Protective device for mechanical seal

Abstract

The utility model discloses a protection device for a mechanical seal, which relates to the technical field of mechanical seal accessories and comprises a cold water passage, an oil storage part and a driving structure. The cooling water passage is connected to the mechanical seal, a detection device is arranged in the cooling water passage and used for obtaining the liquid flow in the passage, the oil storage piece is used for storing oil, one end of the oil storage piece is communicated with the mechanical seal, the driving structure is used for being connected with a moving ring of the mechanical seal, and the driving structure is used for driving the oil storage piece to rotate. The detection device is electrically connected with the driving structure and the oil storage piece; according to the mechanism, the rotating speed of the driving machine can be adjusted according to the supply amount of cooling water, and certain lubricating oil is synchronously provided for the mechanical seal, so that dual protection is realized, and the situation that the mechanical seal is damaged due to dry rotation in the using process is effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical seal accessory technology field, in particular to a protection device of mechanical seal. BACKGROUND

[0002] Mechanical seal refers to the device that prevents fluid leakage by at least one pair of end faces perpendicular to the rotation axis under the action of fluid pressure and elastic force of compensation mechanism and the cooperation of auxiliary seal. The common mechanical seal structure is composed of stationary ring, rotating ring, elastic element spring seat, set screw, rotating ring auxiliary seal ring and stationary ring auxiliary seal ring and other elements, and the anti-rotation pin is fixed on the gland to prevent the rotation of the stationary ring. The rotating ring and the stationary ring are often also called compensation ring or non-compensation ring according to whether they have axial compensation capacity.

[0003] When the mechanical seal works, the two sealing surfaces of the dynamic and static rings are not dry friction, and mechanical seal cooling water needs to be passed between the sealing surfaces. In the actual operation process, the mechanical seal device is often dry due to various reasons. For example, the sealing water is interrupted and the equipment does not obtain information in time. The mechanical seal will cause sealing ring thermal cracking or burning and failure due to dry friction. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a protection device of mechanical seal, which aims to solve the problem of easy damage due to insufficient cooling water supply in the working process of mechanical seal.

[0005] In order to achieve the above purpose, the protection device of mechanical seal provided by the utility model comprises:

[0006] Cooling water passage connected to the mechanical seal, and detection device is arranged in the cooling water passage to obtain the liquid flow in the passage;

[0007] Oil storage part for storing oil, and one end of the oil storage part is connected to the mechanical seal; and

[0008] Driving structure for connecting the dynamic ring of the mechanical seal;

[0009] The detection device is electrically connected with the driving structure and the oil storage part.

[0010] In an embodiment, a water inlet pipe is arranged on the cooling water inlet end of the mechanical seal, and a three-way valve is arranged on one end of the water inlet pipe;

[0011] The cooling water passage and one end of the oil storage part are connected to the three-way valve.

[0012] In an embodiment, the oil storage member is provided with an oil guiding pipe portion at one end thereof, the other end of the oil guiding pipe portion is connected to the three-way valve, and the oil guiding pipe portion is provided with a valve body assembly.

[0013] In an embodiment, the valve body assembly comprises a flow control valve, which is arranged on the oil guiding pipe portion for quantitatively adding oil into the water inlet pipe.

[0014] In an embodiment, the valve body assembly further comprises a first one-way valve;

[0015] The first one-way valve is arranged on the oil guiding pipe portion between the flow control valve and the oil storage member, for defining one-way flow of oil from the oil storage member to the flow control valve; and / or,

[0016] The flow control valve is configured as an electromagnetic valve.

[0017] In an embodiment, the cooling water passage comprises a water supply element and a water guiding pipe portion, the water supply element is connected to the water guiding pipe portion for supplying water into the water guiding pipe portion;

[0018] The other end of the water guiding pipe portion is connected to the three-way valve.

[0019] In an embodiment, the detection device is arranged in the water guiding pipe portion;

[0020] The cooling water passage further comprises a second one-way valve, which is arranged on the water guiding pipe portion at a position corresponding to the detection device and the water supply element, for limiting one-way flow of water from the water supply element to the detection device.

[0021] In an embodiment, the driving structure comprises a driving machine and a transmission shaft, the driving machine is connected to the transmission shaft for driving the transmission shaft to rotate about its own axis;

[0022] The other end of the transmission shaft is connected to the dynamic ring of the mechanical seal.

[0023] In an embodiment, the oil storage member is specifically configured as an oil tank, the oil tank is provided with an oil outlet, and one end of the oil guiding pipe portion is connected to the oil outlet.

[0024] In an embodiment, the mechanical seal is further provided with a water outlet pipe at the cooling water outlet end thereof.

[0025] The utility model discloses a monitoring device and drive machine and spare oil tank solenoid valve correspond, when detecting device cannot detect cooling water interlock drive machine alarm, interlock structure can open the electromagnetic valve structure of oil storage tank, effectively avoid the mechanical seal damage that mechanical seal dry running no cooling water brings, and in the process of shutdown and the process of waiting water source recovery, because the oil leakage lubrication of solenoid valve, can realize double protection, and then can ensure that mechanical seal short time will not be damaged. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, below will to the embodiment or prior art description needed to use the drawing make a simple introduction, obviously, the following description in the drawing is only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, can also obtain other drawings according to the structure shown in these drawings.

[0027] Figure 1 It is the whole structure schematic diagram of the embodiment of the protection device of mechanical seal provided by the utility model.

[0028] EXPLANATION OF DRAWINGS:

[0029] 100, the protection device of mechanical seal;1, mechanical seal;11, oil guide pipeline part;12, valve body assembly;121, flow control valve;122, first check valve;13, oil tank;131, oil outlet;2, cooling water passage;21, water supply element;22, water guide pipeline part;23, detection device;24, second check valve;3, drive structure;31, drive machine;32, transmission shaft;4, three-way valve;5, water outlet pipe;6, water inlet pipe.

[0030] The utility model discloses the realization, functional characteristics and advantages will be further described with reference to the embodiment. DETAILED DESCRIPTION

[0031] The technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiments of the utility model, obviously, the described embodiments are only a 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 scope of the utility model protection.

[0032] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, if the certain posture changes, the directional indications also change accordingly.

[0033] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0034] Mechanical seal refers to the device for preventing fluid leakage by at least one pair of end faces perpendicular to the rotation axis under the action of fluid pressure and elastic force of compensation mechanism and the cooperation of auxiliary seal. The commonly used mechanical seal structure is composed of stationary ring, rotating ring, elastic element spring seat, locking screw, rotating ring auxiliary seal ring and stationary ring auxiliary seal ring and other elements, and the anti-rotation pin is fixed on the gland to prevent the stationary ring from rotating. The rotating ring and the stationary ring are often also called compensation ring or non-compensation ring according to whether they have axial compensation capacity.

[0035] When the mechanical seal works, the two sealing surfaces of the dynamic and static rings are not dry friction, and mechanical seal cooling water needs to be passed between the sealing surfaces. In the actual operation process, the mechanical seal device often dry runs due to various reasons. For example, the sealing water is interrupted and the equipment does not obtain information in time. The mechanical seal will cause sealing ring thermal cracking or burning and failure due to dry friction.

[0036] The utility model provides a kind of protection device 100 of mechanical seal for solving above problems.

[0037] Please refer to Figure 1 In an embodiment of the utility model, the protection device 100 of the mechanical seal 1 includes cooling water passage, oil storage part and driving structure 3. The cooling water passage 2 is connected to the mechanical seal 1, and the detection device 23 is arranged in the cooling water passage 2, to obtain the liquid flow in the passage, the oil storage part is used to store oil, and one end of the oil storage part is connected to the mechanical seal 1, and the driving structure 3 is used to connect the dynamic ring of the mechanical seal 1, wherein the detection device 23 is electrically connected with the driving structure 3 and the oil storage part.

[0038] In the above embodiment, the driving structure 3 is connected to the dynamic ring structure in the mechanical seal 1, and when the driving structure 3 is working, it can drive the dynamic ring in the mechanical seal 1 to rotate. It should be noted that in the mechanical seal 1, the dynamic ring is an important component, which is generally connected to the rotating shaft body to form a rotating pair structure. At the same time, the mechanical seal 1 also includes a static ring, which generally remains relatively static during use. Therefore, during the use of the mechanical seal 1, relative rotation occurs between the static ring and the dynamic ring. Therefore, in order to prevent the mechanical seal 1 from increasing the friction between the dynamic ring and the static ring due to dry running, cooling water is generally supplied between the sealing surfaces to prevent the sealing rings on the static ring and the dynamic ring from being damaged due to frictional heating.

[0039] In the above structure, the cooling water passage is connected to the mechanical seal 1, and in the normal use state, cooling water can be supplied to the mechanical seal 1 through the cooling water passage to increase the humidity between the dynamic and static ring structures and to timely remove the heat generated between the two due to relative rotation. However, in some cases, there may be insufficient or untimely supply of cooling water. For example, when the entire device is just starting to operate, the driving structure 3 drives the dynamic ring to rotate, and at this time, the water in the cooling water passage 2 may not be able to be supplied in large quantities due to the long extension length of the pipeline or the low rotation speed of the pump body. At this time, dry running is prone to occur. Or the situation where the water supply cannot be achieved due to insufficient water storage. The oil storage member in the present scheme can be set as a short conduction flow path and connected to the mechanical seal 1. When the detection device 23 detects that the water flow in the cooling water passage 2 is small, a certain amount of lubricating oil can be introduced into the mechanical seal 1 in the oil storage member. The lubricating oil can flow between the dynamic ring and the static ring to lubricate the relative rotation of the dynamic ring and the static ring. At this time, the friction between the two can be better reduced, thereby effectively avoiding the situation of frictional heating.

[0040] In addition, it is contemplated that the lubricating effect of the lubricating oil stored in the oil storage member is stronger than that of the cooling water. Therefore, when the oil storage member introduces lubricating oil into the mechanical seal 1, a smaller amount of lubricating oil can be introduced to achieve better lubrication effect and ensure a longer normal cooling water recovery time. In actual work, in order to further ensure the rotation effect between the dynamic and static rings, the lubricating oil can be continuously supplied and maintained at a small flow rate, so that part of the heat generated during the relative rotation of the dynamic and static rings can be removed simultaneously during the lubrication process. When the detection device 23 detects that the cooling water flow has recovered, the oil storage member can stop the supply of lubricating oil, and the dynamic and static rings can be lubricated and cooled by sufficient cooling water.

[0041] In one embodiment of the utility model, the water inlet pipe 6 is arranged on the cooling water inlet end of the mechanical seal 1, a three-way valve 4 is arranged on one end of the water inlet pipe 6, the cooling water passage 2 and one end of the oil storage member are connected to the three-way valve 4. The water inlet pipe 6 is the liquid inlet structure of the mechanical seal 1, a three-way valve 4 is arranged on one end of the water inlet pipe 6 to provide two end interfaces, and the two end structures are connected to the cooling water passage 2 and the oil storage member respectively. Therefore, during the working process of the whole device, the cooling water passage 2 and the oil storage member can form two separate control passages, thereby facilitating the separate control of water inlet and oil inlet.

[0042] Specifically, an oil guide pipeline part 11 is arranged on one end of the oil storage member, the other end of the oil guide pipeline part 11 is connected to the three-way valve 4, and a valve body assembly 12 is arranged on the oil guide pipeline part 11. The oil storage member is specifically arranged as an oil tank 13 in this embodiment, an oil outlet 131 is arranged on the oil tank 13, and one end of the oil guide pipeline part 11 is connected to the oil outlet 131. When the water flow in the cooling water pipeline is small, the oil tank 13 delivers part of the lubricating oil to the water inlet pipe 6 through the oil guide pipeline part 11, and during this process, the valve body assembly 12 on the oil guide pipeline part 11 can control the lubricating oil flow in the oil guide pipeline part 11 in real time.

[0043] In actual implementation, a corresponding oil storage amount sensing device can be arranged on the oil tank 13, and when the oil amount is small, relevant personnel can be reminded to supplement the lubricating oil.

[0044] The valve body assembly 12 includes a flow control valve 121, which is arranged on the oil guide pipeline to quantitatively add oil to the water inlet pipe 6. The flow control valve 121 can be specifically arranged as an electromagnetic valve structure, and the opening degree of the electromagnetic valve can be controlled in real time through a control device.

[0045] Furthermore, the valve body assembly 12 also includes a first one-way valve 122, which is arranged on the oil guide pipeline between the flow control valve 121 and the oil storage member to limit the one-way flow of oil from the oil storage member to the flow control valve 121. The arrangement of the first one-way valve 122 can control the flow direction of the lubricating oil in the oil guide pipeline part 11, avoid the backflow of the lubricating oil, and thereby improve the working stability of the whole oil supply line.

[0046] In an embodiment of the utility model, the cooling water passage 2 includes water supply element 21 and water guide pipe section 22, water supply element 21 is connected to water guide pipe section 22 to supply water to water guide pipe section 22, the other end of water guide pipe section 22 is connected to three-way valve 4. Water supply element 21 can be set as water tank and pump body structure, in actual use, the cooling water in water tank is delivered to water guide pipe section 22 by pump body. Water outlet pipe 5 is also arranged on the outlet end of mechanical seal 1. In actual design, water outlet pipe 5 is connected to water tank to form the circulation flow of cooling water.

[0047] Detection device 23 is installed in water guide pipe section 22, cooling water passage 2 also includes second check valve 24, second check valve 24 is arranged on water guide pipe section 22 between detection device 23 and water supply element 21 to limit the one-way flow of water from water supply element 21 to detection device 23. Like oil supply pipeline, second check valve 24 is arranged on water guide pipe section to avoid the backflow of cooling water in water guide pipe section.

[0048] Drive structure 3 includes drive machine 31 and transmission shaft 32, drive machine 31 is connected to transmission shaft 32 to drive transmission shaft 32 to rotate around its own axis, the other end of transmission shaft 32 is connected to the moving ring of mechanical seal 1. During the use of mechanical seal 1, drive machine 31 drives transmission shaft 32 to rotate, and transmission shaft 32 drives the moving ring of mechanical seal 1 to rotate. In actual work, detection device 23 can monitor the flow of water in water guide pipe section 22, when the water flow in water guide pipe section 22 is small, detection device 23 can send control signal and control the rotation speed of drive machine 31 to reduce. And in this process, the electromagnetic valve on oil guide pipe section 11 is opened to a certain degree to introduce a small amount of lubricating oil into water inlet pipe 6 for lubrication. Thus, double protection is realized, which avoids the high-speed relative rotation between the moving ring and the static ring, and also lubricates through lubricating oil. The mechanical seal structure is protected as much as possible.

[0049] The above is only an exemplary embodiment of the utility model, and does not limit the patent range of the utility model, any equivalent structural transformation made by using the utility model specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A protection device for mechanical seals, characterized in that, The mechanical seal comprises: a cooling water passage connected to the mechanical seal, and a detection device arranged in the cooling water passage for obtaining the flow of liquid in the passage; an oil storage member for storing oil, and one end of the oil storage member being in communication with the mechanical seal; and a driving structure for connecting the rotating ring of the mechanical seal; the detection device is electrically connected to the driving structure and the oil storage member. A water inlet pipe is arranged on the cooling water inlet end of the mechanical seal, and a three-way valve is arranged on one end of the water inlet pipe; 2. The mechanical seal protection device of claim 1, wherein one end of the cooling water passage and one end of the oil storage member are connected to the three-way valve. An oil guide pipe is arranged on one end of the oil storage member, the other end of the oil guide pipe is connected to the three-way valve, and a valve body assembly is arranged on the oil guide pipe.

3. The mechanical seal protection device of claim 2, wherein The valve body assembly comprises a flow control valve arranged on the oil guide pipe for quantitatively adding oil to the water inlet pipe.

4. The mechanical seal protection device of claim 3, wherein The valve body assembly further comprises a first one-way valve; 5. The mechanical seal protection device of claim 4, wherein the first one-way valve is arranged on the oil guide pipe between the flow control valve and the oil storage member for limiting the one-way flow of oil from the oil storage member to the flow control valve; and / or the flow control valve is an electromagnetic valve. The cooling water passage comprises a water supply element and an oil guide pipe, and the water supply element is connected to the oil guide pipe for supplying water to the oil guide pipe; 6. The mechanical seal protection device of claim 2, wherein the other end of the oil guide pipe is connected to the three-way valve. The detection device is arranged in the oil guide pipe; 7. A mechanical seal protection device according to claim 6, characterized in that the cooling water passage further comprises a second one-way valve arranged on the oil guide pipe corresponding to the position between the detection device and the water supply element for limiting the one-way flow of water from the water supply element to the detection device. The driving structure comprises a driving machine and a transmission shaft, and the driving machine is connected to the transmission shaft for rotating the transmission shaft about its own axis; 8. The mechanical seal protection device of claim 1, wherein the other end of the transmission shaft is connected to the rotating ring of the mechanical seal. The oil storage member is specifically an oil tank, and an oil outlet is arranged on the oil tank, and one end of the oil guide pipe is connected to the oil outlet.

9. The mechanical seal protection device of claim 4, wherein A water outlet pipe is further arranged on the cooling water outlet end of the mechanical seal.

10. The mechanical seal protection device of claim 1, wherein ​

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