Valve rod sealing structure and valve

Abstract

The utility model discloses a valve rod sealing structure which comprises a valve body, a stuffing box and a valve rod, the stuffing box is arranged on the valve body, the valve rod and the stuffing box are matched together in a rotating mode, the valve rod sealing structure further comprises a gland, a pressing sleeve, graphite packing and a PTFE packing set, the graphite packing is annular graphite packing, the PTFE packing set is annular PTFE packing set, and the gland is arranged on the valve body. The inner diameter of the graphite packing is equal to that of the PTFE packing set, the outer diameter of the graphite packing is larger than that of the PTFE packing set, the graphite packing and the PTFE packing set are both arranged in a stepped hole of the packing box, the gland is arranged on the valve body, the pressing sleeve is located between the graphite packing and the gland, the graphite packing is located between the PTFE packing set and the pressing sleeve, and the PTFE packing set is located between the PTFE packing set and the pressing sleeve. The graphite packing and the PTFE packing set are matched with the valve rod in a rotating mode. The utility model further discloses the valve comprising the valve rod sealing structure.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to a valve stem sealing structure and a valve. Background Art

[0002] Valve is an important component commonly used in industry. Since the valve can be opened and closed only by twisting the valve stem, the seal between the valve stem and the valve body is actually a leak point, and its sealing safety is very important. The sealing structure between the valve stem and the valve body of the current valve is shown in the patent announcement document CN213393823U. This sealing structure relies on a compression sleeve (numbered 3 in the document) pressing a drum-shaped sealing ring (numbered 5 in the document) to seal. This sealing structure has poor sealing effect and is not fireproof. Utility Model Content

[0003] In view of the above problems, the utility model proposes a valve stem sealing structure.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A valve stem sealing structure comprises a valve body, a stuffing box and a valve stem, wherein the stuffing box is arranged on the valve body, and the valve stem and the stuffing box are rotatably matched together. The structure also comprises a gland, a compression sleeve, a graphite packing and a PTFE packing group, wherein the graphite packing is an annular graphite packing, and the PTFE packing group is an annular PTFE packing group. The inner diameters of the graphite packing and the PTFE packing group are equal, and the outer diameter of the graphite packing is larger than the outer diameter of the PTFE packing group. The graphite packing and the PTFE packing group are both arranged in a step hole of the stuffing box, the gland is arranged on the valve body, the compression sleeve is located between the graphite packing and the gland, the graphite packing is located between the PTFE packing group and the compression sleeve, and the graphite packing and the PTFE packing group are rotatably matched together with the valve stem.

[0006] In this valve stem sealing structure, a double seal of PTFE packing group and graphite packing is adopted. Since the PTFE packing group is located on the inside and the graphite packing is located on the outside, the PTFE combination packing on the inside can prevent the graphite packing from powdering and entering the pipeline during the rotation of the valve stem, which can meet the occasions with high cleanliness. In flammable and explosive occasions, if a fire occurs, the graphite packing on the outside has good high temperature resistance and fireproof performance, which can ensure that the seal will not fail in the event of a fire, ensuring the safety of the entire valve.

[0007] In summary, the valve of this structure realizes double sealing by combining the graphite packing and the PTFE packing group, which has a better sealing effect and the sealing will not fail in the event of a fire.

[0008] Optionally, a packing pad is further included, and the packing pad is arranged between the graphite packing and the PTFE packing group.

[0009] The function of the packing pad is to separate the PTFE packing group and the graphite packing, and to make the PTFE packing group and the graphite packing in a compressed state.

[0010] Optionally, the packing pad is an annular packing pad.

[0011] The specific packing pad is a packing pad made of annular metal material.

[0012] Optionally, the gland is fixed to the valve body by bolts, one end of the gland is against the gland, and the other end of the gland is against the graphite packing.

[0013] Optionally, the stuffing box is fitted with the valve body via screws.

[0014] Optionally, one end of the pressing sleeve is located inside the stuffing box, and the other end of the pressing sleeve is located outside the stuffing box.

[0015] Optionally, the valve stem is perpendicular to the gland.

[0016] A valve comprises the valve stem sealing structure as described above.

[0017] The beneficial effects of the utility model are as follows: by using the graphite filler and the PTFE filler group in combination, double sealing is achieved, the sealing effect is better, and the sealing will not fail in the event of a fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram showing the use status of the valve stem seal structure;

[0019] Figure 2 It is a schematic diagram of the matching relationship between the stuffing box and the valve stem;

[0020] Figure 3 It is a schematic diagram of the structure of graphite packing;

[0021] Figure 4 It is a schematic diagram of the structure of the PTFE packing group.

[0022] The reference numerals in the figure are: 1, stuffing box; 2A, graphite packing; 2B, PTEF packing group; 3, stuffing pad; 4, gland; 5, bolt; 6, valve stem; 7, gland; 8, screw; 9, valve body. DETAILED DESCRIPTION

[0023] The utility model is described in detail below in conjunction with the accompanying drawings.

[0024] Example 1

[0025] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, a valve stem 6 sealing structure includes a valve body 9, a stuffing box 1 and a valve stem 6, wherein the stuffing box 1 is arranged on the valve body 9, and the valve stem 6 is rotatably matched with the stuffing box 1. It also includes a gland 4, a pressing sleeve 7, a graphite packing 2A and a PTFE packing group. The graphite packing 2A is an annular graphite packing 2A, and the PTFE packing group is an annular PTFE packing group. The inner diameters of the graphite packing 2A and the PTFE packing group are equal, and the outer diameter of the graphite packing 2A is larger than the outer diameter of the PTFE packing group. The graphite packing 2A and the PTFE packing group are both arranged in the step hole of the stuffing box 1, the gland 4 is arranged on the valve body 9, the pressing sleeve 7 is located between the graphite packing 2A and the gland 4, and the graphite packing 2A is located between the PTFE packing group and the pressing sleeve 7. The graphite packing 2A and the PTFE packing group are rotatably matched with the valve stem 6.

[0026] In this valve stem 6 sealing structure, a double seal of PTFE packing group and graphite packing 2A is adopted. Since the PTFE packing group is located on the inside and the graphite packing 2A is located on the outside, the PTFE combination packing on the inside can prevent the graphite packing 2A from powdering and entering the pipeline during the rotation of the valve stem 6, which can meet the occasions with high cleanliness. In flammable and explosive occasions, if a fire occurs, the graphite packing 2A located on the outside has good high temperature resistance and fireproof performance, which can ensure that the seal will not fail in the event of a fire, ensuring the safety of the entire valve.

[0027] In summary, in the valve of this structure, double sealing is achieved by combining the graphite packing 2A and the PTFE packing group, which has a better sealing effect and the sealing will not fail in the event of a fire.

[0028] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, it also includes a packing pad 3, which is arranged between the graphite packing 2A and the PTFE packing group.

[0029] The packing pad 3 has the following functions: first, to separate the PTFE packing group and the graphite packing 2A; second, to make the PTFE packing group and the graphite packing 2A in a compressed state.

[0030] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, the packing pad 3 is an annular packing pad 3 .

[0031] Specifically, the packing pad 3 is a packing pad 3 made of an annular metal material.

[0032] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, the gland 4 is fixed to the valve body 9 by bolts 5, one end of the gland 7 abuts against the gland 4, and the other end of the gland 7 abuts against the graphite packing 2A.

[0033] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, the stuffing box 1 is matched with the valve body 9 through screws 8.

[0034] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, one end of the pressing sleeve 7 is located inside the stuffing box 1 , and the other end of the pressing sleeve 7 is located outside the stuffing box 1 .

[0035] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, the valve stem 6 is perpendicular to the gland 4.

[0036] Example 2

[0037] A valve includes the valve stem sealing structure as shown in Example 1. The valve may be a ball valve or a valve of other forms.

[0038] The above description is only a preferred embodiment of the present invention, and does not limit the patent protection scope of the present invention. Any equivalent transformations made using the contents of the present invention specification, directly or indirectly used in other related technical fields, are also included in the protection scope of the present invention.

Claims

1. A valve stem sealing structure, comprising a valve body, a stuffing box and a valve stem, wherein the stuffing box is arranged on the valve body, and the valve stem and the stuffing box are rotatably matched together, characterized in that: It also includes a gland, a compression sleeve, a graphite packing and a PTFE packing group, the graphite packing is an annular graphite packing, the PTFE packing group is an annular PTFE packing group, the inner diameters of the graphite packing and the PTFE packing group are equal, the outer diameter of the graphite packing is larger than the outer diameter of the PTFE packing group, the graphite packing and the PTFE packing group are both arranged in the step hole of the stuffing box, the gland is arranged on the valve body, the compression sleeve is located between the graphite packing and the gland, the graphite packing is located between the PTFE packing group and the compression sleeve, and the graphite packing and the PTFE packing group are rotatably matched with the valve stem.

2. The valve stem sealing structure according to claim 1, characterized in that: It also includes a packing pad, which is arranged between the graphite packing and the PTFE packing group.

3. The valve stem sealing structure according to claim 2, characterized in that: The packing pad is an annular packing pad.

4. The valve stem sealing structure according to claim 1, characterized in that: The gland is fixed to the valve body by bolts, one end of the gland abuts against the gland, and the other end of the gland abuts against the graphite filler.

5. The valve stem sealing structure according to claim 1, characterized in that: The stuffing box is matched with the valve body through screws.

6. The valve stem sealing structure according to claim 1, characterized in that: One end of the compression sleeve is located in the stuffing box, and the other end of the compression sleeve is located outside the stuffing box.

7. The valve stem sealing structure according to claim 1, characterized in that: The valve stem is perpendicular to the gland.

8. A valve, characterized in that: It comprises the valve stem sealing structure as claimed in any one of claims 1 to 7.

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