Mechanical seal pressure maintaining and heat dissipating device and pump set

Abstract

The utility model discloses a mechanical seal pressure maintaining heat dissipation device and a pump set. The mechanical seal pressure maintaining device comprises a cooling mechanism, a heat exchange mechanism and a pressure maintaining mechanism which are sequentially connected end to end. The cooling mechanism comprises at least two medium channels connected in parallel, and each medium channel comprises an input pipe and an output pipe; the input pipe is connected with the pressure maintaining mechanism and the mechanical seal, the output pipe is connected with the mechanical seal and the heat exchange mechanism, an input valve is arranged on the input pipe, and an output valve is arranged on the output pipe; the pressure maintaining mechanism comprises a pressure buffer tank and a pressurizing assembly connected with the pressure buffer tank; the input end of the heat exchange mechanism is connected with the output pipe, and the output end of the heat exchange mechanism is connected with the input end of the pressure buffer tank. By means of the mechanical seal pressure maintaining and heat dissipating device, the pressure maintaining and heat dissipating functions of a pump set comprising two or more efflux pumps can be optimized, the input valve and the output valve on each medium channel provide convenience for providing the pressure maintaining and heat dissipating functions, overhauling and maintaining and the like, and meanwhile the maintaining time and the material resource cost are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of pressure maintaining and heat dissipation, and particularly relates to a mechanical seal pressure maintaining and heat dissipation device and pump set. BACKGROUND

[0002] The offshore oil production platform export pump is composed of three centrifugal pumps, one in use and two in standby or two in use and one in standby, the export pump pressurizes the crude oil produced by the platform and transports the crude oil to the downstream through a pipeline, the mechanical seal can prevent the crude oil leakage of the shaft seal surface of the pump during the operation process, and energy waste and environmental pollution are avoided. The main type of the mechanical seal used by the export pump is a balanced mechanical seal, which can reduce the friction and wear on the sealing end face. In order to prevent the leakage caused by the deformation failure of the sealing surface due to overheating and prolong the service life of the mechanical seal, it is necessary to ensure that the mechanical seal can be well cooled during the pump operation. SUMMARY

[0003] The utility model solves the technical problem in providing a mechanical seal pressure maintaining and heat dissipation device and pump set.

[0004] The utility model adopts the technical scheme in the technical problems thereof: a kind of mechanical seal pressure maintaining and heat dissipation device is structured, including cooling mechanism, heat exchange mechanism and pressure maintaining mechanism connected in order head to tail;

[0005] The cooling mechanism includes at least two parallel medium channels, each medium channel includes an input pipe and an output pipe;The input pipe is connected to the pressure maintaining mechanism and the mechanical seal, and the output pipe is connected to the mechanical seal and the heat exchange mechanism, and an input valve is provided on the input pipe, and an output valve is provided on the output pipe;

[0006] The pressure maintaining mechanism includes a pressure buffer tank and a pressurizing assembly connected to the pressure buffer tank;

[0007] The input end of the heat exchange mechanism is connected to the output pipe, and the output end of the heat exchange mechanism is connected to the input end of the pressure buffer tank.

[0008] Preferably, in the mechanical seal pressure maintaining and heat dissipation device structured by the utility model, the cooling mechanism includes a first medium channel, a second medium channel and a third medium channel in parallel;

[0009] The first medium channel includes a first input pipe and a first output pipe;The first input pipe is connected to the pressure maintaining mechanism and the first mechanical seal of the first export pump, and the first output pipe is connected to the first mechanical seal of the first export pump;A first input valve is provided on the first input pipe, and a first output valve is provided on the first output pipe;

[0010] The second medium channel comprises a second input pipe and a second output pipe; the second input pipe is connected to the pressure maintaining mechanism and a second mechanical seal of the second delivery pump, and the second output pipe is connected to a second mechanical seal of the second delivery pump; a second input valve is arranged on the second input pipe, and a second output valve is arranged on the second output pipe.

[0011] The third medium channel comprises a third input pipe and a third output pipe; the third input pipe is connected to the pressure maintaining mechanism and a third mechanical seal of the third delivery pump, and the third output pipe is connected to a third mechanical seal of the third delivery pump; a third input valve is arranged on the third input pipe, and a third output valve is arranged on the third output pipe.

[0012] Preferably, in the mechanical seal pressure maintaining and heat dissipating device, the pressure maintaining mechanism further comprises a pressure transmitter connected to the pressure buffer tank, a pneumatic pressure pump connected to the pressure buffer tank, a second cooling medium storage tank connected to the pneumatic pressure pump, and a solenoid valve connected between the air source and the pneumatic pressure pump; a signal input end of the solenoid valve is connected to a signal output end of the pressure transmitter.

[0013] Preferably, in the mechanical seal pressure maintaining and heat dissipating device, the pressure maintaining mechanism further comprises a pressure gauge connected to the pressure buffer tank.

[0014] Preferably, in the mechanical seal pressure maintaining and heat dissipating device, the pressure maintaining mechanism further comprises a pressure switch connected to the pressure buffer tank.

[0015] Preferably, in the mechanical seal pressure maintaining and heat dissipating device, the pressure maintaining mechanism further comprises a pressure switch connected to the pressure buffer tank.

[0016] Preferably, in the mechanical seal pressure maintaining and heat dissipating device, the pressure maintaining mechanism further comprises a pressure switch connected to the pressure buffer tank.

[0017] A signal input end of the solenoid valve is connected to the communication mechanism, and the communication mechanism is in communication connection with an external terminal.

[0018] Preferably, in the mechanical seal pressure maintaining and heat dissipating device, the pressure maintaining mechanism further comprises a pressure switch connected to the pressure buffer tank.

[0019] A signal input end of the solenoid valve is connected to the communication mechanism, and the communication mechanism is in communication connection with an external terminal.

[0020] Preferably, in the mechanical seal pressure maintaining and heat dissipating device, the pressure maintaining mechanism further comprises a pressure switch connected to the pressure buffer tank.

[0021] Alternatively, the medium passage is a 3 / 4 inch line;

[0022] Alternatively, the input valve and the output valve are both connected to a valve control assembly.

[0023] Alternatively, the input valve and the output valve on each medium passage are interlocked.

[0024] The utility model further constructs a kind of pump group, and the pump group includes the mechanical seal pressure maintaining heat radiation device in any one of above.

[0025] By implementing the utility model, the following beneficial effects are achieved:

[0026] The utility model discloses a kind of mechanical seal pressure maintaining heat radiation device and pump group, and the mechanical seal pressure maintaining device includes cooling mechanism, heat exchange mechanism and pressure maintaining mechanism connected in order head to tail;Cooling mechanism includes at least two parallel medium passages, each medium passage includes input pipe and output pipe;Input pipe is connected pressure maintaining mechanism and mechanical seal, output pipe is connected mechanical seal and heat exchange mechanism, input valve is equipped on input pipe, output valve is equipped on output pipe;Pressure maintaining mechanism includes pressure buffer tank and the pressurizing assembly of connecting pressure buffer tank;The input end of heat exchange mechanism is connected output pipe, and the output end of heat exchange mechanism is connected the input end of pressure buffer tank.By the mechanical seal pressure maintaining heat radiation device, the pressure maintaining heat radiation function of the pump group of two and above external transport pumps can be optimized, and input valve and output valve on each medium passage provide the convenience for providing pressure maintaining heat radiation function and overhaul maintenance etc. BRIEF DESCRIPTION OF DRAWINGS

[0027] The utility model will be further described below in connection with the drawings and examples, and in the drawings:

[0028] Figure 1 It is the first structure schematic view of mechanical seal pressure maintaining heat radiation device disclosed by the utility model;

[0029] Figure 2 It is the second structure schematic view of mechanical seal pressure maintaining heat radiation device disclosed by the utility model. DETAILED DESCRIPTION

[0030] In order to have a clearer understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like are based on the directions or positional relationships shown in the drawings, constructed and operated in a particular direction, and are only for the convenience of describing the present technical solution, and do not indicate that the indicated device or element must have a particular direction, therefore, it cannot be understood as a limitation on the present application.

[0031] It should be further pointed out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing", "setting" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as "on" or "below" another element, the element can be "directly" or "indirectly" above the other element, or there can be one or more intermediate elements. The terms "first", "second", "third" and the like are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features, therefore, the features with "first", "second", "third" and the like can be explicitly or implicitly included one or more of the features. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the following description, specific details are presented such as specific system structures, techniques, etc. in order to thoroughly understand the embodiments of the present application, but those skilled in the art should understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed description of well-known systems, devices, circuits and methods is omitted to avoid unnecessary details that hinder the description of the present application.

[0033] Referring to Figure 1 and Figure 2The utility model discloses a first embodiment discloses a mechanical seal pressure maintaining heat abstractor, including cooling mechanism 1, heat exchange mechanism 2 and pressure maintaining mechanism 3 of head -to -tail connection in proper order, cooling mechanism 1 includes at least two parallel medium passageways, and each medium passageway includes input pipe 11 and output pipe 12, input pipe 11 is connected pressure maintaining mechanism 3 and mechanical seal, and output pipe 12 is connected mechanical seal and heat exchange mechanism 2, be equipped with input valve 13 on input pipe 11, be equipped with output valve 14 on output pipe 12, pressure maintaining mechanism 3 includes pressure buffer tank 31 and the pressurizing assembly 32 of connecting pressure buffer tank 31, the input end of heat exchange mechanism 2 is connected output pipe 12, and the output end of heat exchange mechanism 2 is connected the input end of pressure buffer tank 31.

[0034] Wherein, the function of cooling mechanism 1 is to absorb the heat emitted by the target mechanical seal outside through the heat exchange medium flowing inside, to achieve the purpose of cooling the mechanical seal. The function of heat exchange mechanism 2 is to receive the heat exchange medium from cooling mechanism 1, and make the heat exchange medium exchange heat with the external medium (water, air or other medium), to reduce the temperature of the heat exchange medium passing through heat exchange mechanism 2, so that the heat exchange medium in the mechanical seal pressure maintaining heat abstractor can work cyclically. The function of pressure maintaining mechanism 3 is to maintain the overall pressure level in the mechanical seal pressure maintaining heat abstractor, to avoid the problems of leakage or overheating of the mechanical seal caused by pressure loss. When the pressure in the mechanical seal pressure maintaining heat abstractor is lost, the pressure in the mechanical seal pressure maintaining heat abstractor can be maintained at a target level by the pressurizing assembly 32.

[0035] And, cooling mechanism 1, heat exchange mechanism 2 and pressure maintaining mechanism 3 are connected by pipelines to form a closed circulation system. In such a system, pressure buffer tank 31 can adjust the thermal expansion and contraction of the medium itself caused by temperature changes, providing a buffer space for the system, allowing the cooling liquid to expand or contract freely, thereby adjusting the system pressure in the mechanical seal pressure maintaining heat abstractor, preventing it from being too high or too low, and ensuring the safe operation of the circulation system. In addition, pressure buffer tank 31 can also remove air that has entered the circulation system by mistake and bubbles generated during the circulation process, preventing gas from forming air resistance in the circulation system and maintaining the heat exchange effect of the medium during circulation.

[0036] By connecting multiple medium passageways in parallel, the problem of high cost investment for frequent maintenance of mechanical seal pressure maintaining heat abstractor equipment for each external pump is solved. In the prior art, each external pump is equipped with mechanical seal pressure maintaining heat abstractor equipment, and the number of equipment accessories is large, so the maintenance and replacement cost is high. The present embodiment improves the mechanical seal pressure maintaining device of multiple external pumps to one set, reducing the number of equipment, improving the reliability of the equipment, and reducing the equipment failure rate and maintenance cost.

[0037] Further, in offshore oil platforms, the most common configuration is a pump group consisting of three centrifugal pumps. Therefore, in the mechanical seal pressure maintaining and heat dissipating device disclosed in the present embodiment, the cooling mechanism 1 comprises a first medium channel, a second medium channel and a third medium channel in parallel. The first medium channel comprises a first input pipe 11 and a first output pipe 12; the first input pipe 11 is connected to the first mechanical seal of the first export pump and the pressure maintaining mechanism 3, and the first output pipe 12 is connected to the first mechanical seal of the first export pump; the first input pipe 11 is provided with a first input valve 13, and the first output pipe 12 is provided with a first output valve 14. The second medium channel comprises a second input pipe 11 and a second output pipe 12; the second input pipe 11 is connected to the second mechanical seal of the second export pump and the pressure maintaining mechanism 3, and the second output pipe 12 is connected to the second mechanical seal of the second export pump; the second input pipe 11 is provided with a second input valve 13, and the second output pipe 12 is provided with a second output valve 14. The third medium channel comprises a third input pipe 11 and a third output pipe 12; the third input pipe 11 is connected to the third mechanical seal of the third export pump and the pressure maintaining mechanism 3, and the third output pipe 12 is connected to the third mechanical seal of the third export pump; the third input pipe 11 is provided with a third input valve 13, and the third output pipe 12 is provided with a third output valve 14.

[0038] In a preferred embodiment, the start-stop state of the first export pump is associated with the on-off state of the first input valve 13 and the first output valve 14, the start-stop state of the second export pump is associated with the on-off state of the second input valve 13 and the second output valve 14, and the start-stop state of the third export pump is associated with the on-off state of the third input valve 13 and the third output valve 14. The start-stop state of a single export pump is used to automatically open and close the corresponding input valve 13 and output valve 14, i.e., when a single export pump is started, the corresponding medium channel is turned on, and when a single export pump is stopped, the corresponding medium channel is turned off. The maintenance and replacement of the damaged export pump mechanical seal is a large workload, and the cost of spare parts is high. Therefore, by switching the valves, the device can meet the conditions of working with any one export pump, any two export pumps and three export pumps, and also meet the conditions of repairing a single export pump.

[0039] Further, due to the inevitable wear and slight leakage of the mechanical seal, the diesel level and the pressure in the pressure buffer tank 31 will change, resulting in the need for regular pressure compensation in the pressure buffer tank 31. In the mechanical seal pressure maintaining and heat dissipating device disclosed in the embodiment, the pressure increasing assembly 32 includes a pressure increasing pump and a first cooling medium storage tank 326 connected to the pressure increasing pump. The cooling medium storage tank stores the medium circulating in the mechanical seal pressure maintaining and heat dissipating device. The pressure increasing pump includes a manual pressure increasing pump 325 and a manual ball valve connected between the manual pressure increasing pump 325 and an air source. By connecting the pressure increasing pump to the first cooling medium storage tank 326, the pressure in the pressure buffer tank 31 can be manually increased to the target value when the pressure in the pressure buffer tank 31 is insufficient, so as to avoid device failure due to insufficient pressure.

[0040] When the leakage of the mechanical seal increases, the frequency of manual pressure compensation will obviously increase, significantly increasing the workload of the on-site operator. If the manual pressure compensation is not timely, the mechanical seal of the export pump may be damaged due to overheating, resulting in leakage of crude oil and even an overheating fire.

[0041] Therefore, further, in the mechanical seal pressure maintaining and heat dissipating device disclosed in the embodiment, the pressure maintaining mechanism 3 further includes a pressure transmitter 321 connected to the pressure buffer tank 31, a pneumatic pressure increasing pump 322 connected to the pressure buffer tank 31, a second cooling medium storage tank 323 connected to the pneumatic pressure increasing pump 322, and a solenoid valve 324 connected between the air source and the pneumatic pressure increasing pump 322; the signal input end of the solenoid valve 324 is connected to the signal output end of the pressure transmitter 321. The pneumatic pressure increasing pump 322 is controlled by the air source, and the solenoid valve 324 connected to the air source pipeline of the pneumatic pressure increasing pump 322 can be externally connected to a 24-volt power supply to obtain power supply. The opening and closing of the solenoid valve 324 controls the connection and disconnection between the air source and the pneumatic pressure increasing pump 322. The signal input end of the solenoid valve 324 is connected to the signal output end of the pressure transmitter 321, so that the on-off of the solenoid valve 324 can be controlled by the pressure measurement value of the pressure buffer tank 31 detected by the pressure transmitter 321, and the on-off of the air source and the pneumatic pressure increasing pump 322 is further controlled.

[0042] The pressure transmitter 321 is connected to the pressure buffer tank 31 and is used to measure the pressure in the pressure buffer tank 31 to obtain a pressure measurement value. A preferred embodiment is that when the pressure measurement value is lower than 250 Kpa, the electromagnetic valve 324 is energized to act, the pneumatic pressure pump 322 is connected to the gas source and starts to work, and the medium in the second cooling medium storage tank 323 is used to supplement the pressure of the pressure buffer tank 31. When the pressure measurement value is higher than 400 Kpa, the electromagnetic valve 324 is de-energized to shut off, and the pneumatic pressure pump 322 is disconnected from the gas source and stops working. Through the pressure transmitter 321, the electromagnetic valve 324, the pneumatic pressure pump 322, and the second cooling medium storage tank 323, the automatic pressure compensation function of the mechanical seal pressure maintaining and heat dissipating device is constructed, so that the heat dissipation efficiency of each mechanical seal can be improved.

[0043] The embodiment uses the pressure transmitter 321 to control the electromagnetic valve 324 to realize the automatic pressure compensation function, and can realize the real-time monitoring of the pressure of the pressure buffer tank 31 by the central control and the remote manual pressure boosting function, without the need for personnel to regularly conduct on-site inspection and manually compensate the pressure, thereby reducing the workload, improving the reliability of the equipment operation, eliminating the risk of mechanical seal pressure loss due to personnel not timely compensating the pressure, and solving the problem of manually starting the pump to boost the pressure on site.

[0044] Furthermore, in order to avoid the problem of pressure drop in the pressure buffer tank 31 during the use of multiple mechanical seals of the export pump, the automatic start-stop function of the pneumatic pump or the remote manual start-stop function of the central control is used to improve the pressure maintaining capability of the mechanical seal of the export pump, reduce the risk of crude oil leakage and environmental pollution caused by pressure drop of the mechanical seal, and solve the problem of continuous pressure maintaining of the mechanical seal of the export pump.

[0045] Further, in the mechanical seal pressure maintaining and heat dissipating device disclosed in the embodiment, the pressure maintaining mechanism 3 further comprises a pressure gauge 33 connected to the pressure buffer tank 31. The pressure level value in the pressure buffer tank 31 is displayed in real time by the pressure gauge 33, so that the on-site patrol personnel can intuitively and effectively monitor the working state of the mechanical seal pressure maintaining and heat dissipating device. A preferred embodiment is that the pressure gauge 33 is in communication connection with the central control, and personnel can obtain the pressure information of the pressure buffer tank 31 in real time through the central control.

[0046] Further, in the mechanical seal pressure maintaining and heat dissipating device disclosed in the embodiment, the pressure maintaining mechanism 3 further comprises a pressure switch 34 connected to the pressure buffer tank 31. A preferred embodiment is that the pressure switch 34 is in communication connection with the central control, and the set point of the pressure switch 34 is 200 Kpa. When the pressure switch 34 detects that the pressure of the pressure buffer tank 31 is lower than 200 Kpa, the central control screen pops up an alarm.

[0047] Further, the above-mentioned component can be connected in communication with the central control, further enabling remote manual start-stop of the pneumatic pressurizing pump 322 by the central control, so that manpower can control the pressure compensation function of the mechanical seal pressure maintaining and heat dissipating device. Moreover, through program configuration, the opening and closing of the air source and the electromagnetic valve 324 are realized, and thus the automatic start-stop of the pneumatic pressurizing pump 322 is realized.

[0048] Further, the mechanical seal pressure maintaining and heat dissipating device disclosed in the embodiment further comprises a communication mechanism; the signal input end of the electromagnetic valve 324 is connected to the communication mechanism, and the communication mechanism is connected in communication with an external terminal. In addition to the central control, in order to adapt to various use scenarios, the opening and closing of the electromagnetic valve 324 are controlled in real time by a mobile terminal or the like, the signal input end of the electromagnetic valve 324 can be connected to a Bluetooth signal or other wireless communication signal, so as to enhance the flexibility of the device.

[0049] Further, the mechanical seal pressure maintaining and heat dissipating device disclosed in the embodiment further comprises an alarm mechanism; the signal input end of the pressure switch 34 is connected to the pressure buffer tank 31, and the signal output end of the pressure switch 34 is connected to the alarm mechanism. In addition to the alarm interface displayed on the central control, the pressure switch 34 is connected to a field alarm device, which is beneficial to field inspection and makes it easier to find the device in case of an alarm.

[0050] Further, in the mechanical seal pressure maintaining and heat dissipating device disclosed in the embodiment, the cooling medium in the medium channel is diesel oil. As the cooling medium, diesel oil has a high heat value and good fluidity, and can maintain good performance under various environmental conditions, has good chemical stability and is not easy to decompose at high temperatures. Diesel oil is a relatively low-cost cooling medium, and can fully demonstrate its characteristics of high efficiency, stability, economy and safety, especially in large-scale industrial applications such as crude oil collection.

[0051] Further, in the mechanical seal pressure maintaining and heat dissipating device disclosed in the embodiment, the medium channel is a 3 / 4 inch pipeline. In the existing heat dissipation structure of the mechanical seal of most export pumps, the 3 / 4 inch pipeline can be directly used for the modification of the mechanical seal pressure maintaining and heat dissipating device disclosed in the embodiment, which is more environmentally friendly.

[0052] Further, in the mechanical seal pressure maintaining and heat dissipating device disclosed in the embodiment, the input valve 13 and the output valve 14 are both connected to a valve control assembly. In a one-to-many backup and many-to-one backup working condition, the input valve 13 and the output valve 14 of the medium channel connected to the standby pump and the working pump can be controlled in batches through the valve control assembly. Preferably, the valve control assembly is linked between the input valve 13 and the output valve 14 in the same medium channel.

[0053] Further, the input valve 13 and the output valve 14 on each medium channel are interlocked in the mechanical seal pressure-maintaining and heat-dissipating device disclosed in the embodiment.

[0054] Further, the mechanical seal pressure-maintaining and heat-dissipating device disclosed in the embodiment can be obtained by modifying the existing mechanical seal heat-dissipating device of a pump set.

[0055] The second embodiment of the utility model discloses a pump set, and the pump set comprises the mechanical seal pressure-maintaining and heat-dissipating device in any one of the above.

[0056] Further, the pump set in the embodiment comprises three external delivery pumps, which are a first external delivery pump, a second external delivery pump and a third external delivery pump.

[0057] The heat exchange medium in the mechanical seal pressure-maintaining and heat-dissipating device obtains flow power from the rotating part in the mechanical seal structure and returns to the mechanical seal structure after sequentially passing through the output pipe, the radiator, the cooling medium storage tank and the input pipe.

[0058] By implementing the utility model, the following beneficial effects are achieved:

[0059] The utility model discloses a kind of mechanical seal pressure maintaining heat dissipation device and pump group, the mechanical seal pressure maintaining device includes cooling mechanism, heat exchange mechanism and pressure maintaining mechanism connected in order head to tail;Cooling mechanism includes at least two parallel medium passages, each medium passage includes input pipe and output pipe;Input pipe connects pressure maintaining mechanism and mechanical seal, output pipe connects mechanical seal and heat exchange mechanism, input valve is equipped on input pipe, output valve is equipped on output pipe;Pressure maintaining mechanism includes pressure buffer tank and the pressurizing assembly of connecting pressure buffer tank;The input end of heat exchange mechanism connects output pipe, the output end of heat exchange mechanism connects the input end of pressure buffer tank.By the mechanical seal pressure maintaining heat dissipation device, the pressure maintaining heat dissipation function of the pump group of two and more than external delivery pump can be optimized, the input valve and output valve on each medium passage provide the convenience for providing pressure maintaining heat dissipation function and overhaul maintenance etc.

[0060] It can be understood that the above embodiments only express the preferred embodiments of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope;It should be pointed out that for ordinary skilled person in the art, on the premise of not departing from the utility model concept, the above-mentioned embodiments or technical features can be freely combined, and a plurality of variations and improvements can be made, which belong to the protection scope of the utility model, i.e. the embodiments described in "in some embodiments" can be freely combined with any of the above and below embodiments;Therefore, any equivalent transformation and modification made in the utility model claim range should belong to the coverage of the utility model claim.

Claims

1. A mechanical seal pressure-maintaining and heat dissipation device, characterized in that, It includes a cooling mechanism (1), a heat exchange mechanism (2), and a pressure holding mechanism (3) connected in sequence from end to end; The cooling mechanism (1) includes at least two parallel medium channels, each medium channel including an inlet pipe (11) and an outlet pipe (12); the inlet pipe (11) is connected to the pressure holding mechanism (3) and the mechanical seal, the outlet pipe (12) is connected to the mechanical seal and the heat exchange mechanism (2), the inlet pipe (11) is provided with an inlet valve (13), and the outlet pipe (12) is provided with an outlet valve (14); The pressure holding mechanism (3) includes a pressure buffer tank (31) and a pressurizing assembly (32) connected to the pressure buffer tank (31); The input end of the heat exchange mechanism (2) is connected to the output pipe (12), and the output end of the heat exchange mechanism (2) is connected to the input end of the pressure buffer tank (31).

2. The mechanical seal pressure-maintaining and heat dissipation device according to claim 1, characterized in that, The cooling mechanism (1) includes a first medium channel, a second medium channel, and a third medium channel connected in parallel; The first medium channel includes a first input pipe (11) and a first output pipe (12); the first input pipe (11) is connected to the pressure holding mechanism (3) and the first mechanical seal of the first external pump, and the first output pipe (12) is connected to the first mechanical seal of the first external pump; a first input valve (13) is provided on the first input pipe (11), and a first output valve (14) is provided on the first output pipe (12); The second medium channel includes a second input pipe (11) and a second output pipe (12); the second input pipe (11) is connected to the pressure holding mechanism (3) and the second mechanical seal of the second external pump, and the second output pipe (12) is connected to the second mechanical seal of the second external pump; a second input valve (13) is provided on the second input pipe (11), and a second output valve (14) is provided on the second output pipe (12); The third medium channel includes a third input pipe (11) and a third output pipe (12); the third input pipe (11) is connected to the pressure holding mechanism (3) and the third mechanical seal of the third external pump, and the third output pipe (12) is connected to the third mechanical seal of the third external pump; a third input valve (13) is provided on the third input pipe (11), and a third output valve (14) is provided on the third output pipe (12).

3. The mechanical seal pressure-maintaining and heat dissipation device according to claim 1, characterized in that, The pressurization assembly (32) includes a pressurization pump and a first cooling medium storage tank connected to the pressurization pump.

4. The mechanical seal pressure-maintaining and heat dissipation device according to claim 1, characterized in that, The pressure holding mechanism (3) further includes a pressure transmitter (321) connected to the pressure buffer tank (31), a pneumatic booster pump (322) connected to the pressure buffer tank (31), a second cooling medium storage tank (323) connected to the pneumatic booster pump (322), and a solenoid valve (324) connected between the air source and the pneumatic booster pump (322); the signal input terminal of the solenoid valve (324) is connected to the signal output terminal of the pressure transmitter (321).

5. The mechanical seal pressure-maintaining and heat dissipation device according to claim 3 or 4, characterized in that, The pressure holding mechanism (3) also includes a pressure gauge (33) connected to the pressure buffer tank (31).

6. The mechanical seal pressure-maintaining and heat dissipation device according to claim 3 or 4, characterized in that, The pressure holding mechanism (3) also includes a pressure switch (34) connected to the pressure buffer tank (31).

7. The mechanical seal pressure-maintaining and heat dissipation device according to claim 4, characterized in that, It also includes communication agencies; The signal input terminal of the solenoid valve (324) is connected to the communication mechanism, and the communication mechanism is connected to an external terminal.

8. The mechanical seal pressure-maintaining and heat dissipation device according to claim 6, characterized in that, It also includes alarm systems; The signal input terminal of the pressure switch (34) is connected to the pressure buffer tank (31), and the signal output terminal of the pressure switch (34) is connected to the alarm mechanism.

9. The mechanical seal pressure-maintaining and heat dissipation device according to claim 1, characterized in that, The cooling medium in the medium channel is diesel fuel; Alternatively, the medium channel is a 3 / 4-inch conduit; Alternatively, both the input valve (13) and the output valve (14) are connected to a valve control assembly; Alternatively, the input valve (13) and the output valve (14) on each of the media channels may be linked together.

10. A pump set, characterized in that, Includes the mechanical seal pressure-maintaining and heat dissipation device as described in any one of claims 1 to 9.

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