Liquid chlorine conveying corrugated pipe stop valve and sealing method

Abstract

The invention discloses a liquid chlorine conveying corrugated pipe stop valve and a sealing method, the liquid chlorine conveying corrugated pipe stop valve comprises a valve body, a valve cover and a valve rod component, and further comprises a fixing piece, a first sealing component and a second sealing component, the fixing piece is located in the valve body and divides a valve cavity into an upper cavity and a lower cavity; the first sealing component is located in the lower cavity and provided with a first corrugated pipe. The first corrugated pipe is sleeved on the outer side of the valve rod component and is welded and connected between the fixing piece and the valve clack in a sealing manner; the valve rod part penetrates through the fixing piece; and the second sealing part is positioned in the upper cavity and is used for sealing the peripheral side of the valve rod part. According to the liquid chlorine conveying corrugated pipe stop valve and the sealing method, the structure is simple and compact, the overall sealing performance is improved through three-layer sealing of the valve cavity in the stop valve, and the situation that sealing fails due to long-time use of a single corrugated pipe is avoided; and the elastic sealing contact can compensate the abrasion and deformation of the valve clack and the valve seat after long-time use, so that the reduction of the sealing performance is avoided.

Description

Technical Field

[0001] The invention relates to sealing technology, belongs to the field of valves, and specifically relates to a liquid chlorine delivery bellows stop valve and a sealing method. Background Art

[0002] The stop valve is a common valve used in the chemical industry to control and regulate highly corrosive flowing media such as liquid chlorine. Since the conveying media are often highly corrosive, toxic, and combustible, the sealing of the stop valve is particularly important. The bellows, as an important component of the stop valve, can be sealed by stretching and compression, that is, the lower end of the bellows is sealed and welded to the valve disc, and the upper end is sealed and welded to the gland, so that the valve stem can be in a closed state during the lifting and moving process, thereby improving the sealing performance of the stop valve and effectively preventing the medium from leaking from the valve stem.

[0003] For example, the Chinese utility model patent with the publication number CN205350391U: Double-stem lifting bellows stop valve for chlorine and ammonia, its disclosed technical solution: a bellows is arranged on the lower valve stem, the lower valve stem is provided with a lower valve stem keyway, the bellows is provided with a bellows keyway matching the lower valve stem keyway, the lower valve stem and the bellows are connected by a key stop; it adopts a structure in which the upper and lower valve stems are threadedly connected, when in use, the upper valve stem only needs to be rotated and is in a semi-static state, which can ensure the sealing effect of the packing between the upper valve stem and the valve cover;

[0004] The existing bellows stop valve seal mainly relies on bellows and packing components, but there are the following problems: 1. Although the bellows is a key component of the stop valve, it is affected by the bellows production and installation process, as well as the use environment. The bellows is used for a long time or is overstretched, which causes the risk of deformation and rupture, thereby directly affecting the sealing performance and causing leakage of the conveyed medium; 2. The temperature of liquid chlorine is low during transportation. At low temperatures, the different thermal expansion coefficients between the seal and the valve body of the stop valve cause the sealing ring to shrink and harden, which will reduce the sealing performance; in addition, the stop valve is frequently opened and closed, and the valve disc and the valve seat are often in contact and wear, which also reduces the sealing performance of the stop valve. Summary of the invention

[0005] The present invention aims to provide a liquid chlorine delivery bellows stop valve, which has a simple and compact structure, improves the overall sealing performance by three-layer sealing of the valve cavity in the stop valve, avoids the sealing failure caused by long-term use of a single bellows, and the elastic sealing contact can compensate for the wear and deformation of the valve disc and the valve seat caused by long-term use, thereby avoiding the reduction of sealing performance.

[0006] To achieve the above purpose, the present invention provides a liquid chlorine delivery bellows stop valve, comprising:

[0007] The valve body, valve cover and valve stem components are provided with a channel for the liquid medium to enter and exit the valve body, and a valve seat located in the middle of the channel. The valve cover is sealed and installed on the valve body to form a valve cavity;

[0008] A valve stem component, the upper end of which passes through the valve cover and is connected to the driving component, and the lower end of which is connected to the valve disc so that the valve disc acts on the valve seat to open and close the channel;

[0009] A packing component is provided between the upper portion of the valve stem component and the valve cover;

[0010] Also includes:

[0011] A fixing member is located in the valve body and divides the valve cavity into an upper cavity and an lower cavity;

[0012] The first sealing component is located in the lower cavity and has a first bellows; the first bellows is sleeved on the outside of the valve stem component and welded and sealed between the fixing component and the valve disc; the valve stem component passes through the fixing component;

[0013] The second sealing component is located in the upper cavity and seals the peripheral side of the valve stem component.

[0014] In some examples of the present invention, the valve stem component has a first valve stem and a second valve stem that are coaxially arranged;

[0015] An inner cavity is provided at the lower end of the second valve stem, and a first elastic member is provided in the inner cavity;

[0016] The upper end of the first valve stem is slidably located in the inner cavity, and under the action of the first elastic member, the first valve stem is subjected to an elastic force toward the valve disc.

[0017] In some examples of the present invention, the second sealing component has a second bellows;

[0018] The second bellows is welded and sealed between the stem shoulder and the fixing member of the second valve stem.

[0019] In some examples of the present invention, the first bellows and the second bellows have the same specifications;

[0020] And in a non-stressed state, the length of the second bellows is greater than the sum of the length of the first bellows and the maximum compression amount of the first elastic member.

[0021] In some examples of the present invention, the second sealing component comprises a second elastic member, a pressure ring, and a second sealing member;

[0022] An annular cavity is provided between the fixing member and the second valve stem, and the second sealing member is located in the annular cavity; the second elastic member is sleeved on the second valve stem and is located between the shoulder of the second valve stem and the pressure ring;

[0023] The pressure ring is slidably mounted on the second valve stem and can contact the second sealing member.

[0024] In some examples of the present invention, a convex ring is provided around the lower end of the second valve stem;

[0025] The upper end surface of the convex ring is an "eight-shaped" conical surface, and the lower end of the fixing piece is provided with a conical inner angle;

[0026] The conical surface of the convex ring matches the conical inner angle of the fixing member. When the valve disc is in an open state relative to the valve seat, the conical surface of the convex ring and the conical inner angle of the fixing member contact and seal with each other.

[0027] In some examples of the present invention, the fixing member includes a first fixing member and a second fixing member;

[0028] The first fixture is located between the valve body and the valve cover, and the lower end thereof is connected with a first bellows;

[0029] The second fastener is threadedly mounted on the first fastener, with a first sealing member disposed therebetween. When the threads of the first fastener and the second fastener are close to each other, the first sealing member is in an extruded state.

[0030] In some examples of the present invention, the packing component includes:

[0031] A packing sleeve, which is sleeved on the valve stem component and is sealed and connected to the valve cover;

[0032] The packing member is located inside the packing plate and acts on the valve stem member;

[0033] The packing pressure plate is located in the upper cavity and is slidably located on the valve stem component. The packing pressure plate moves upward and can act on the packing member.

[0034] In some examples of the present invention, further comprising a detection component;

[0035] The detection component comprises a sleeve and a detection box; two ends of the sleeve are respectively and hermetically connected with the upper cavity and the detection box.

[0036] The present invention also aims to provide a sealing method for a liquid chlorine delivery bellows stop valve, wherein a first bellows is welded and sealed to be connected between a fixing member and a valve disc so that a medium is enclosed in a lower cavity to achieve a first layer of sealing for the medium, a second sealing component in an upper cavity performs a second layer of sealing on the circumference of a valve stem component, and a packing component performs a third layer of sealing on the valve stem component. Therefore, the multi-layer sealing can improve the sealing effect of the stop valve and avoid the situation where the bellows fails in sealing due to long-term use.

[0037] A sealing method for a liquid chlorine delivery bellows stop valve comprises the following steps:

[0038] S1, liquid chlorine medium enters the channel of the valve body from the upstream and is discharged from the downstream, the second valve stem drives the first valve stem to move axially, so that the valve disc opens and closes the valve seat, and when the valve disc closes the valve seat, the second valve stem elastically presses the first valve stem through the first elastic member;

[0039] S2, the first bellows is welded and sealed to be connected between the fixing piece and the valve disc, so that the medium is enclosed in the lower cavity, completing a layer of sealing for the medium;

[0040] S3, the second bellows is fixedly sealed and connected between the stem shoulder and the fixing member of the second valve stem, completing the second-layer sealing of the medium. At this time, under the non-stress condition, the length of the second bellows of the same specification is greater than the sum of the length of the first bellows and the maximum compression of the first elastic member, completing the second-layer sealing;

[0041] or:

[0042] When the valve stem component moves axially downward and the valve disc closes the valve seat, the second valve stem drives the second elastic component to move downward, and the second elastic component acts on the pressure ring to elastically squeeze the second sealing component, thereby increasing the contact and force between the second sealing component and the second valve stem, and completing the second layer of sealing in the upper cavity in the closed state; when the valve stem component moves axially upward and the valve disc opens the valve seat, the conical surface of the convex ring and the conical inner angle of the fixing component contact and seal with each other, completing the second layer of sealing in the first bellows in the open state;

[0043] S4, the packing component between the valve cover and the valve stem component, provides three-layer sealing for the valve stem component.

[0044] Compared with the prior art, the present invention is a liquid chlorine delivery bellows stop valve. The first bellows is welded and sealed to be connected between the fixing part and the valve disc so that the medium is enclosed in the lower cavity to achieve a first-layer seal on the medium. The second sealing component in the upper cavity performs a second-layer seal on the circumference of the valve stem component, and the packing component performs a third-layer seal on the valve stem component. Therefore, the multi-layer seal can improve the sealing effect of the stop valve and avoid the situation where the bellows fails to seal due to long-term use. In addition, the first valve stem and the second valve stem are connected by the first elastic component, so that the valve disc and the valve seat can be elastically sealed when the channel is closed, so as to compensate for the wear and deformation of the valve disc and the valve seat due to long-term use and avoid the reduction of sealing performance.

[0045] Since the second sealing component is a second bellows fixedly and sealingly connected between the stem shoulder of the second valve stem and the fixing member, and the length of the second bellows of the same specification is greater than the sum of the length of the first bellows and the maximum compression of the first elastic member, the excess length of the second bellows can compensate for the elastic compression of the first valve stem and the second valve stem, thereby preventing the second bellows from sealing failure before the first bellows, and reducing the risk of premature sealing failure;

[0046] Since the second sealing component includes a second elastic component, a pressure ring, and a second sealing component, the second elastic component acts on the pressure ring to elastically squeeze the second sealing component, thereby increasing the contact and force between the second sealing component and the second valve stem, thereby completing the double-layer sealing in the upper cavity in the closed state; in addition, when the valve stem component moves axially upward and the valve disc opens the valve seat, the conical surface of the convex ring and the conical inner angle of the fixing component contact and seal with each other, thereby completing the double-layer sealing in the first bellows in the open state. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a front view of Example 1 of the present invention;

[0048] Figure 2 yes Figure 1 A partial enlarged view of position A in the middle;

[0049] Figure 3 yes Figure 1 A partial enlarged view of the middle C position;

[0050] Figure 4 It is a front view of Example 2 of the present invention;

[0051] Figure 5 yes Figure 4 The main view of position B when the middle valve disc and valve seat are in the closed state;

[0052] Figure 6 yes Figure 4 The main view of position B with the middle valve disc and valve seat in the open state;

[0053] In the figure: 10, valve body, 11, valve seat;

[0054] 20. Valve cover;

[0055] 31. valve disc, 32. valve seat;

[0056] 41. first valve stem, 42. second valve stem, 421. convex ring, 422. conical surface, 43. first elastic member, 44. inner cavity;

[0057] 50. fixing member, 51. first fixing member, 52. second fixing member, 53. first sealing member;

[0058] 61. first bellows, 62. second bellows, 63. second elastic member, 64. pressure ring, 65. second sealing member;

[0059] 71. Packing piece, 72. Packing pressure plate, 73. Packing sleeve. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of specific embodiments of the present invention. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not necessarily indicate a quantity limitation. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0062] like Figure 1 , Figure 2 , Figure 4 As shown, the present invention is a liquid chlorine delivery bellows stop valve, comprising:

[0063] The valve body 10, the valve cover 20, and the valve stem component. The valve body 10 is provided with a channel for the liquid medium to enter and exit, and a valve seat 32 located in the middle of the channel. The valve cover 20 is sealed and installed on the valve body 10 to form a valve cavity.

[0064] A valve stem component, the upper end of which passes through the valve cover 20 and is connected to the driving component, and the lower end of which is connected to the valve flap 31 so that the valve flap 31 acts on the valve seat 32 to open and close the channel;

[0065] A packing component is provided between the upper portion of the valve stem component and the valve cover 20;

[0066] Also includes:

[0067] The fixing member 50 is located in the valve body 10 and divides the valve cavity into an upper cavity and an lower cavity;

[0068] The first sealing component is located in the lower cavity and has a first bellows 61. The first bellows 61 is sleeved on the outside of the valve stem component and welded and sealed between the fixing component 50 and the valve disc 31. The valve stem component passes through the fixing component 50.

[0069] A second sealing component is located in the upper cavity to seal the periphery of the valve stem component;

[0070] Specifically, the valve body 10, the valve cover 20, and the valve stem component are basic components of the stop valve, that is, the valve body 10 has an inlet channel and an outlet channel, the inlet channel and the outlet channel are staggered and connected to each other near the end, the valve flap 31 at the lower end of the valve stem component is connected to the valve seat 32 to open and close the connection position; the valve cover 20 is sealed and installed on the valve body 10, and a packing component is provided between the valve stem component and the valve body 10, the upper part of the valve stem component is connected to the driving component to realize the lifting and lowering of the valve stem component by rotation, the driving component can be hydraulically driven, directly driving the valve stem component to move axially without circumferential rotation, and the stroke of the valve stem component driven axially is limited, and is positioned at the limit position to ensure the opening and closing of the valve flap 31 and the valve seat 32, which are all existing structures and will not be further elaborated;

[0071] The sealing surface between the valve disc 31 and the valve seat 32 preferably adopts a conical surface seal, which has a larger cutting force and good sealing performance. The sealing surface can be made of hard alloy to ensure corrosion resistance and wear resistance.

[0072] The fixing member 50 is located in the valve body 10, and divides the valve cavity into an upper cavity and an lower cavity. The upper cavity can be formed by the inner wall of the valve cover 20, the fixing member 50, and the packing component, and the lower cavity is connected to the channel of the valve body 10;

[0073] The first sealing component is mainly the first bellows 61. The first bellows 61 can be made of double-layer or multi-layer stainless steel to maintain good elastic deformation. The first bellows 61 can be welded between the fixing member 50 and the valve disc 31 by argon arc welding, and separated from the valve stem component. At this time, when the valve stem component moves axially, the first bellows 61 elastically expands and contracts, and can form a good closed space with the valve stem component, effectively preventing liquid chlorine and other media from entering the first bellows 61 and the upper cavity from the valve cavity.

[0074] A second sealing component, located in the upper cavity, can further seal the periphery of the valve stem component;

[0075] When the present liquid chlorine delivery bellows stop valve is in use, liquid chlorine and other corrosive media enter the passage of the valve body 10 from the upstream and are then discharged from the downstream, and the valve stem component moves axially so that the valve disc 31 at its lower end opens and closes the valve seat 32;

[0076] The first bellows 61 is welded and sealed between the fixing part 50 and the valve disc 31, so that the medium is enclosed in the lower cavity, thereby realizing a layer of sealing for the medium. Affected by the welding process, assembly process and environment of the first bellows 61, when the first bellows 61 is used for a long time or is over-stretched to cause deformation, rupture, perforation and the like, thereby causing the sealing failure of the first bellows 61, the medium enters the upper cavity from the inside of the first bellows 61 and from the gap between the valve stem component and the fixing part 50. At this time, the second sealing component performs a second layer of sealing on the peripheral side of the valve stem component, and a packing component is provided between the valve cover 20 and the valve stem component. The packing component performs a three-layer sealing on the valve stem component, thereby meeting the strict leakage level requirements.

[0077] In some examples of the present invention, Figure 2 , Figure 5 As shown, the valve stem component has a first valve stem 41 and a second valve stem 42 arranged coaxially;

[0078] The lower end of the second valve stem 42 is provided with an inner cavity 44, and the inner cavity 44 is provided with a first elastic member 43;

[0079] The upper end of the first valve stem 41 is slidably located in the inner cavity 44, and under the action of the first elastic member 43, the first valve stem 41 is subjected to a downward elastic force;

[0080] Specifically, when the valve stem member moves axially so that the valve flap 31 opens and closes the valve seat 32, the valve flap 31 is often in rigid contact with the valve seat 32, which easily causes deformation or wear of the sealing surface, thereby reducing the sealing performance between the valve flap 31 and the valve seat 32;

[0081] The upper end of the second valve stem 42 is connected to the driving component, and the valve flap 31 is installed at the lower end of the first valve stem 41. The first valve stem 41 and the second valve stem 42 are elastically extended and retracted through the first elastic member 43. When the second valve stem 42 moves downward, the first valve stem 41 moves downward accordingly, so that the valve flap 31 is in elastic sealing contact with the valve seat 32.

[0082] In this example, the first valve stem 41 and the second valve stem 42 are connected by a first elastic member 43, so that the valve flap 31 and the valve seat 32 can be elastically sealed when the channel is closed, so as to compensate for the wear and deformation of the valve flap 31 and the valve seat 32 caused by long-term use and avoid the reduction of sealing performance.

[0083] Example 1

[0084] like Figure 1 , Figure 2 As shown, the second sealing component has a second bellows 62;

[0085] The second bellows 62 is fixedly and sealingly connected between the stem shoulder of the second valve stem 42 and the fixing member 50;

[0086] Specifically, the second sealing component is located in the upper cavity and may also be a second bellows 62. The second bellows 62 is also connected between the stem shoulder of the second valve stem 42 and the fixing member 50 by argon arc welding.

[0087] When the seal of the first bellows 61 fails, the medium enters the second bellows 62 from the inside of the first bellows 61 and from the gap between the valve stem component and the fixing member 50, which can prevent the medium from leaking to the outside and realize the double-layer seal around the valve stem component.

[0088] On the basis of Embodiment 1, further, the first bellows 61 and the second bellows 62 have the same specifications;

[0089] In a non-stressed state, the length of the second bellows 62 is greater than the sum of the length of the first bellows 61 and the maximum compression of the first elastic member 43;

[0090] Specifically, in actual use, when the first valve stem 41 and the second valve stem 42 do not move axially relative to each other, that is, the first elastic member 43 is not further compressed, during the axial movement of the valve stem component, the expansion and contraction amount of the first bellows 61 outside the first valve stem 41 is consistent with the expansion and contraction amount of the second bellows 62 outside the second valve stem 42;

[0091] The sealing performance of the first bellows 61 and the second bellows 62 is not only related to the production and assembly process, and the environment, but also to their own parameters. For example, when the same specifications are used, the same specifications mean that the first bellows 61 and the second bellows 62 use the same material, corrugation spacing, inner and outer diameters and wall thickness, pressure resistance and flexibility, etc. The sealing performance of the bellows is related to the expansion amount. For example, when the expansion amount of the bellows is large, the risk of bellows sealing failure is greater, and when the inner and outer diameters and wall thickness are small, the risk of bellows sealing failure is greater.

[0092] When the valve stem component elastically seals the valve seat 32, there is elastic compression between the first valve stem 41 and the second valve stem 42. Therefore, in order to avoid the sealing failure of the second bellows 62 before the first bellows 61 during the axial movement of the valve stem component, the length of the second bellows 62 is greater than the sum of the length of the first bellows 61 and the maximum compression of the first elastic member 43. The excess length of the second bellows 62 can compensate for the elastic compression of the first valve stem 41 and the second valve stem 42, thereby reducing the risk of premature sealing failure.

[0093] Example 2

[0094] like Figure 4 , Figure 5 , Figure 6 As shown, the second sealing component comprises a second elastic member 63, a pressure ring 64, and a second sealing member 65;

[0095] An annular cavity is provided between the fixing member 50 and the second valve stem 42, and the second sealing member 65 is located in the annular cavity; the second elastic member 63 is sleeved on the second valve stem 42 and is located between the stem shoulder of the second valve stem 42 and the pressure ring 64;

[0096] The pressure ring 64 is slidably mounted on the second valve stem 42 and is capable of contacting the second sealing member 65;

[0097] Specifically, the second sealing member 65 can be a pressure-resistant and corrosion-resistant elastic sealing ring, and multiple elastic sealing rings are arranged side by side in the annular cavity; when the valve stem component moves axially downward to close the valve disc 31 to the valve seat 32, the second valve stem 42 also drives the second elastic member 63 to move downward, and the second elastic member 63 acts on the pressure ring 64 to elastically squeeze the second sealing member 65, thereby increasing the contact and force between the second sealing member 65 and the second valve stem 42, improving the sealing performance, and completing the two-layer sealing of the upper cavity in the closed state;

[0098] In addition, when the upper part of the valve stem component is a threaded structure and the valve stem component is rotated by the driving component to realize the axial movement, a shaft seat can be rotated at the shoulder of the second valve stem 42, and the upper end of the second elastic member 63 contacts the shaft seat. The purpose is that when the second valve stem 42 is driven to rotate, the shaft seat can reduce the torque brought to the second elastic member 63 by the rotation of the second valve stem 42 and avoid excessive deformation of the second elastic member 63, that is, the second elastic member 63 is only compressed in the axial direction, and no circumferential torque is applied;

[0099] On the basis of Example 2, further, as Figure 6 As shown, a convex ring 421 is provided around the lower end of the second valve stem 42;

[0100] The upper end surface of the convex ring 421 is an "eight-shaped" conical surface 422, and the lower end of the fixing member 50 is provided with a conical inner angle;

[0101] The conical surface 422 of the convex ring 421 matches the conical inner angle of the fixing member 50. When the valve flap 31 is in an open state with respect to the valve seat 32, the conical surface 422 of the convex ring 421 and the conical inner angle of the fixing member 50 contact and seal with each other.

[0102] Specifically, the conical surface 422 of the convex ring 421 matches the conical inner angle of the fixing member 50. When the valve stem member moves axially upward and the valve disc 31 opens the valve seat 32, the conical surface 422 of the convex ring 421 and the conical inner angle of the fixing member 50 contact and seal with each other, completing the two-layer sealing of the first bellows 61 in the open state.

[0103] As explained, when the conical surface 422 of the protruding ring 421 and the conical inner angle of the fixing member 50 are in contact and sealed with each other, the valve stem component is at its maximum opening stroke.

[0104] In some examples of the present invention, Figure 2 , Figure 5 As shown, the fixing member 50 includes a first fixing member 51 and a second fixing member 52;

[0105] The first fixture 51 is located between the valve body 10 and the valve cover 20, and the lower end thereof is connected with a first bellows 61;

[0106] The second fixture 52 is threadedly mounted on the first fixture 51, and a first sealing member 53 is disposed therebetween. When the threads of the first fixture 51 and the second fixture 52 are close to each other, the first sealing member 53 is in an extruded state.

[0107] Specifically, the fixing member 50 may be an integral structure, which can ensure the sealing of the second bellows 62 in Example 1 and the second sealing member 65 in Example 2. However, there is a problem that the assembly is inconvenient. For example, when the second bellows 62 is welded between the fixing member 50 and the stem shoulder of the second valve stem 42 in Example 1, the assembly is difficult.

[0108] The first fixture 51 and the second fixture 52 are detachably connected while ensuring sealing, which can facilitate the assembly of the second sealing component.

[0109] In some examples of the present invention, Figure 3 As shown, the packing component comprises:

[0110] A packing sleeve 73, which is sleeved on the valve stem component and is sealed with the valve cover 20;

[0111] A packing member 71, located inside the packing pressure plate 72 and acting on the valve stem member;

[0112] A packing pressure plate 72 is located in the upper cavity and is slidably located on the valve stem component. The packing pressure plate 72 moves upward to act on the packing member 71;

[0113] Specifically, the packing component is located between the valve cover 20 and the valve stem component for three-layer sealing;

[0114] The packing sleeve 73 is mounted on the valve cover 20, and an annular groove is provided on the inner side thereof. The packing member 71 is located in the annular groove and contacts the valve stem member;

[0115] After the liquid chlorine medium leaks, the medium will change in form due to the influence of the surrounding environment, that is, from liquid to gas. When the liquid chlorine enters the upper cavity and gradually vaporizes, the air pressure in the upper cavity increases. At this time, the packing pressure plate 72 is equivalent to a piston, which moves on the valve stem component and can act on the packing piece 71. By pressurizing the packing piece 71, the contact and force between the packing piece 71 and the second valve stem 42 are increased to improve the three-layer sealing effect.

[0116] In some examples of the present invention, the liquid chlorine delivery bellows stop valve further includes a detection component;

[0117] The detection component comprises a sleeve and a detection box;

[0118] The two ends of the sleeve are respectively and hermetically connected to the upper cavity and the detection box;

[0119] Specifically, the detection box is equipped with a sensing system for detecting the corresponding medium;

[0120] The sleeve is connected to the upper cavity, for example, connected to the bottom end of the upper cavity, so that the detection box can detect liquid chlorine, or connected to the upper end of the upper cavity, so that the detection box can detect chlorine gas;

[0121] The detected signal can be transmitted to the control system, and the control system then controls the alarm component to send out an alarm signal.

[0122] The present invention relates to a liquid chlorine delivery bellows stop valve, which specifically comprises the following steps:

[0123] S1, liquid chlorine medium enters the channel of the valve body 10 from the upstream and is discharged from the downstream, the second valve stem 42 drives the first valve stem 41 to move axially, so that the valve disc 31 opens and closes the valve seat 32, and when the valve disc 31 closes the valve seat 32, the second valve stem 42 elastically presses the first valve stem 41 through the first elastic member 43;

[0124] S2, the first bellows 61 is welded and sealed between the fixing member 50 and the valve disc 31, so that the medium is enclosed in the lower cavity, completing a layer of sealing for the medium;

[0125] S3, the second bellows 62 is fixedly sealed and connected between the stem shoulder of the second valve stem 42 and the fixing member 50, completing the second layer of sealing for the medium. At this time, under the non-stress condition, the length of the second bellows 62 of the same specification is greater than the sum of the length of the first bellows 61 and the maximum compression of the first elastic member 43, completing the second layer of sealing;

[0126] or:

[0127] When the valve stem component moves axially downward and the valve disc 31 closes the valve seat 32, the second valve stem 42 drives the second elastic member 63 to move downward, and the second elastic member 63 acts on the pressure ring 64 to elastically squeeze the second sealing member 65, thereby increasing the contact and force between the second sealing member 65 and the second valve stem 42, and completing the double-layer sealing in the upper cavity in the closed state; when the valve stem component moves axially upward and the valve disc 31 opens the valve seat 32, the conical surface 422 of the convex ring 421 and the conical inner angle of the fixing member 50 contact and seal with each other, completing the double-layer sealing in the first bellows 61 in the open state;

[0128] S4, a packing component between the valve cover 20 and the valve stem component, performs three-layer sealing on the valve stem component.

[0129] An exemplary implementation of a liquid chlorine delivery bellows stop valve proposed in the present invention is described in detail above with reference to a preferred embodiment. However, it can be understood by those skilled in the art that, without departing from the concept of the present invention, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present invention can be combined in various ways without exceeding the protection scope of the present invention, which is determined by the attached claims.

Claims

1. A liquid chlorine delivery bellows stop valve, comprising: A valve body (10), a valve cover (20), and a valve stem component. The valve body (10) is provided with a channel for liquid medium to enter and exit, and a valve seat (32) located in the middle of the channel. The valve cover (20) is sealingly mounted on the valve body (10) to form a valve cavity. A valve stem component, the upper end of which passes through the valve cover (20) and is connected to the driving component, and the lower end of which is connected to the valve flap (31) so that the valve flap (31) acts on the valve seat (32) to open and close the channel; A packing component is provided between the upper portion of the valve stem component and the valve cover (20); It is characterized by further comprising: A fixing member (50) is located in the valve body (10) and divides the valve cavity into upper and lower cavities; A first sealing component is located in the lower cavity and has a first bellows (61); the first bellows (61) is sleeved on the outside of the valve stem component and welded and sealed between the fixing component (50) and the valve disc (31); the valve stem component passes through the fixing component (50); The second sealing component is located in the upper cavity and seals the peripheral side of the valve stem component.

2. A liquid chlorine delivery bellows stop valve according to claim 1, characterized in that: The valve stem component comprises a first valve stem (41) and a second valve stem (42) which are coaxially arranged; An inner cavity (44) is provided at the lower end of the second valve stem (42), and a first elastic member (43) is provided in the inner cavity (44); The upper end of the first valve stem (41) is slidably located in the inner cavity (44), and under the action of the first elastic member (43), the first valve stem (41) is subjected to an elastic force toward the valve flap (31).

3. A liquid chlorine delivery bellows stop valve according to claim 2, characterized in that: The second sealing component has a second bellows (62); The second bellows (62) is welded and sealed between the stem shoulder of the second valve stem (42) and the fixing member (50).

4. A liquid chlorine delivery bellows stop valve according to claim 3, characterized in that: The first bellows (61) and the second bellows (62) have the same specifications; Furthermore, in a non-stressed state, the length of the second bellows (62) is greater than the sum of the length of the first bellows (61) and the maximum compression amount of the first elastic member (43).

5. A liquid chlorine delivery bellows stop valve according to claim 2, characterized in that: The second sealing component comprises a second elastic member (63), a pressure ring (64), and a second sealing member (65); An annular cavity is provided between the fixing member (50) and the second valve stem (42), and the second sealing member (65) is located in the annular cavity; the second elastic member (63) is sleeved on the second valve stem (42) and is located between the stem shoulder of the second valve stem (42) and the pressure ring (64); The pressure ring (64) is slidably mounted on the second valve stem (42) and is capable of contacting the second sealing member (65).

6. A liquid chlorine delivery bellows stop valve according to claim 5, characterized in that: A convex ring (421) is provided on the circumference of the lower end of the second valve stem (42); The upper end surface of the convex ring (421) is an "eight-shaped" conical surface (422), and the lower end of the fixing member (50) is provided with a conical inner angle; The conical surface (422) of the convex ring (421) matches the conical inner angle of the fixing member (50); when the valve flap (31) is in an open state relative to the valve seat (32), the conical surface (422) of the convex ring (421) and the conical inner angle of the fixing member (50) contact and seal with each other.

7. A liquid chlorine delivery bellows stop valve according to claim 4 or 6, characterized in that: The fixing member (50) comprises a first fixing member (51) and a second fixing member (52); The first fixing member (51) is located between the valve body (10) and the valve cover (20), and a first bellows (61) is connected to the lower end thereof; The second fixture (52) is threadedly mounted on the first fixture (51), and a first sealing member (53) is arranged therebetween. When the threads of the first fixture (51) and the second fixture (52) are threadedly approaching each other, the first sealing member (53) is in a squeezed state.

8. A liquid chlorine delivery bellows stop valve according to any one of claims 1 to 6, characterized in that: The packing component comprises: A packing sleeve (73) is sleeved on the valve stem component and is sealed and connected to the valve cover (20); A packing member (71) is located inside the packing pressure plate (72) and acts on the valve stem member; The packing pressure plate (72) is located in the upper cavity and is slidably located on the valve stem component. The packing pressure plate (72) moves upward and can act on the packing member (71).

9. A liquid chlorine delivery bellows stop valve according to any one of claims 1 to 6, characterized in that: Also included is a component for detecting; The detection component comprises a sleeve and a detection box; two ends of the sleeve are respectively and hermetically connected with the upper cavity and the detection box.

10. A sealing method for a liquid chlorine delivery bellows stop valve according to claim 4 or 6, characterized in that: The specific steps include: S1, liquid chlorine medium enters the passage of the valve body (10) from the upstream and is then discharged from the downstream, the second valve stem (42) drives the first valve stem (41) to move axially, so that the valve flap (31) opens and closes the valve seat (32), and when the valve flap (31) closes the valve seat (32), the second valve stem (42) elastically presses the first valve stem (41) through the first elastic member (43); S2, the first bellows (61) is welded and sealed between the fixing member (50) and the valve flap (31), so that the medium is enclosed in the lower cavity, completing a layer of sealing for the medium; S3, the second bellows (62) is fixedly sealed and connected between the stem shoulder of the second valve stem (42) and the fixing member (50), completing a two-layer seal for the medium. At this time, under a non-stressed condition, the length of the second bellows (62) of the same specification is greater than the sum of the length of the first bellows (61) and the maximum compression of the first elastic member (43), completing a two-layer seal; or: When the valve stem component moves axially downward and the valve disc (31) closes the valve seat (32), the second valve stem (42) drives the second elastic member (63) to move downward, and the second elastic member (63) acts on the pressure ring (64) to elastically squeeze the second sealing member (65), thereby increasing the contact and force between the second sealing member (65) and the second valve stem (42), and completing the double-layer sealing in the upper cavity in the closed state; when the valve stem component moves axially upward and the valve disc (31) opens the valve seat (32), the conical surface (422) of the convex ring (421) and the conical inner angle of the fixing member (50) contact and seal with each other, and completing the double-layer sealing in the first bellows (61) in the open state; S4, a packing component between the valve cover (20) and the valve stem component, performs a three-layer seal on the valve stem component.

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