A PPRY type pre-filter

Abstract

The present invention belongs to the technical field of filters, and specifically discloses a PPRY type pre-filter, which includes a connecting pipe and a shunt pipe. The shunt pipe is connected to the surface of the connecting pipe and is inclined. The other end of the shunt pipe is provided with a drain pipe. A controller is arranged on the surface of the shunt pipe. A filtering mechanism is arranged inside the shunt pipe. An installation pipe is fixedly connected inside the drain pipe. A notch is formed on the surface of the installation pipe. The filtering mechanism includes a pressure regulating component and a filtering component arranged inside the installation pipe. By setting the pressure regulating component, the effect of adapting to the water pressure can be achieved, ensuring uniform flow velocity so that it can make good use of the filtering component for filtering, improving the filtering effect. When the pressure is too high, the flow cross-section can be increased to reduce the water pressure, avoiding damage caused by excessive water pressure. When the pressure is relatively low, the flow cross-section can be reduced to increase the water pressure, ensuring uniform flow velocity and improving the subsequent filtering effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of filters, and specifically discloses a PPRY type pre-filter. Background Art

[0002] The Y-type pre-filter, also known as a dirt remover and a filter valve, is an indispensable device at the inlet end of a pipeline system for transporting media. Its function is to filter mechanical impurities in the media, and it can filter rust, sand grains in sewage, and a small amount of solid particles in liquids, etc., to protect the fittings on the equipment pipeline from wear and blockage, and can protect the normal operation of the equipment. However, in the existing Y-type pre-filter, after a long time of use, there are more impurities adhered to the filter surface of the internal filter screen, which requires manual cleaning. And due to too many adhered impurities, it affects the flow of water through, easily causing the water pressure to rise and resulting in damage to the pipeline. Summary of the Invention

[0003] In view of this, the technical problem to be solved by the present invention is to propose a PPRY type pre-filter to solve the problem that after long-term use in the prior art, too many adhered impurities affect the flow of water through, easily causing the water pressure to rise and resulting in damage to the pipeline.

[0004] To achieve the above object, the present invention provides a PPRY type pre-filter, including a connecting pipe and a shunt pipe. The shunt pipe is communicated with the surface of the connecting pipe and is inclined. The other end of the shunt pipe is provided with a drain pipe. A controller is arranged on the surface of the shunt pipe. A filtering mechanism is arranged inside the shunt pipe. An installation pipe is fixedly connected inside the drain pipe, and a notch is formed on the surface of the installation pipe.

[0005] The filtering mechanism includes a pressure regulating component and a filtering component arranged inside the installation pipe. The pressure regulating component can introduce water into the filtering component for filtering.

[0006] In the above technical solution, preferably, the pressure regulating component includes an installation ring fixedly connected to the inner wall of the installation pipe. A mounting cylinder is fixedly connected to the side of the installation ring close to the drain pipe. A filter frame is fixedly connected to the inner wall of the mounting cylinder. An adjusting bladder is arranged inside the filter frame. A discharge area is formed between the outer side of the mounting cylinder and the inner wall of the installation pipe.

[0007] In the above technical solution, preferably, a connecting cylinder is fixedly connected to the surface of the installation pipe. The other end of the connecting cylinder penetrates out of the shunt pipe. An adjusting cavity is formed inside the connecting cylinder. A pressure regulating plate is slidably connected to the inner wall of the adjusting cavity. Hydraulic oil is filled between the side of the pressure regulating plate close to the installation pipe and the inside of the adjusting cavity. One end of the connecting cylinder is provided with a conduit communicated with the adjusting cavity, and the other end of the conduit is communicated with the adjusting bladder.

[0008] In the above technical solution, preferably, an installation block is fixedly connected to the inner wall of the adjustment cavity, a pressure sensor is embedded and installed on the side of the installation block close to the adjustment plate, a buffer plate is arranged on the surface of the adjustment plate, one side of the buffer plate is in contact with the surface of the pressure sensor, and a spring is fixedly connected between the other side of the buffer plate and the adjustment plate.

[0009] In the above technical solution, preferably, the filtering assembly includes a partition ring fixedly connected to the inner wall of the installation pipe, the top of the partition ring is fixedly connected to the bottom of the installation cylinder, through grooves communicating with the discharge area are formed on the surface of the partition ring, the inner side of the partition ring communicates with the installation cylinder, a rotating ring is rotatably connected to the bottom of the partition ring, and connection grooves corresponding to the through grooves are formed on the surface of the rotating ring.

[0010] In the above technical solution, preferably, a fixing plate located on the side of the partition ring away from the installation cylinder is fixedly connected to the inner wall of the installation pipe, one end of the drain pipe is fixedly connected to the surface of the fixing plate, and two symmetrically distributed drain holes are formed in the surface of the fixing plate and communicate with the drain pipe. A fixing ring is fixedly connected to the side of the fixing plate close to the partition ring, the inner side of the fixing ring communicates with the inner side of the rotating ring, and two symmetrically distributed first filter meshes are embedded and installed on the surface of the fixing ring. Two second filter meshes staggered with the first filter meshes are embedded and installed on the surface of the fixing ring.

[0011] In the above technical solution, preferably, two symmetrically distributed connection shells are arranged on the surface of the fixing ring, the upper ends of the connection shells are fixedly connected to the top of the rotating ring, the bottoms of the connection shells are in contact with the top of the fixing plate, a communication area is formed between the inner sides of the connection shells and the surface of the fixing ring, a partition plate is fixedly connected to the inner side of the connection shell, through holes evenly distributed are formed in the surface of the partition plate, and one-way valves are arranged inside the through holes.

[0012] In the above technical solution, preferably, a motor is arranged inside the fixing plate, a rotating shaft is fixedly connected to the output shaft of the motor, the upper end of the rotating shaft penetrates out of the fixing plate and extends into the fixing ring, four annularly distributed mounting plates are fixedly connected to the surface of the rotating shaft, a partition area is formed between two adjacent mounting plates, the inner sides of the mounting plates are in contact with the inner wall of the fixing ring, first baffles are fixedly connected to the inner walls of two symmetrically arranged partition areas, the outer sides of the first baffles are fixedly connected to the inner side of the rotating ring, second baffles are fixedly connected to the inner walls of the other two symmetrically arranged partition areas, the bottoms of the second baffles are in contact with the surface of the fixing plate, and connection holes are formed in the surface of the mounting plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. By setting the pressure regulating component, the effect of adapting to the water pressure can be achieved, ensuring uniform flow rate so that the filtering component can be well utilized for filtration, improving the filtration effect. When the pressure is too high, the flow cross-section can be increased to reduce the water pressure, avoiding damage caused by excessive water pressure. When the pressure is relatively low, the flow cross-section can be reduced to increase the water pressure, ensuring uniform flow rate and improving the subsequent filtration effect.

[0015] 2. By setting the filtering component, the motor can be started to drive the rotating shaft to rotate, adjusting the positions of the second baffle and the first baffle so that the water filtered by the second filter screen can pass through the partition plate and then backwash the first filter screen in the reverse direction. The setting of the check valve can ensure that the water will not flow from the first filter screen along the communication area towards the second filter screen, ensuring a good backwashing effect, and the impurities flushed can be discharged through the drain hole along with the water flow.

[0016] 3. By setting the filtering mechanism, under the action of the filtering mechanism, when the pressure sensor can detect the pressure, when the pressure is greater than the threshold value, the signal will be transmitted to the controller. Then, after the controller receives the overpressure signal transmitted by the pressure sensor, it can actively start the motor to drive the rotating shaft to rotate, achieving the purpose of directly discharging the water flow through the drain pipe, avoiding damage to the pipeline caused by overpressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is a schematic sectional view of the present invention;

[0019] Figure 3 is a schematic connection diagram of the filtering mechanism and the installation pipe of the present invention;

[0020] Figure 4 is a schematic structural diagram of the pressure regulating component of the present invention;

[0021] Figure 5 is a schematic distribution diagram of the through groove and the connection groove of the present invention;

[0022] Figure 6 is a schematic distribution diagram of the first filter screen and the second filter screen of the present invention;

[0023] Figure 7 is a schematic connection diagram of the connection shell and the partition plate of the present invention;

[0024] Figure 8 is a schematic distribution diagram of the mounting plate of the present invention.

[0025] In the figure: 1, connecting pipe; 101, shunt pipe; 102, drain pipe; 103, installation pipe; 104, notch; 2, controller; 3, filtering mechanism; 31, pressure regulating component; 3101, mounting ring; 3102, mounting cylinder; 3103, filter frame; 3104, regulating bladder; 3105, conduit; 3106, regulating plate; 3107, mounting block; 3108, connecting cylinder; 3109, pressure sensor; 3110, buffer plate; 3111, spring; 3112, regulating cavity; 32, filtering component; 3201, separating ring; 3202, through slot; 3203, connecting slot; 3204, fixing plate; 3205, first baffle; 3206, rotating ring; 3207, first filter screen; 3208, motor; 3209, connecting shell; 3210, separating plate; 3211, check valve; 3212, fixing ring; 3213, second filter screen; 3214, mounting plate; 3215, drain hole; 3216, second baffle; 3217, rotating shaft. Detailed implementation manners

[0026] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0027] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0028] As Figures 1 - 8 shown, a PPRY type pre-filter includes a connecting pipe 1 and a shunt pipe 101. The shunt pipe 101 communicates with the surface of the connecting pipe 1 and is inclined. The other end of the shunt pipe 101 is provided with a drain pipe 102. A controller 2 is provided on the surface of the shunt pipe 101. A filtering mechanism 3 is provided inside the shunt pipe 101. An installation pipe 103 is fixedly connected inside the drain pipe 102. A notch 104 is formed on the surface of the installation pipe 103.

[0029] The filtering mechanism 3 includes a pressure regulating component 31 and a filtering component 32 provided inside the installation pipe 103. The pressure regulating component 31 can introduce water into the filtering component 32 for filtering.

[0030] As Figures 1 - 8 shown, the pressure regulating component 31 includes a mounting ring 3101 fixedly connected to the inner wall of the installation pipe 103. A mounting cylinder 3102 is fixedly connected to the side of the mounting ring 3101 close to the drain pipe 102. A filter frame 3103 is fixedly connected to the inner wall of the mounting cylinder 3102. A regulating bladder 3104 is arranged inside the filter frame 3103. A discharge area is formed between the outer side of the mounting cylinder 3102 and the inner wall of the installation pipe 103.

[0031] The surface of the installation pipe 103 is fixedly connected with a connecting cylinder 3108. The other end of the connecting cylinder 3108 penetrates out of the shunt pipe 101. An adjustment cavity 3112 is formed inside the connecting cylinder 3108. A pressure regulating plate 3106 is slidably connected to the inner wall of the adjustment cavity 3112. Hydraulic oil is filled between the side of the pressure regulating plate 3106 close to the installation pipe 103 and the inside of the adjustment cavity 3112. One end of the connecting cylinder 3108 is provided with a conduit 3105 communicating with the adjustment cavity 3112, and the other end of the conduit 3105 communicates with the adjustment bladder 3104.

[0032] An installation block 3107 is fixedly connected to the inner wall of the adjustment cavity 3112. A pressure sensor 3109 is embedded and installed on the side of the installation block 3107 close to the pressure regulating plate 3106. A buffer plate 3110 is arranged on the surface of the pressure regulating plate 3106. One side of the buffer plate 3110 is in contact with the surface of the pressure sensor 3109, and a spring 3111 is fixedly connected between the other side of the buffer plate 3110 and the pressure regulating plate 3106.

[0033] Water enters from Figure 1 After entering from the right side, it can enter the inside of the installation cylinder 3102 through the inside of the installation ring 3101. During this process, the setting of the filter frame 3103 can prevent the impurities in the water from rubbing against the surface of the adjustment bladder 3104 and causing damage to the adjustment bladder 3104.

[0034] After the water flow enters the inside of the installation ring 3101, the adjustment bladder 3104 can be pressurized by the water pressure. When the water pressure is too high, the hydraulic oil inside the adjustment bladder 3104 can be squeezed to be injected into the inside of the adjustment cavity 3112 through the conduit 3105. During this process, the injected hydraulic oil can be used to push the pressure regulating plate 3106 to move towards the buffer plate 3110, and at the same time compress the spring 3111 (the spring 3111 in the normal state is used to maintain the position of the pressure regulating plate 3106, so as to maintain the volume of the adjustment bladder 3104 under the normal water pressure). At the same time, after the spring 3111 is compressed, it can exert pressure on the buffer plate 3110. During this process, the pressure sensor 3109 can detect the pressure. When the pressure is greater than the threshold value, a signal is transmitted to the controller 2. At the same time, due to the contraction of the adjustment bladder 3104, the internal space of the installation cylinder 3102 can be increased, achieving the effect of increasing the flow cross-section and reducing the water pressure, and avoiding damage caused by too high water pressure.

[0035] When the water pressure is too low, the adjustment bladder 3104 is less pressurized. At this time, under the action of the spring 3111, the pressure regulating plate 3106 can be pushed towards the direction of the adjustment bladder 3104, so as to push the hydraulic fluid stored inside the adjustment cavity 3112 to be injected through the conduit 3105, thereby increasing the volume of the adjustment bladder 3104 (such as Figure 4As shown, the adjustment bladder 3104 (maximum volume) reduces the flow cross-section to increase the water pressure, thereby achieving the effect of self-adaptive water pressure, ensuring uniform flow rate so that it can make good use of the filter assembly 32 for filtration and improving the filtration effect.

[0036] As Figures 1 - 8 shown, the filter assembly 32 includes a partition ring 3201 fixedly connected to the inner wall of the installation pipe 103. The top of the partition ring 3201 is fixedly connected to the bottom of the installation cylinder 3102. A through groove 3202 communicating with the discharge area is formed on the surface of the partition ring 3201. The inner side of the partition ring 3201 communicates with the installation cylinder 3102. A rotating ring 3206 is rotatably connected to the bottom of the partition ring 3201. A connection groove 3203 corresponding to the through groove 3202 is formed on the surface of the rotating ring 3206.

[0037] A fixing plate 3204 is fixedly connected to the inner wall of the installation pipe 103 on the side away from the installation cylinder 3102 of the partition ring 3201. One end of the drain pipe 102 is fixedly connected to the surface of the fixing plate 3204. Two symmetrically distributed drain holes 3215 are formed on the surface of the fixing plate 3204. The drain holes 3215 communicate with the drain pipe 102. A fixing ring 3212 is fixedly connected to the side of the fixing plate 3204 close to the partition ring 3201. The inner side of the fixing ring 3212 communicates with the inner side of the rotating ring 3206. Two symmetrically distributed first filter meshes 3207 are embedded on the surface of the fixing ring 3212. Two second filter meshes 3213 are embedded on the surface of the fixing ring 3212 and are staggered with the first filter meshes 3207.

[0038] Two symmetrically distributed connection shells 3209 are arranged on the surface of the fixing ring 3212. The upper end of the connection shell 3209 is fixedly connected to the top of the rotating ring 3206. The bottom of the connection shell 3209 is in contact with the top of the fixing plate 3204. A communication area is formed between the inner side of the connection shell 3209 and the surface of the fixing ring 3212. A partition plate 3210 is fixedly connected to the inner side of the connection shell 3209. Uniformly distributed through holes are formed on the surface of the partition plate 3210. Check valves 3211 are arranged inside the through holes.

[0039] Inside the fixing plate 3204, there is a motor 3208. The output shaft of the motor 3208 is fixedly connected to a rotating shaft 3217. The upper end of the rotating shaft 3217 penetrates through the fixing plate 3204 and extends into the inside of the fixing ring 3212. On the surface of the rotating shaft 3217, there are four mounting plates 3214 fixedly connected and distributed in a ring shape. A partition area is formed between two adjacent mounting plates 3214. The inner side of the mounting plate 3214 is in contact with the inner wall of the fixing ring 3212. The inner walls of two symmetrically arranged partition areas are both fixedly connected with a first baffle 3205. The outer side of the first baffle 3205 is fixedly connected to the inner side of the rotating ring 3206. The inner walls of the other two symmetrically arranged partition areas are both fixedly connected with a second baffle 3216. The bottom of the second baffle 3216 is in contact with the surface of the fixing plate 3204. Connection holes are formed on the surface of the mounting plate 3214.

[0040] The water passing through the mounting cylinder 3102 can enter the inside of the fixing ring 3212. The setting of the connection holes can ensure that the water normally passes through the mounting plate 3214 and flows in each partition area. After passing through the first filter screen 3207 and the second filter screen 3213, the sundries are intercepted inside the fixing ring 3212, and are introduced and discharged through the connection groove 3203 and the through groove 3202 and finally discharged through the notch 104. However, due to the setting of the connection shell 3209, the water passing through the second filter screen 3213 cannot be discharged, so it will not cause too much filtering burden on the second filter screen 3213. Instead, the first filter screen 3207 will bear more filtering burden. With the long-term filtering, it is necessary to regularly filter the first filter screen 3207 and the second filter screen 3213. By starting the motor 3208, the rotating shaft 3217 can be driven to rotate. During this process, the rotating shaft 3217 can be used to drive the mounting plate 3214 to move synchronously and adjust the positions of the first baffle 3205 and the second baffle 3216. The setting of the first baffle 3205 is used to drive the movement of the rotating ring 3206 synchronously. Under normal conditions, the second baffle 3216 blocks the liquid discharge hole 3215, and the connection groove 3203 and the through groove 3202 are communicated. When the motor 3208 is started, with the adjustment of the positions of the second baffle 3216 and the first baffle 3205, the connection groove 3203 can be misaligned with the through groove 3202, and at the same time, the liquid discharge hole 3215 is no longer blocked. And during the rotation of the mounting plate 3214, the inner sides of the first filter screen 3207 and the second filter screen 3213 can be cleaned. At the same time, since the connection shell 3209 can rotate synchronously with the rotating ring 3206, the water filtered by the second filter screen 3213 can pass through the partition plate 3210 and backwash the first filter screen 3207 in the reverse direction. The setting of the one-way valve 3211 can ensure that the water does not flow from the first filter screen 3207 along the communication area towards the second filter screen 3213, ensuring a good backwashing effect. And the impurities washed can be discharged through the liquid discharge hole 3215 along with the water flow. After 10 minutes of flushing, the motor 3208 drives the rotating shaft 3217 to rotate back to its original position for normal water flow;

[0041] After the controller 2 receives the overpressure signal transmitted by the pressure sensor 3109, it can actively start the motor 3208 to drive the rotation of the rotating shaft 3217, so as to directly discharge the water flow through the drain pipe 102, avoiding damage to the pipeline caused by overpressure.

[0042] Working principle: After the water flow enters the inside of the mounting ring 3101, it can exert pressure on the adjusting bladder 3104 through the water pressure. Due to the contraction of the adjusting bladder 3104, the internal space of the mounting cylinder 3102 can be increased, achieving the effect of increasing the flow cross-section and reducing the water pressure, avoiding damage caused by excessive water pressure. When the pressure is greater than the threshold, a signal is transmitted to the controller 2. When the water pressure is too small, the adjusting bladder 3104 is less pressured. At this time, under the action of the spring 3111, the pressure regulating plate 3106 can be pushed towards the adjusting bladder 3104, thereby pushing the hydraulic fluid stored in the regulating cavity 3112 into the adjusting bladder 3104 through the conduit 3105, increasing the volume of the adjusting bladder 3104 (as Figure 4 shown as the maximum volume of the adjusting bladder 3104), reducing the flow cross-section and increasing the water pressure, so as to achieve the effect of self-adaptive water pressure, ensuring uniform flow velocity and enabling good utilization of the filtering component 32 for filtering, improving the filtering effect. After long-term filtering, by starting the motor 3208, the rotating shaft 3217 can be driven to rotate, adjusting the positions of the second baffle 3216 and the first baffle 3205, enabling the connection groove 3203 to be misaligned with the through groove 3202, and at the same time no longer blocking the drain hole 3215. During the rotation of the mounting plate 3214, the inner sides of the first filter screen 3207 and the second filter screen 3213 can be cleaned. At the same time, since the connection shell 3209 can rotate synchronously with the rotating ring 3206, the water filtered by the second filter screen 3213 can pass through the partition plate 3210 and backwash the first filter screen 3207 in the reverse direction. The setting of the one-way valve 3211 can ensure that water does not flow from the first filter screen 3207 along the communication area towards the second filter screen 3213, ensuring a good backwashing effect. The impurities washed can be discharged through the drain hole 3215 along with the water flow. After 10 minutes of flushing, the motor 3208 drives the rotating shaft 3217 to rotate and reset, and normal water flow occurs.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A PPRY type pre-filter, comprising a connecting pipe (1) and a shunt pipe (101), characterized in that, The shunt pipe (101) is connected to the surface of the connecting pipe (1) and is inclined. The other end of the shunt pipe (101) is provided with a drain pipe (102). A controller (2) is arranged on the surface of the shunt pipe (101). A filtering mechanism (3) is arranged inside the shunt pipe (101). An installation pipe (103) is fixedly connected inside the drain pipe (102), and a notch (104) is formed on the surface of the installation pipe (103). The filtering mechanism (3) includes a pressure regulating component (including a pressure regulating component (31) and a filtering component (32) arranged inside the installation pipe (103). The pressure regulating component (31) can introduce water into the filtering component (32) for filtering; The pressure regulating component (31) includes a mounting ring (3101) fixedly connected to the inner wall of the installation pipe (103). A mounting cylinder (3102) is fixedly connected to the side of the mounting ring (3101) close to the drain pipe (102). A filtering frame (3103) is fixedly connected to the inner wall of the mounting cylinder (3102). An adjusting bladder (3104) is arranged inside the filtering frame (3103). A discharge area is formed between the outer side of the mounting cylinder (3102) and the inner wall of the installation pipe (103); The filtering component (32) includes a partition ring (3201) fixedly connected to the inner wall of the installation pipe (103). The top of the partition ring (3201) is fixedly connected to the bottom of the mounting cylinder (3102). A through groove (3202) communicating with the discharge area is formed on the surface of the partition ring (3201). The inner side of the partition ring (3201) is communicated with the mounting cylinder (3102). A rotating ring (3206) is rotatably connected to the bottom of the partition ring (3201). A connecting groove (3203) corresponding to the through groove (3202) is formed on the surface of the rotating ring (3206); A fixing plate (3204) is fixedly connected to the inner wall of the installation pipe (103) on the side away from the mounting cylinder (3102). One end of the drain pipe (102) is fixedly connected to the surface of the fixing plate (3204). Two symmetrically distributed drain holes (3215) are formed on the surface of the fixing plate (3204), and the drain holes (3215) are communicated with the drain pipe (102). A fixing ring (3212) is fixedly connected to the side of the fixing plate (3204) close to the partition ring (3201). The inner side of the fixing ring (3212) is communicated with the inner side of the rotating ring (3206). Two symmetrically distributed first filter meshes (3207) are embedded on the surface of the fixing ring (3212). Two second filter meshes (3213) which are staggeredly distributed with the first filter meshes (3207) are embedded on the surface of the fixing ring (3212).

2. The PPRY type pre-filter according to claim 1, characterized in that, The surface of the installation pipe (103) is fixedly connected with a connecting cylinder (3108). The other end of the connecting cylinder (3108) penetrates out of the shunt pipe (101). An adjusting cavity (3112) is formed inside the connecting cylinder (3108). A pressure adjusting plate (3106) is slidably connected to the inner wall of the adjusting cavity (3112). Hydraulic oil is filled between the side of the pressure adjusting plate (3106) close to the installation pipe (103) and the inside of the adjusting cavity (3112). One end of the connecting cylinder (3108) is provided with a conduit (3105) communicating with the adjusting cavity (3112). The other end of the conduit (3105) is communicated with the adjusting bladder (3104).

3. The PPRY type pre-filter according to claim 2, characterized in that, An installation block (3107) is fixedly connected to the inner wall of the adjusting cavity (3112). A pressure sensor (3109) is embedded on the side of the installation block (3107) close to the pressure adjusting plate (3106). A buffer plate (3110) is arranged on the surface of the pressure adjusting plate (3106). One side of the buffer plate (3110) is in contact with the surface of the pressure sensor (3109). A spring (3111) is fixedly connected between the other side of the buffer plate (3110) and the pressure adjusting plate (3106).

4. A PPRY type pre-filter according to claim 1, characterized in that, Two symmetrically distributed connecting shells (3209) are arranged on the surface of the fixed ring (3212). The upper end of the connecting shell (3209) is fixedly connected to the top of the rotating ring (3206). The bottom of the connecting shell (3209) is in contact with the top of the fixed plate (3204). A communication area is formed between the inner side of the connecting shell (3209) and the surface of the fixed ring (3212). A partition plate (3210) is fixedly connected to the inner side of the connecting shell (3209). Uniformly distributed through holes are formed on the surface of the partition plate (3210). Check valves (3211) are arranged inside the through holes.

5. A PPRY type pre-filter according to claim 4, characterized in that, A motor (3208) is arranged inside the fixed plate (3204). The output shaft of the motor (3208) is fixedly connected with a rotating shaft (3217). The upper end of the rotating shaft (3217) penetrates out of the fixed plate (3204) and extends into the inside of the fixed ring (3212). Four annularly distributed mounting plates (3214) are fixedly connected to the surface of the rotating shaft (3217). A partition area is formed between two adjacent mounting plates (3214). The inner side of the mounting plate (3214) is in contact with the inner wall of the fixed ring (3212). First baffles (3205) are fixedly connected to the inner walls of two symmetrically arranged partition areas. The outer side of the first baffle (3205) is fixedly connected to the inner side of the rotating ring (3206). Second baffles (3216) are fixedly connected to the inner walls of the other two symmetrically arranged partition areas. The bottom of the second baffle (3216) is in contact with the surface of the fixed plate (3204). Connecting holes are formed on the surface of the mounting plate (3214).

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