A pressure vessel agitator sealing fluid system

Abstract

This utility model discloses a sealing fluid system for a pressure vessel agitator, configured to provide sealing fluid to the sealing components of the pressure vessel agitator. The sealing components have a receiving cavity for containing the sealing fluid, including a storage tank, a delivery assembly, and a return assembly. The delivery assembly includes a delivery pump, with its inlet end connected to the storage tank and its outlet end connected to the receiving cavity. The return assembly includes a return pipe and a hydraulically controlled check valve. One end of the return pipe is connected to the receiving cavity, and the other end is connected to the storage tank. The hydraulically controlled check valve is positioned in the flow path of the return pipe, and its control port is connected to the outlet end of the delivery pump. When the outlet pressure of the delivery pump is less than a set value, the hydraulically controlled check valve closes the return pipe. This utility model can prevent the sealing fluid from returning to the storage tank via the return pipe when the delivery pump stops.

Description

Technical Field

[0001] This utility model relates to the field of sealing fluid technology for pressure vessel agitators, and specifically to a sealing fluid system for pressure vessel agitators. Background Technology

[0002] Some pressure vessels are equipped with a stirrer, and a seal is installed between the stirrer and the pressure vessel. The rotating stirrer is sealed by the sealant. The principle is that when the sealing fluid passes through the sealant, it forms a water film between the stirrer shaft and the sealant, preventing the medium in the pressure vessel from leaking out through the gap between the shaft and the sealant, thus avoiding a large loss of working fluid. At the same time, the sealing fluid also carries away the heat transferred from the stirrer shaft to the bearing, preventing the bearing temperature from rising. However, when the sealing fluid loses a certain pressure and flow rate, the water film between the stirrer shaft and the sealant is damaged, and friction will occur between the stirrer shaft and the sealant, increasing the stirring vibration. In severe cases, this will damage the stirring mechanism.

[0003] CN206793672 discloses a sealing fluid system for an oxygen autoclave agitator, comprising a sealing fluid storage tank, a circulating pump, a main outlet pipe, outlet branch pipes, a main return pipe, and return branch pipes. A first flow meter and a first pressure transmitter are installed at the end of the main outlet pipe connected to the outlet of the circulating pump. A second flow meter is installed on each return branch pipe. A second pressure transmitter is installed at the end of the main return pipe connected to the sealing fluid storage tank. The first flow meter, the first pressure transmitter, the second flow meter, and the second pressure transmitter are all connected to the input terminal of a DCS system. The output terminal of the DCS system is connected to the control terminal of an alarm.

[0004] When the delivery pump experiences a power outage or other abnormal situation, the sealing fluid with a certain pressure in the agitator's seal will return to the sealing fluid storage tank through the main return water pipe, causing a decrease in the hydraulic pressure in the seal and making it impossible to effectively seal the agitator shaft and the seal. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a sealing fluid system for a pressure vessel agitator, which solves the technical problem in the prior art that when the delivery pump experiences abnormal situations such as power failure, the sealing fluid in the seal of the agitator will return to the sealing fluid storage tank through the main return water pipe.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In a first aspect, this utility model provides a sealing fluid system for a pressure vessel agitator, wherein the pressure vessel agitator is sealed by a sealing element, the sealing element having a receiving cavity into which the sealing fluid enters, and the pressure vessel agitator sealing fluid system includes: reservoir; A delivery assembly includes a delivery pump, wherein the inlet end of the delivery pump is connected to the storage tank and the outlet end is connected to the receiving cavity; and The reflux assembly includes a reflux pipe and a hydraulically controlled check valve. One end of the reflux pipe is connected to the receiving cavity and the other end is connected to the liquid storage tank. The hydraulically controlled check valve is disposed on the flow path of the reflux pipe, and the hydraulic control port of the hydraulically controlled check valve is connected to the liquid outlet of the delivery pump. When the liquid outlet pressure of the delivery pump is less than a set value, the hydraulically controlled check valve closes the reflux pipe.

[0007] In one embodiment, the delivery assembly further includes a first check valve disposed on the flow path between the delivery pump and the receiving cavity, for unidirectional flow from the delivery pump to the receiving cavity.

[0008] In one embodiment, the delivery assembly further includes the accumulator disposed on the flow path between the first check valve and the receiving cavity.

[0009] In one embodiment, the number of conveying pumps in the conveying assembly is multiple; The conveying assembly also includes a conveying pipe, one end of which is connected to the liquid outlet of the plurality of conveying pumps, and the other end is connected to the receiving cavity; The hydraulic control port of the hydraulic control check valve is connected to the outlet of each of the multiple delivery pumps.

[0010] In one embodiment, the reflux assembly further includes a filter disposed in the flow path of the reflux pipe.

[0011] In one embodiment, the reflux assembly further includes a heat exchanger having a heat exchange channel disposed on the flow path of the reflux pipe and a cooling channel capable of exchanging heat with the heat exchange channel.

[0012] In one embodiment, the sealing fluid system of the pressure vessel agitator further includes a sealing assembly, which includes an inlet pipe, an outlet pipe, and a second check valve. The receiving cavity is connected to the delivery pipe via the inlet pipe, and the receiving cavity is connected to the return pipe via the outlet pipe. The second check valve is disposed on the outlet pipe for one-way flow from the receiving cavity to the return pipe.

[0013] In one embodiment, there are multiple sealing assemblies, in which multiple inlet pipes are connected to the delivery pipe, and multiple outlet pipes are connected to the return pipe.

[0014] In one embodiment, the sealing assembly further includes a first flow meter disposed on the outlet pipe.

[0015] In one embodiment, the reflux assembly further includes a second flow meter disposed in the reflux pipe.

[0016] Compared with the prior art, the sealing fluid system for the pressure vessel agitator provided by this utility model, when it is necessary to seal the agitator shaft of the pressure vessel agitator, starts the delivery pump, which pumps the sealing fluid from the storage tank into the receiving cavity of the sealing element. The agitator is sealed by the pumped sealing fluid. After the sealing fluid in the receiving cavity flows out, it enters the return pipe and returns to the storage tank through the return pipe. Therefore, when the sealing fluid flows through the return pipe, it will pass through the hydraulic control check valve. When the delivery pump stops, the outlet pressure of the delivery pump is less than the set value. At this time, the hydraulic control check valve closes, which can prevent the sealing fluid from passing through the return pipe and prevent the sealing fluid in the receiving cavity from returning to the storage tank through the return pipe when the delivery pump stops. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the sealing fluid system of the pressure vessel stirrer provided in an embodiment of this utility model.

[0018] Explanation of reference numerals in the attached figures: Reservoir tank 1; Conveying assembly 2; Conveying pump 21; First check valve 22; Accumulator 23; Conveying pipe 24; First shut-off valve 25; Drain pipe 26; Drain valve 27; Reflux assembly 3; reflux pipe 31; hydraulic control check valve 32; hydraulic control port 32a; filter 33; self-regulating pressure reducing valve 34; drain pipe 35; drain valve 36; heat exchanger 37; second flow meter 38; Seal 4; Receiving cavity 4a; Sealing assembly 5; inlet pipe 51; outlet pipe 52; second check valve 53; second shut-off valve 54; first flow meter 55; third shut-off valve 56. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] To address the technical problem that sealing fluid in the agitator's seals returns to the sealing fluid storage tank via the main return pipe when the delivery pump experiences abnormal conditions such as power outages, this invention provides a sealing fluid system for a pressure vessel agitator, which can prevent the sealing fluid in the agitator's seals from returning to the sealing fluid storage tank when the delivery pump experiences abnormal conditions such as power outages.

[0021] Please see Figure 1 , Figure 1 This is a schematic diagram of the sealing fluid system of the pressure vessel agitator in one embodiment of the present invention. The pressure vessel agitator is sealed by a sealing element 4. The sealing element 4 provides a receiving cavity 4a for the sealing fluid. The sealing element 4 includes a storage tank 1, a conveying component 2, and a return component 3. The conveying component 2 includes a conveying pump 21. The inlet end of the conveying pump 21 is connected to the storage tank 1, and the outlet end is connected to the receiving cavity 4a. The return component 3 includes a return pipe 31 and a hydraulic control check valve 32. One end of the return pipe 31 is connected to the receiving cavity 4a, and the other end is connected to the storage tank 1. The hydraulic control check valve 32 is located on the flow path of the return pipe 31, and the hydraulic control port 32a of the hydraulic control check valve 32 is connected to the outlet end of the conveying pump 21. When the outlet pressure of the conveying pump 21 is less than a set value, the hydraulic control check valve 32 closes the return pipe 31. It should be understood that the liquid outlet pressure setting value is the value set by the hydraulic control check valve 32 itself, which can be 1N, 2N, etc.

[0022] When it is necessary to seal the agitator shaft of the pressure vessel, the transfer pump 21 is started. The transfer pump 21 pumps the sealing liquid in the storage tank 1 into the receiving cavity 4a of the sealing component 4. The agitator is sealed by the pumped sealing liquid. After the sealing liquid in the receiving cavity 4a flows out, it enters the return pipe 31 and returns to the storage tank 1 through the return pipe 31. Therefore, when the sealing liquid flows through the return pipe 31, it will flow through the hydraulic control check valve 32. When the transfer pump 21 stops, the liquid pressure at the outlet of the transfer pump 21 is less than the set value. At this time, the hydraulic control check valve 32 closes, which can prevent the sealing liquid from passing through the return pipe 31 and prevent the sealing liquid in the receiving cavity 4a from returning to the storage tank 1 through the return pipe 31 when the transfer pump 21 stops.

[0023] To prevent the sealing fluid in the receiving cavity 4a from flowing back to the storage cavity when the delivery pump 21 stops, in one embodiment, the delivery assembly 2 further includes a first check valve 22, which is disposed on the flow path between the delivery pump 21 and the receiving cavity 4a for one-way flow from the delivery pump 21 to the receiving cavity 4a.

[0024] In this embodiment, by setting a first check valve 22, the sealing liquid output by the delivery pump 21 can pass through. When the delivery pump 21 stops, the first check valve 22 can restrict the sealing liquid in the receiving cavity 4a from returning to the storage tank 1 via the delivery pump 21.

[0025] In order to maintain the liquid pressure in the receiving cavity 4a after the delivery pump 21 stops, in one embodiment, the delivery assembly 2 further includes an accumulator 23, which is disposed in the flow path between the first check valve 22 and the receiving cavity 4a. The accumulator 23 can be a bladder-type accumulator, a piston-type accumulator, or a diaphragm-type accumulator, etc.

[0026] In this embodiment, by setting up an accumulator 23, the accumulator 23 can inject pressurized sealing fluid into the flow path between the first check valve 22 and the receiving cavity 4a when the delivery pump 21 stops, which can maintain the pressure of the sealing fluid and ensure the sealing of the stirring shaft of the agitator.

[0027] It should be understood that the accumulator 23 can store energy through the pressure of the liquid pumped out by the delivery pump 21, or it can store energy through additional pressurized liquid.

[0028] It should be understood that the number of delivery pumps 21 can be one or more, where "more" includes two or more. Specifically, in one embodiment, the number of delivery pumps 21 in the delivery assembly 2 is multiple. The delivery assembly 2 also includes a delivery pipe 24, one end of which is connected to the liquid outlet of multiple delivery pumps 21, and the other end is connected to the receiving cavity 4a. The hydraulic control port 32a of the hydraulic control check valve 32 is connected to the liquid outlet of multiple delivery pumps 21. A first check valve 22 and a first shut-off valve 25 are provided on the flow path of the liquid outlet of each of the two delivery pumps 21. The first shut-off valve 25 is located on the side of the first check valve 22 away from the delivery pump 21. The connection between the hydraulic control port 32a of the hydraulic control check valve 32 and the liquid outlet of the delivery pump 21 is located between the first shut-off valve 25 and the first check valve 22.

[0029] By setting up multiple delivery pumps 21, one delivery pump 21 operates during operation, and when that delivery pump 21 fails, another delivery pump 21 is started, achieving the purpose of one in use and one in standby. By connecting the hydraulic control port 32a to the outlet of multiple delivery pumps 21, the pressure of the sealing fluid output by any delivery pump 21 can control the opening and closing of the hydraulic control check valve 32. By setting up a first shut-off valve 25, the first shut-off valve 25 controls the opening and closing of the output flow channel of the corresponding delivery pump 21. By connecting the hydraulic control port 32a of the hydraulic control check valve 32 to the outlet of two delivery pumps 21, when any delivery pump 21 is working, the pressure output by the delivery pump 21 can act on the hydraulic control check valve 32 through the hydraulic control port 32a, causing the hydraulic control check valve 32 to open.

[0030] When it is necessary to drain the sealing fluid in the receiving cavity 4a and the pipeline, in one embodiment, the delivery assembly 2 further includes a drain pipe 26 and a drain valve 27. One end of the drain pipe 26 is connected to the liquid outlet of each delivery pipe 24, and the other end of the drain pipe 26 is connected to the liquid storage tank 1. The drain valve 27 is provided on the drain pipe 26.

[0031] When it is necessary to drain the sealing fluid in the system, open the drain valve 27 so that the sealing fluid in the receiving cavity 4a and pipeline can be drained through the drain pipe 26, thus preventing the accumulation of sealing fluid between the delivery pump 21 and the receiving cavity 4a.

[0032] In order to filter the returned sealing fluid, in one embodiment, the return assembly 3 further includes a filter 33 disposed in the flow path of the return pipe 31.

[0033] It should be understood that the filter 33 can be a mesh filter 33 or a fiber cartridge filter 33.

[0034] In order to stabilize the drainage in the return pipe 31, in one embodiment, the return assembly 3 further includes a self-regulating pressure reducing valve 34, which is disposed in the return pipe 31 and between the heat exchanger and the hydraulic control check valve 32.

[0035] By setting a self-regulating pressure reducing valve 34, when the inlet pressure of the return pipe 31 suddenly increases, the self-regulating pressure reducing valve 34 will close slightly to prevent excessive sealing fluid from flowing out; when the inlet pressure of the return pipe 31 suddenly decreases, the self-regulating pressure reducing valve 34 will automatically open slightly to ensure that the liquid output is not too small and to stabilize the liquid discharge in the return pipe 31.

[0036] When the filter 33 is clogged, in order to prevent the sealing liquid from being unable to drain, in one embodiment, the reflux assembly 3 further includes a drain pipe 35 and a drain valve 36. One end of the drain pipe 35 is connected to the reflux pipe 31 and the other end is connected to the liquid storage tank 1. The drain valve 36 is disposed on the drain pipe 35.

[0037] When the filter 33 is clogged, in order to allow the sealing fluid in the drain pipe 35 to be discharged, the drain valve 36 is opened, and the sealing fluid in the return pipe 31 can directly enter the storage tank 1 through the drain pipe 35.

[0038] In order to reduce the temperature of the returned sealing fluid, in one embodiment, the return assembly 3 further includes a heat exchanger 37 having a heat exchange channel disposed on the flow path of the return pipe 31 and a cooling channel capable of exchanging heat with the heat exchange channel.

[0039] The heat exchanger 37 can be a plate heat exchanger, a shell and tube heat exchanger, etc. Cooling water is introduced into the cooling channel of the heat exchanger 37 to cool the sealing fluid.

[0040] It should be understood that the outlet end of the delivery pump 21 can be directly connected to the receiving cavity 4a, or it can be indirectly connected to the receiving cavity 4a through other components. Therefore, in one embodiment, the sealing fluid system of the pressure vessel agitator further includes a sealing component 5. The sealing component 5 includes an inlet pipe 51, an outlet pipe 52 and a second check valve 53. The receiving cavity 4a is connected to the delivery pipe 24 through the inlet pipe 51 and to the return pipe 31 through the outlet pipe 52. The second check valve 53 is provided on the outlet pipe 52 for unidirectional flow from the receiving cavity 4a to the return pipe 31.

[0041] In this embodiment, the sealing fluid pumped out by the delivery pump 21 enters the inlet pipe 51 and then enters the receiving cavity 4a through the inlet pipe 51. The sealing fluid in the receiving cavity 4a enters the return pipe 31 through the outlet pipe 52. By setting a second check valve 53 on the outlet pipe 52, the second check valve 53 can restrict the fluid in other pipes from flowing back through the receiving cavity 4a.

[0042] When maintenance is required on the receiving cavity 4a of a certain seal 4, in order to prevent the other seals 4 from stopping working, in one embodiment, the sealing assembly 5 further includes a second shut-off valve 54 and a third shut-off valve 56. The second shut-off valve 54 is disposed on the inlet pipe 51 and is used to control the opening and closing of the inlet pipe 51. The third shut-off valve 56 is disposed on the outlet pipe 52 and is used to control the opening and closing of the outlet pipe 52.

[0043] When it is necessary to inspect the cavity 4a of a certain seal 4 separately, the corresponding second shut-off valve 54 and third shut-off valve 56 are closed. Through the coordinated action of the second shut-off valve 54, the second check valve 53 and the third shut-off valve 56, the sealing fluid can be prevented from continuously entering the cavity 4a.

[0044] It should be understood that the pressurized vessel agitator sealing fluid system can provide sealing fluid to a single containment cavity 4a, or a pressurized vessel agitator sealing fluid system can provide sealing fluid to multiple containment cavities 4a. Specifically, in one embodiment, there are multiple sealing components 5. Among the multiple sealing components 5, multiple inlet pipes 51 are connected to the delivery pipe 24, and multiple outlet pipes 52 are connected to the return pipe 31.

[0045] In this embodiment, by setting multiple sealing components 5, a pressure vessel agitator sealing fluid system can provide sealing fluid to multiple receiving cavities 4a, and can seal multiple agitators through a single pressure vessel agitator sealing fluid system.

[0046] In order to determine the sealing condition of the seal 4 of each agitator, in one embodiment, the sealing assembly 5 further includes a first flow meter 55, which is disposed in the outlet pipe 52; the reflux assembly 3 further includes a second flow meter 38, which is disposed in the reflux pipe 31.

[0047] By setting a first flow meter 55 in the sealing assembly 5, the first flow meter 55 can record the fluid flow rate through the receiving cavity 4a of each seal 4. The flow rate of the fluid is compared with the normal flow rate value. If the deviation is too large, it indicates that the seal 4 of the corresponding agitator is faulty and needs to be repaired. Alternatively, the flow rates counted by different first flow meters 55 can be compared. If the deviation is too large, it indicates that the seal 4 of the corresponding agitator is faulty.

[0048] It should be understood that the seal 4 is a common and readily available component. The innovation of this application does not involve the specific structure of the seal 4. Therefore, this application will not discuss the seal 4 in detail.

[0049] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A sealing fluid system for a pressure vessel agitator, wherein the pressure vessel agitator is sealed by a sealing element, the sealing element having a receiving cavity into which the sealing fluid enters, characterized in that, The pressure vessel agitator sealing fluid system includes: reservoir; A delivery assembly includes a delivery pump, wherein the inlet end of the delivery pump is connected to the storage tank and the outlet end is connected to the receiving cavity; and The reflux assembly includes a reflux pipe and a hydraulically controlled check valve. One end of the reflux pipe is connected to the receiving cavity and the other end is connected to the liquid storage tank. The hydraulically controlled check valve is disposed on the flow path of the reflux pipe, and the hydraulic control port of the hydraulically controlled check valve is connected to the liquid outlet of the delivery pump. When the liquid outlet pressure of the delivery pump is less than a set value, the hydraulically controlled check valve closes the reflux pipe.

2. The pressure vessel agitator sealing fluid system according to claim 1, characterized in that, The conveying assembly further includes a first check valve, which is disposed on the flow path between the conveying pump and the receiving cavity, for unidirectional flow from the conveying pump to the receiving cavity.

3. The pressure vessel agitator sealing fluid system according to claim 2, characterized in that, The conveying assembly also includes an accumulator, which is disposed on the flow path between the first check valve and the receiving cavity.

4. The sealing fluid system for the pressure vessel agitator according to claim 2, characterized in that, The number of conveying pumps in the conveying assembly is multiple; The conveying assembly also includes a conveying pipe, one end of which is connected to the liquid outlet of the plurality of conveying pumps, and the other end is connected to the receiving cavity; The hydraulic control port of the hydraulic control check valve is connected to the outlet of each of the multiple delivery pumps.

5. The sealing fluid system for the pressure vessel agitator according to claim 1, characterized in that, The reflux assembly also includes a filter disposed in the flow path of the reflux pipe.

6. The sealing fluid system for the pressure vessel agitator according to claim 1, characterized in that, The reflux assembly further includes a heat exchanger having a heat exchange channel disposed on the flow path of the reflux pipe and a cooling channel capable of exchanging heat with the heat exchange channel.

7. The pressure vessel agitator sealing fluid system according to claim 4, characterized in that, It also includes a sealing assembly, which includes an inlet pipe, an outlet pipe and a second check valve. The receiving cavity is connected to the delivery pipe via the inlet pipe and to the return pipe via the outlet pipe. The second check valve is disposed on the outlet pipe for one-way flow from the receiving cavity to the return pipe.

8. The pressure vessel agitator sealing fluid system according to claim 7, characterized in that, The number of sealing components is multiple, and among the multiple sealing components, multiple inlet pipes are connected to the delivery pipe, and multiple outlet pipes are connected to the return pipe.

9. The sealing fluid system for the pressure vessel agitator according to claim 8, characterized in that, The sealing assembly also includes a first flow meter, which is disposed on the outlet pipe.

10. The sealing fluid system for the pressure vessel agitator according to claim 8, characterized in that, The reflux assembly also includes a second flow meter, which is disposed in the reflux pipe.

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