Pressure filter

Abstract

The invention discloses a pressure filter, and relates to the technical field of filters. The pressure filter comprises a liquid inlet pipeline, one end of the liquid inlet pipeline is communicated with a liquid inlet, and the other end of the liquid inlet pipeline is communicated with a filter assembly, so that liquid pressurized by a pump enters the liquid inlet pipeline from the liquid inlet; the containing groove is formed in the pressure filter and communicates with the liquid inlet pipeline through a first connecting pipeline, and one end of the containing groove communicates with a liquid suction-back opening of the pressure filter, so that liquid flowing into the liquid inlet pipeline returns to the pump from the liquid suction-back opening; and the overflow valve is arranged in the placing groove. According to the pressure filter disclosed by the invention, after the filter element of the filter assembly is blocked and the pressure is detected to exceed a threshold value, the overflow valve opens the liquid back-suction port, and liquid in the liquid inlet pipeline returns to the pump from the liquid back-suction port, so that the pressure filter can avoid overlarge pressure in the liquid inlet cavity of the pressure filter after the filter holes of the filter element are blocked.

Description

Technical Field

[0001] The present invention relates to the technical field of filters, and particularly to a pressure filter. Background Art

[0002] A pressure filter is a filter that operates under a specific pressure. Usually, its housing is a sealed steel tank, also known as a mechanical filter, and is widely used in various pipeline systems that require filtering media, especially in the pre-treatment of pure water preparation.

[0003] In the prior art, there are already some pressure filters. For example, the utility model patent with the publication number CN218011454U discloses a pressure filter, which includes a lower housing. A filter chamber is opened on the lower housing, and a filter element is arranged in the filter chamber. The filter element divides the filter chamber into a liquid inlet chamber and a liquid outlet chamber. A detachable upper housing for closing the filter chamber is connected to the opening of the filter chamber. A liquid inlet hole and a liquid outlet hole communicating with the liquid inlet chamber and the liquid outlet chamber are respectively opened on the upper housing. A plugging ring is opened on one side of the upper housing close to the lower housing, and the filter element is plugged on the plugging ring. An inner concave arc surface for abutting and fixing the filter element is formed at the bottom of the filter chamber. This application has the effects of reducing the occurrence of staff touching the filter element and improving the fixing stability of the filter element.

[0004] However, when too much contaminants accumulate on the surface of the filter element, it will cause the clogging of the filter holes, preventing the liquid from passing through the filter element normally and entering the system from the liquid outlet hole. However, liquid will always enter through the liquid inlet hole, resulting in a gradual increase in the pressure in the liquid inlet chamber. When the pressure is too high (exceeding the threshold), the contaminants on the surface of the filter element may enter the liquid outlet chamber due to the pressure and enter the system, thus contaminating the liquid used in the system and even damaging the components inside the filter, causing a series of adverse effects. Summary of the Invention

[0005] Aiming at the defects existing in the prior art, the technical problem solved by the present invention is: how to avoid excessive pressure in the liquid inlet chamber of the pressure filter when the filter holes of the filter element are clogged.

[0006] To achieve the above object, in a first aspect, the pressure filter provided by the present invention includes: A liquid inlet pipeline, one end of which is communicated with the liquid inlet, and the other end is communicated with the filtering component, so as to realize that the liquid pressurized by the pump enters the liquid inlet pipeline from the liquid inlet; A placement groove, which is opened inside the pressure filter, and the placement groove is communicated with the liquid inlet pipeline through a first connection pipeline. One end of the placement groove is communicated with the liquid back suction port of the pressure filter, so as to realize that the liquid flowing into the liquid inlet pipeline returns to the pump from the liquid back suction port; A relief valve, which is arranged inside the placement groove; Wherein, when the pressure in the liquid inlet pipeline exceeds the threshold value, the overflow valve opens the liquid suction port; when the pressure in the liquid inlet pipeline does not exceed the threshold value, the overflow valve closes the liquid suction port.

[0007] By adopting the above technical solution, after the filter element of the filter assembly is blocked, the pressure inside the liquid inlet pipeline gradually increases due to the continuous entry of liquid, resulting in an increase in the pressure inside the placement groove. When it is detected that the pressure exceeds the threshold value, the overflow valve opens the liquid suction port, and the liquid in the liquid inlet pipeline returns to the pump from the liquid suction port until the pressure in the liquid inlet pipeline does not exceed the threshold value, thereby preventing the pressure inside the liquid inlet pipeline from continuing to increase, causing the contaminants on the surface of the filter element to enter the liquid outlet cavity due to the pressure and enter the system, resulting in the problem of the liquid used in the system being contaminated. Therefore, this pressure filter can prevent the pressure in the liquid inlet cavity of the pressure filter from being too high when the filter holes of the filter element are blocked.

[0008] Combined with the first invention, in one embodiment, the overflow valve includes a plug and a sealing assembly. The plug is arranged at the end of the placement groove, and a through hole is formed inside the plug to connect the inside of the placement groove with the liquid suction port. The sealing assembly is arranged at one end of the through hole away from the liquid suction port, and the sealing assembly is movably arranged inside the placement groove to connect and disconnect the through hole and the inside of the placement groove.

[0009] By adopting the above technical solution, only by moving the sealing assembly inside the placement groove can the conversion between the open and closed states of the overflow valve be realized, and the change of the pressure inside the liquid inlet pipeline can be responded to in a timely manner.

[0010] In one embodiment, the sealing assembly includes a clamping joint and a moving part. One end of the clamping joint is clamped with the inner wall of the through hole, and the other end of the clamping joint is fixedly connected with the moving part. The moving part is movably arranged on the inner wall of the placement groove, and the surface of the moving part connected with the clamping joint is a pushing surface. The radius of the clamping joint is smaller than the radius of the inner wall of the placement groove to realize the clamping and separation of the clamping joint and the through hole.

[0011] By adopting the above technical solution, the movement of the sealing assembly and the sealing of the through hole are realized through different structures, and they do not interfere with each other; at the same time, by adjusting the area of the pushing surface, the through hole and the placement groove can be connected under different pressure conditions.

[0012] In one embodiment, a sealing member is arranged between the periphery of the moving part and the inner wall of the placement groove to ensure that the liquid is only located in the space between the sealing assembly and the plug.

[0013] By adopting the above technical solution, it is avoided that the liquid flows into the inside of the placement groove through the gap between the periphery of the moving part and the inner wall of the placement groove, affecting the normal movement of the moving part; at the same time, the lateral movement of the moving part is limited to prevent the clamping joint from shifting, resulting in the inability of the clamping joint to be clamped with the through hole.

[0014] In one embodiment, a limiting member is fixedly arranged at one end of the moving member away from the clamping joint, and the limiting member is used to abut against one end of the placing groove away from the liquid suction port.

[0015] By adopting the above technical solution, the excessive movement of the moving member is avoided, which may cause the clamping joint to fail to be normally clamped with the through hole after the subsequent pressure decreases.

[0016] In one embodiment, a limiting groove is formed at one end of the placing groove away from the liquid suction port, and one end of the limiting member away from the clamping joint is inserted into the interior of the limiting groove.

[0017] By adopting the above technical solution, the lateral movement of the moving member is further limited.

[0018] In one embodiment, a spring-back assembly is arranged between the moving member and one end of the placing groove away from the liquid suction port, and the spring-back assembly is sleeved on the limiting member.

[0019] By adopting the above technical solution, after the moving member moves towards one end of the placing groove away from the liquid suction port, the spring-back assembly will be compressed to generate a force to make the moving member return to the initial position; at the same time, the spring-back force of the spring-back assembly strengthens the clamping stability between the clamping joint and the through hole; at the same time, the spring-back assembly is sleeved on the limiting member to prevent the spring-back assembly from being bent during compression, resulting in the deviation of the spring-back force direction.

[0020] In one embodiment, an integrated pipeline is connected to the filtering assembly, and a plurality of liquid outlet pipelines are arranged on the integrated pipeline. One end of the liquid outlet pipeline is communicated with the interior of the integrated pipeline, and the other end of the liquid outlet pipeline is communicated with the liquid outlet to enable the liquid filtered by the filtering assembly to flow out through the liquid outlet.

[0021] By adopting the above technical solution, the filtered liquid can be concentrated inside the integrated pipeline, and then the number of the liquid outlet pipelines and the liquid outlets can be designed according to actual needs, so as to improve the applicability of the pressure filter; at the same time, the integrated pipeline can simplify the pipeline structure inside the pressure filter.

[0022] In one embodiment, a second connecting pipeline is arranged between the integrated pipeline and the placing groove. One end of the second connecting pipeline is communicated with the interior of the integrated pipeline, and the other end of the second connecting pipeline is communicated with the interior of the placing groove to form a pressure difference between the first connecting pipeline and the second connecting pipeline.

[0023] By adopting the above technical solution, the integrated pipeline can not only simplify the pipeline structure inside the pressure filter, but also enable the interior of the placing groove on one side of the sealing assembly to communicate with the outside, so as to generate a pressure difference between the interiors of the placing grooves on both sides of the sealing assembly, thereby pushing the sealing assembly to move and realizing the connection and disconnection between the through hole and the interior of the placing groove.

[0024] In a second aspect, a method for using the pressure filter provided by the present invention includes the following steps: The liquid pressurized by the pump enters the inside of the liquid inlet pipeline from the liquid inlet; If the filter element of the filter assembly is not completely blocked, the liquid is filtered through the filter assembly; The filtered liquid flows into the inside of the integrated pipeline, passes through the liquid outlet pipeline, and finally flows from the liquid outlet to the system; If the filter element of the filter assembly is completely blocked, the liquid accumulates inside the liquid inlet pipeline, so that the pressure inside the liquid inlet pipeline increases; The increase in the pressure inside the liquid inlet pipeline causes the pressure in the space between the clamping joint and the inner wall of the placement groove to increase; When the pressure in the space between the clamping joint and the inner wall of the placement groove exceeds the threshold value, it will push the pushing surface of the moving part and move the moving part away from the plug. The moving part drives the clamping joint to move, so that the clamping joint is separated from the through hole. The liquid inside the liquid inlet pipeline will return to the inside of the pump through the through hole and the liquid suction port until the pump is turned off or the filter element is replaced, so that the pressure in the space between the clamping joint and the inner wall of the placement groove is lower than the threshold value, and the clamping joint is re-connected with the through hole.

[0025] By adopting the above technical solution, after the filter element of the filter assembly is blocked, the pressure inside the liquid inlet pipeline gradually increases due to the continuous entry of the liquid, resulting in an increase in the pressure inside the placement groove. When it is detected that the pressure exceeds the threshold value, the overflow valve will open the liquid suction port, and the liquid inside the liquid inlet pipeline will return to the pump from the liquid suction port until the pressure in the liquid inlet pipeline does not exceed the threshold value, thus avoiding the continuous increase in the pressure inside the liquid inlet pipeline, causing the contaminants on the surface of the filter element to enter the liquid outlet cavity due to the pressure and enter the system, resulting in the problem of contamination of the liquid used in the system. Therefore, this pressure filter can avoid excessive pressure in the liquid inlet cavity of the pressure filter when the filter holes of the filter element are blocked.

[0026] In summary, the present invention includes at least one of the following beneficial technical effects: 1. Through the design of the placement groove and the overflow valve, after the filter element of the filter assembly is blocked, the pressure inside the liquid inlet pipeline causes the overflow valve to open the liquid suction port, and the liquid inside the liquid inlet pipeline will return to the pump from the liquid suction port. The liquid circulates between the liquid inlet pipeline and the pump, thus avoiding excessive pressure in the liquid inlet cavity of the pressure filter when the filter holes of the filter element are blocked; 2. Through the design of the integrated pipeline, not only can the pipeline structure inside the pressure filter be simplified and the applicability of the pressure filter be improved, but also the inside of the placement groove on one side of the sealing assembly can be communicated with the outside, so that a pressure difference is generated between the inside of the placement grooves on both sides of the sealing assembly, thereby driving the sealing assembly to move and realizing the connection and disconnection between the through hole and the inside of the placement groove. Description of the Drawings

[0027] Figure 1 Structural schematic diagram of the pressure filter according to an embodiment of the present invention; Figure 2 is Figure 1 A - A sectional view of; Figure 3 Structural schematic diagram of the overflow valve according to an embodiment of the present invention; Figure 4 Liquid flow diagram of the pressure filter according to an embodiment of the present invention.

[0028] In the figure: 1 - liquid inlet, 2 - back - suction liquid port, 3 - liquid outlet, 4 - liquid inlet pipeline, 5 - first connection pipeline, 6 - placement groove, 7 - plug, 8 - through - hole, 9 - sealing assembly, 901 - clamping joint, 902 - moving part, 10 - limiting part, 11 - limiting groove, 12 - spring - back assembly, 13 - sealing part. Specific embodiments

[0029] The following further details the embodiments of the present invention with reference to the accompanying drawings.

[0030] The pressure filter in the embodiment of the present invention, referring to Figure 1 、 2 shown, the pressure filter includes a liquid inlet pipeline 4, one end of which is communicated with the liquid inlet 1, and the other end is communicated with the filtering assembly to realize the liquid pressurized by the pump entering the liquid inlet pipeline 4 from the liquid inlet 1; a placement groove 6 is opened inside the pressure filter, and the placement groove 6 is communicated with the liquid inlet pipeline 4 through the first connection pipeline 5, and one end of the placement groove 6 is communicated with the back - suction liquid port 2 of the pressure filter to realize the liquid flowing into the liquid inlet pipeline 4 returning to the pump from the back - suction liquid port 2; an overflow valve is arranged inside the placement groove 6, wherein when the pressure in the liquid inlet pipeline 4 exceeds the threshold value, the overflow valve opens the back - suction liquid port 2; when the pressure in the liquid inlet pipeline 4 does not exceed the threshold value, the overflow valve closes the back - suction liquid port 2.

[0031] It can be seen from this that when the filter element of the filter component of the present invention is not blocked, the liquid pressurized by the pump enters the liquid inlet pipeline 4 from the liquid inlet 1, and then passes through the filter component for filtration and flows into the system; after the filter element of the filter component is blocked, due to the continuous input of liquid into the liquid inlet 1 by the pump, the pressure inside the liquid inlet pipeline 4 gradually increases, resulting in an increase in the pressure inside the placement groove 6. When it is detected that the pressure exceeds the threshold, the overflow valve opens the back suction liquid port 2. Since the suction port of the pump is connected to the back suction liquid port 2 of the pressure filter, the liquid in the liquid inlet pipeline 4 will return to the pump from the back suction liquid port 2 until the pressure in the liquid inlet pipeline 4 does not exceed the threshold, and the overflow valve closes the back suction liquid port 2. This avoids the continuous increase in the pressure inside the liquid inlet pipeline 4, resulting in contaminants on the surface of the filter element entering the liquid outlet cavity due to the pressure and entering the system, thus causing the problem of contamination of the liquid used in the system. Therefore, this pressure filter can avoid excessive pressure in the liquid inlet cavity of the pressure filter when the filter holes of the filter element are blocked.

[0032] Preferably, referring to Figure 2 as shown, a specific structure of the overflow valve is provided: The overflow valve includes a plug 7 and a sealing component 9. The plug 7 is arranged at the end of the placement groove 6, and a through hole 8 is opened inside the plug 7 to connect the inside of the placement groove 6 with the back suction liquid port 2. The sealing component 9 is arranged at one end of the through hole 8 away from the back suction liquid port 2, and the sealing component 9 is movably arranged inside the placement groove 6 to enable the sealing component 9 to connect and disconnect the through hole 8 and the inside of the placement groove 6.

[0033] Specifically, the plug 7 is fixedly arranged at the end of the placement groove 6 close to the back suction liquid port 2 to block the back suction liquid port 2. A through hole 8 is axially penetrated through the plug 7, so as to connect the inside of the placement groove 6 with the back suction liquid port 2; a sealing component 9 is movably arranged inside the placement groove 6. When the sealing component 9 moves along the inner wall direction of the placement groove 6, the sealing component 9 can move close to the plug 7 until one end of the sealing component 9 inserts into the through hole 8 and seals this end. The sealing component 9 can also move away from the plug 7, thereby connecting the inside of the placement groove 6 with the back suction liquid port 2. Therefore, this design only needs to move the sealing component 9 inside the placement groove 6 to realize the conversion between the open and closed states of the overflow valve, and can respond in a timely manner to the change of the pressure inside the liquid inlet pipeline 4.

[0034] Furthermore, referring to Figure 2 、 3 as shown, a specific structure of the sealing component 9 is provided: The sealing assembly 9 includes a clamping joint 901 and a moving member 902. One end of the clamping joint 901 is clamped with the inner wall of the through hole 8, and the other end of the clamping joint 901 is fixedly connected to the moving member 902. The moving member 902 is movably arranged on the inner wall of the placement groove 6, and the surface of the moving member 902 connected to the clamping joint 901 is a pushing surface. The radius of the clamping joint 901 is smaller than the radius of the inner wall of the placement groove 6 to achieve the clamping and separation of the clamping joint 901 and the through hole 8.

[0035] Specifically, the sealing assembly 9 is split into a clamping joint 901 and a moving member 902. One end of the clamping joint 901 is inserted into the inner wall of the through hole 8 and clamped with the inner wall of the through hole 8. The end of the clamping joint 901 can be designed as a cone or a frustum of a cone, that is, a structure with a narrow head and a wide tail. The other end of the clamping joint 901 is fixedly connected to the moving member 902. The radius of the clamping joint 901 is designed to be smaller than the radius of the inner wall of the placement groove 6, and the radius of the moving member 902 is the same as the radius of the inner wall of the placement groove 6. Therefore, part of the surface of one end of the clamping joint 901 is in contact with the moving member 902, and the remaining surface (the part not in contact with the clamping joint 901) of this end is the pushing surface. That is, the liquid in the liquid inlet pipeline 4 will flow into the space between the clamping joint 901 and the placement groove 6, and the water pressure in this space will generate a thrust on the pushing surface, so that the moving member 902 moves along the inner wall of the placement groove 6. The moving member 902 drives the clamping joint 901 to move to achieve the clamping and separation of the clamping joint 901 and the through hole 8. At the same time, by adjusting the area of the pushing surface, it is possible to connect the through hole 8 and the placement groove 6 under different pressure conditions, that is, the threshold for pushing the moving member 902.

[0036] Preferably, as shown in Figure 2 、 3 A sealing member 13 is provided between the outer periphery of the moving member 902 and the inner wall of the placement groove 6 to ensure that the liquid is only located in the space between the sealing assembly 9 and the plug 7.

[0037] Specifically, a sealing member 13 is sleeved on the outer periphery of the moving member 902, or a groove is provided on the moving member 902, and the sealing member 13 is arranged inside the groove, and it is necessary to ensure that the moving member 902 and the inner wall of the placement groove 6 squeeze the sealing member 13 to ensure the sealing performance. Similarly, a sealing member 13 is also provided between the outer periphery of the plug 7 and the inner wall of the placement groove 6. This design prevents the liquid from flowing into the interior of the placement groove 6 through the gap between the outer periphery of the moving member 902 and the inner wall of the placement groove 6, which affects the normal movement of the moving member 902. At the same time, it limits the lateral movement of the moving member 902 (perpendicular to the opening direction of the inner wall of the placement groove 6) to prevent the clamping joint 901 from shifting, resulting in the inability of the clamping joint 901 to be clamped with the through hole 8.

[0038] Preferably, as shown in Figure 2 、 3As shown, a limiting member 10 is fixedly arranged at one end of the moving member 902 away from the clamping joint 901, and the limiting member 10 is used to abut against one end of the placement groove 6 away from the liquid suction port 2.

[0039] Specifically, a limiting member 10 is fixedly arranged at one end of the moving member 902 away from the clamping joint 901. The design orientation of the limiting member 10 is the same as the moving direction of the moving member 902. When the moving member 902 moves towards the inner wall of the placement groove 6, the limiting member 10 is driven to move closer to the inner end of the placement groove 6. A gasket can be arranged at one end of the limiting member 10 away from the moving member 902 to avoid hard collision between the limiting member 10 and the end of the placement groove 6. Therefore, this design avoids excessive movement of the moving member 902. The greater the moving distance, the greater the possibility of deviation, which may cause the clamping joint 901 to fail to be normally clamped with the through hole 8 after the subsequent pressure decreases.

[0040] Furthermore, a limiting groove 11 is opened at one end of the placement groove 6 away from the liquid suction port 2, and one end of the limiting member 10 away from the clamping joint 901 is inserted into the inside of the limiting groove 11.

[0041] Specifically, a limiting groove 11 is opened at one end of the placement groove 6 away from the liquid suction port 2. The limiting member 10 that originally abutted against the end of the placement groove 6 is inserted into the inside of the limiting groove 11, so that the limiting member 10 can telescopically move along the inner wall of the limiting groove 11, and no matter how the moving member 902 moves, one end of the limiting member 10 is always located inside the limiting groove 11. Therefore, the limiting groove 11 not only plays a limiting role but also plays a guiding role for the limiting member 10. Because the limiting member 10 telescopically moves along the inner wall of the limiting groove 11, the limiting member 10 will not move horizontally in the limiting groove 11, thereby further restricting the horizontal movement of the moving member 902.

[0042] Preferably, as shown in Figure 2 As shown, a spring-back assembly 12 is arranged between the moving member 902 and one end of the placement groove 6 away from the liquid suction port 2, and the spring-back assembly 12 is sleeved on the limiting member 10.

[0043] Specifically, a resilient component 12 is sleeved on the limiting member 10. The resilient component 12 can be a spring, a soft collar, etc. One end of the resilient component 12 abuts against the end of the placement groove 6, and the other end of the resilient component 12 abuts against the moving member 902. After the moving member 902 moves towards the end of the placement groove 6 away from the liquid suction port 2, the resilient component 12 will be compressed. Since the placement groove 6 is stationary, a force is generated to make the moving member 902 return to its initial position. When the pressure pushing the moving member 902 is less than the threshold value, the resilient force pushes the moving member 902 back to its initial position, that is, the clamping head 901 and the through hole 8 are in a clamped state; at the same time, the resilient force of the resilient component 12 enhances the clamping stability between the clamping head 901 and the through hole 8 (when the clamping head 901 and the through hole 8 are in a clamped state, the resilient component 12 is also in a compressed state); at the same time, sleeving the resilient component 12 on the limiting member 10 avoids the bending of the resilient component 12 during compression, resulting in the deviation of the resilient force direction.

[0044] Preferably, referring to Figure 1 、 2 As shown, an integrated pipeline is connected to the filtration component. A number of liquid outlet pipelines are arranged on the integrated pipeline. One end of the liquid outlet pipeline is communicated with the inside of the integrated pipeline, and the other end of the liquid outlet pipeline is communicated with the liquid outlet 3, so as to realize that the liquid filtered by the filtration component flows out through the liquid outlet 3.

[0045] Specifically, the filtration component is located in the lower half of the pressure filter. One end of the liquid inlet pipeline 4 away from the liquid inlet 1 is connected to the input end of the filtration component. An integrated pipeline is arranged at the output end of the filtration component. The filtered liquid flows into the inside of the integrated pipeline, and one or more liquid outlet pipelines are communicated on the integrated pipeline. The liquid outlet pipeline is communicated with the liquid outlet 3 of the pressure filter. The filtered liquid can be concentrated inside the integrated pipeline, and then the number of the liquid outlet pipelines and the liquid outlet 3 can be designed according to actual needs, so as to improve the applicability of the pressure filter; at the same time, the integrated pipeline can simplify the pipeline structure inside the pressure filter and facilitate the maintenance of the internal structure of the pressure filter.

[0046] Further, referring to Figure 2 As shown, a second connection pipeline is arranged between the integrated pipeline and the placement groove 6. One end of the second connection pipeline is communicated with the inside of the integrated pipeline, and the other end of the second connection pipeline is communicated with the inside of the placement groove 6, so as to realize the formation of a pressure difference between the first connection pipeline 5 and the second connection pipeline.

[0047] Specifically, the moving member 902 divides a part of the placement groove 6 into a first space and a second space. Among them, the plug 7 is located in the first space, and the limiting member 10 is located in the second space. Since the liquid in the liquid inlet pipeline 4 will flow into the first space through the first connecting pipeline 5, the pressure inside the first space gradually increases. The second space is communicated with the integrated pipeline through the second connecting pipeline, and the integrated pipeline is communicated with the outside through the liquid outlet pipeline. Therefore, the pressure inside the second space is the atmospheric pressure. Therefore, a pressure difference is generated between the first space and the second space. Since the pressure in the first space is greater, when the pressure exceeds the threshold value, it will push the moving member 902 to move towards the second space, thereby realizing the communication between the through hole 8 and the inside of the placement groove 6, and the liquid in the first space will flow out from the through hole 8.

[0048] For the usage method of the pressure filter in the embodiment of the present invention, see Figure 4 as shown, which includes the following steps: The liquid pressurized by the pump enters the inside of the liquid inlet pipeline 4 from the liquid inlet 1; If the filter element of the filter assembly is not completely blocked, the liquid is filtered through the filter assembly; The filtered liquid flows into the integrated pipeline and passes through the liquid outlet pipeline, and finally flows from the liquid outlet 3 to the system; If the filter element of the filter assembly is completely blocked, the liquid accumulates inside the liquid inlet pipeline 4, so that the pressure inside the liquid inlet pipeline 4 increases; The increase in the pressure inside the liquid inlet pipeline 4 causes the pressure in the space between the clamping joint 901 and the inner wall of the placement groove 6 to increase; When the pressure in the space between the clamping joint 901 and the inner wall of the placement groove 6 exceeds the threshold value, it will push the pushing surface of the moving member 902 and make the moving member 902 move away from the plug 7. The moving member 902 drives the clamping joint 901 to move, so that the clamping joint 901 is separated from the through hole 8, and the liquid inside the liquid inlet pipeline 4 will return to the inside of the pump through the through hole 8 and the liquid suction port 2 until the pump is turned off or the filter element is replaced, so that the pressure in the space between the clamping joint 901 and the inner wall of the placement groove 6 is lower than the threshold value, and the clamping joint 901 is re-connected with the through hole 8.

[0049] The above are only specific implementation manners of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A pressure filter, characterized in that, It includes: A liquid inlet pipeline (4), one end of which is communicated with the liquid inlet (1), and the other end of which is communicated with the filtering component, so as to realize that the liquid pressurized by the pump enters the liquid inlet pipeline (4) from the liquid inlet (1); A placement groove (6) is formed inside the pressure filter, and the placement groove (6) is communicated with the liquid inlet pipeline (4) through the first connecting pipeline (5). One end of the placement groove (6) is communicated with the liquid back suction port (2) of the pressure filter, so as to realize that the liquid flowing into the liquid inlet pipeline (4) returns to the pump from the liquid back suction port (2); A relief valve is arranged inside the placement groove (6); Wherein, when the pressure in the liquid inlet pipeline (4) exceeds the threshold value, the relief valve opens the liquid back suction port (2); when the pressure in the liquid inlet pipeline (4) does not exceed the threshold value, the relief valve closes the liquid back suction port (2).

2. The pressure filter according to claim 1, wherein: The relief valve includes a plug (7) and a sealing component (9). The plug (7) is arranged at the end of the placement groove (6), and a through hole (8) is formed inside the plug (7) to realize the communication between the inside of the placement groove (6) and the liquid back suction port (2). The sealing component (9) is arranged at one end of the through hole (8) far from the liquid back suction port (2), and the sealing component (9) is movably arranged inside the placement groove (6) to realize the communication and disconnection between the through hole (8) and the inside of the placement groove (6) by the sealing component (9).

3. The pressure filter according to claim 2, characterized in that: The sealing component (9) includes a clamping joint (901) and a moving part (902). One end of the clamping joint (901) is clamped with the inner wall of the through hole (8), and the other end of the clamping joint (901) is fixedly connected with the moving part (902). The moving part (902) is movably arranged on the inner wall of the placement groove (6), and the surface of the moving part (902) connected with the clamping joint (901) is a pushing surface. The radius of the clamping joint (901) is smaller than the radius of the inner wall of the placement groove (6) to realize the clamping and separation of the clamping joint (901) and the through hole (8).

4. The pressure filter according to claim 3, characterized in that: A sealing element (13) is arranged between the periphery of the moving part (902) and the inner wall of the placement groove (6) to realize that the liquid is only located in the space between the sealing component (9) and the plug (7).

5. The pressure filter according to claim 3, wherein: A limiting part (10) is fixedly arranged at one end of the moving part (902) far from the clamping joint (901), and the limiting part (10) is used for abutting against one end of the placement groove (6) far from the liquid back suction port (2).

6. The pressure filter according to claim 5, characterized in that: A limiting groove (11) is formed at one end of the placement groove (6) far from the liquid back suction port (2), and one end of the limiting part (10) far from the clamping joint (901) is inserted into the inside of the limiting groove (11).

7. The pressure filter according to claim 5, characterized in that: A resilient component (12) is arranged between the moving part (902) and one end of the placement groove (6) far from the liquid back suction port (2), and the resilient component (12) is sleeved on the limiting part (10).

8. The pressure filter according to claim 2, characterized in that: An integrated pipeline is connected to the filtering component. A plurality of liquid outlet pipelines are arranged on the integrated pipeline. One end of the liquid outlet pipeline is communicated with the inside of the integrated pipeline, and the other end of the liquid outlet pipeline is communicated with the liquid outlet (3) to realize that the liquid filtered by the filtering component flows out through the liquid outlet (3).

9. The pressure filter according to claim 8, characterized in that: A second connecting pipeline is provided between the integrated pipeline and the placement groove (6). One end of the second connecting pipeline communicates with the inside of the integrated pipeline, and the other end of the second connecting pipeline communicates with the inside of the placement groove (6) to form a pressure difference between the first connecting pipeline (5) and the second connecting pipeline.

10. A method for using a pressure filter according to any one of claims 1-9, characterized in that, It includes the following steps: The liquid pressurized by the pump enters the inside of the liquid inlet pipeline (4) from the liquid inlet (1); If the filter element of the filter assembly is not completely blocked, the liquid is filtered through the filter assembly; The filtered liquid flows into the integrated pipeline, passes through the liquid outlet pipeline, and finally flows from the liquid outlet (3) to the system; If the filter element of the filter assembly is completely blocked, the liquid accumulates inside the liquid inlet pipeline (4) to increase the pressure inside the liquid inlet pipeline (4); The increase in the pressure inside the liquid inlet pipeline (4) causes the pressure in the space between the clamping joint (901) and the inner wall of the placement groove (6) to increase; When the pressure in the space between the clamping joint (901) and the inner wall of the placement groove (6) exceeds the threshold value, it will push the pushing surface of the moving part (902) and cause the moving part (902) to move away from the plug (7). The moving part (902) drives the clamping joint (901) to move, so that the clamping joint (901) is separated from the through hole (8). The liquid inside the liquid inlet pipeline (4) will return to the inside of the pump through the through hole (8) and the liquid suction port (2) until the pump is turned off or the filter element is replaced, so that the pressure in the space between the clamping joint (901) and the inner wall of the placement groove (6) is lower than the threshold value, and the clamping joint (901) is re-connected to the through hole (8).

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