High-viscosity oil filtering device and filtering method

Abstract

The invention belongs to the technical field of filtration or the field of synthetic ester purification, and particularly relates to a high-viscosity oil filtering device and a filtering method. In the high-viscosity oil filtering device, a reciprocating pump is selected as a liquid pressurizing device, the reciprocating pump is divided into a plurality of branch pipelines with a piston motion function, and the branch pipelines can jointly or independently carry out piston motion. The pressurization mode of the high-viscosity oil filtering device is changed from a gas pressurization mode to a liquid pressurization mode, the liquid compression coefficient is small, the pressure applied by the reciprocating pump can immediately act on a crude product, and the pressure intensity can be increased greatly in a short time; the pressure intensity of the filtering device can be rapidly reduced when leakage occurs, synthetic ester products cannot be splashed massively, and the safety coefficient is improved; besides, on the premise that the applied external force is not changed, the stressed area can be reduced to provide higher pressure by selecting fewer first pistons, so that the filtering speed of high-viscosity crude products such as malate or benzoate plasticizers is further increased.

Description

Technical Field

[0001] The invention belongs to the field of filtering technology or the field of high-viscosity oily sample purification, and particularly relates to a high-viscosity oil filtering device and a filtering method. Background Art

[0002] When facing high-viscosity samples, such as paint, honey, etc., and in the production of synthetic esters, crude products such as malic acid esters or benzoic acid ester plasticizers need to go through a filtering process. However, due to the excessive viscosity of synthetic esters, the filtration time is too long, which affects the experimental process. The reason is that the limit of the vacuum pump is -0.1MPa. The high price of high-pressure air pumps will lead to excessively high production costs. Moreover, the high pressure of the air pump is generated by compressed air. The compression coefficient of the gas is large. In order to achieve high air pressure, more volume of gas is often compressed; when the filtration is completed, there are too few crude products on the filter screen to form a closed system. The moment the high-pressure gas leaks, it is easy to produce a large amount of synthetic ester products splashing, resulting in experimental accidents. Plate pressure filtration and other methods have problems such as large footprint, high energy consumption, and high maintenance costs.

[0003] Therefore, it is particularly important to provide a high-viscosity oil filtering device and filtering method that can provide high-pressure filtration at a low cost, while improving the safety factor and preventing a large amount of synthetic ester product splashing due to the leakage of high-pressure gas at the moment when the filtration is completed. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. To this end, the present invention proposes a high-viscosity oil filtering device and filtering method; the filtering device can provide a high-pressure filtering means at a low cost, while improving the safety factor and preventing a large amount of liquid or gas splashing due to leakage.

[0005] The concept of the present invention is as follows: the pressurization method of the filtering device is changed from gas pressurization to liquid pressurization. The liquid has a small compression coefficient, and the pressure applied by the reciprocating pump can immediately act on the crude product, and a large pressure can be increased in a short time. At the same time, when a leak occurs in the filtering device, the pressure will drop rapidly, and the synthetic ester product will not splash in large quantities, thereby improving the safety factor.

[0006] A first aspect of the present invention provides a high-viscosity oil filtering device.

[0007] Specifically, a high-viscosity oil filtering device comprises a housing, a cavity disposed in the housing, a filtering mechanism disposed at the bottom of the housing and connected to the cavity, a sample addition port disposed on the outer wall of the housing and connected to the cavity, and a reciprocating pump disposed at the top of the housing; The sample injection port includes a first one-way valve for one-way flow to the cavity; The reciprocating pump includes a main pipeline and more than or equal to two branch pipelines, one side of the main pipeline is connected to the cavity, and the other side of the main pipeline is connected to each of the branch pipelines, and the branch pipelines have the same direction; each of the branch pipelines also includes a first piston that can move airtightly up and down on the inner wall of the branch pipeline, and a connecting rod with one end connected to the first piston and the other end located outside the branch pipeline. The connecting rod also includes a lock on the end outside the branch pipeline, and each of the locks can be snap-fitted and unlocked with each other.

[0008] The sample adding port is used for adding samples to the cavity; The filtering mechanism is used to filter the sample in the cavity; The reciprocating pump is used to pressurize the sample in the cavity.

[0009] Compared with the prior art, the first aspect provides a high-viscosity oil filtering device with the following beneficial effects: the pressurization method of the filtering device is changed from gas pressurization to liquid pressurization, the liquid compression coefficient is small, and the pressure applied by the reciprocating pump can act on the crude product immediately, and a large pressure can be increased in a short time; at the same time, the pressure of the filtering device will drop rapidly when a leak occurs, and the synthetic ester product will not splash in large quantities, thereby improving the safety factor; in addition, for synthetic ester samples with higher viscosity, it is possible to choose to use fewer first pistons to reduce the force-bearing area to provide a greater pressure, while keeping the applied external force unchanged, and it can be deduced from Pascal's law that the pressure at the filter screen is therefore increased.

[0010] Preferably, the high-viscosity oil filtering device further comprises an exhaust valve disposed on the top of the housing and connected to the cavity. The exhaust valve is used to exhaust the cavity.

[0011] Preferably, the number of the branch pipes is 2-20; further preferably, the number of the branch pipes is 2-10; further preferably, the number of the branch pipes is 2-5.

[0012] Preferably, the ratio of the sum of the cross-sections of the first pistons to the filter area of ​​the filter mechanism is less than or equal to 0.5; further preferably, the ratio of the sum of the cross-sections of the first pistons to the filter area of ​​the filter mechanism is less than or equal to 0.3; further preferably, the ratio of the sum of the cross-sections of the first pistons to the filter area of ​​the filter mechanism is less than or equal to 0.1. When the same external force is applied to the reciprocating pump, the smaller the ratio of the sum of the cross-sections of the first pistons to the filter area of ​​the filter mechanism, the greater the pressure on the filter surface of the filter mechanism.

[0013] Preferably, the filtering mechanism also includes at least one of a filter screen, a sand core filter plate, a sieve plate, a filter paper, a ceramic filter plate, and a cotton filter plate.

[0014] Preferably, the filtering mechanism comprises two or more layers of the filter screens or sieve plates arranged in a stacked manner, each of which can rotate to cause relative displacement. The filter screens or sieve plates that can cause relative displacement can change the filtering accuracy by adjusting the degree of misalignment of the filter mesh or sieve holes.

[0015] Preferably, the cavity of the high-viscosity oil filtering device also includes a second piston capable of performing airtight up-and-down piston movement in the cavity, and the second piston divides the cavity into a hydraulic cavity in the upper part and a filter cavity in the lower part. Since the cross-sectional area of ​​the first piston in the reciprocating pump is much smaller than the filter area of ​​the filter mechanism, in order to ensure the filter flow, the piston often moves at a faster speed, and the heat generated by friction is often higher; when facing samples with poor stability, in order to prevent the deterioration of the sample due to frictional heating or other reasons in the reciprocating pump, using the second piston to divide the cavity into a hydraulic cavity and a filter cavity can effectively separate the sample from the reciprocating pump, thereby improving the stability of the sample during the filtration process.

[0016] The hydraulic chamber is used to be filled with hydraulic fluid; further preferably, the hydraulic chamber also includes hydraulic fluid that fills the hydraulic chamber.

[0017] Preferably, the type of the hydraulic fluid includes at least one of water-based hydraulic fluid, hydrocarbon oil-based hydraulic fluid, alcohol-based hydraulic fluid, acid-based hydraulic fluid and ester-based hydraulic fluid.

[0018] Preferably, the sample adding port is communicated with the filter chamber, and the communicating point is outside the movable range of the second piston.

[0019] Preferably, one side of the main pipeline is connected to the hydraulic chamber, and the other side of the main pipeline is connected to each of the branch pipelines.

[0020] Preferably, the side of the main pipeline connected to the cavity also includes a second one-way valve for one-way flow to the cavity, and the side of the main pipeline connected to the branch pipeline also includes a liquid inlet, and the liquid inlet also includes a third one-way valve for one-way flow to the main pipeline; further preferably, the side of the main pipeline connected to the hydraulic chamber also includes a second one-way valve for one-way flow to the hydraulic chamber, and the side of the main pipeline connected to the branch pipeline also includes a liquid inlet, and the liquid inlet also includes a third one-way valve for one-way flow to the main pipeline. By adding a liquid inlet and a one-way valve to the main pipeline in the reciprocating pump, the range of motion of the second piston can be increased by connecting a liquid storage tank externally.

[0021] Preferably, the high-viscosity oil filtering device further comprises a liquid storage barrel, and the bottom of the liquid storage barrel is connected to the liquid inlet.

[0022] Preferably, the liquid storage barrel further includes a reflux pipe, the reflux pipe is connected to the hydraulic chamber, and the reflux pipe further includes a valve; further preferably, the connection between the reflux pipe and the hydraulic chamber is located outside the movable range of the second piston. By providing the reflux pipe, when the sample is continuously added and the valve is opened, the hydraulic fluid in the hydraulic chamber can flow back to the liquid storage barrel, and the second piston rises to form a cycle.

[0023] Preferably, the liquid inlet further comprises a pressure pump with the pressurizing direction toward the cavity.

[0024] Preferably, the bottom of the high-viscosity oil filtering device further includes wheels, and the wheels are used to move the filtering device.

[0025] Preferably, the bottom of the housing further comprises a liquid collection port with a closed design, and the liquid collection port is located below the filtering mechanism. After the liquid collection port is installed, a packaging bag can be directly connected or the sample can be connected to a pipeline of another reaction system.

[0026] Preferably, the housing can be designed to be partially detachable, which is conducive to the disassembly and cleaning of the high-viscosity oil filter.

[0027] A second aspect of the present invention provides a high-viscosity oil filtering method, wherein the high-viscosity oil filtering method uses any of the above-mentioned high-viscosity oil filtering devices for filtering.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The pressurization method of the filter device is changed from gas pressurization to liquid pressurization. The liquid has a small compressibility coefficient, and the pressure applied by the reciprocating pump can act on the crude product immediately, which can increase the pressure in a short time. At the same time, when the filter device leaks, the pressure will drop rapidly, and the synthetic ester product will not splash in large quantities, thereby improving the safety factor. In addition, for synthetic ester samples with high viscosity, under the premise that the applied external force remains unchanged, it is possible to choose to use fewer first pistons to reduce the force-bearing area to provide a greater pressure. According to Pascal's law, it can be deduced that the pressure at the filter screen is therefore increased. (2) Since the cross-sectional area of ​​the first piston in the reciprocating pump is much smaller than the filtration area of ​​the filtration mechanism, in order to ensure the filtration flow, the piston often moves at a faster speed, and the heat generated by friction is often higher. When facing samples with poor stability, in order to prevent frictional heating in the reciprocating pump or other reasons from causing the sample to deteriorate, using a second piston to divide the cavity into a hydraulic cavity and a filtration cavity can effectively separate the sample from the reciprocating pump, thereby improving the stability of the sample during the filtration process. (3) By providing a liquid filling port in the reciprocating pump and an additional liquid storage tank, the second piston can have a larger range of motion; and after adding a reflux pipe, the second piston can form a motion cycle; at the same time, the partially detachable design is conducive to the disassembly and cleaning of the high-viscosity oil filter device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of a high-viscosity oil filtering device according to an embodiment of the present invention; Figure 2 is a schematic diagram of a high viscosity oil filtering device according to Example 1; Reference numerals: Shell 100, cavity 110, hydraulic cavity 111, filter cavity 112, filter mechanism 120, sample adding port 130, first one-way valve 131, reciprocating pump 140, main pipeline 141, branch pipeline 142, first piston 143, connecting rod 144, buckle 145, second one-way valve 146, liquid inlet 147, third one-way valve 148, second piston 150, liquid storage barrel 160, reflux pipe 161, valve 162. DETAILED DESCRIPTION

[0030] In order to make the technical solution of the present invention more clearly understood by those skilled in the art, the following embodiments are listed for illustration. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. It should be noted that the following embodiments do not limit the scope of protection claimed by the present invention.

[0031] Reference Figure 1 , Figure 1 Schematic diagram of the structure of a high-viscosity oil filtering device according to an embodiment of the present invention, comprising a housing 100, a cavity 110 disposed in the housing 100, a filtering mechanism 120 disposed at the bottom of the housing 100 and connected to the cavity 110, a sample addition port 130 disposed on the outer wall of the housing 100 and connected to the cavity 110, and a reciprocating pump 140 disposed at the top of the housing 100; The sample injection port 130 includes a first one-way valve 131 for one-way flow to the cavity 110; The reciprocating pump 140 includes a main pipeline 141 and more than or equal to two branch pipelines 142. One side of the main pipeline 141 is connected to the cavity 110, and the other side of the main pipeline 141 is connected to each branch pipeline 142, and the direction of each branch pipeline 142 is the same; each branch pipeline 142 also includes a first piston 143 that can move up and down in an airtight piston manner on the inner wall of the branch pipeline 142, and a connecting rod 144 with one end connected to the first piston 143 and the other end located outside the branch pipeline 142. The connecting rod 144 also includes a lock 145 on the outer end of the branch pipeline 142, and each lock 145 can be respectively snap-fitted and unlocked with each other.

[0032] The sample adding port 130 is used for adding samples to the cavity 110; The filtering mechanism 120 is used to filter the sample in the cavity 110; The reciprocating pump 140 is used to pressurize the sample in the chamber 110 .

[0033] Compared with the prior art, the first aspect provides a high-viscosity oil filtering device with the following beneficial effects: the pressurization method of the filtering device is changed from gas pressurization to liquid pressurization, the liquid compression coefficient is small, and the pressure applied by the reciprocating pump can act on the crude product immediately, and a large pressure can be increased in a short time; at the same time, the pressure of the filtering device will drop rapidly when a leak occurs, and the synthetic ester product will not splash in large quantities, thereby improving the safety factor; in addition, for synthetic ester samples with higher viscosity, it is possible to choose to use fewer first pistons to reduce the force-bearing area to provide a greater pressure, while keeping the applied external force unchanged, and it can be deduced from Pascal's law that the pressure at the filter screen is therefore increased.

[0034] According to some embodiments of the present invention, the high-viscosity oil filtering device further comprises an exhaust valve disposed on the top of the housing 100 and connected to the cavity 110. The exhaust valve is used to exhaust the cavity 110.

[0035] According to some embodiments of the present invention, the number of branch pipes 142 is 2-20; more preferably, the number of branch pipes 142 is 2-10; even more preferably, the number of branch pipes 142 is 2-5.

[0036] According to some embodiments of the present invention, the ratio of the sum of the cross-sections of the first pistons 143 to the filtering area of ​​the filtering mechanism 120 is less than or equal to 0.5; more preferably, the ratio of the sum of the cross-sections of the first pistons 143 to the filtering area of ​​the filtering mechanism 120 is less than or equal to 0.3; more preferably, the ratio of the sum of the cross-sections of the first pistons 143 to the filtering area of ​​the filtering mechanism 120 is less than or equal to 0.1. When the same external force is applied to the reciprocating pump, the smaller the ratio of the sum of the cross-sections of the first pistons to the filtering area of ​​the filtering mechanism, the greater the pressure on the filtering surface of the filtering mechanism.

[0037] According to some embodiments of the present invention, the filtering mechanism 120 further includes at least one of a filter screen, a sand core filter plate, a sieve plate, a filter paper, a ceramic filter plate, and a cotton filter plate.

[0038] According to some embodiments of the present invention, the filter mechanism 120 includes two or more layers of filter screens or sieve plates arranged in a stacked manner, and each filter screen or sieve plate can rotate to cause relative displacement. The filter screens or sieve plates that can cause relative displacement can change the filtering accuracy by adjusting the degree of misalignment of the filter grid or sieve hole.

[0039] According to some embodiments of the present invention, the cavity 110 of the high-viscosity oil filtering device further includes a second piston 150 capable of performing airtight up-and-down piston movement in the cavity 110, and the second piston 150 divides the cavity 110 into an upper hydraulic cavity 111 and a lower filter cavity 112. Since the cross-sectional area of ​​the first piston in the reciprocating pump is much smaller than the filter area of ​​the filter mechanism, in order to ensure the filter flow rate, the piston often moves at a faster speed, and the heat generated by friction is often higher; when facing samples with poor stability, in order to prevent the deterioration of the sample due to frictional heating or other reasons in the reciprocating pump, using the second piston to divide the cavity into a hydraulic cavity and a filter cavity can effectively separate the sample from the reciprocating pump, thereby improving the stability of the sample during the filtration process.

[0040] The hydraulic chamber 111 is used to be filled with hydraulic fluid; further preferably, the hydraulic chamber 111 also includes hydraulic fluid that fills the hydraulic chamber 111 .

[0041] According to some embodiments of the present invention, the type of hydraulic fluid includes at least one of water-based hydraulic fluid, hydrocarbon oil-based hydraulic fluid, alcohol-based hydraulic fluid, acid-based hydraulic fluid, and ester-based hydraulic fluid.

[0042] According to some embodiments of the present invention, the sample addition port 130 is communicated with the filter chamber 112 , and the communication point is outside the movable range of the second piston 150 .

[0043] According to some embodiments of the present invention, one side of the main pipeline 141 is connected to the hydraulic chamber 111 , and the other side of the main pipeline 141 is connected to each branch pipeline 142 .

[0044] According to some embodiments of the present invention, the side of the main pipeline 141 connected to the cavity 110 further includes a second one-way valve 146 for one-way flow to the cavity 110, and the side of the main pipeline 141 connected to the branch pipeline 142 further includes a liquid inlet 147, and the liquid inlet 147 further includes a third one-way valve 148 for one-way flow to the main pipeline 141; further preferably, the side of the main pipeline 141 connected to the hydraulic chamber 111 further includes a second one-way valve 146 for one-way flow to the hydraulic chamber 111, and the side of the main pipeline 141 connected to the branch pipeline 142 further includes a liquid inlet 147, and the liquid inlet 147 further includes a third one-way valve 148 for one-way flow to the main pipeline 141. By adding a liquid inlet and a one-way valve to the main pipeline in the reciprocating pump, the range of motion of the second piston can be increased by adding a liquid storage barrel to the outside.

[0045] According to some embodiments of the present invention, the high-viscosity oil filtering device further includes a liquid storage barrel 160 , and the bottom of the liquid storage barrel 160 is connected to the liquid inlet 147 .

[0046] According to some embodiments of the present invention, the liquid storage barrel 160 further includes a reflux pipe 161, which is connected to the hydraulic chamber 111, and further includes a valve 162; further preferably, the connection between the reflux pipe 161 and the hydraulic chamber 111 is located outside the movable range of the second piston 150. By providing the reflux pipe, when the sample is continuously added and the valve is opened, the hydraulic fluid in the hydraulic chamber can flow back to the liquid storage barrel, and the second piston rises to form a cycle.

[0047] According to some embodiments of the present invention, the liquid inlet 147 further includes a pressurizing pump with a pressurizing direction toward the cavity 110 .

[0048] According to some embodiments of the present invention, the bottom of the high-viscosity oil filtering device further includes wheels, and the wheels are used to move the filtering device.

[0049] According to some embodiments of the present invention, the bottom of the housing 100 further includes a liquid collection port with a closed design, and the liquid collection port is located below the filter mechanism 120. After the liquid collection port is installed, a packaging bag can be directly connected or the sample can be connected to a pipeline of another reaction system.

[0050] A second aspect of the present invention provides a synthetic ester filtering method, wherein the synthetic ester filtering method uses any of the above-mentioned high-viscosity oil filtering devices for filtering. Example 1

[0051] Reference Figure 2 , Figure 2 Schematic diagram of the structure of the high-viscosity oil filtering device of Example 1 of the present invention; comprising a housing 100, a cavity 110 disposed in the housing 100, a filtering mechanism 120 disposed at the bottom of the housing 100 and connected to the cavity 110, a sample addition port 130 disposed on the outer wall of the housing 100 and connected to the cavity 110, and a reciprocating pump 140 disposed at the top of the housing 100; The sample adding port 130 is used for adding samples to the cavity 110; The filtering mechanism 120 is used to filter the sample in the cavity 110; The reciprocating pump 140 is used to pressurize the sample in the cavity 110; The sample injection port 130 includes a first one-way valve 131 for one-way flow to the cavity 110; The reciprocating pump 140 includes a main pipeline 141 and two or more branch pipelines 142, one side of the main pipeline 141 is connected to the cavity 110, and the other side of the main pipeline 141 is connected to each branch pipeline 142, and each branch pipeline 142 has the same direction; each branch pipeline 142 also includes a first piston 143 that can move up and down the inner wall of the branch pipeline 142 in an airtight piston manner, a connecting rod 144 connected to the first piston 143 at one end and located outside the branch pipeline 142 at the other end, and the connecting rod 144 also includes a buckle 145 on the outer end of the branch pipeline 142, and each buckle 145 can be respectively buckled and fixed to each other and unlocked; the side of the main pipeline 141 connected to the cavity 110 also includes a second one-way valve 146 for one-way flow to the cavity 110, and the side of the main pipeline 141 connected to the branch pipeline 142 also includes a liquid inlet 147, and the liquid inlet 147 also includes a third one-way valve 148 for one-way flow to the main pipeline 141; The cavity 110 of the high-viscosity oil filtering device further includes a second piston 150 capable of performing airtight up-and-down piston movement in the cavity 110 , and the second piston 150 divides the cavity 110 into an upper hydraulic cavity 111 and a lower filtering cavity 112 ; The high-viscosity oil filtering device further includes a liquid storage barrel 160 , the bottom of which is connected to the liquid inlet 147 , and the liquid storage barrel 160 further includes a return pipe 161 , which is connected to the hydraulic chamber 111 , and the return pipe 161 further includes a valve 162 .

[0052] Filtering steps: (1) Add hydraulic fluid to the reservoir so that the hydraulic chamber and the reciprocating pump are filled with hydraulic fluid; (2) Open the valve in the reflux pipe and add sample to the sample inlet so that the filter chamber is filled with the sample to be filtered until the second piston above the filter chamber can no longer rise; (3) Close the valve in the reflux pipe, select the number of branch pipes to be operated by means of the lock switch, start the reciprocating pump, the second piston begins to descend, and pressure filtration begins.

[0053] Repeat steps (2) and (3) until the sample is filtered.

Claims

1. A high viscosity oil filtering device, characterized in that: It comprises a shell, a cavity arranged in the shell, a filtering mechanism arranged at the bottom of the shell and connected to the cavity, a sample adding port arranged on the outer wall of the shell and connected to the cavity, and a reciprocating pump arranged at the top of the shell; The sample injection port includes a first one-way valve for one-way flow to the cavity; The reciprocating pump includes a main pipeline and more than or equal to two branch pipelines, one side of the main pipeline is connected to the cavity, and the other side of the main pipeline is connected to each of the branch pipelines, and the branch pipelines have the same direction; each of the branch pipelines also includes a first piston that can move airtightly up and down on the inner wall of the branch pipeline, a connecting rod connected to the first piston and the other end of which is located outside the branch pipeline, and the connecting rod also includes a lock on the end outside the branch pipeline, and each of the locks can be respectively snap-fitted, fixedly connected and unlocked with each other.

2. The high viscosity oil filtering device according to claim 1, characterized in that: The high-viscosity oil filtering device further comprises an exhaust valve which is arranged on the top of the shell and connected to the cavity, and the exhaust valve is used to exhaust the cavity.

3. The high viscosity oil filtering device according to claim 1, characterized in that: The ratio of the sum of the cross-sections of the first pistons to the filtering area of ​​the filtering mechanism is less than or equal to 0.

5.

4. The high viscosity oil filtering device according to claim 1, characterized in that: The filtering mechanism also includes at least one of a filter screen, a sand core filter plate, a sieve plate, a filter paper, a ceramic filter plate, and a cotton filter plate.

5. The high viscosity oil filtering device according to claim 4, characterized in that: The filtering mechanism further comprises two or more layers of filter screens or sieve plates which are stacked and each of the filter screens or sieve plates can rotate relative to each other to cause relative displacement.

6. The high viscosity oil filtering device according to claim 1, characterized in that: The cavity of the high-viscosity oil filtering device further comprises a second piston capable of performing airtight up-and-down piston movement in the cavity, wherein the second piston divides the cavity into an upper hydraulic cavity and a lower filtering cavity, wherein the hydraulic cavity further comprises hydraulic fluid; The sample adding port is communicated with the filter cavity, and the communicating portion is outside the movable range of the second piston.

7. The high viscosity oil filtering device according to claim 6, characterized in that: The side of the main pipeline connected to the cavity also includes a second one-way valve for one-way flow toward the cavity, and the side of the main pipeline connected to the branch pipeline also includes a liquid inlet, and the liquid inlet also includes a third one-way valve for one-way flow toward the main pipeline.

8. The high viscosity oil filtering device according to claim 7, characterized in that: The high-viscosity oil filtering device also includes a liquid storage barrel, and the bottom of the liquid storage barrel is connected to the liquid inlet.

9. The high viscosity oil filtering device according to claim 8, characterized in that: The liquid storage barrel also includes a reflux pipe, which is communicated with the hydraulic chamber and further includes a valve.

10. A method for filtering high viscosity oil, characterized in that: The high-viscosity oil filtering method uses the high-viscosity oil filtering device described in any one of claims 1-9.

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