Sealing box type shaft sleeve adjusting valve rod structure for valve

Abstract

A sealing box type adjusting valve rod structure for a valve comprises a valve rod (4) installed on a valve body (2) and a valve clack (1) installed on the valve rod (4), and is technically characterized in that the valve rod (4) and the valve body (2) are rotatably sealed through a sealing box assembly (3), and a connecting flange (5) is arranged on the outer side of the sealing box assembly (3); the sealing box assembly (3) comprises a shaft seal shell (35) limited between the valve body (2) and the valve rod (4), the outer side of the shaft seal shell (35) is sealed by an outer sealing ring (36), and the inner side of the shaft seal shell (35) is sealed by an oil seal (31), an inner sealing ring (32), a sliding bearing (33) and an upper sealing ring (34). The device has the advantages of simple structure, reasonable manufacturability, low manufacturing cost and the like.

Description

Technical Field

[0001] The utility model belongs to the field of solid-liquid medium fluid transportation, and in particular relates to a valve stem structure for a pipeline for slurry transportation. Background Art

[0002] At present, in the field of long-distance solid-liquid medium fluid transportation, due to the presence of solid particles, the inner cavity and the flow channel are directly connected during the opening and closing process of the valve. A large amount of solid particle slurry will enter the inner cavity and enter the valve stem gap to precipitate, which may cause the valve sleeve to fail and lose the ability to operate. With the improvement of process level and the non-interval long-cycle working system of fluid transportation equipment, slurry valves are key supporting equipment in the output pipeline. The requirements for its long life and stability are getting higher and higher. Therefore, a valve stem structure that can be used in solid-liquid particle slurry conditions, easy to maintain, good sealing performance, and stable performance is very urgent. Utility Model Content

[0003] The utility model aims at solving the above problems and provides a valve stem structure with simple structure, reasonable processability, low manufacturing cost and stable mechanical performance.

[0004] To achieve the above purpose, the utility model provides the following technical solution: the valve uses a sealing box-type sleeve to adjust the valve stem structure, including a valve stem installed on the valve body and a valve disc installed on the valve stem. The technical points are:

[0005] The valve stem and the valve body are rotatably sealed by a sealing box assembly, and a connecting flange is provided on the outer side of the sealing box assembly;

[0006] The sealing box assembly comprises a shaft sealing housing limited between the valve body and the valve stem, the outer side of the shaft sealing housing is sealed by an outer sealing ring, and the inner side of the shaft sealing housing is sealed by an oil seal, an inner sealing ring, a sliding bearing and an upper sealing ring.

[0007] Furthermore, the valve stem is stepped.

[0008] Furthermore, an adjustment gasket is provided between the shaft seal housing and the valve disc or / and between the shaft seal housing and the valve stem.

[0009] Further, the sliding bearing includes a bearing backing and a bearing inner layer.

[0010] Furthermore, the valve disc and the valve stem are matched with each other through a key or a rectangular pin.

[0011] Furthermore, the connecting flange passes through the shaft seal housing through a connecting piece and is fixed on the valve body.

[0012] Beneficial effects of the utility model: In terms of the overall technical solution, the utility model realizes shaft sealing by arranging a sealing box assembly between the valve body and the valve stem, and securely fixes the sealing box assembly on the valve body through a connecting flange that penetrates the sealing box assembly.

[0013] In terms of specific structure, the valve stem adopts a stepped structure and the sealing box adopts a multiple sealing structure, thus ensuring multiple sealing performance.

[0014] Depending on the different working conditions, the valve stem and valve disc are connected by key connection or rectangular pin to ensure the valve stem torque requirement under large diameter and high pressure.

[0015] The sliding bearing structure adopted can withstand a large increase in torque. The sliding bearing adopts a steel back bushing, a maintenance-free metal polymer bushing inside, and a running-in layer made of a plastic composite material with a low friction coefficient. The sliding bearing structure is lifted and not placed in the slurry. The sealing rings on both sides ensure that the environment of the sliding bearing is clean, the mechanical performance is stable, and it takes up little space in the equipment.

[0016] The design of the valve stem, sealing box and gasket has the function of preventing the valve stem from blowing out. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 2 It is a schematic diagram of two connection modes of the valve stem and the valve disc of the utility model.

[0019] Figure 3 It is a structural schematic diagram of the sliding bearing of the utility model. DETAILED DESCRIPTION

[0020] The following combination Figures 1 to 3 , the specific structure of the utility model is described in detail through specific embodiments. Example 1

[0021] The valve uses a sealing box type shaft sleeve to adjust the valve stem structure, including a stepped valve stem 4 installed on the valve body 2, and a valve disc 1 installed on the valve stem 4. The valve stem 4 and the valve body 2 are rotatably sealed by a sealing box assembly 3, and a connecting flange 5 is provided on the outer side of the sealing box assembly 3. The connecting flange 5 is fixed to the valve body 2 after passing through the shaft seal housing 35 through bolts 51.

[0022] The sealing box assembly 3 includes a shaft seal housing 35 limited between the valve body 2 and the valve stem 4. The outer side of the shaft seal housing 35 is sealed by an outer sealing ring 36, and the inner side of the shaft seal housing 35 is sealed by an oil seal 31, an inner sealing ring 32, a sliding bearing 33 and an upper sealing ring 34. The sliding bearing 33 includes a bearing backing 331 and a bearing inner layer 332.

[0023] An adjustment pad 21 is provided between the shaft seal housing 35 and the valve disc 1 or / and between the shaft seal housing 35 and the valve stem 4. The valve disc 1 and the valve stem 4 can be connected by a key 41 or the end face of the valve stem 4 is set to a rectangle and connected in a manner of a rectangular pin 42 and a rectangular groove. By designing the stepped shaft of the valve stem 4, the valve stem 4 is placed in the sealing box 3, and an adjustment pad 21 is provided between the stepped platform and the sealing box 3, which ensures the position of the valve stem and plays a role in preventing the valve stem from blowing out.

[0024] Description of reference numerals: 1 valve disc;

[0025] 2 valve body, 21 adjusting pad;

[0026] 3 seal box assembly, 31 oil seal, 32 inner seal ring, 33 sliding bearing, 331 bearing backing, 332 bearing inner layer, 34 upper seal ring, 35 shaft seal housing, 36 outer seal ring;

[0027] 4 valve stem, 41 key, 42 rectangular pin;

[0028] 5 connecting flange, 51 bolts.

Claims

1. A valve stem structure with a sealing box-type sleeve for adjusting a valve stem, comprising a valve stem (4) mounted on a valve body (2) and a valve flap (1) mounted on the valve stem (4), characterized in that: The valve stem (4) and the valve body (2) are rotatably sealed via a sealing box assembly (3), and a connecting flange (5) is provided on the outer side of the sealing box assembly (3); The sealing box assembly (3) comprises a shaft sealing housing (35) limited between the valve body (2) and the valve stem (4); the outer side of the shaft sealing housing (35) is sealed by an outer sealing ring (36); and the inner side of the shaft sealing housing (35) is sealed by an oil seal (31), an inner sealing ring (32), a sliding bearing (33) and an upper sealing ring (34).

2. The sealing box type sleeve adjusting valve stem structure for a valve according to claim 1, characterized in that: The valve stem (4) is of stepped type.

3. The sealing box type sleeve adjusting valve stem structure for a valve according to claim 1, characterized in that: An adjustment gasket (21) is provided between the shaft seal housing (35) and the valve disc (1) or / and between the shaft seal housing (35) and the valve stem (4).

4. The sealing box type sleeve adjusting valve stem structure for a valve according to claim 1, characterized in that: The sliding bearing (33) comprises a bearing backing (331) and a bearing inner layer (332).

5. The sealing box type sleeve adjusting valve stem structure for a valve according to claim 1 or 2, characterized in that: The valve flap (1) and the valve stem (4) are matched with each other via a key (41) or a rectangular pin (42).

6. The sealing box type sleeve adjusting valve stem structure for a valve according to claim 1 or 2, characterized in that: The connecting flange (5) is fixed on the valve body (2) after passing through the shaft seal housing (35) via bolts (51).

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