CN110386477B

CN110386477B - Spiral pressure discharger

Info

Publication number: CN110386477B
Application number: CN201910613913.3A
Authority: CN
Inventors: 葛念超; 沈滨; 吴杰
Original assignee: Jiangsu Zhiyong Renheng New Energy Equipment Co ltd
Current assignee: Jiangsu Zhiyong Renheng new energy equipment Co.,Ltd.
Priority date: 2019-07-09
Filing date: 2019-07-09
Publication date: 2021-11-30
Anticipated expiration: 2039-07-09
Also published as: CN110386477A

Abstract

The invention relates to a spiral pressure discharger which comprises a discharge barrel, wherein a material stirring shaft is rotatably connected to the center of a bottom plate of the discharge barrel, a material supporting plate is arranged inside the discharge barrel, the material stirring shaft penetrates through the material supporting plate upwards and is connected with a material stirring paddle, a spiral shaft is arranged on one side of the material stirring shaft, a material stirring opening which is opposite to the spiral shaft in the vertical direction is formed in the material supporting plate, a U-shaped groove body is connected below the material stirring opening, the spiral shaft is suspended in the U-shaped groove body, two ends of the U-shaped groove body are respectively connected with the inner side wall of the discharge barrel in a sealing mode and are respectively communicated with a first positioning pipe and a discharge pipe on the outer wall of the discharge barrel, and the spiral shaft extends into the discharge pipe to push materials out of the discharge pipe. According to the invention, the material stirring paddle is arranged in the discharging cylinder, so that the flowability of the material in the discharging cylinder is improved, the discharging cylinder stores more materials without bridging, the material spraying frequency is reduced, the steam usage is directly reduced, and when the spraying period is set to 20 seconds, the steam usage of straw pretreatment per ton is reduced by 0.3 ton.

Description

Spiral pressure discharger

Technical Field

The invention relates to a spiral pressure discharger

Background art:

the cellulose fuel ethanol is a research hotspot at present, has a wide development prospect and will become one of the most important renewable energy sources in the future.

A continuous pretreatment technology process of straw cellulose fuel ethanol comprises the following steps: the crushed and purified raw materials are mixed with liquid medicine according to a set liquid ratio, and the materials are compressed by a plug flow screw machine under normal pressure to manufacture a tight plug which is used as a carrier for sealing pressure. Then the plug enters a spiral reactor after passing through a plug loosening machine, the reaction is carried out under the set high temperature and high pressure, and finally the high-concentration spraying of the process materials is realized by a spiral pressure discharger (hereinafter referred to as a discharger). The discharger directly influences whether the process materials can realize the blowing and steam explosion under the high-concentration condition. The flexible adjustment of the spraying parameters, the steam consumption, the service life of equipment and the reliability of continuous operation are one of the important problems to be solved in the popularization and application of the cellulose fuel ethanol technology.

The traditional spiral pressure discharger comprises a discharge cylinder and a spiral shaft transversely penetrating through the discharge cylinder, one end of the spiral shaft is in transmission connection with a material pushing driving device, the other end of the spiral shaft is communicated with a steam explosion bin through a pipeline, a valve is arranged on the pipeline and used for isolating the communication relation between the discharge cylinder and the steam explosion bin, due to the structural form of the traditional discharge cylinder, after a certain amount of materials are stored in the discharge cylinder, the valve is required to be opened for carrying out one-time material spraying and discharging, the materials are pushed into the pipeline through the spiral shaft, then the valve is opened, under the pressure difference formed by the high pressure in the discharge cylinder and the low pressure in the steam explosion bin, the materials are quickly sprayed into the steam explosion bin through the pipeline to carry out gas explosion to form powdery raw materials, and through statistics, when the materials are stored in the traditional spiral pressure discharger, one-time spraying and discharging is basically carried out every 10 seconds, because the materials are too much accumulated, the materials in the discharge cylinder are bridged and cannot be smoothly drawn into a channel through the spiral shaft, this can cause production interruptions.

The invention content is as follows:

the invention firstly solves the technical problems that: the spiral pressure discharger is not easy to bridge accumulated materials, so that the material accumulation amount is improved, the material spraying frequency is reduced, and the steam consumption is reduced.

In order to solve the technical problems, the invention adopts the technical scheme that: a spiral pressure discharger comprises a vertically arranged discharge barrel with an opening at the upper end, and is characterized in that the lower end of the discharge barrel is sealed by a bottom plate, a shaft hole is formed in the center of the bottom plate and is in rotating connection with a vertically arranged stirring shaft, the lower end of the stirring shaft extends out of the bottom plate and is in transmission connection with a stirring driving device, a material supporting plate is horizontally arranged in the discharge barrel, the stirring shaft penetrates through the material supporting plate upwards and is fixedly connected with a stirring paddle above the material supporting plate, a spiral shaft is horizontally arranged on one side of the stirring shaft, the spiral shaft penetrates through the discharge barrel, both ends of the spiral shaft extend out of the discharge barrel, the upper edge of the spiral shaft is lower than the upper end surface of the material supporting plate, a first positioning pipe matched with the rear end of the spiral shaft and a discharge pipe matched with the front end of the spiral shaft are respectively connected to the outer wall of the discharge barrel, one end of the first positioning pipe, far away from the discharge barrel, is connected with a transparent cover through a transmission shaft which is coaxially connected with the spiral shaft in a sealing manner in the transparent cover, the one end that the screw axis was kept away from to the transmission shaft stretches out the other side of passing through the lid and is connected with pushing away the material drive arrangement transmission, the one end that the stripper was kept away from to the discharging pipe is through a valve and gas explosion storehouse intercommunication, set up on the die-pad and dial the material mouth with the screw axis dead ahead from top to bottom, dial the material mouth below and be connected with the U-shaped cell body, the screw axis hangs and establishes in the U-shaped cell body, and the both ends of U-shaped cell body respectively with the inside wall sealing connection of stripper and respectively with first registration arm, discharging pipe intercommunication, the U-shaped cell body is cut apart into mutually independent material chamber and pressure balance chamber with the space in the stripper jointly with the die-pad, and the material chamber is located die-pad and U-shaped cell body top, and the pressure balance chamber is located die-pad and U-shaped cell body below, is connected with intake pipe and blow off pipe that the pressure balance chamber communicates on the stripper.

As a preferred scheme, a conical buffer tube is connected to an opening at the upper end of the discharging cylinder, the buffer tube extends upwards, a feed inlet is formed in the upper end of the buffer tube, and the inner diameter of the lower end of the buffer tube is larger than that of the upper end of the buffer tube.

As a preferred scheme, one side of the transparent cover back to the discharge cylinder is connected with a support, the support is fixedly connected with two bearing seats, the part of the transmission shaft, which is positioned outside the transparent cover, is rotatably connected to the two bearing seats, one end, which is far away from the screw shaft, of the transmission shaft penetrates through the two bearing seats and then is in transmission connection with the material pushing driving device, the material pushing driving device is fixedly connected to the support through a connecting seat, the transmission shaft is fixedly sleeved with a first water throwing disc, and the first water throwing disc is positioned outside the transparent cover.

As a preferred scheme, a sleeve is vertically connected in a shaft hole in the center of the bottom plate, a cooling water tank is arranged in the sleeve in the circumferential direction, a second positioning pipe is inserted in the sleeve, the upper end of the second positioning pipe penetrates through the material supporting plate and is in sealing connection with the material supporting plate, the material stirring shaft is rotatably connected in the second positioning pipe, the inner wall of the lower part of the second positioning pipe is radially sunken to form a packing cavity, packing is arranged in the packing cavity, a gland with the upper end inserted into the packing cavity from the lower end of the second positioning pipe and tightly abutted to the packing is sleeved on the material stirring shaft, the gland is fixedly connected to the lower end of the sleeve through a bolt, a second water throwing disc is fixedly connected to the material stirring shaft below the gland, a positioning seat is sleeved on the material stirring shaft at the lower part of the second water throwing disc, the positioning seat is fixedly connected with the bottom plate through a plurality of vertically arranged connecting rods positioned around the material stirring shaft, and the material stirring driving device is fixedly connected to the positioning seat, and cooling channels communicated with the cooling water tank are arranged in the bottom plate and the sleeve, and a cooling water inlet and a cooling water outlet are formed in the side surface of the bottom plate.

As a preferred scheme, a plurality of anti-slip strips extending along the axial direction of the U-shaped groove body are uniformly distributed on the inner side wall of the U-shaped groove body.

The invention has the beneficial effects that: according to the invention, the material stirring paddle is arranged in the discharging cylinder, and materials are stirred into the material stirring port through the material stirring paddle, so that the fluidity of the materials in the discharging cylinder is improved, the discharging cylinder can store more materials without bridging, the material spraying frequency is reduced, the steam usage amount is directly reduced by reducing the material spraying frequency, after the spiral pressure discharger disclosed by the invention is adopted, under the conditions that the internal volume of the discharging cylinder is the same and the continuous straw cellulose fuel ethanol pretreatment process is not changed, the material spraying period can be prolonged to 20-30 seconds once (namely, the materials are sprayed every 20-30 seconds), and when the spraying period is selected to be set to 20 seconds, the steam usage amount of each ton of straw pretreatment is reduced by 0.3 ton.

The buffer tube is further arranged at the upper opening of the discharge cylinder, so that the material bridging phenomenon is further avoided.

The invention further improves the rotation stability of the screw shaft and the transmission shaft through the support and the bearing seat connected to the support, and simultaneously, the pushing driving device is directly fixed on the support through the connecting seat, so that the pushing driving device and the discharging cylinder are integrated into a whole and have common vibration frequency, thereby further improving the pushing stability of the screw shaft and the sealing performance of the transmission shaft.

The material poking driving device is fixedly installed through the positioning seat fixedly connected with the bottom plate, so that the material poking driving device and the discharging barrel are integrated, and the rotation stability of the material poking shaft and the sealing performance of the material poking shaft are improved.

The cooling channel is further arranged on the bottom plate, the cooling water tank is arranged on the inner wall of the sleeve, and the shaft seal of the stirring shaft is cooled by filling circularly flowing cooling water into the cooling water tank, so that the shaft seal is prevented from being burnt, the sealing effect is improved, and the sealing period is prolonged.

The invention further ensures the safe and stable work of the material poking driving device and the material pushing driving device through the first water throwing disc and the second water throwing disc.

Description of the drawings:

the following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:

FIG. 1 is a schematic view of the present invention in partial cross-section;

FIG. 2 is a sectional view A-A of FIG. 1;

figure 3 is a top view of the discharge shaft portion of figure 1.

In FIGS. 1 to 3: 1. the material discharging device comprises a discharging barrel, a bottom plate, a shaft hole, a material stirring shaft, a material stirring driving device, a material supporting plate, a material stirring paddle, a material stirring driving device, a screw shaft, a first positioning pipe, a material discharging pipe, a flange, a transparent cover, a transmission shaft, a material pushing driving device, a valve, a material 16, a steam explosion bin, a 17 material stirring port, an 18U-shaped trough body, a 19 material cavity, a 20 pressure balance cavity, a 21 air inlet pipe, a 22 discharge pipe, a 23 buffer pipe, a 24 material inlet, a 25 support, a 26 bearing seat, a 27 connecting seat, a 28 first water throwing disc, a 29 casing pipe, a 30 cooling water tank, a 31, a second positioning pipe, a 32 material filling cavity, a 33, a filler, a 34, a gland, a 35, a second water throwing disc, a 36 positioning seat, a 37 connecting rod, a 38, a cooling channel, a 39, a cooling water inlet, a 40 and a cooling water outlet.

The specific implementation mode is as follows:

specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1-3, a spiral pressure discharger comprises a vertically arranged discharge cylinder 1 with an open upper end, the lower end of the discharge cylinder 1 is sealed by a bottom plate 2, a shaft hole 3 is formed in the center of the bottom plate 2 and is rotatably connected with a vertically arranged material stirring shaft 4, the lower end of the material stirring shaft 4 extends out of the bottom plate 2 and is in transmission connection with a material stirring driving device 5, a material supporting plate 6 is horizontally arranged inside the discharge cylinder 1, the material stirring shaft 4 penetrates upwards through the material supporting plate 6 and is fixedly connected with a material stirring paddle 7 above the material supporting plate 6, one side of the material stirring shaft 4 is horizontally provided with a spiral shaft 8, the spiral shaft 8 penetrates through the discharge cylinder 1, both ends of the spiral shaft 8 extend out of the discharge cylinder 1, the upper edge of the spiral shaft 8 is lower than the upper end surface of the material supporting plate 6, the outer wall of the discharge cylinder 1 is respectively connected with a first positioning pipe 9 matched with the rear end of the spiral shaft 8 and a discharge pipe 10 matched with the front end of the spiral shaft 8, one end of the first positioning pipe 9 far away from the discharge cylinder 1 is connected with a transparent cover 12 through a flange 11, a transmission shaft 13 coaxially connected with the screw shaft 8 is rotatably and hermetically connected in the transparent cover 12, one end of the transmission shaft 13 far away from the screw shaft 8 extends out of the transparent cover 12 and is in transmission connection with a material pushing driving device 14, one end of the discharge pipe 10 far away from the discharge barrel 1 is communicated with the gas explosion bin 16 through a valve 15, the material supporting plate 6 is provided with a material poking opening 17 which is opposite to the screw shaft 8 up and down, a U-shaped groove body 18 is connected below the material poking opening 17, the screw shaft 8 is suspended in the U-shaped groove body 18, two ends of the U-shaped groove body 18 are respectively in sealing connection with the inner side wall of the discharge barrel 1 and are respectively communicated with the first positioning pipe 9 and the discharge pipe 10, the U-shaped groove body 18 and the material supporting plate 6 jointly divide the space in the discharge barrel 1 into a material cavity 19 and a pressure balance cavity 20 which are independent from each other, the material cavity 19 is positioned above the material supporting plate 6 and the U-shaped groove body 18, the pressure balance cavity 20 is positioned below the material supporting plate 6 and the U-shaped groove body 18, the discharging cylinder 1 is connected with an air inlet pipe 21 and a sewage discharge pipe 22 which are communicated with the pressure balance cavity 20.

The steam in part of the reaction pipeline is introduced into the pressure balance cavity 20 through the air inlet pipe 21, so that the pressure in the pressure balance cavity 20 is consistent with the temperature and the pressure in the reaction pipeline, the pressure in the pressure balance cavity 20 is basically the same as the pressure in the material cavity 19, and the pressure on the retainer plate 6 and the U-shaped groove body 18 is reduced.

As shown in fig. 2, a tapered buffer tube 23 is connected to an opening at the upper end of the discharge cylinder 1, the buffer tube 23 extends upward, a feed inlet 24 is formed at the upper end of the buffer tube 23, and the inner diameter of the lower end of the buffer tube 23 is larger than that of the upper end.

One side of the transparent cover 12, which is opposite to the discharging cylinder 1, is connected with a support 25, the support 25 is fixedly connected with two bearing seats 26, the part of the transmission shaft 13, which is positioned outside the transparent cover 12, is rotatably connected to the two bearing seats 26, one end of the transmission shaft 13, which is far away from the screw shaft 8, penetrates through the two bearing seats 26 and is in transmission connection with the pushing driving device 14, the pushing driving device 14 is fixedly connected to the support 25 through a connecting seat 27, a first water throwing disc 28 is fixedly connected to the transmission shaft 13, the first water throwing disc 28 is positioned outside the transparent cover 12, and the first water throwing disc 28 can radially and outwardly throw out liquid leaked from the shaft sealing position of the transmission shaft 13 along the first water throwing disc 28, so that the liquid is prevented from extending into the pushing driving device 14 along the transmission shaft 13.

A sleeve 29 is vertically connected in the shaft hole 3 in the center of the bottom plate 2, a cooling water tank 30 is arranged in the sleeve 29 in the circumferential direction, a second positioning tube 31 is inserted in the sleeve 29, the upper end of the second positioning tube 31 penetrates through the retainer plate 6 and is hermetically connected with the retainer plate 6, the material stirring shaft 4 is rotatably connected in the second positioning tube 31, the inner wall of the lower part of the second positioning tube 31 is radially recessed to form a packing cavity 32, a packing 33 is arranged in the packing cavity 32, a gland 34 with the upper end inserted into the packing cavity 32 from the lower end of the second positioning tube 31 and tightly abutted against the packing 33 is sleeved on the material stirring shaft 4, the gland 34 is fixedly connected at the lower end of the sleeve 29 through bolts, a second water throwing disc 35 is fixedly connected on the material stirring shaft 4 below the gland 34, a positioning seat 36 is sleeved on the material stirring shaft 4 at the lower part of the second water throwing disc 35, the positioning seat 36 is fixedly connected with the bottom plate 2 through a plurality of vertically arranged connecting rods 37 positioned around the material stirring shaft 4, the material stirring driving device 5 is fixedly connected to the positioning seat 36, a cooling channel 38 communicated with the cooling water tank 30 is arranged inside the bottom plate 2 and the sleeve 29, and a cooling water inlet 39 and a cooling water outlet 40 are formed in the side surface of the bottom plate 2.

In this embodiment, the shaft seal connection mode of the transmission shaft 13 and the transparent cover 12 is similar to the shaft seal connection mode of the material stirring shaft 4 and the bottom plate 2, and the shaft seal is also performed by using the filler, and because the rotation speed of the transmission shaft 13 is slow and the heat generation amount is small, the shaft seal of the transmission shaft 13 is not cooled by water in this embodiment.

The inner side wall of the U-shaped groove body is evenly provided with a plurality of anti-slip strips extending along the axial direction of the U-shaped groove body, so that the materials are prevented from rotating and slipping in the U-shaped groove body.

In this embodiment, the material stirring driving device 5 may be a motor or a speed reducing motor or a combination of a speed reducer and a motor; the pushing driving device can also be a motor or a speed reducing motor or a combination of a speed reducer and a motor.

The working process of the invention is as follows: as shown in fig. 1 to fig. 3, initially, the valve 15 is closed, the feed inlet 24 of the buffer tube 23 at the upper end of the discharging barrel 1 is communicated with the discharge outlet of the upstream material reaction pipeline (not shown in the figure), the inside of the discharging barrel 1 is in the same high-temperature and high-pressure state as the inside of the reaction pipeline, the material continuously enters the discharging barrel 1 from the reaction pipeline through the buffer tube 23, after a period of time, a certain amount of material is gathered in the discharging barrel 1, the material is still in the high-temperature and high-pressure state, steam is immersed into the material, after about 20 seconds, the material stirring driving device 5 is started, the material stirring driving device drives the material stirring shaft 4 to rotate, the material stirring shaft 4 drives the material stirring paddle 7 to rotate to stir the material to flow, the material is stirred into the material stirring port 17, the material enters between blades on the screw shaft 8, and the material pushing driving device 14 is started, the driving shaft 13 and the screw shaft 8 to rotate, the rotation of the screw shaft 8 pushes the materials between the blades to move towards the direction of the valve 15, then the valve is opened, after the materials are separated from the screw shaft, the materials quickly enter the steam explosion bin 16 through the valve 15 under the pushing of pressure difference, the high-temperature and high-pressure steam in the materials quickly flash and expand, the materials are exploded from the internal organization, and fine particles are formed.

Owing to set up group material oar 7 in discharge barrel 1, consequently improved the mobility of material in discharge barrel 1, do not need worry the material and bridge in discharge barrel 1, consequently, can improve discharge barrel 1 to the storage capacity of material to reduce the frequency that the material was spouted, spout once to improve to 20 seconds or even 30 seconds by 10 seconds originally and put once, owing to the reduction of spouting the number of times, greatly reduced the consumption of steam, the steam quantity of per ton straw preliminary treatment reduces 0.3 tons.

The above embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments in use, and are not intended to limit the invention; it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.

Claims

1. Spiral pressure discharger, including vertical setting and upper end open-ended discharging barrel (1), its characterized in that, discharging barrel (1) lower extreme seals through bottom plate (2), and shaft hole (3) and swivelling joint have a stirring axle (4) of vertical setting to be seted up at bottom plate (2) center, and stirring axle (4) lower extreme stretches out outside bottom plate (2) and is connected with stirring drive arrangement (5) transmission, and discharging barrel (1) inside level is provided with one and holds in the palm flitch (6), stirring axle (4) upwards pass after holding in the palm flitch (6) one and dial material oar (7) of material supporting (6) top fixed connection, and stirring axle (4) one side level is provided with a screw axis (8), and this screw axis (8) run through discharging barrel (1) and both ends all stretch out outside discharging barrel (1), and screw axis (8) are gone up along being less than holding in the flitch (6) up end, are connected with first locating tube (9) with screw axis (8) rear end complex on discharging barrel (1) outer wall respectively The discharging pipe (10) is matched with the front end of the spiral shaft (8), one end, far away from the discharging barrel (1), of the first positioning pipe (9) is connected with a transparent cover (12) through a flange (11), a transmission shaft (13) which is coaxially connected with the spiral shaft (8) is connected in the transparent cover (12) in a rotating and sealing mode, one end, far away from the spiral shaft (8), of the transmission shaft (13) extends out of the transparent cover (12) and is in transmission connection with a material pushing driving device (14), one end, far away from the discharging barrel (1), of the discharging pipe (10) is communicated with the gas explosion bin (16) through a valve (15), a material stirring opening (17) which is right up and down relative to the spiral shaft (8) is formed in the material supporting plate (6), a U-shaped groove body (18) is connected below the material stirring opening (17), the spiral shaft (8) is suspended in the U-shaped groove body (18), and two ends of the U-shaped groove body (18) are respectively in sealing connection with the inner side wall of the discharging barrel (1) and are respectively connected with the first positioning pipe (9), Discharging pipe (10) intercommunication, mutually independent material chamber (19) and pressure balance chamber (20) are cut apart into with the space in the discharge barrel (1) jointly to U-shaped cell body (18) and asks flitch (6), material chamber (19) are located and ask flitch (6) and U-shaped cell body (18) top, pressure balance chamber (20) are located and ask flitch (6) and U-shaped cell body (18) below, be connected with intake pipe (21) and blow off pipe (22) with pressure balance chamber (20) intercommunication on discharge barrel (1).

2. A screw type pressure discharger according to claim 1, wherein a tapered buffer tube (23) is attached to the upper opening of the discharge vessel (1), the buffer tube (23) extends upward, the upper end of the buffer tube (23) is provided with the feed opening (24), and the inner diameter of the lower end of the buffer tube (23) is larger than the inner diameter of the upper end.

3. A screw-type pressure discharger according to claim 1, wherein a support (25) is connected to a side of the transparent cover (12) facing away from the discharge cylinder (1), two bearing seats (26) are fixedly connected to the support (25), a portion of the transmission shaft (13) located outside the transparent cover (12) is rotatably connected to the two bearing seats (26), one end of the transmission shaft (13) remote from the screw shaft (8) passes through the two bearing seats (26) and is then drivingly connected to the material pushing drive device (14), the material pushing drive device (14) is fixedly connected to the support (25) through a connecting seat (27), a first water throwing disc (28) is fixedly connected to the transmission shaft (13), and the first water throwing disc (28) is located outside the transparent cover (12).

4. A spiral pressure discharger according to claim 1, wherein a sleeve (29) is vertically connected to the inside of the shaft hole (3) at the center of the base plate (2), a cooling water tank (30) is formed in the inner circumference of the sleeve (29), a second positioning tube (31) is inserted into the sleeve (29), the upper end of the second positioning tube (31) penetrates through the retainer plate (6) and is hermetically connected with the retainer plate (6), the material pulling shaft (4) is rotatably connected to the inside of the second positioning tube (31), the inner wall of the lower portion of the second positioning tube (31) is radially recessed to form a packing cavity (32), packing (33) is arranged in the packing cavity (32), a gland (34) is sleeved on the material pulling shaft (4) and the upper end of the gland (34) is inserted into the packing cavity (32) from the lower end of the second positioning tube (31) and tightly abuts against the packing (33), and the gland (34) is fixedly connected to the lower end of the sleeve (29) through a bolt, fixedly connected with second gets rid of water dish (35) on stirring material axle (4) of gland (34) below, positioning seat (36) have been cup jointed on stirring material axle (4) of second get rid of water dish (35) lower part, positioning seat (36) through being located stirring material axle (4) many vertical settings around connecting rod (37) and bottom plate (2) fixed connection, stir material drive arrangement (5) fixed connection on positioning seat (36), bottom plate (2) and sleeve pipe (29) inside be provided with cooling channel (38) that cooling trough (30) communicate, cooling water entry (39) and cooling water export (40) have been seted up to bottom plate (2) side.

5. A screw-type pressure discharger according to claim 1 wherein a plurality of anti-slip strips extending in an axial direction of the U-shaped groove are uniformly distributed on an inner side wall of the U-shaped groove.