A filter for a sliding vane pump

Abstract

The present invention provides a filter for a sliding vane pump, belonging to the technical field of auxiliary equipment for sliding vane pumps. It solves the problems of poor separation effect of gas phase and liquid phase and inconvenient use of existing filters. The filter for the sliding vane pump includes a lower housing and an upper housing. An intake pipe is provided on the lower housing, and the intake pipe extends into the lower housing and forms a liquid accumulation pool between the intake pipe and the lower housing. An exhaust pipe is provided on the upper housing. The upper housing and the lower housing are oppositely connected to form a cavity for gas-liquid filtration and separation. The intake pipe and the exhaust pipe are communicated through the cavity. A filter element is provided on the intake pipe in the cavity between the intake pipe and the exhaust pipe. A centrifugal guiding device for annular air flow is provided between the filter element and the lower housing. A flow resistance guiding device is also provided between the filter element and the lower housing above the centrifugal guiding device. The present invention separates gas and liquid to achieve the purpose of filtration, has a good filtration effect, stable structure and convenient use.

Description

Technical Field

[0001] The invention belongs to the technical field of supporting equipment for a sliding valve pump and relates to a filter for a sliding valve pump. Background Art

[0002] The sliding valve pump has a significant energy-saving effect, high vacuum degree, and large air extraction volume in the high vacuum range. It can be widely used in the vacuum impregnation and vacuum drying processes of transformers, wires and cables, and capacitors in the power industry. It is an ideal vacuum equipment for vacuum coating, vacuum smelting, vacuum heat treatment, vacuum oil filtration, freeze drying, and aviation simulation tests. During use, the gas is discharged from the exhaust hole of the sliding valve pump. The discharged gas will contain small dust-like particles and impurities with a pungent odor, causing environmental pollution and failing to meet environmental protection standards.

[0003] Through searching, the existing filter assembled on the sliding valve pump, such as the deep gas-liquid separation filter described in the Chinese patent with the patent number of "1821111726.2" and the authorization announcement number of "CN208632475U", has the following specific structure: it includes a base, the inner wall of the base is fixedly connected with a separation cylinder, the inner wall of the separation cylinder is fixedly connected with a support plate and a partition along the vertical direction, the side wall of the partition is fixedly connected with a spiral guide plate, the upper surface of the separation cylinder is provided with a threaded hole, and the threaded hole is threadedly connected with an outlet joint, the lower surface of the outlet joint is movably sleeved with a filter element, the bottom end of the filter element is movably connected with the upper surface of the support plate, and the upper surface of the support plate is fixedly provided with a clamping machine The invention discloses a structure in which the side wall of the separation cylinder is fixedly connected with an air inlet pipe, the lower surface of the separation cylinder is provided with a circular through hole, and the hole wall of the circular through hole is fixedly connected with a drain pipe, the inner wall of the drain pipe is fixedly provided with an electric valve, the end of the drain pipe away from the separation cylinder is fixedly connected with a filter box, the inner wall of the filter box is fixedly connected with a filter screen plate, the side of the filter box away from the drain pipe is fixedly connected with a conduit, the lower surface of the filter box is provided with a rectangular through hole, and the hole wall of the rectangular through hole is movably connected with a sealing plug, the left and right side walls of the sealing plug are fixedly connected with fixed blocks, the lower surfaces of the two fixed blocks are provided with threaded holes, and the threaded holes are connected with bolts through threaded joints, and the lower surface of the filter box is provided with a threaded blind hole matching the bolts.

[0004] In the above structure, a spiral guide plate is fixed on the side wall of the partition, and the airflow performs spiral motion along with the spiral guide plate. The airflow is adsorbed and separated on the outer wall of the spiral guide plate and the inner wall of the separation cylinder, but the centrifugal separation effect of the airflow is poor. As the flow rate of the airflow increases, the airflow will soon flow out from the gas phase outlet pipe of the cylindrical container, and the separation effect of the gas phase and the liquid phase is poor, which is inconvenient to use. In the large exhaust section of the sliding valve pump, the pressure loss caused by the general filter during operation is large, and it is difficult for the oil in the filter to return to the sliding valve pump tank, and even the oil backflow phenomenon may occur. Summary of the invention

[0005] The object of the present invention is to provide a filter for a slide valve pump, which has a simple structure, low cost, good gas-liquid separation effect of the air flow, and thorough separation, aiming at the above problems existing in the prior art.

[0006] The object of the present invention can be achieved by the following technical solutions: A filter for a slide valve pump includes a lower housing and an upper housing. An intake pipe is provided on the lower housing, and the intake pipe extends into the lower housing and forms a liquid accumulation pool between the intake pipe and the lower housing. An exhaust pipe is provided on the upper housing. The upper housing and the lower housing are connected relatively to form a cavity for gas-liquid filtration and separation. The intake pipe and the exhaust pipe are communicated through the cavity. It is characterized in that a filter element is provided on the intake pipe in the cavity between the intake pipe and the exhaust pipe. A centrifugal guiding device for annular air flow is provided between the filter element and the lower housing. A flow resistance guiding device for folding air flow is also provided between the filter element above the centrifugal guiding device and the lower housing. The air flow flows in from the intake pipe, and the centrifugal guiding device makes the air flow flow annularly and centrifugally, and gas-liquid separation is formed by using centrifugal force. The liquid flows into the liquid accumulation pool, and the remaining air flow flows to the flow resistance guiding device, and the air flow collides through the flow resistance guiding device to form gas-liquid separation again. The liquid flows into the liquid accumulation pool, and the gas is discharged through the exhaust pipe of the upper housing.

[0007] The filter for the slide valve pump mainly weakens the energy of the air flow through the centrifugal guiding device and the flow resistance guiding device, so that the oil carried by the air flow is less and less. The state of the oil and oil vapor in the air flow is changed through the centrifugal guiding device and the flow resistance guiding device, so that it does not meet the requirement of being carried, so that the oil and oil vapor in the air flow are continuously separated out to achieve the purpose of filtration. The filter for the slide valve pump is specially used for the large exhaust section of the slide valve pump, the flow channel is smooth, the pressure loss is small, and the oil return can be ensured; when the air flow passes through the centrifugal guiding device, most of the oil in the air flow is filtered out by using the centrifugal separation effect; at the same time, the annular air mass in the semi-closed space can squeeze the liquid accumulation pool, which will increase the oil pressure difference between the liquid accumulation pool and the oil tank of the slide valve pump and improve the oil return efficiency.

[0008] In the above-mentioned filter for a slide valve pump, the filter element includes a lower inner tube and an upper inner tube with a circular cover plate. The upper inner tube and the lower inner tube are axially spaced apart. An outer tube sleeve is sleeved between the upper inner tube and the lower inner tube, and the upper ends of the upper inner tube and the outer tube sleeve are fixedly connected, and the lower ends of the lower inner tube and the outer tube sleeve are fixedly connected. The outer tube sleeve and the upper inner tube and the lower inner tube are spaced and cooperated to form an air flow channel. An internal thread is provided on the inner wall of the lower end of the lower inner tube, and an external thread is provided on the outer wall of the upper end of the intake pipe. The internal thread at the lower end of the lower inner tube is screwed onto the external thread at the upper end of the intake pipe. The lower inner tube and the intake pipe are axially connected. The upper inner tube and the lower inner tube are axially spaced apart, so that the air flow flows from the axial interval between the upper inner tube and the lower inner tube. Under the action of the high-speed direct impact of the air flow in the same axis, an air flow buffer zone is formed inside the upper inner tube and the circular cover plate. An oil buffer pool is gradually formed by the accumulation of oil in the air flow buffer zone between the upper inner tube and the circular cover plate, and finally an arc-shaped liquid level is formed. The buffer oil pool can play a good buffering role for the oil in the air flow and weaken the kinetic energy of the oil.

[0009] In the above-mentioned filter for a slide valve pump, the centrifugal guiding device includes circumferentially evenly distributed centrifugal channels on the outer wall of the lower end of the outer tube sleeve. Each centrifugal channel is arc-shaped and the caliber of the centrifugal channel gradually increases towards the outlet. The air flow is ejected tangentially from the centrifugal channels of the outer tube sleeve and is restricted by the inner wall of the lower housing, and the air flow moves annularly along the inner wall of the lower housing. As the air flow continuously increases, an annular air mass is formed. Since the greater the speed and mass of the air flow, the greater the centrifugal force exerted on the air flow, the speed of the air flow in the annular air mass decreases continuously from the outside to the inside along the radial direction. After the exhaust air flow rushes out of the filter element and enters the annular air mass, the speed of the exhaust air flow must be greater than the speed of the surrounding annular air flow at this time. Under the action of a relatively large centrifugal force, the exhaust air flow will continue to move outward and finally move on the outermost side and then merge into the annular air mass; while the liquid has a relatively large mass and moves on the outside of the annular air mass, forming an oil film on the inner wall of the lower housing. The thickness of the oil film is affected by the exhaust volume of the pump and is relatively stable. When the oil continues to increase, the oil film will spread axially upward and downward. Restricted by the flow resistance guiding device upward, the oil can only spiral downward into the liquid accumulation pool under the action of the annular air mass and the centrifugal force.

[0010] In the above-mentioned filter for a slide valve pump, the flow resistance guiding device includes outer annular plate one and outer annular plate two which are arranged at intervals along the axial direction of the outer sleeve on the outer wall of the outer sleeve. A circular bottom plate is arranged on the outer wall of the lower inner pipe. Inner annular plate one and inner annular plate two are axially spaced and distributed on the inner wall of the lower housing. The outer annular plate one, outer annular plate two, circular bottom plate, inner annular plate one and inner annular plate two are axially misaligned. The outer annular plate one, outer annular plate two, circular bottom plate, inner annular plate one and inner annular plate two form a labyrinth structure, forcing the air flow to turn, increasing the number of air flow collisions, and ensuring that the air flow in all parts will collide with the inner wall it flows through, improving the air flow separation effect, increasing the capture area during air flow separation, and improving the capture efficiency. In order to further improve the filtering effect, the paired number of outer annular plates and inner annular plates can be increased according to the size of the air flow; the outer diameters of the outer annular plate one and outer annular plate two and the inner diameters of the inner annular plate one and inner annular plate two decrease successively from top to bottom according to the installation position, and it is ensured that the air flow baffle channel is light-tight; the outer diameters of the outer annular plate one and outer annular plate two and the inner diameters of the inner annular plate one and inner annular plate two need to have a certain baffle depth (that is, the radial widths of the outer diameters of the outer annular plate one and outer annular plate two and the inner diameters of the inner annular plate one and inner annular plate two) to limit the movement intensity of the part of the air flow adhering to the wall, avoiding affecting the oil drainage efficiency of the outer wall of the outer sleeve and the inner wall of the lower housing; during actual manufacturing, oil passing holes are circumferentially and evenly distributed at the inner edges of the inner annular plate one and inner annular plate two which are axially spaced and distributed on the inner wall of the lower housing. The oil passing holes are used for oil drainage on the inner wall of the lower housing. An inclined baffle is also arranged at a position below the inner annular plate two. The inclined baffle is inclined downward along the air flow direction. The purpose of this setting is to avoid the oil passing holes on the inner annular plate two from contacting the annular air mass and ensure the oil drainage effect of the inner wall of the lower housing.

[0011] In the above-mentioned filter for a slide valve pump, the centrifugal channel is located between the circular bottom plate and the outer annular plate two. The centrifugal channel includes axially arc-shaped baffles which are circumferentially and evenly distributed on the outer wall of the lower end of the outer sleeve. The axially arc-shaped baffles are vertically fixed to the circular bottom plate, and the upper edge of the axially arc-shaped baffles is vertically folded and extended to the outer wall of the outer sleeve to form an arc-shaped channel between the axially arc-shaped baffles and the outer sleeve. The arc-shaped channel is communicated with the inner cavity of the outer sleeve. Arc-shaped baffle plates are also circumferentially spaced and distributed on the outer wall of the lower inner pipe. The arc-shaped baffle plates axially separate the lower inner pipe and the outer sleeve and make the arc-shaped channel form a spiral arc-shaped opening shape with the lower inner pipe as the center. The axially arc-shaped baffles are used to guide the flow direction of the air flow, so that the air flow can enter the annular air mass tangentially when discharged from the outer sleeve, avoiding adverse effects on the annular air mass. At the same time, the air flow can retain a relatively large circumferential speed, which is beneficial to strengthening the gas-liquid separation effect of the annular air mass.

[0012] In the above-mentioned filter for a slide valve pump, on the outer wall of the outer tube sleeve between the first outer annular plate and the second outer annular plate, radially arranged partition plates are circumferentially and evenly distributed. The upper edge of the partition plate extends to the first outer annular plate, and the lower edge of the partition plate extends to the second outer annular plate. The inner edge of the second outer annular plate is circumferentially and evenly distributed with oil passing holes. In actual design, the number of the oil passing holes corresponds to the number of the partition plates, and the oil passing holes are all located below the partition plates.

[0013] The partition plate can restrict the flow of air, facilitate the convergence of oil, concentrate the downward flow of oil, and improve the efficiency of downward oil flow; the partition plate can also reduce the air flow speed in the vicinity, which is beneficial to stabilizing the effect of downward oil flow; the upper edge of the partition plate extends to the first outer annular plate, and the lower edge of the partition plate extends to the second outer annular plate, which can effectively prevent the first outer annular plate and the second outer annular plate from deforming due to the impact of air flow.

[0014] In the above-mentioned filter for a slide valve pump, at the upper pipe orifice of the upper inner pipe, there is a circular cover plate connected by sealing. The outer diameter of the circular cover plate is larger than the outer diameter of the upper inner pipe. The circular cover plate and the first outer annular plate are axially spaced and cooperated to form an annular buffer recess. The fact that the outer diameter of the circular cover plate is larger than the outer diameter of the upper inner pipe forms a pipe cap top, so that when the downward air flow in the upper shell passes above the first outer annular plate, the oil in the air flow has a large specific gravity and is not easy to change direction. The oil is easy to impact and then deposit on the upper surface of the first outer annular plate. The upper inner pipe protruding from the first outer annular plate can prevent the oil from converging towards the center, avoid the oil contacting the strongly rising air flow, and eliminate the power for the oil to be entrained and discharged; the circular cover plate forms a pipe cap eaves (that is, protruding and extending in the direction opposite to the air flow movement direction), thus cutting off the path for the oil to crawl upward to the upper plane of the circular cover plate where it can contact the rising air flow.

[0015] In the above-mentioned filter for a slide valve pump, on the outer wall of the lower inner pipe, axially arranged lower oil pipes are circumferentially and evenly distributed. The lower pipe orifices of the lower oil pipes extend into the liquid accumulation pool, and the upper pipe orifices of the lower oil pipes extend to the position of the first outer annular plate and communicate with the annular buffer recess. The purpose of such a setting is: first, it can accumulate oil below the first outer annular plate, improve the buffering effect, and reduce the impact and splashing of oil; second, an oil pool is formed by the accumulation of oil, and the local oil level and oil pressure are increased by the impact of air flow to ensure the efficiency of downward oil flow; the first outer annular plate forms a certain protruding height, which can significantly increase the cross-sectional area of the peripheral annular channel, reduce the air flow speed, reduce the entrainment ability of the air flow, and is beneficial to improving the oil deposition efficiency. According to the actual situation, the coverage rate of the circular cover plate can be increased to further improve the oil deposition rate.

[0016] In the above-mentioned filter for a slide valve pump, a number of semi-lunar plates are alternately arranged left and right along the axis of the exhaust pipe in the exhaust pipe. There is an axial spacing fit between two adjacent semi-lunar plates. An outward-turning edge is also provided at the inner channel opening of the exhaust pipe. A rotary concave position is formed between the outward-turning edge and the exhaust pipe. Multiple semi-lunar plates are arranged inside the exhaust pipe for air flow grading. The rotary concave position can meet the air exhaust requirements of the air flow and can significantly increase the effective cooling area. By using the collision between the air flow and the semi-lunar plates, the overall cooling effect of the air flow is good. At the same time, the air flow will collide with the pipe wall of the exhaust pipe and the semi-lunar plates multiple times. The kinetic energy loss of the condensed oil liquid is large and the contact times are many, so it is very easy to be captured, thus obtaining a better filtering effect.

[0017] In the above-mentioned filter for a slide valve pump, a first cooling cavity is arranged inside the upper shell body. A second cooling cavity is arranged on the exhaust pipe located inside the upper shell body. The first cooling cavity and the second cooling cavity are connected and communicated. An inlet joint and an outlet joint are also arranged on the upper shell body. Both the inlet joint and the outlet joint are communicated with the first cooling cavity. The oil liquid content in the air flow on the exhaust pipe of the upper shell body is very small, but it is rich in saturated steam containing oil. By cooling through the first cooling cavity and the second cooling cavity, the temperature of the air flow is reduced, so that the oil vapor in the air flow can be captured by the semi-lunar plates and the pipe wall of the exhaust pipe after liquefaction, further improving the filtering effect and reducing oil and gas emissions.

[0018] Compared with the prior art, the advantages of the filter for this slide valve pump are as follows: The structure design is reasonable and simple. It can effectively gradually weaken the flow of the air flow, so that the air flow cannot meet the requirements of being carried by the air flow when flowing in the upper shell body and the lower shell body. Thus, the oil liquid and oil vapor in the air flow are continuously separated out, forming gas-liquid separation, achieving the purpose of filtration. The filtering effect is good, the structure is stable, and it is convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the exploded three-dimensional structural schematic diagram of the filter for this slide valve pump.

[0020] Figure 2 is the sectional structural schematic diagram of the filter for this slide valve pump.

[0021] Figure 3 is Figure 2 the sectional structural schematic diagram in the A-A direction in

[0022] Figure 4 is Figure 2 the sectional structural schematic diagram in the B-B direction in

[0023] Figure 5 is the sectional structural schematic diagram of the lower shell body of the filter for this slide valve pump.

[0024] In the figure, 1 is the lower housing; 2 is the upper housing; 3 is the intake pipe; 4 is the liquid accumulation pool; 5 is the exhaust pipe; 6 is the lower inner pipe; 6a is the arc-shaped baffle; 7 is the circular cover plate; 8 is the upper inner pipe; 9 is the outer pipe sleeve; 10 is the centrifugal channel; 11 is the first outer annular plate; 12 is the second outer annular plate; 13 is the annular bottom plate; 14 is the first inner annular plate; 15 is the second inner annular plate; 16 is the axial arc-shaped baffle; 17 is the partition plate; 18 is the annular buffer recess; 19 is the lower oil pipe; 20 is the meniscus; 21 is the outward turning edge; 22 is the rotary recess; 23 is the first cooling cavity; 24 is the second cooling cavity; 25 is the water inlet joint; 26 is the water outlet joint. Detailed implementation manner

[0025] The following are specific embodiments of the present invention and, in combination with the accompanying drawings, further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0026] As Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 shown, the filter for this slide valve pump mainly consists of a lower housing 1 and an upper housing 2. An intake pipe 3 is provided on the lower housing 1. The intake pipe 3 extends into the lower housing 1 and forms a liquid accumulation pool 4 between it and the lower housing 1. (The function of this liquid accumulation pool 4 is: used to capture and store oil, which is beneficial for the oil to return to the oil tank of the slide valve pump). An exhaust pipe 5 is provided on the upper housing 2. The upper housing 2 and the lower housing 1 are relatively connected to form a cavity for gas-liquid filtration and separation. The intake pipe 3 and the exhaust pipe 5 are communicated through the cavity. A filter element is provided on the intake pipe 3 in the cavity between the intake pipe 3 and the exhaust pipe 5. A centrifugal guiding device for annular airflow is provided between the filter element and the lower housing 1. A flow resistance guiding device for airflow baffle flow is also provided between the filter element above the centrifugal guiding device and the lower housing 1. The airflow flows in from the intake pipe 3, and through the centrifugal guiding device, the airflow flows in a circular and centrifugal manner and forms gas-liquid separation by using centrifugal force. The liquid flows into the liquid accumulation pool 4, and the remaining airflow flows to the flow resistance guiding device and forms gas-liquid separation again through the collision of the airflow by the flow resistance guiding device. The liquid flows into the liquid accumulation pool 4, and the gas is discharged through the exhaust pipe 5 of the upper housing 2.

[0027] As Figure 1 , Figure 2 shown, during actual manufacturing, the filter element mainly consists of a lower inner pipe 6 and an upper inner pipe 8 with a circular cover plate 7.

[0028] The upper inner tube 8 and the lower inner tube 6 are axially spaced apart. An outer tube sleeve 9 is sleeved between the upper inner tube 8 and the lower inner tube 6, and the upper ends of the upper inner tube 8 and the outer tube sleeve 9 are fixedly connected, and the lower ends of the lower inner tube 6 and the outer tube sleeve 9 are fixedly connected. The outer tube sleeve 9 and the upper inner tube 8 and the lower inner tube 6 are spaced and cooperate to form an air flow channel. An internal thread is provided on the inner wall at the lower end of the lower inner tube 6, and an external thread is provided on the outer wall at the upper end of the intake pipe 3. The internal thread at the lower end of the lower inner tube 6 is screwed onto the external thread at the upper end of the intake pipe 3; a buffer space for air flow is formed at the radial interval between the outer tube sleeve 9 and the upper inner tube 8 and the lower inner tube 6. This buffer space can cause the oil in the air flow to be diverted, and the kinetic energy of some of the air flow is weakened after multiple collisions with the inner wall of the outer tube sleeve 9 and the outer walls of the upper inner tube 8 and the lower inner tube 6. In actual manufacturing, the centrifugal guiding device is mainly composed of circumferentially evenly distributed centrifugal channels 10 on the outer wall of the lower end of the outer tube sleeve 9. Each centrifugal channel 10 is arc-shaped and the caliber of the centrifugal channel 10 gradually increases towards the outlet; the flow resistance guiding device is mainly composed of an outer annular plate one 11 and an outer annular plate two 12 which are spaced along the axial direction of the outer tube sleeve 9 on the outer wall of the outer tube sleeve 9. An annular bottom plate 13 is provided on the outer wall of the lower inner tube 6, and inner annular plate one 14 and inner annular plate two 15 are axially spaced and distributed on the inner wall of the lower housing 1. The outer annular plate one 11, the outer annular plate two 12, the annular bottom plate 13 and the inner annular plate one 14 and the inner annular plate two 15 are axially misaligned; the outer diameter of the circular cover plate 7 is larger than the outer diameter of the upper inner tube 8, and the circular cover plate 7 and the outer annular plate one 11 are axially spaced and cooperate to form an annular buffer recess 18; circumferentially spaced and axially arranged lower oil pipes 19 are distributed on the outer wall of the lower inner tube 6. The lower pipe orifices of each lower oil pipe 19 extend into the liquid accumulation pool 4, and the upper pipe orifices of each lower oil pipe 19 extend to the outer annular plate one 11 and communicate with the annular buffer recess 18; the purpose of the lower end of the lower oil pipe 19 extending into the liquid accumulation pool 4 is to seal the pipe orifice at the lower end of the lower oil pipe 19 with oil, so as to avoid the exhaust air flow contacting the oil and affecting the oil at the upper pipe orifice of the lower oil pipe 19 from flowing down to the liquid accumulation pool 4.

[0029] Specifically: The centrifugal channel 10 is located between the annular bottom plate 13 and the outer annular plate two 12. The centrifugal channel 10 includes axially arc-shaped baffles (16) that are circumferentially evenly distributed on the outer wall of the lower end of the outer tube sleeve 9. The axially arc-shaped baffles (16) are vertically fixedly connected to the annular bottom plate (13), and the upper edge of the axially arc-shaped baffles (16) is vertically folded and extended to the outer wall of the outer tube sleeve (9) and forms an arc-shaped channel with the outer tube sleeve (9). This arc-shaped channel communicates with the inner cavity of the outer tube sleeve (9). Arc-shaped blocking plates (6a) are also circumferentially spaced and distributed on the outer wall of the lower inner tube (6). The arc-shaped blocking plates (6a) are axially separated between the lower inner tube (6) and the outer tube sleeve (9) and make the arc-shaped channel form a spiral arc-shaped opening shape centered on the lower inner tube (6). As Figure 3 、 Figure 4As shown, a slow-flow region will be formed in the outer region of the axial arc-shaped baffle 16. Under the action of centrifugal force, the air flow with the slowest tangential velocity in the annular air mass is squeezed here, and then blocked by the axial arc-shaped baffle 16, resulting in a further decrease in the tangential movement speed, forming a slow-flow region, and then being discharged upward under the extrusion of the surrounding air flow (because it will be blocked by the annular bottom plate 13 when moving downward).

[0030] During actual manufacturing, radial partition plates 17 are circumferentially and evenly distributed on the outer wall of the outer pipe sleeve 9 between the first outer annular plate 11 and the second outer annular plate 12. The upper edges of the partition plates 17 extend to the first outer annular plate 11, and the upper edges of the partition plates 17 extend to the second outer annular plate 12. Oil passing holes are circumferentially and evenly distributed on the inner edge of the second outer annular plate 12.

[0031] During actual manufacturing, four semi-lunar plates 20 are alternately arranged left and right along the axis of the exhaust duct 5 in the exhaust duct 5. The adjacent two semi-lunar plates 20 are axially spaced and matched. An outward-turned edge 21 is provided at the inner channel opening of the exhaust duct 5, and a rotary concave position 22 is formed between the outward-turned edge 21 and the exhaust duct 5; a first cooling cavity 23 is provided in the upper housing 2, and a second cooling cavity 24 is provided on the exhaust duct 5 located in the upper housing 2. The first cooling cavity 23 and the second cooling cavity 24 are communicated with each other. An inlet joint 25 and an outlet joint 26 are further provided on the upper housing 2, and both the inlet joint 25 and the outlet joint 26 are communicated with the first cooling cavity 23.

[0032] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A filter for a slide valve pump, comprising a lower housing (1) and an upper housing (2). An intake pipe (3) is provided on the lower housing (1), and the intake pipe (3) extends into the lower housing (1) and forms a liquid accumulation pool (4) between the intake pipe (3) and the lower housing (1). An exhaust pipe (5) is provided on the upper housing (2). The upper housing (2) and the lower housing (1) are connected relatively to form a cavity for gas-liquid filtration and separation. The intake pipe (3) and the exhaust pipe (5) are communicated through the cavity. It is characterized in that, A filter element is provided on the intake pipe (3) in the cavity between the intake pipe (3) and the exhaust pipe (5). A centrifugal guiding device for annular airflow is provided between the filter element and the lower housing (1). A flow resistance guiding device for airflow to flow in a deflected manner is also provided between the filter element above the centrifugal guiding device and the lower housing (1). The airflow flows in from the intake pipe (3), and the centrifugal guiding device makes the airflow flow in a circular and centrifugal manner, and gas-liquid separation is formed by using centrifugal force. The liquid flows into the liquid accumulation pool (4), and the remaining airflow flows to the flow resistance guiding device, and the flow resistance guiding device makes the airflow collide to form gas-liquid separation again. The liquid flows into the liquid accumulation pool (4), and the gas is discharged through the exhaust pipe (5) of the upper housing (2). The filter element includes a lower inner pipe (6) and an upper inner pipe (8) with a circular cover plate (7). The upper inner pipe (8) and the lower inner pipe (6) are axially spaced and distributed. An outer pipe sleeve (9) is sleeved between the upper inner pipe (8) and the lower inner pipe (6), and the upper ends of the upper inner pipe (8) and the outer pipe sleeve (9) are fixedly connected, and the lower ends of the lower inner pipe (6) and the outer pipe sleeve (9) are fixedly connected. The outer pipe sleeve (9) and the upper inner pipe (8) and the lower inner pipe (6) are spaced and matched to form an air flow channel. An internal thread is provided on the inner wall of the lower end of the lower inner pipe (6), and an external thread is provided on the outer wall of the upper end of the intake pipe (3). The internal thread at the lower end of the lower inner pipe (6) is screwed onto the external thread at the upper end of the intake pipe (3). The centrifugal guiding device includes centrifugal channels (10) circumferentially and evenly distributed on the outer wall of the lower end of the outer pipe sleeve (9). Each centrifugal channel (10) is arc-shaped, and the diameter of the centrifugal channel (10) gradually increases towards the outlet. A plurality of semi-lunar plates (20) are alternately arranged left and right along the axis of the exhaust pipe (5) in the exhaust pipe (5). Axial spacing and matching are provided between two adjacent semi-lunar plates (20). An outward turning edge (21) is also provided at the inner channel opening of the exhaust pipe (5), and a rotary concave position (22) is formed between the outward turning edge (21) and the exhaust pipe (5).

2. The filter for a spool pump according to claim 1, characterized in that, The flow resistance guiding device includes an outer annular plate one (11) and an outer annular plate two (12) which are spaced along the axial direction of the outer pipe sleeve (9) on the outer wall of the outer pipe sleeve (9). An annular bottom plate (13) is provided on the outer wall of the lower inner pipe (6). Inner annular plate one (14) and inner annular plate two (15) are axially spaced and distributed on the inner wall of the lower housing (1). The outer annular plate one (11), the outer annular plate two (12), the annular bottom plate (13) and the inner annular plate one (14), the inner annular plate two (15) are axially misaligned and distributed.

3. The filter for a spool pump according to claim 2, characterized in that, The described centrifugal channel (10) is located between the annular bottom plate (13) and the outer annular plate two (12). The centrifugal channel (10) includes axially-arc-shaped baffles (16) that are circumferentially and evenly distributed on the outer wall of the lower end of the outer pipe sleeve (9). The axially-arc-shaped baffles (16) are vertically fixed to the annular bottom plate (13), and the upper edge of the axially-arc-shaped baffles (16) is vertically folded and extended to the outer wall of the outer pipe sleeve (9) to form an arc-shaped channel with the outer pipe sleeve (9). The arc-shaped channel communicates with the inner cavity of the outer pipe sleeve (9). On the outer wall of the described lower inner pipe (6), there are also arc-shaped blocking plates (6a) that are circumferentially spaced. The arc-shaped blocking plates (6a) are axially separated between the lower inner pipe (6) and the outer pipe sleeve (9), and the arc-shaped channel forms an arc-shaped opening shape centered on the lower inner pipe (6).

4. The filter for a spool pump according to claim 3, characterized in that, On the outer wall of the outer pipe sleeve (9) between the outer annular plate one (11) and the outer annular plate two (12), there are radially arranged partition plates (17) that are circumferentially and evenly spaced. The upper edge of the partition plate (17) extends to the outer annular plate one (11), and the lower edge of the partition plate (17) extends to the outer annular plate two (12). The inner edge of the outer annular plate two (12) is circumferentially and evenly provided with oil passing holes.

5. The filter for a spool pump according to claim 4, characterized in that, The outer diameter of the described circular cover plate (7) is larger than the outer diameter of the upper inner pipe (8). The circular cover plate (7) and the outer annular plate one (11) are axially spaced and cooperated to form an annular buffer recess (18).

6. The filter for a spool pump according to claim 5, characterized in that, On the outer wall of the described lower inner pipe (6), there are axially arranged lower oil pipes (19) that are circumferentially spaced. The lower pipe orifices of each lower oil pipe (19) extend into the liquid accumulation pool (4), and the upper pipe orifices of each lower oil pipe (19) extend to the position of the outer annular plate one (11) and communicate with the annular buffer recess (18).

7. The filter for a spool pump according to claim 6, characterized in that, A first cooling cavity (23) is arranged in the upper housing (2). A second cooling cavity (24) is arranged on the exhaust pipe (5) located in the upper housing (2). The first cooling cavity (23) and the second cooling cavity (24) are connected. An inlet joint (25) and an outlet joint (26) are also arranged on the upper housing (2). Both the inlet joint (25) and the outlet joint (26) communicate with the first cooling cavity (23).

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