CN214914048U

CN214914048U - Explosion-proof structure of pre-filter

Info

Publication number: CN214914048U
Application number: CN202120144011.2U
Authority: CN
Inventors: 游浩; 王凯
Original assignee: Haining Meikang Environmental Protection Technology Co ltd
Current assignee: Haining Meikang Environmental Protection Technology Co ltd
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2021-11-30
Anticipated expiration: 2031-01-19

Abstract

The utility model relates to a leading filter explosion-proof construction. It has solved the not good problem of leading filter safety in the prior art. The axial movement is adopted to penetrate through a movable valve rod arranged on a valve rod seat at the lower end of a filter shell, axial one-way limiting is realized between the valve rod seat and the movable valve rod, the lower end of the movable valve rod penetrates through a sewage outlet of the filter shell, the lower end of the movable valve rod is provided with a sewage discharge plug capable of sealing the lower end of the sewage outlet, and an elastic jacking explosion-proof mechanism capable of enabling the movable valve rod to keep moving upwards so as to enable the sewage discharge plug to keep being sealed in a sewage outlet state is arranged between the upper end of the movable valve rod and the valve rod seat. The utility model has the advantages that: can realize automatic and quick pressure relief, and effectively avoid the rupture of the front filter caused by overlarge water pressure.

Description

Explosion-proof structure of pre-filter

Technical Field

The utility model relates to a filter technical field, concretely relates to leading filter explosion-proof construction.

Background

The pre-filter is the first coarse filter equipment for the water used in the whole house, is generally arranged at the front end of a pipeline and is mainly used for filtering large granular substances such as silt, rust and the like in tap water. The preposed filter on the market at present has a complex structure and a single function, is not provided with a water quantity control plate, cannot reduce the water pressure flowing into the filter body, and is easy to damage a filter element after long-term use; the sewage discharge switch cannot be controlled, the water outlet switch is controlled at the same time, and sewage possibly flows into the water outlet to pollute the water outlet when the filter element body is cleaned; meanwhile, in the daily use process of the pre-filter, the situation of large instantaneous water flow can occur, large water pressure is generated, when the water pressure reaches the extreme value borne by the filter element, if rapid and real-time pressure relief cannot be realized, the filter element is easy to burst, the safety is poor, and the service life of the pre-filter is easy to influence.

In order to solve the defects of the prior art, people have long searched for and put forward various solutions. For example, the chinese patent document discloses an adjustable pressure-reducing explosion-proof pre-filter [ CN201721110497.8], which comprises a horizontal water outlet pipe, wherein one end of the horizontal water outlet pipe is provided with a water inlet, and the other end of the horizontal water outlet pipe is provided with a water outlet, a KS02Y microcontroller is arranged above the horizontal water outlet pipe, a first water quantity control plate, a second water quantity control plate and a third water quantity control plate are arranged inside the water inlet, the first water quantity control plate is positioned at one side of the second water quantity control plate, the utility model discloses a third water quantity control plate, the second water quantity control plate and the first water quantity control plate are arranged, the second water quantity control plate, the third water quantity control plate and the first water quantity control plate can be rotated to mutually shield the water inlet hole on the surface, the water flow is reduced, the water pressure flowing into the filter body is reduced, and the problem of filter core bursting caused by large water pressure can be effectively avoided, the tap water after being decompressed slowly passes through the filter element body, and the water purification effect of the equipment is improved.

Above-mentioned scheme has solved to a certain extent among the prior art leading filter can't adjust water pressure and influence the problem of water purification effect, but this scheme still has a great deal of not enoughly, for example: when a large water pressure is generated, rapid and real-time pressure relief cannot be realized, so that the filter element is easy to burst, and the safety is poor.

Disclosure of Invention

The utility model aims at the above-mentioned problem, provide a reasonable in design, safe in utilization's leading filter explosion-proof construction.

In order to achieve the above purpose, the utility model adopts the following technical proposal: this leading filter explosion-proof structure, the setting is in the filter housing, this explosion-proof structure includes that axial activity wears to locate the movable valve rod that sets up on the valve stem seat of filter housing lower extreme, and axial one-way spacing between valve stem seat and the movable valve rod, the movable valve rod lower extreme passes filter housing's drain and movable valve rod lower extreme and has and to have the blowdown end cap that can be with drain lower extreme confined, thereby be equipped with between movable valve rod upper end and the valve stem seat and enable the movable valve rod to keep the upward movement trend and make the blowdown end cap keep the elasticity roof pressure explosion-proof device who seals in the drain state. The movable valve rod is arranged on the valve rod seat at the lower end of the filter shell, the elastic jacking explosion-proof mechanism is arranged at the upper end of the movable valve rod, the lower end of the movable valve rod is provided with a sewage discharge plug for plugging a sewage discharge outlet, when the water pressure of the filter shell reaches an extreme value, the acting force of the elastic jacking explosion-proof mechanism is overcome, the movable valve rod is enabled to generate downward displacement to drive the sewage discharge plug to open the sewage discharge outlet, the purpose of rapid and real-time pressure relief is achieved, after pressure relief is completed, the movable valve rod is enabled to reset upwards due to the acting force of the elastic jacking explosion-proof mechanism, the sewage discharge outlet is enabled to be closed again due to the sewage discharge plug, and the use is safe.

In the above-mentioned explosion-proof structure of the prefilter, the elastic jacking explosion-proof mechanism includes an explosion-proof spring sleeved on the circumferential outer side of the upper end of the movable valve rod, and one end of the explosion-proof spring is abutted against the spring limit part detachably mounted on the upper end of the movable valve rod, and the other end of the explosion-proof spring is abutted against the valve rod seat. The movable valve rod keeps the upward movement trend through the explosion-proof spring, the movable valve rod is quickly reset after pressure relief is facilitated, and when the water pressure applied to the movable valve rod is greater than the acting force of the explosion-proof spring, the movable valve rod moves downwards and drives the sewage discharge plug to synchronously move to open the sewage discharge outlet.

In the explosion-proof structure of the pre-filter, the diameter of the spring limiting part is larger than that of the movable valve rod, the spring limiting part is connected with the movable valve rod in a threaded manner, and the upper end surface of the spring limiting part and the end surface of the end, connected with the movable valve rod, of the sewage discharge plug form a stress surface respectively. The movable valve rod is pressed downwards by the pressure of the stress surface.

In foretell prefilter explosion-proof construction, the drain lower extreme is connected with the blowdown and connects, and has the sewage pipes who is linked together with the drain in the blowdown connects, and the diameter size of sewage pipes is greater than the diameter size of drain, and blowdown end cap integrated into one piece is in movable valve stem lower extreme, and in the blowdown end cap extended to the sewage pipes. The filter shell is beneficial to quick pressure relief, so that water flow in the filter shell is quickly discharged, and the water discharge is increased.

In the explosion-proof structure of the pre-filter, the diameter of the pollution discharge plug is equal to that of the pollution discharge outlet, a pollution discharge sealing ring groove is arranged on the outer side of the circumference of the pollution discharge plug, and a pollution discharge sealing ring body abutting against the lower end of the pollution discharge outlet is arranged in the pollution discharge sealing ring groove; or the diameter of the sewage discharge plug is larger than that of the sewage discharge port, a plug limiting step is formed between the sewage discharge port and the sewage discharge channel, and the upper end of the sewage discharge plug abuts against the sewage discharge limiting step. The arrangement can lead the pollution discharge plug to seal the sewage discharge outlet more tightly.

In the explosion-proof structure of the pre-filter, the circumferential inner sides of the upper end and the lower end of the sewage draining port are respectively provided with an annular sewage draining inclined plane, the circumferential inner sides of the upper end and the lower end of the sewage draining plug are respectively provided with an annular guide inclined plane, and the annular sewage draining inclined plane at the lower end of the sewage draining port is matched with the annular guide inclined plane at the upper end of the sewage draining plug.

In the above-mentioned leading filter explosion-proof structure, have at least one valve rod hole on the valve rod seat, and the activity valve rod activity is worn to locate in the valve rod hole, has at least one valve rod spacing portion that leans on with valve rod hole lower extreme counterbalance outside the activity valve rod week.

In foretell leading filter explosion-proof construction, the filter shell has the filter core barrel in the casing, the valve rod seat is for forming the filter core base in filter core barrel lower extreme, filter core base lower extreme has the disk seat tube-shape portion that is linked together with the valve rod hole, the internal diameter size of disk seat tube-shape portion is greater than the diameter size in valve rod hole, and form the spacing step of valve rod between disk seat tube-shape portion circumference inboard and the filter core base lower extreme face, the movable valve rod is last to have two spacing portions of valve rod, and one of them spacing portion of valve rod supports and leans on the spacing step of valve rod, the spacing portion of remaining one valve rod supports and leans on the terminal surface under the disk seat tube-shape portion. The movable valve rod is limited by the mutual abutting of the valve rod limiting step and the valve seat cylindrical part, so that the sewage discharging plug can accurately plug the sewage discharging port.

In foretell leading filter explosion-proof construction, filter core barrel and filtration support body have in the filter casing, and filter support body cover locates filter core barrel week outside, and the valve stem seat is the filter core base that forms in filter core barrel lower extreme and the support body base of filtering support body lower extreme respectively, and the movable valve pole is worn to locate in proper order from the top down in the valve stem hole on filter core base and the support body base, and the movable valve pole is one-way spacing for filter core base and support body base axial respectively.

In the explosion-proof structure of the front filter, the movable valve rod is provided with two valve rod limiting parts, one of the two valve rod limiting parts is abutted against the circumferential outer side of the lower end of the valve rod hole on the filter element base, the upper end of the filter element base is provided with a valve rod guide cylinder body communicated with the valve rod hole on the filter element base, the movable valve rod is arranged in the valve rod guide cylinder body in a penetrating way, and the remaining valve rod limiting part on the movable valve rod is abutted against the circumferential outer side of the lower end of the valve rod hole on the frame body base. Have two kinds of spacing modes, the installation is more nimble, and the adaptation model is wide.

Compared with the prior art, the utility model has the advantages of: reasonable in design, high durability and convenient use, through set up the movable valve rod on the valve rod seat at filter housing lower extreme, and set up the explosion-proof mechanism of elasticity roof pressure in movable valve rod upper end, the lower extreme sets up the blowdown end cap that is used for the shutoff drain, when filter housing's water pressure reaches the extreme value, overcome explosion-proof spring's effort, thereby make movable valve rod downstream drive blowdown end cap open the drain, realize quick, the purpose of real-time release, after the release is accomplished, because the effort of the explosion-proof mechanism of elasticity roof pressure makes movable valve rod upwards reset, make the blowdown end cap reclose the drain, the safety of daily use has been improved, the service life of filter has been prolonged.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a sectional view of an assembled position in the first embodiment;

FIG. 3 is a schematic view of the bottom structure of the cartridge body of the present invention;

FIG. 4 is a sectional view showing an assembled position in the second embodiment;

fig. 5 is a cross-sectional view of a cartridge body and a filter frame body according to a second embodiment.

In the figure, a filter shell 1, a sewage outlet 11, a sewage connector 12, a sewage channel 13, an annular sewage inclined plane 14, a filter element cylinder 15, a filter element base 16, a valve seat cylinder part 17, a valve rod limiting step 18, a filter frame body 19, a valve rod base 2, a valve rod hole 21, a movable valve rod 3, a sewage plug 31, a sewage sealing ring groove 32, a sewage sealing ring body 321, an annular guiding inclined plane 33, a valve rod limiting part 34, an elastic jacking explosion-proof mechanism 4, an explosion-proof spring 41, a spring limiting part 42, a stress surface 43, a frame body base 5 and a valve rod guiding cylinder body 51.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Example one

As shown in fig. 1-3, the explosion-proof structure of the pre-filter is arranged in a filter housing 1, and comprises a movable valve rod 3 which is axially movably arranged on a valve rod seat 2 arranged at the lower end of the filter housing 1 in a penetrating manner, and an axial one-way limit is arranged between the valve rod seat 2 and the movable valve rod 3, the lower end of the movable valve rod 3 penetrates through a sewage discharge port 11 of the filter housing 1, the lower end of the movable valve rod 3 is provided with a sewage discharge plug 31 which can seal the lower end of the sewage discharge port 11, and an elastic jacking explosion-proof mechanism 4 which can enable the movable valve rod 3 to keep moving upwards so as to enable the sewage discharge plug 31 to keep being sealed in the sewage discharge port 11 state is arranged between the upper end of the movable valve rod 3 and the valve rod seat 2. Through set up movable valve rod 3 on the valve stem seat 2 at 1 lower extreme of filter housing, utilize valve stem seat 2 to carry out one-way spacing to movable valve rod 3, make the blowdown end cap 31 that is located the 3 lower extremes of movable valve rod just form to the drain 11 and seal, when water pressure exceeded 10 kilograms of rivers produced pressure, water pressure overcome the effort of elasticity roof pressure explosion-proof mechanism 4, thereby make movable valve rod 3 move down make blowdown end cap 31 break away from drain 11, and through the release of the 11 quick release rivers reliefs of drain.

The elastic jacking explosion-proof mechanism 4 comprises an explosion-proof spring 41 which is sleeved on the circumferential outer side of the upper end of the movable valve rod 3, one end of the explosion-proof spring 41 is abutted on a spring limiting part 42 which is detachably mounted at the upper end of the movable valve rod 3, and the other end of the explosion-proof spring is abutted on the valve rod seat 2. The extreme pressure of water that explosion-proof spring 41 can bear is equivalent to the pressure of water generated by 10 kilograms of water.

As can be seen, the diameter of the spring limiting portion 42 is larger than the diameter of the movable valve rod 3, the spring limiting portion 42 is connected with the movable valve rod 3 in a threaded manner, and the upper end face of the spring limiting portion 42 and the end face of the end, connected with the movable valve rod 3, of the blowdown choke plug 31 are respectively formed on the stressed surface 43.

Further, the lower end of the sewage draining port 11 is connected with a sewage draining joint 12, a sewage draining channel 13 communicated with the sewage draining port 11 is arranged in the sewage draining joint 12, the diameter of the sewage draining channel 13 is larger than that of the sewage draining port 11, a sewage draining plug 31 is integrally formed at the lower end of the movable valve rod 3, and the sewage draining plug 31 extends into the sewage draining channel 13. By providing a large diameter trapway 13, this is facilitated

Obviously, the diameter of the pollution discharge plug 31 is equal to that of the pollution discharge opening 11, a pollution discharge sealing ring groove 32 is arranged on the circumferential outer side of the pollution discharge plug 31, and a pollution discharge sealing ring body 321 abutting against the lower end of the pollution discharge opening 11 is arranged in the pollution discharge sealing ring groove 32; or the diameter of the sewage discharge plug 31 is larger than that of the sewage discharge port 11, a plug limiting step is formed between the sewage discharge port 11 and the sewage discharge channel 13, and the upper end of the sewage discharge plug 31 abuts against the sewage discharge limiting step. The sewage draining device has two sealing modes, can be freely switched according to the shape of the sewage draining outlet 11, and has good flexibility and good sealing effect.

Specifically, the circumferential inner sides of the upper end and the lower end of the sewage draining port 11 are respectively provided with an annular sewage draining inclined plane 14, the circumferential inner sides of the upper end and the lower end of the sewage draining plug 31 are respectively provided with an annular guide inclined plane 33, and the annular sewage draining inclined plane 14 at the lower end of the sewage draining port 11 is matched with the annular guide inclined plane 33 at the upper end of the sewage draining plug 31. The arrangement of the annular guide inclined plane 33 is convenient for the accurate alignment of the sewage discharge plug 31 when the sewage discharge outlet 11 is closed or opened.

Specifically, the valve stem base 2 has at least one valve stem hole 21, the movable valve stem 3 is movably inserted into the valve stem hole 21, and at least one valve stem stopper 34 abutting against the lower end of the valve stem hole 21 is provided on the outer circumferential side of the movable valve stem 3.

Furthermore, the filter housing 1 has a filter element cylinder 15 therein, the valve rod seat 2 is a filter element base 16 formed at the lower end of the filter element cylinder 15, the lower end of the filter element base 16 is provided with a valve seat cylindrical portion 17 communicated with the valve rod hole 21, the inner diameter of the valve seat cylindrical portion 17 is larger than the diameter of the valve rod hole 21, a valve rod limiting step 18 is formed between the circumferential inner side of the valve seat cylindrical portion 17 and the lower end face of the filter element base 16, the movable valve rod 3 is provided with two valve rod limiting portions 34, one of the valve rod limiting portions 34 abuts against the valve rod limiting step 18, and the other valve rod limiting portion 34 abuts against the lower end face of the valve seat cylindrical portion 17. Support each other through the spacing portion of valve rod 34 and the spacing step 18 of valve rod and lean on spacingly, can ensure that the blowdown end cap 31 can carry out accurate shutoff to drain 11 through spacingly after movable valve rod 31 resets, promptly when the release is accomplished the back, movable valve rod 31 resets because explosion-proof spring 41's effort, supports each other when leaning on between the spacing portion of valve rod 34 and the spacing step 18 of valve rod when, and blowdown end cap 31 just accomplishes the closure to drain 11.

Preferably, filter core barrel 15 and filtration support body 19 have in the filter housing 1, and filter support body 19 cover locates the 15 circumference outsides of filter core barrel, and valve rod seat 2 is respectively for forming in the filter core base 16 of filter core barrel 15 lower extreme and filtering support body base 5 of 19 lower extremes of support body, in the valve rod hole 21 on filter core base 16 and the support body base 5 is worn to locate in proper order downwards from the top in movable valve rod 3, and movable valve rod 3 is one-way spacing for filter core base 16 and support body base 5 axial respectively.

Example two

As shown in fig. 4-5, the principle of this embodiment is the same as that of the first embodiment, except that: the movable valve rod 3 is provided with two valve rod limiting parts 34, one of the valve rod limiting parts 34 is abutted against the circumferential outer side of the lower end of the valve rod hole 21 on the filter element base 16, the upper end of the filter element base 16 is provided with a valve rod guide cylinder body 51 communicated with the valve rod hole 21 on the filter element base 16, the movable valve rod 3 is arranged in the valve rod guide cylinder body 51 in a penetrating way, and the remaining valve rod limiting part 34 on the movable valve rod 3 is abutted against the circumferential outer side of the lower end of the valve rod hole 21 on the frame base 5.

The principle of the embodiment is as follows: during daily use, blowdown end cap 31 seals drain 11, when water pressure reaches the extreme value, stress surface 43 atress makes movable valve rod 3 overcome explosion-proof spring 41's effort downstream, thereby drive the blowdown end cap 31 synchronous movement of shutoff in drain 11 department to sewage pipes 13, open drain 11 from this and release rivers release, after the release is accomplished, because explosion-proof spring 41 makes movable valve rod 3 have upward movement's trend, therefore, movable valve rod 3 resets, and because the spacing of mutual support of valve rod spacing portion 34 and valve rod spacing step 18 is spacing, can guarantee that blowdown end cap 31 can carry out accurate shutoff to drain 11 after movable valve rod 31 resets, promptly support when leaning on each other between valve rod spacing portion 34 and the valve rod spacing step 18, blowdown end cap 31 just accomplishes the closure to drain 11. Automatic pressure relief is realized, the operation is rapid and thorough, and the safety of daily use of the front filter is improved.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the terms of the filter housing 1, the sewage draining outlet 11, the sewage draining joint 12, the sewage draining channel 13, the annular sewage draining inclined plane 14, the filter element cylinder 15, the filter element base 16, the valve seat cylinder 17, the valve rod limiting step 18, the filter frame body 19, the valve rod base 2, the valve rod hole 21, the movable valve rod 3, the sewage draining plug 31, the sewage draining sealing ring groove 32, the sewage draining sealing ring body 321, the annular guiding inclined plane 33, the valve rod limiting part 34, the elastic jacking explosion-proof mechanism 4, the explosion-proof spring 41, the spring limiting part 42, the stress surface 43, the frame body base 5, the valve rod guiding cylinder 51 and the like are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The utility model provides a leading filter explosion-proof structure, sets up in filter housing (1), its characterized in that, this explosion-proof structure includes that axial activity wears to locate movable valve rod (3) of setting on valve rod seat (2) of filter housing (1) lower extreme, just valve rod seat (2) and movable valve rod (3) between the one-way spacing of axial, movable valve rod (3) lower extreme pass drain (11) and movable valve rod (3) lower extreme of filter housing (1) and have and to have can be with drain (11) lower extreme confined blowdown end cap (31), thereby movable valve rod (3) upper end and valve rod seat (2) between be equipped with and enable movable valve rod (3) and keep upward movement trend to make blowdown end cap (31) keep sealing in elasticity roof pressure explosion-proof structure (4) of drain (11) state.

2. The explosion-proof structure of the prefilter of claim 1 wherein said elastic pressing explosion-proof mechanism (4) comprises an explosion-proof spring (41) sleeved on the circumferential outer side of the upper end of the movable valve rod (3), and one end of said explosion-proof spring (41) is abutted against a spring limit part (42) detachably mounted on the upper end of the movable valve rod (3), and the other end is abutted against the valve rod seat (2).

3. The explosion-proof structure of the prefilter of claim 2 wherein the diameter of the spring-retaining portion (42) is greater than the diameter of the movable valve stem (3), the spring-retaining portion (42) is connected with the movable valve stem (3) in a threaded manner, and the upper end face of the spring-retaining portion (42) and the end face of the end of the movable valve stem (3) to which the drain plug (31) is connected are respectively formed on the stressed surface (43).

4. The explosion-proof structure of the prefilter of claim 1 or 2 or 3 wherein the lower end of the sewage outlet (11) is connected with a sewage connector (12), and a sewage channel (13) communicated with the sewage outlet (11) is arranged in the sewage connector (12), the diameter of the sewage channel (13) is larger than that of the sewage outlet (11), the sewage plug (31) is integrally formed at the lower end of the movable valve rod (3), and the sewage plug (31) extends into the sewage channel (13).

5. The explosion-proof structure of the prefilter of claim 4 wherein the diameter of the blowdown choke plug (31) is equal to the diameter of the sewage outlet (11), and a blowdown sealing ring groove (32) is arranged at the circumferential outer side of the blowdown choke plug (31), and a blowdown sealing ring body (321) abutting against the lower end of the sewage outlet (11) is arranged in the blowdown sealing ring groove (32); or the diameter of the sewage discharge plug (31) is larger than that of the sewage discharge port (11), a plug limiting step is formed between the sewage discharge port (11) and the sewage discharge channel (13), and the upper end of the sewage discharge plug (31) abuts against the sewage discharge limiting step.

6. The explosion-proof structure of the prefilter of claim 5 wherein the circumferential inner sides of the upper and lower ends of the sewage drain opening (11) are respectively provided with an annular sewage draining inclined plane (14), the circumferential inner sides of the upper and lower ends of the sewage draining choke plug (31) are respectively provided with an annular guiding inclined plane (33), and the annular sewage draining inclined plane (14) at the lower end of the sewage drain opening (11) is matched with the annular guiding inclined plane (33) at the upper end of the sewage draining choke plug (31).

7. The explosion-proof structure of the prefilter of claim 1 wherein the valve stem seat (2) has at least one valve stem hole (21), and the movable valve stem (3) is movably inserted into the valve stem hole (21), and the outer side of the circumference of the movable valve stem (3) has at least one valve stem limiting part (34) abutting against the lower end of the valve stem hole (21).

8. Front filter bursting as claimed in claim 7 in which the filter housing (1) has a cartridge cylinder (15) therein, the valve rod seat (2) is a filter element base (16) formed at the lower end of the filter element cylinder body (15), the lower end of the filter element base (16) is provided with a valve seat cylindrical part (17) communicated with the valve rod hole (21), the inner diameter of the valve seat cylindrical part (17) is larger than the diameter of the valve rod hole (21), and a valve rod limiting step (18) is formed between the circumferential inner side of the valve seat cylindrical part (17) and the lower end surface of the filter element base (16), the movable valve rod (3) is provided with two valve rod limiting parts (34), one valve rod limiting part (34) is abutted against the valve rod limiting step (18), and the other valve rod limiting part (34) is abutted against the lower end face of the valve seat cylindrical part (17).

9. The explosion-proof structure of leading filter of claim 7, characterized in that, filter housing (1) in have filter core barrel (15) and filter support body (19), just filter support body (19) cover locate filter core barrel (15) circumference outside, just valve rod seat (2) respectively for forming in filter core base (16) of filter core barrel (15) lower extreme and filter support body (19) support body base (5) of lower extreme, movable valve rod (3) from the top down wear to locate in filter core base (16) and the valve rod hole (21) on support body base (5) in proper order, just movable valve rod (3) respectively for filter core base (16) and support body base (5) axial one-way spacing.

10. The explosion-proof structure of the front filter according to claim 9, wherein the movable valve rod (3) is provided with two valve rod limiting parts (34), one of the valve rod limiting parts (34) abuts against the outer side of the circumferential direction of the lower end of the valve rod hole (21) on the filter element base (16), the upper end of the filter element base (16) is provided with a valve rod guide cylinder body (51) communicated with the valve rod hole (21) on the filter element base (16), the movable valve rod (3) penetrates through the valve rod guide cylinder body (51), and the remaining one valve rod limiting part (34) on the movable valve rod (3) abuts against the outer side of the circumferential direction of the lower end of the valve rod hole (21) on the frame base (5).