is fixed with a front end cover, the inner part of the shaft sleeve is fixed with a sealing ring, and the right end of the front end cover is connected to the dynamic ring seat by a fixed ring, the static ring is provided on the outer periphery of the shaft sleeve, and a reserved hole is opened inside the movable ring. The static ring and the dynamic ring are sealed by sliding fit to achieve bidirectional balance. However, this sealing assembly has poor assembly adaptability and has high requirements on the size of the transmission shaft. When the size is not suitable, it is easy to cause a decrease in assembly stability and form leakage. Utility Model Content

[0003] The purpose of the utility model is to provide a mechanical seal assembly with a double sealing surface structure to improve stability and sealing performance.

[0004] The technical solution adopted by the present invention to solve its technical problems is:

[0005] A mechanical seal assembly with a double sealing surface structure, comprising:

[0006] A fixed seat body, which is installed in the frame through a detachable connection structure and has an assembly opening therein;

[0007] A movable sleeve passes through the assembly opening of the fixed seat body and can rotate in the fixed seat body. An assembly shaft hole adapted to the transmission core shaft is opened inside the movable sleeve so that the transmission core shaft can rotate with the movable sleeve;

[0008] Also includes:

[0009] An outer sealing fixed ring is installed at the outer end of the fixed seat and wrapped around the outside of the movable sleeve;

[0010] The outer sealing dynamic ring is installed at the outer end of the movable sleeve and abuts against the end surface of the outer sealing top ring. It can rotate with the movable sleeve to form an outer sealing surface between the outer sealing fixed ring and the outer sealing dynamic ring;

[0011] An inner sealing fixed ring is installed at the inner end of the fixed seat and wrapped around the outside of the movable sleeve;

[0012] The inner sealing dynamic ring is installed on the inner end of the movable shaft sleeve and abuts against the end surface of the inner sealing top ring. It can rotate with the movable sleeve to form an inner sealing surface between the inner sealing fixed ring and the inner sealing dynamic ring.

[0013] An installation ridge is provided on the outer wall of the fixed seat body, which extends along the circumference of the fixed seat body and protrudes radially toward the outside of the fixed seat body. A connecting bolt hole extending axially is provided inside the mounting ridge, and the mounting ridge can be fixedly connected to the frame by a locking bolt adapted thereto.

[0014] A bearing sleeve is provided between the movable sleeve and the fixed seat body, and the movable sleeve body rotates in the fixed seat body through the bearing sleeve;

[0015] The outer end of the movable sleeve is provided with a fixing slot, and the fixing slots are provided in a group. The fixing slots are arranged in sequence along the circumference of the movable sleeve. The movable sleeve can be radially expanded or contracted through the fixing slots.

[0016] A clamping hoop is also provided at the outer end of the movable sleeve. A pair of clamping hoop is provided. Each clamping hoop is clamped on the outer wall of the movable sleeve and corresponds to the position of the fixed slit. The clamping hoop is engaged with each other by fixing bolts. The clamping hoop applies a radial clamping force to the outer end of the movable sleeve so that it is fixedly connected to the transmission core shaft after contraction, and an outer sealing dynamic ring installation space is enclosed between the clamping hoop and the movable sleeve, and the outer sealing dynamic ring is positioned by the clamping hoop.

[0017] The inner end of the movable sleeve has an inner positioning flange, which is integrally formed with the movable sleeve. It extends along the circumference of the movable sleeve and is rolled toward the outer end of the movable sleeve. An inner sealing dynamic ring installation space is formed between the inner positioning flange and the movable sleeve, and the inner sealing dynamic ring is positioned by the inner positioning flange.

[0018] A limiting shoulder is provided on the inner wall of the fixed seat body. The limiting shoulder extends along the circumference of the fixed seat body and protrudes radially toward the inside of the fixed seat body. The outer sealing ring and the inner sealing ring are respectively located on both sides of the limiting shoulder.

[0019] An outer guide seat ring is provided on the outer sealing fixed ring. The outer guide seat ring cooperates with the limit shoulder through an axial guide structure, and an external top pressure spring is provided between the outer guide seat ring and the limit shoulder. The external top pressure spring applies axial pressure to the outer guide seat ring and the outer sealing fixed ring, so that they are tightly fitted with the outer sealing dynamic ring.

[0020] An inner guide seat ring is provided on the inner sealing fixed ring. The inner guide seat ring cooperates with the limit shoulder through an axial guide structure, and an inner top pressure spring is provided between the inner guide seat ring and the limit shoulder. The inner top pressure spring applies axial pressure to the inner guide seat ring and the inner sealing fixed ring, so that they are tightly fitted with the inner sealing dynamic ring.

[0021] The advantages of the present invention are:

[0022] The outer end of the movable sleeve of the mechanical seal assembly is provided with a clamping slot and a clamping ring, so that it can expand or contract radially to adapt to drive core shafts of different diameters, thereby improving the versatility and adaptability of the assembly, and also helping to extend the service life of the sealing assembly and reduce wear and leakage caused by size mismatch. The inner positioning flange and the outer sealing fixed ring and the guide seat ring on the inner sealing fixed ring cooperate with the limit shoulder through the axial guide structure to ensure the precise positioning and fixation between the sealing dynamic ring and the fixed ring, which helps to maintain the parallelism and contact pressure of the sealing surface and further improve the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a mechanical seal assembly with a double sealing surface structure proposed by the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] like Figure 1As shown, the mechanical seal assembly with a double sealing surface structure proposed by the present invention includes a fixed seat body 100, a movable sleeve 200, an outer sealing fixed ring 300, an outer sealing dynamic ring 400, an inner sealing fixed ring 500 and an inner sealing dynamic ring 600. The fixed seat body is installed in the frame through a detachable connection structure, and an assembly through-hole is opened inside the fixed seat body. The movable sleeve passes through the assembly through-hole of the fixed seat body and can rotate in the fixed seat body. An assembly shaft hole adapted to the transmission core shaft is opened inside the fixed seat body so that the transmission core shaft can rotate together with the movable sleeve. The outer sealing fixed ring is installed at the outer end of the fixed seat body and wrapped around the outside of the movable sleeve. The outer sealing dynamic ring is installed at the outer end of the movable sleeve and abuts against the end face of the outer sealing top ring. It can rotate with the movable sleeve to form an outer sealing surface between the outer sealing fixed ring and the outer sealing dynamic ring. The inner sealing fixed ring is installed at the inner end of the fixed seat body and wrapped around the outside of the movable sleeve. The inner sealing dynamic ring is installed at the inner end of the movable shaft sleeve and abuts against the end face of the inner sealing top ring. It can rotate with the movable sleeve to form an inner sealing surface between the inner sealing fixed ring and the inner sealing dynamic ring.

[0026] A mounting ridge 110 is provided on the outer wall of the fixed seat body. The mounting ridge extends along the circumference of the fixed seat body and protrudes radially toward the outside of the fixed seat body. A connecting bolt hole extending axially is provided inside the mounting ridge, and the mounting ridge can be fixedly connected to the frame by a locking bolt adapted thereto.

[0027] A bearing sleeve is provided between the movable sleeve and the fixed seat body, and the movable sleeve body rotates in the fixed seat body through the bearing sleeve;

[0028] The outer end of the movable sleeve is provided with a fixing slot 210, which is provided in a group and arranged in sequence along the circumference of the movable sleeve. The movable sleeve can be radially expanded or contracted through the fixing slot.

[0029] A clamping hoop 220 is also provided at the outer end of the movable sleeve. A pair of clamping hoop rings are provided. Each clamping hoop ring is clamped on the outer wall of the movable sleeve and corresponds to the position of the fixed slit. The clamping hoop rings are engaged with each other by fixing bolts. The clamping hoop ring applies a radial clamping force to the outer end of the movable sleeve so that it is fixedly connected to the transmission core shaft after contraction, and an outer sealing dynamic ring installation space is enclosed between the clamping hoop ring and the movable sleeve, and the outer sealing dynamic ring is positioned by the clamping hoop ring.

[0030] The inner end of the movable sleeve has an inner positioning flange 230, which is integrally formed with the movable sleeve. It extends along the circumference of the movable sleeve and is rolled toward the outer end of the movable sleeve. An inner sealing dynamic ring installation space is formed between the inner positioning flange and the movable sleeve, and the inner sealing dynamic ring is positioned by the inner positioning flange.

[0031] A limiting shoulder 240 is provided on the inner wall of the fixed seat body. The limiting shoulder extends along the circumference of the fixed seat body and protrudes radially toward the inner side of the fixed seat body. The outer sealing ring and the inner sealing ring are respectively located on both sides of the limiting shoulder.

[0032] An outer guide seat ring 310 is provided on the outer sealing fixed ring. The outer guide seat ring cooperates with the limit shoulder through an axial guide structure, and an external top pressure spring is provided between the outer guide seat ring and the limit shoulder. The external top pressure spring applies axial pressure to the outer guide seat ring and the outer sealing fixed ring, so that they are tightly fitted with the outer sealing dynamic ring.

[0033] An inner guide seat ring 510 is provided on the inner sealing fixed ring. The inner guide seat ring cooperates with the limit shoulder through an axial guide structure, and an inner top pressure spring is provided between the inner guide seat ring and the limit shoulder. The inner top pressure spring applies axial pressure to the inner guide seat ring and the inner sealing fixed ring, so that they are tightly fitted with the inner sealing dynamic ring.

[0034] In the description of the present utility model, it should be noted that when terms such as "upper", "lower", "inner", "outer", "left", and "right" indicate an orientation or positional relationship, they should be understood as being based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present utility model. In addition, when terms such as "first" and "second" appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and limited, terms such as "installation", "setting", and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two elements. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

Claims

1. A mechanical seal assembly with a double sealing surface structure, comprising: A fixed seat body, which is installed in the frame through a detachable connection structure and has an assembly opening therein; A movable sleeve passes through the assembly opening of the fixed seat body and can rotate in the fixed seat body. An assembly shaft hole adapted to the transmission core shaft is opened inside the movable sleeve so that the transmission core shaft can rotate with the movable sleeve; It is characterized by further comprising: An outer sealing fixed ring is installed at the outer end of the fixed seat and wrapped around the outside of the movable sleeve; The outer sealing dynamic ring is installed at the outer end of the movable sleeve and abuts against the end surface of the outer sealing top ring. It can rotate with the movable sleeve to form an outer sealing surface between the outer sealing fixed ring and the outer sealing dynamic ring; An inner sealing fixed ring is installed at the inner end of the fixed seat and wrapped around the outside of the movable sleeve; The inner sealing dynamic ring is installed on the inner end of the movable shaft sleeve and abuts against the end surface of the inner sealing top ring. It can rotate with the movable sleeve to form an inner sealing surface between the inner sealing fixed ring and the inner sealing dynamic ring.

2. The mechanical seal assembly with a double sealing surface structure according to claim 1, characterized in that: An installation ridge is provided on the outer wall of the fixed seat body, which extends along the circumference of the fixed seat body and protrudes radially toward the outside of the fixed seat body. A connecting bolt hole extending axially is provided inside the mounting ridge, and the mounting ridge can be fixedly connected to the frame by a locking bolt adapted thereto.

3. The mechanical seal assembly with a double sealing surface structure according to claim 1, characterized in that: A rotation bearing sleeve is provided between the movable sleeve and the fixed seat body, and the movable sleeve body rotates in the fixed seat body through the rotation bearing sleeve.

4. The mechanical seal assembly with a double sealing surface structure according to claim 1, characterized in that: The outer end of the movable sleeve is provided with a hoop fixing slot, and the hoop fixing slot is provided in a group, and the hoop fixing slots are arranged in sequence along the circumference of the movable sleeve; A clamping hoop is also provided at the outer end of the movable sleeve. A pair of clamping hoop is provided. Each clamping hoop is clamped on the outer wall of the movable sleeve and corresponds to the position of the fixed slit. The clamping hoop is engaged with each other by fixing bolts. The clamping hoop applies a radial clamping force to the outer end of the movable sleeve, so that it is fixedly connected to the transmission core shaft after contraction, and an outer sealing dynamic ring installation space is enclosed between the clamping hoop and the movable sleeve.

5. The mechanical seal assembly with a double sealing surface structure according to claim 1, characterized in that: The inner end of the movable sleeve has an inner positioning flange, which is integrally formed with the movable sleeve. It extends along the circumference of the movable sleeve and is rolled toward the outer end of the movable sleeve to form an inner sealing dynamic ring installation space between the inner positioning flange and the movable sleeve.

6. The mechanical seal assembly with a double sealing surface structure according to claim 1, characterized in that: A limiting shoulder is provided on the inner wall of the fixed seat body. The limiting shoulder extends along the circumference of the fixed seat body and protrudes radially toward the inside of the fixed seat body. The outer sealing ring and the inner sealing ring are respectively located on both sides of the limiting shoulder.

7. The mechanical seal assembly with a double sealing surface structure according to claim 6, characterized in that: An outer guide seat ring is provided on the outer sealing fixed ring. The outer guide seat ring cooperates with the limit shoulder through an axial guide structure, and an outer pressure spring is provided between the outer guide seat ring and the limit shoulder.

8. The mechanical seal assembly with a double sealing surface structure according to claim 6, characterized in that: An inner guide seat ring is provided on the inner sealing fixed ring. The inner guide seat ring cooperates with the limit shoulder through an axial guide structure, and an inner pressure spring is provided between the inner guide seat ring and the limit shoulder.

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