Flushing pipeline for pump mechanical seal

Abstract

The utility model discloses a flushing pipeline for a pump mechanical seal, which comprises a flushing pipeline A and a flushing pipeline B which are arranged in parallel, flushing fluid flows into the liquid inlet end of the flushing pipeline A and the liquid inlet end of the flushing pipeline B, and the liquid outlet end of the flushing pipeline A and the liquid outlet end of the flushing pipeline B are communicated with a flushing channel on a pump; and a filter A is mounted on the flushing pipeline A, and a filter B is mounted on the flushing pipeline B. The mechanical sealing device has the advantages that the structure is simple, the mechanical sealing effect is ensured, the service life is prolonged, and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, and specifically relates to a flushing pipeline for a pump mechanical seal. Background Art

[0002] At present, shaft seals are used on pumps with mechanical seals. When the pump is running, a flushing pipeline device is required to flush the mechanical seal. Usually, the medium contains impurities, and the impurities enter the mechanical seal cavity through the flushing pipeline, causing wear of the sealing end face of the mechanical seal, affecting the sealing effect. At the same time, the impurities accumulate in the pipeline, causing the pipeline to be blocked and also affecting the flushing effect, resulting in dry grinding of the mechanical seal sealing surface and high heat, reducing the service life of the mechanical seal. Content of the Utility Model

[0003] The purpose of the utility model is to solve the deficiencies of the above-mentioned prior art, and provide a flushing pipeline for a pump mechanical seal with a simple structure, which can ensure the sealing effect and service life of the mechanical seal.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A flushing pipeline for a pump mechanical seal, characterized in that: it includes a flushing pipeline A and a flushing pipeline B arranged in parallel. The liquid inlet ends of the flushing pipeline A and the flushing pipeline B flow in flushing liquid, and the liquid outlet ends of the flushing pipeline A and the flushing pipeline B are connected to the flushing channel on the pump;

[0006] A filter A is installed on the flushing pipeline A, and a filter B is installed on the flushing pipeline B;

[0007] The setting of the filter can effectively filter impurities and avoid wear of the mechanical seal. The flushing pipelines are arranged in parallel. When the filter on one of the flushing pipelines is blocked by accumulated impurities, flushing can be carried out through the other flushing pipeline, effectively preventing dry grinding of the mechanical seal sealing surface and reducing the temperature of the mechanical seal, and ensuring the service life of the mechanical seal.

[0008] On the flushing pipeline A of the utility model, a control valve A1 is installed on the front side of the filter A, and a control valve A2 is installed on the rear side;

[0009] On the flushing pipeline B of the utility model, a control valve B1 is installed on the front side of the filter B, and a control valve B2 is installed on the rear side; when the filter is blocked, the control valves on both sides are closed, which is convenient for cleaning and maintenance of the filter.

[0010] On the flushing pipeline A of the utility model, a pressure sensor A1 is installed on the front side of the filter A, and a pressure sensor A2 is installed on the rear side;

[0011] A pressure sensor B1 is installed on the front side of the filter B on the flushing pipeline B, and a pressure sensor B2 is installed on the rear side.

[0012] By installing pressure sensors on both sides of the filter, when the pressure difference between the two pressure sensors is large, it is determined that the filter is blocked. This flushing pipeline can be closed in time, and flushing can be carried out through another flushing pipeline, ensuring that the flushing effect of the mechanical seal is not affected, and effectively avoiding the problem of single-channel flushing blockage during pump operation, which requires shutdown for maintenance.

[0013] The flushing pipeline A of the present utility model includes a liquid inlet pipe A1, a three-way A, a left liquid inlet pipe A2, and a right liquid inlet pipe A2. The three-way A includes an inlet A1, a left outlet A1, and a right outlet A1. The inlet A1 of the three-way A is communicated with the liquid outlet end of the liquid inlet pipe A1. The left outlet A1 is communicated with the liquid inlet end of the left liquid inlet pipe A2, and the right outlet A1 is communicated with the liquid inlet end of the right liquid inlet pipe A2. A filter A is installed on the liquid inlet pipe A1.

[0014] The flushing pipeline B includes a liquid inlet pipe B1, a three-way B, a left liquid inlet pipe B2, and a right liquid inlet pipe B2. The three-way B includes an inlet B1, a left outlet B1, and a right outlet B1. The inlet B1 of the three-way B is communicated with the liquid outlet end of the liquid inlet pipe B1. The left outlet B1 is communicated with the liquid inlet end of the left liquid inlet pipe B2, and the right outlet B1 is communicated with the liquid inlet end of the right liquid inlet pipe B2. A filter B is installed on the liquid inlet pipe B1.

[0015] The structural setting of the flushing pipeline can realize the flushing of the mechanical seals on both sides of the pump at the same time, with a simple structure and convenient flushing.

[0016] The present utility model further includes a left three-way, a right three-way, a left liquid outlet pipe, and a right liquid outlet pipe. The left three-way includes an inlet A2, an inlet B2, and a lower left outlet. The inlet A2 of the left three-way is communicated with the liquid outlet end of the left liquid inlet pipe A2. The inlet B2 is communicated with the liquid outlet end of the left liquid inlet pipe B2, and the lower left outlet is communicated with the liquid inlet end of the left liquid outlet pipe. The liquid outlet end of the left liquid outlet pipe is communicated with the left flushing channel on the pump.

[0017] The right three-way includes an inlet A3, an inlet B3, and a lower right outlet. The inlet A3 of the right three-way is communicated with the liquid outlet end of the right liquid inlet pipe A2. The inlet B3 is communicated with the liquid outlet end of the right liquid inlet pipe B2, and the lower right outlet is communicated with the liquid inlet end of the right liquid outlet pipe. The liquid outlet end of the right liquid outlet pipe is communicated with the right flushing channel on the pump.

[0018] The connection of the parallel flushing pipeline A and flushing pipeline B is realized, and the pipeline connection structure is simple.

[0019] The left liquid inlet pipe A2, right liquid inlet pipe A2, left liquid inlet pipe B2, and right liquid inlet pipe B2 of the present utility model are arranged in an L shape; so that the liquid outlet ends of the left liquid inlet pipe A2 and the left liquid inlet pipe B2 are close to each other and are connected through a tee, and the liquid outlet ends of the right liquid inlet pipe A2 and the right liquid inlet pipe B2 are close to each other and are connected through a tee, with a simple structure and convenient installation.

[0020] The liquid inlet ends of the flushing pipeline A and the flushing pipeline B of the present utility model are provided with a four-way joint. The four-way joint includes an inlet, an outlet A, an outlet B, and an exhaust port. The inlet of the four-way joint is connected to the flushing liquid inlet pipe, the outlet A is connected to the liquid inlet end of the liquid inlet pipe A1, and the outlet B is connected to the liquid inlet end of the liquid inlet pipe B1;

[0021] To achieve the connection of the liquid inlets of the flushing pipeline A and the flushing pipeline B.

[0022] The flushing liquid inlet pipe of the present utility model extends into the pump; the mechanical seal is flushed by the liquid in the pump, without the need for an external flushing liquid, with a simple structure and low cost.

[0023] A flushing pipeline for a pump mechanical seal, characterized in that: a filter is installed on the flushing pipeline, a control valve 1 and a pressure sensor 1 are installed at the liquid inlet end of the filter on the flushing pipeline, and a control valve 2 and a pressure sensor 2 are installed at the liquid outlet end of the filter.

[0024] The setting of the filter can effectively filter impurities and avoid mechanical seal wear. By installing pressure sensors on both sides of the filter, when the pressure difference between the two pressure sensors is large, it is determined that the filter is blocked, and this flushing pipeline can be closed in time for maintenance and cleaning.

[0025] The flushing pipeline of the present utility model includes a liquid inlet pipe 1, a left liquid inlet pipe 2, a right liquid inlet pipe 2, and a tee. The tee includes an inlet, a left outlet, and a right outlet. The inlet of the tee is connected to the liquid outlet end of the liquid inlet pipe 1, the left outlet is connected to the liquid inlet end of the left liquid inlet pipe 2, and the right outlet is connected to the liquid inlet end of the right liquid inlet pipe 2. A filter is installed on the liquid inlet pipe 1, and the liquid inlet end of the liquid inlet pipe 1 extends into the pump;

[0026] The structural setting of the flushing pipeline can achieve the flushing of the mechanical seals on both sides of the pump at the same time, with a simple structure and convenient flushing. The mechanical seal is flushed by the liquid in the pump, without the need for an external flushing liquid, with a simple structure and low cost.

[0027] The beneficial effects of the present utility model are: the setting of the filter can effectively filter impurities and avoid mechanical seal wear. The flushing pipelines are arranged in parallel. When the filter on one of the flushing pipelines is blocked by accumulated impurities, the other flushing pipeline can be used for flushing, effectively preventing dry grinding of the mechanical seal sealing surface and reducing the temperature of the mechanical seal, and ensuring the service life of the mechanical seal. Brief Description of the Drawings

[0028] Figure 1 is the front view of the overall structure of the present utility model.

[0029] Figure 2 is Figure 1 the view in the direction of F in

[0030] Reference numerals in the drawings: four-way - 1, outlet A - 101, outlet B - 102, exhaust port - 103;

[0031] liquid inlet pipe A one - 201, three-way A - 202, inlet A one - 2021, left outlet A one - 2022, right outlet A one - 2023, left liquid inlet pipe A two - 203, right liquid inlet pipe A two - 204;

[0032] liquid inlet pipe B one - 301, three-way B - 302, inlet B one - 3021, left outlet B one - 3022, right outlet B one - 3023, left liquid inlet pipe B two - 303, right liquid inlet pipe B two - 304;

[0033] left three-way - 401, inlet A two - 4011, inlet B two - 4012, lower left outlet - 4013;

[0034] right three-way - 402, inlet A three - 4021, inlet B three - 4022, lower right outlet - 4023;

[0035] left liquid outlet pipe - 501, right liquid outlet pipe - 502;

[0036] solenoid valve A one - 601, solenoid valve A two - 602, solenoid valve B one - 603, solenoid valve B two - 604;

[0037] pressure sensor A one - 701, pressure sensor A two - 702, pressure sensor B one - 703, pressure sensor B two - 704;

[0038] filter A - 801, filter B - 802;

[0039] ferrule fitting - 9;

[0040] pump - 10. Detailed Description of the Preferred Embodiment

[0041] The present utility model will be described below with reference to the drawings and embodiments.

[0042] Embodiment 1:

[0043] As shown in the attached drawings, a flushing pipeline for a pump mechanical seal includes a flushing pipeline A and a flushing pipeline B arranged in parallel. The liquid inlet ends of the flushing pipeline A and the flushing pipeline B flow in flushing liquid. The liquid outlet ends of the flushing pipeline A and the flushing pipeline B are connected to the flushing channel on the pump 10, and the flushing liquid enters the mechanical seal cavity through the flushing channel.

[0044] A filter A801 is installed on the flushing pipeline A, and a filter B802 is installed on the flushing pipeline B.

[0045] The setting of the filter can effectively filter impurities and avoid mechanical seal wear. The parallel arrangement of the flushing pipelines is provided. When the filter on one of the flushing pipelines is blocked by accumulated impurities, flushing can be carried out through the other flushing pipeline, effectively preventing dry grinding of the mechanical seal sealing surface and reducing the temperature of the mechanical seal, and ensuring the service life of the mechanical seal.

[0046] The flushing pipeline A includes a liquid inlet pipe A1 201, a tee A202, a left liquid inlet pipe A2 203, and a right liquid inlet pipe A2 204. The tee A202 includes an inlet A1 2021, a left outlet A1 2022, and a right outlet A1 2023. The inlet A1 2021 of the tee A202 is connected to the liquid outlet end of the liquid inlet pipe A1 201. The left outlet A1 2022 is connected to the liquid inlet end of the left liquid inlet pipe A2 203, and the right outlet A1 2023 is connected to the liquid inlet end of the right liquid inlet pipe A2 204. A filter A801 is installed on the liquid inlet pipe A1 201. An electromagnetic valve A1 601 is installed on the liquid inlet pipe A1 201 on the front side of the filter A801, and an electromagnetic valve A2 602 is installed on the rear side. A pressure sensor A1 701 is installed on the liquid inlet pipe A1 201 on the front side of the filter A801, and a pressure sensor A2 702 is installed on the rear side.

[0047] The flushing pipeline B includes a liquid inlet pipe B1 301, a tee B302, a left liquid inlet pipe B2 303, and a right liquid inlet pipe B2 304. The tee B302 includes an inlet B1 3021, a left outlet B1 3022, and a right outlet B1 3023. The inlet B1 3021 of the tee B302 is connected to the liquid outlet end of the liquid inlet pipe B1 301. The left outlet B1 3022 is connected to the liquid inlet end of the left liquid inlet pipe B2 303, and the right outlet B1 3023 is connected to the liquid inlet end of the right liquid inlet pipe B2 304. A filter B802 is installed on the liquid inlet pipe B1 301. An electromagnetic valve B1 603 is installed on the liquid inlet pipe B1 301 on the front side of the filter B, and an electromagnetic valve B2 604 is installed on the rear side. A pressure sensor B1 703 is installed on the liquid inlet pipe B1 301 on the front side of the filter 802, and a pressure sensor B2 704 is installed on the rear side.

[0048] The structural setting of the flushing pipeline can achieve the simultaneous flushing of the mechanical seals on both sides of the pump. The structure is simple and the flushing is convenient. When the filter is blocked, the control valves on both sides are closed, which is convenient for cleaning and maintenance of the filter. By installing pressure sensors on both sides of the filter, when the pressure difference between the two pressure sensors is large, it is determined that the filter is blocked, and this flushing pipeline can be closed in time, and flushing is carried out through another flushing pipeline to ensure that the flushing effect of the mechanical seal is not affected, and it can effectively avoid the problem of single-channel flushing blockage during the operation of the pump and the need for shutdown maintenance.

[0049] In this embodiment, the control valves are solenoid valves. Solenoid valve A-601, solenoid valve A-602, solenoid valve B-603, and solenoid valve B-604 are respectively connected to the controller, and manual valves can also be selected according to actual needs; pressure sensors A-701, pressure sensors A-702, pressure sensors B-703, and pressure sensors B-704 are respectively connected to the controller; the controller can adopt a PLC controller or a controller developed based on an MCU.

[0050] The structure of the filter is prior art and will not be elaborated in detail here.

[0051] This embodiment further includes a left three-way joint 401, a right three-way joint 402, a left liquid outlet pipe 501, and a right liquid outlet pipe 502. The left three-way joint 401 includes an inlet A-4011, an inlet B-4012, and a lower left outlet 4013. The inlet A-4011 of the left three-way joint 401 is communicated with the liquid outlet end of the left inlet pipe A-203, the inlet B-4012 is communicated with the liquid outlet end of the left inlet pipe B-203, and the lower left outlet 4013 is communicated with the liquid inlet end of the left liquid outlet pipe 501. The liquid outlet end of the left liquid outlet pipe 501 is communicated with the left flushing channel on the pump 10;

[0052] The right three-way joint 402 includes an inlet A-4021, an inlet B-4022, and a lower right outlet 4023. The inlet A-4021 of the right three-way joint 402 is communicated with the liquid outlet end of the right inlet pipe A-204, the inlet B-4022 is communicated with the liquid outlet end of the right inlet pipe B-204, and the lower right outlet 4023 is communicated with the liquid inlet end of the right liquid outlet pipe 502. The liquid outlet end of the right liquid outlet pipe 502 is communicated with the right flushing channel on the pump 10;

[0053] The left inlet pipe A-203, the right inlet pipe A-204, the left inlet pipe B-203, and the right inlet pipe B-204 are set in an L shape; so that the liquid outlet end of the left inlet pipe A-203 and the liquid outlet end of the left inlet pipe B-203 are close to each other and are communicated through the left three-way joint 401, and the liquid outlet end of the right inlet pipe A-204 and the liquid outlet end of the right inlet pipe B-204 are close to each other and are communicated through the right three-way joint 402, realizing the connection of the parallel flushing pipeline A and the flushing pipeline B. The pipeline connection structure is simple and the installation is convenient.

[0054] The liquid inlet ends of the liquid inlet pipe A-201 and the liquid inlet pipe B-301 are provided with a four-way joint 1. The four-way joint 1 includes an inlet, an outlet A101, an outlet B102 and an exhaust port 103. The inlet of the four-way joint 1 is communicated with the flushing liquid inlet pipe, the outlet A101 is communicated with the liquid inlet end of the liquid inlet pipe A-201, and the outlet B102 is communicated with the liquid inlet end of the liquid inlet pipe B-301; to realize the communication of the liquid inlets of the flushing pipeline A and the flushing pipeline B.

[0055] In this embodiment, with the four-way joint 1 as the center, the left three-way joint 401 is located on the left side of the four-way joint 1, the right three-way joint 402 is located on the right side of the four-way joint 1, the three-way joint A202 is located in front of the four-way joint 1, and the three-way joint B302 is located behind the four-way joint 1. The liquid inlet pipe A-201 extends forward and is connected to the four-way joint 1 and the three-way joint A202 through a ferrule joint 9. The liquid inlet pipe B-301 extends backward and is connected to the four-way joint 1 and the three-way joint B302 through a ferrule joint 9. The left liquid inlet pipe A-203 is L-shaped and is connected to the three-way joint A202 and the left three-way joint 401 through a ferrule joint 9. The right liquid inlet pipe A-204 is L-shaped and is connected to the three-way joint A202 and the right three-way joint 402 through a ferrule joint 9. The left liquid inlet pipe B-303 is L-shaped and is connected to the three-way joint B302 and the left three-way joint 401 through a ferrule joint 9. The right liquid inlet pipe B-304 is L-shaped and is connected to the three-way joint B302 and the right three-way joint 402 through a ferrule joint 9. The left liquid inlet pipe A-203, the right liquid inlet pipe A-204, the left liquid inlet pipe B-303 and the right liquid inlet pipe B-304 enclose a frame structure, which is simple in structure and convenient for installation.

[0056] The flushing liquid inlet pipe extends into the pump 10; the mechanical seal is flushed by the high-pressure liquid in the pump, without the need for an external flushing liquid, with a simple structure and low cost.

[0057] In this embodiment, this flushing pipeline is applied to a split-case pump. The flushing liquid inlet pipe extends into the pump through the pump cover and can also be applied to other pumps according to needs.

[0058] When the utility model is in use:

[0059] 1. The controller controls solenoid valve B-603 and solenoid valve B-604 to be in the closed state, and solenoid valve A-601 and solenoid valve A-602 to be in the open state. First, flush fluid is provided to the mechanical seal through flushing pipeline A. During the operation of pump 10, the high-pressure flush fluid in the pump enters inlet pipe A-201 through the flushing inlet pipe and four-way joint 1, and successively passes through solenoid valve A-601, pressure sensor A-701, filter A801, pressure sensor A-702, and solenoid valve A-602 before entering tee joint A202. The flush fluid is then divided into two paths. One path enters the mechanical seal cavity on the left side of the pump through left inlet pipe A-203 and left outlet pipe 501, and the other path enters the mechanical seal cavity on the right side of the pump through right inlet pipe A-204 and right outlet pipe 502, flushing the two mechanical seals simultaneously. During this process, pressure sensor A-701 and pressure sensor A-702 upload the detected pressure signals to the controller;

[0060] 2. When the controller determines that the pressure difference between pressure sensor A-701 and pressure sensor A-702 is greater than the set value, it indicates that filter A801 is blocked. At this time, the controller controls solenoid valve B-603 and solenoid valve B-604 to open, and solenoid valve A-601 and solenoid valve A-602 to close, providing flush fluid to the mechanical seal through flushing pipeline B, effectively avoiding the situation of single-path flushing blockage during pump operation and the need for shutdown for maintenance;

[0061] 3. The high-pressure flush fluid in the pump enters inlet pipe B-301 through the flushing inlet pipe and four-way joint 1, and successively passes through solenoid valve B-603, pressure sensor B-703, filter B802, pressure sensor B-704, and solenoid valve B-604 before entering tee joint B302. The flush fluid is then divided into two paths. One path enters the mechanical seal cavity on the left side of the pump through left inlet pipe B-303 and left outlet pipe 501, and the other path enters the mechanical seal cavity on the right side of the pump through right inlet pipe B-304 and right outlet pipe 502, flushing the two mechanical seals simultaneously. During this process, pressure sensor B-703 and pressure sensor B-704 upload the detected pressure signals to the controller;

[0062] 4. During the flushing process using flushing pipeline B or when the pump stops running, filter A801 can be repaired and cleaned.

[0063] Embodiment 2:

[0064] Embodiment 2 is a structure adopting single-path flushing. A filter is installed on the flushing pipeline. A solenoid valve one and a pressure sensor one are installed at the inlet end of the filter on the flushing pipeline, and a solenoid valve two and a pressure sensor two are installed at the outlet end of the filter;

[0065] The settings of the filter can effectively filter impurities and avoid mechanical seal wear. By installing pressure sensors on both sides of the filter, when the pressure difference between the two pressure sensors is large, it is determined that the filter is blocked, and this flushing pipeline can be promptly closed for maintenance and cleaning.

[0066] The flushing pipeline includes a first liquid inlet pipe, a second left liquid inlet pipe, a second right liquid inlet pipe, and a tee. The tee includes an inlet, a left outlet, and a right outlet. The inlet of the tee is communicated with the liquid outlet end of the first liquid inlet pipe, the left outlet is communicated with the liquid inlet end of the second left liquid inlet pipe, and the right outlet is communicated with the liquid inlet end of the second right liquid inlet pipe. A filter is installed on the first liquid inlet pipe, the liquid inlet end of the first liquid inlet pipe extends into the pump, the liquid outlet end of the second left liquid inlet pipe extends into the mechanical seal cavity of the pump, and the liquid outlet end of the second right liquid inlet pipe extends into the mechanical seal cavity of the pump;

[0067] The structural setting of the flushing pipeline can achieve the flushing of the mechanical seals on both sides of the pump simultaneously. The structure is simple and the flushing is convenient. The mechanical seal is flushed by the liquid in the pump without external flushing liquid, with a simple structure and low cost.

[0068] In this embodiment, the first solenoid valve, the second solenoid valve, the first pressure sensor, and the second pressure sensor are respectively connected to the controller, and the controller can adopt a PLC controller or a controller developed based on an MCU.

[0069] When the utility model is in use:

[0070] 1. The controller controls the first solenoid valve and the second solenoid valve to open. During the operation of the pump, the high-pressure flushing liquid in the pump sequentially passes through the first liquid inlet pipe, the first solenoid valve, the first pressure sensor, the filter, the second pressure sensor, and the second solenoid valve and then enters the tee. The flushing liquid is then divided into two paths. One path enters the mechanical seal cavity on the left side of the pump through the second left liquid inlet pipe, and the other path enters the mechanical seal cavity on the right side of the pump through the second right liquid inlet pipe, flushing the two mechanical seals simultaneously. During this process, the first pressure sensor and the second pressure sensor upload the detected pressure signals to the controller;

[0071] 2. When the pressure difference between the first pressure sensor and the second pressure sensor is greater than the set value, it indicates that the filter is blocked, and the operator can promptly clean or repair the filter.

Claims

1. A flushing pipeline for a pump mechanical seal, characterized in that: It comprises a flushing pipeline A and a flushing pipeline B arranged in parallel, the liquid inlet end of the flushing pipeline A and the liquid inlet end of the flushing pipeline B flow into the flushing liquid, and the liquid outlet end of the flushing pipeline A and the liquid outlet end of the flushing pipeline B are connected to the flushing channel on the pump; The flushing pipeline A includes a liquid inlet pipe A1, a tee A, a left liquid inlet pipe A2 and a right liquid inlet pipe A2, the tee A includes an inlet A1, a left outlet A1 and a right outlet A1, the inlet A1 of the tee A is connected to the liquid outlet end of the liquid inlet pipe A1, the left outlet A1 is connected to the liquid inlet end of the left liquid inlet pipe A2, the right outlet A1 is connected to the liquid inlet end of the right liquid inlet pipe A2, and a filter A is installed on the liquid inlet pipe A1; The flushing pipeline B includes an inlet pipe B1, a tee B, a left inlet pipe B2 and a right inlet pipe B2. The tee B includes an inlet B1, a left outlet B1 and a right outlet B1. The inlet B1 of the tee B is connected to the liquid outlet end of the liquid inlet pipe B1, the left outlet B1 is connected to the liquid inlet end of the left liquid inlet pipe B2, and the right outlet B1 is connected to the liquid inlet end of the right liquid inlet pipe B2. A filter B is installed on the liquid inlet pipe B1.

2. A flushing pipeline for a pump mechanical seal according to claim 1, characterized in that: The flushing pipeline A is provided with a control valve A1 on the front side of the filter A and a control valve A2 on the rear side; The flushing pipeline B is provided with a control valve B1 on the front side of the filter B, and a control valve B2 on the rear side.

3. A pump mechanical seal flushing pipeline according to claim 2, characterized in that: The flushing pipeline A is provided with a pressure sensor A1 on the front side of the filter A and a pressure sensor A2 on the rear side; The flushing pipeline B is provided with a pressure sensor B1 on the front side of the filter B, and a pressure sensor B2 on the rear side.

4. A pump mechanical seal flushing pipeline according to claim 1, 2 or 3, characterized in that: It also includes a left three-way valve, a right three-way valve, a left liquid outlet pipe and a right liquid outlet pipe, the left three-way valve includes an inlet A2, an inlet B2 and a lower left outlet, the inlet A2 of the left three-way valve is connected to the liquid outlet end of the left liquid inlet pipe A2, the inlet B2 is connected to the liquid outlet end of the left liquid inlet pipe B2, the lower left outlet is connected to the liquid inlet end of the left liquid outlet pipe, and the liquid outlet end of the left liquid outlet pipe is connected to the left flushing channel on the pump; The right three-way valve comprises an inlet A3, an inlet B3 and a lower right outlet. The inlet A3 of the right three-way valve is connected to the liquid outlet end of the right liquid inlet pipe A2, the inlet B3 is connected to the liquid outlet end of the right liquid inlet pipe B2, the lower right outlet is connected to the liquid inlet end of the right liquid outlet pipe, and the liquid outlet end of the right liquid outlet pipe is connected to the right flushing channel on the pump.

5. A pump mechanical seal flushing pipeline according to claim 1, 2 or 3, characterized in that: The left liquid inlet pipe A2, the right liquid inlet pipe A2, the left liquid inlet pipe B2, and the right liquid inlet pipe B2 are arranged in an L shape.

6. A pump mechanical seal flushing pipeline according to claim 1, 2 or 3, characterized in that: The liquid inlet ends of the flushing pipeline A and the liquid inlet ends of the flushing pipeline B are provided with a four-way valve, which includes an inlet, an outlet A, an outlet B and an exhaust port. The inlet of the four-way valve is connected to the flushing liquid inlet pipe, the outlet A is connected to the liquid inlet end of the liquid inlet pipe A1, and the outlet B is connected to the liquid inlet end of the liquid inlet pipe B1.

7. A pump mechanical seal flushing pipeline according to claim 6, characterized in that: The flushing liquid inlet pipe extends into the pump.

8. A flushing pipeline for a pump mechanical seal, characterized in that: A filter is installed on the flushing pipeline. A control valve 1 and a pressure sensor 1 are installed on the liquid inlet end of the filter, and a control valve 2 and a pressure sensor 2 are installed on the liquid outlet end of the filter.

9. A pump mechanical seal flushing pipeline according to claim 8, characterized in that: The flushing pipeline includes an inlet pipe 1, a left inlet pipe 2, a right inlet pipe 2 and a tee. The tee includes an inlet, a left outlet and a right outlet. The inlet of the tee is connected to the liquid outlet end of the inlet pipe 1, the left outlet is connected to the liquid inlet end of the left inlet pipe 2, and the right outlet is connected to the liquid inlet end of the right inlet pipe 2. A filter is installed on the inlet pipe 1, and the liquid inlet end of the inlet pipe 1 extends into the pump.

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