Anti-crystallization butterfly valve

Abstract

An anti-crystallization butterfly valve comprises a valve body, a valve rod is arranged in the valve body, a butterfly plate is connected to the valve rod, and the anti-crystallization butterfly valve is characterized in that an upper shaft sleeve and a lower shaft sleeve are arranged on the valve rod respectively and located between the valve rod and the valve body on the upper portion of the butterfly plate and between the valve rod and the valve body on the lower portion of the butterfly plate respectively. A plurality of first O-shaped rings are respectively arranged between the upper shaft sleeve and the valve rod and between the lower shaft sleeve and the valve rod, a plurality of second O-shaped rings are respectively arranged between the upper shaft sleeve and the valve body and between the lower shaft sleeve and the valve rod, and radial bearings are further arranged between the upper shaft sleeve and the valve rod and between the lower shaft sleeve and the valve rod. Salt-containing fluid entering a gap between the upper shaft sleeve and the lower shaft sleeve of the valve body is reduced to the maximum extent, meanwhile, direct contact between a medium and filler is avoided, and the influence of crystal substances generated when the fluid is crystallized due to temperature change on the valve is reduced to the minimum.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely relates to a kind of anti-crystallization butterfly valves. BACKGROUND

[0002] In brine medium, in the case where temperature is higher, the solubility of salt in liquid medium is higher, salt is fully dissolved in liquid, when the temperature of pipeline medium reduces, the solubility of salt in saturated solution reduces, the salt in the middle of these gaps and the part of medium permeating into the middle of packing will be converted into solid crystal, so that packing hardens, the shaft sleeve is blocked, so that the valve opening and closing are blocked or even difficult to normally open and close, affect the operation of actuator, the existence of solid salt intensifies the wear of valve rod surface, and the sealing life of valve rod and packing is shortened, thereby affecting the service life of valve. SUMMARY

[0003] In order to solve the technical defects existing in the prior art, the utility model provides an anti-crystallization butterfly valve.

[0004] The technical solution adopted by the utility model is: an anti-crystallization butterfly valve, comprising a valve body, a valve rod is arranged in the valve body, a butterfly plate is connected to the valve rod, an upper shaft sleeve and a lower shaft sleeve are arranged on the valve rod, the upper shaft sleeve and the lower shaft sleeve are respectively arranged between the valve rod and the valve body at the upper part and the lower part of the butterfly plate, a plurality of first O-rings are arranged between the upper shaft sleeve, the lower shaft sleeve and the valve rod, a plurality of second O-rings are arranged between the upper shaft sleeve, the lower shaft sleeve and the valve body, and a radial bearing is further arranged between the upper shaft sleeve, the lower shaft sleeve and the valve rod.

[0005] The upper shaft sleeve and the lower shaft sleeve extend in the direction of the valve rod to form first mounting portions, the upper shaft sleeve and the lower shaft sleeve extend in the direction of the valve body to form second mounting portions, mounting grooves are arranged in the first mounting portions and the second mounting portions, and the first O-rings and the second O-rings are arranged in the mounting grooves.

[0006] A step is further arranged on the end face of the second mounting portion of the upper shaft sleeve and the lower shaft sleeve, a boss is arranged on the valve body, and the step is limited and matched with the boss.

[0007] Limiting rings are arranged on the lower shaft sleeve, the limiting rings are arranged on the outer side of the valve rod and between the butterfly plate and the lower shaft sleeve.

[0008] An adjusting pad is further arranged at the bottom of the lower shaft sleeve.

[0009] A third O-ring is further arranged between the limiting ring and the lower shaft sleeve.

[0010] The first O-shaped ring and the second O-shaped ring are both two in number, and the two first O-shaped rings and the two second O-shaped rings are respectively arranged in the mounting grooves of the first mounting part and the second mounting part.

[0011] The utility model discloses a beneficial effect is: the utility model provides a kind of anti-crystallization butterfly valve, including valve body, the valve body is equipped with valve stem, the valve stem is connected with butterfly plate, it is characterized in that, the valve stem is equipped with upper shaft sleeve and lower shaft sleeve respectively, the upper shaft sleeve and lower shaft sleeve are respectively located between the valve stem and valve body in butterfly plate upper portion and butterfly plate lower portion, the upper shaft sleeve and lower shaft sleeve are respectively equipped with a plurality of first O-shaped rings between valve stem, the upper shaft sleeve and lower shaft sleeve are respectively equipped with a plurality of second O-shaped rings between valve body, the upper shaft sleeve and lower shaft sleeve are still equipped with radial bearing between valve stem, respectively add two O-shaped ring seals on the original valve stem upper and lower shaft sleeve, maximum limit reduce the gap of the fluid containing salt into the upper and lower shaft sleeve parts of valve body, while avoiding the direct contact of medium and filler, so that the influence of crystallization produced when fluid exists temperature change and crystallization to valve is reduced to minimum. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is schematic diagram of conventional butterfly valve stem sealing structure.

[0013] Figure 2 It is schematic diagram of the utility model valve stem anti-crystallization sealing structure.

[0014] Figure 3 It is schematic diagram of the utility model valve stem upper shaft sleeve sealing structure.

[0015] Figure 4 It is schematic diagram of the utility model valve stem lower shaft sleeve sealing structure.

[0016] Wherein 1-valve body, 2-valve stem, 3-butterfly plate, 4-upper shaft sleeve, 5-lower shaft sleeve, 6-first O-shaped ring, 7-second O-shaped ring, 8-radial bearing, 9-limit ring, 41-first mounting part, 42-second mounting part, 51-adjusting pad, 91-third O-shaped ring. DETAILED DESCRIPTION

[0017] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0018] The crystallization-preventing butterfly valve comprises a valve body 1, a valve rod 2 arranged in the valve body 1, a butterfly plate 3 connected to the valve rod 2, an upper shaft sleeve 4 and a lower shaft sleeve 5 arranged on the valve rod 2 respectively, a plurality of first O-rings 6 arranged between the upper shaft sleeve 4 and the lower shaft sleeve 5 and the valve rod 2 respectively, a plurality of second O-rings 7 arranged between the upper shaft sleeve 4 and the lower shaft sleeve 5 and the valve body 1 respectively, and a radial bearing 8 arranged between the upper shaft sleeve 4 and the lower shaft sleeve 5 and the valve rod 2. The upper shaft sleeve 4 and the lower shaft sleeve 5 extend towards the valve rod 2 to form first mounting portions 41, and extend towards the valve body 1 to form second mounting portions 42. The first mounting portions 41 and the second mounting portions 42 are each provided with a mounting groove, and the first O-rings 6 and the second O-rings 7 are arranged in the mounting grooves. The second mounting portions 42 of the upper shaft sleeve 4 and the lower shaft sleeve 5 are further provided with steps, the valve body 1 is provided with a boss, and the steps are limitedly matched with the boss. The lower shaft sleeve 5 is provided with a limiting ring 9, and the limiting ring 9 is arranged outside the valve rod 2 and between the butterfly plate 3 and the lower shaft sleeve 5. The number of the first O-rings 6 and the second O-rings 7 is two, and the two first O-rings 6 and the two second O-rings 7 are arranged in the first mounting portions 41 and the second mounting portions 42 respectively. The crystallization-preventing butterfly valve increases two O-rings on the upper shaft sleeve and the lower shaft sleeve of the valve rod respectively, so that the gap of the upper shaft sleeve and the lower shaft sleeve of the valve body is reduced to the minimum, the direct contact between the medium and the packing is avoided, and the influence of the crystallization produced by the fluid under temperature change on the valve is reduced to the minimum.

[0019] The bottom of the lower shaft sleeve 5 is further provided with an adjusting pad 51.

[0020] The third O-ring 91 is further arranged between the limiting ring 9 and the lower shaft sleeve 5.

[0021] It should be noted that, although the utility model has been described according to the above specific embodiments, the utility model idea of the utility model is not limited to the utility model, and any modification using the utility model idea will be included in the patent protection range of the utility model.

[0022] The above is only the preferred embodiment of the utility model, and the protection range of the utility model is not limited to the above embodiment. Any improvement and decoration without departing from the principle of the utility model should be considered as the protection range of the utility model.

Claims

1. A crystallization-preventing butterfly valve, comprising a valve body (1), a valve stem (2) arranged in the valve body (1), and a butterfly plate (3) connected to the valve stem (2), characterized in that, The valve stem (2) is respectively provided with an upper shaft sleeve (4) and a lower shaft sleeve (5), the upper shaft sleeve (4) and the lower shaft sleeve (5) are respectively located between the valve stem (2) and the valve body (1) at the upper part of the butterfly plate (3) and the lower part of the butterfly plate (3), a plurality of first O-rings (6) are respectively arranged between the upper shaft sleeve (4) and the lower shaft sleeve (5) and the valve stem (2), a plurality of second O-rings (7) are respectively arranged between the upper shaft sleeve (4) and the lower shaft sleeve (5) and the valve body (1), and a radial bearing (8) is further arranged between the upper shaft sleeve (4) and the lower shaft sleeve (5) and the valve stem (2).

2. The anti-crystallization butterfly valve according to claim 1, characterized in that, The upper shaft sleeve (4) and the lower shaft sleeve (5) extend towards the valve stem (2) to form a first mounting portion (41), the upper shaft sleeve (4) and the lower shaft sleeve (5) extend towards the valve body (1) to form a second mounting portion (42), mounting grooves are arranged in the first mounting portion (41) and the second mounting portion (42), and the first O-rings (6) and the second O-rings (7) are arranged in the mounting grooves.

3. The anti-crystallization butterfly valve of claim 2, wherein, A step is further arranged on the end face of the second mounting portion (42) of the upper shaft sleeve (4) and the lower shaft sleeve (5), a boss is arranged on the valve body (1), and the step is limited and matched with the boss.

4. The anti-crystallization butterfly valve of claim 1, wherein, Limiting rings (9) are arranged on the lower shaft sleeve (5), the limiting rings (9) are arranged outside the valve stem (2) and between the butterfly plate (3) and the lower shaft sleeve (5).

5. The anti-crystallization butterfly valve of claim 1, wherein, An adjusting pad (51) is further arranged at the bottom of the lower shaft sleeve (5).

6. The anti-crystallization butterfly valve of claim 4, wherein, A third O-ring (91) is further arranged between the limiting ring (9) and the lower shaft sleeve (5).

7. The anti-crystallization butterfly valve of claim 2, wherein, The number of the first O-rings (6) and the second O-rings (7) is two, and the two first O-rings (6) and the two second O-rings (7) are respectively arranged in the mounting grooves of the first mounting portion (41) and the second mounting portion (42).

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