CN210068443U

CN210068443U - Pneumatic diaphragm pump

Info

Publication number: CN210068443U
Application number: CN201920768275.8U
Authority: CN
Inventors: 叶晓华
Original assignee: Shanghai Xia Feibeng Industry Co Ltd
Current assignee: Shanghai Xia Feibeng Industry Co Ltd
Priority date: 2019-05-25
Filing date: 2019-05-25
Publication date: 2020-02-14
Anticipated expiration: 2029-05-25

Abstract

The utility model relates to a pneumatic diaphragm pump, including the pump body and set up in the scavenge valve at pump body middle part, the scavenge valve includes the switching-over valve case, the switching-over valve case middle part has seted up movable chamber along switching-over valve case axis direction, it is connected with the piston to slide along activity chamber axis direction in the activity intracavity, the both ends of switching-over valve case all are provided with the switching-over valve chock plug, the switching-over valve chock plug is located movable chamber tip valve gap including inserting, the logical groove that can run through the fixed lid both sides is seted up along the direction of perpendicular to fixed lid axis in the valve gap middle part, the slot that runs through the switching-over valve case is all seted up along the axis direction of perpendicular to switching-over valve case in the both ends of switching-over valve case, the slot can communicate with leading to the groove, the. The utility model discloses have the probability that can reduce the sealing plug pine and take off, guarantee the effect of the normal work of pneumatic diaphragm pump.

Description

Pneumatic diaphragm pump

Technical Field

The utility model belongs to the technical field of the technique of diaphragm pump and specifically relates to a pneumatic diaphragm pump is related to.

Background

The pneumatic diaphragm pump is a novel pump in China at present, adopts compressed air as a power source, and can completely suck various corrosive liquids, liquids with particles, high viscosity, high toxicity and the like. The pneumatic diaphragm pump has four materials: plastic, aluminum alloy, cast iron, stainless steel. The diaphragm pump can adopt different colloids according to the requirements of different users. Pumping media that cannot be pumped by various conventional pumps. The middle pump body of the currently used pneumatic diaphragm pump is generally large in size, high in production cost, not compact in structure and complex in structures of the air interchanger and the air inlet device.

The existing referenceable authorization publication numbers are: CN203516023U, which discloses a pneumatic diaphragm pump, comprising two diaphragm chambers, a scavenging valve, an exhaust hood and a pilot valve. The two diaphragm cavities are fixed on two sides of the scavenging valve; the air exchange valve block comprises an air valve main body, a ring, a movable shaft, a sealing plug and an air exchange valve block; the ring, the movable shaft, the sealing plug and the ventilation valve block are fixed on the air valve main body; the two diaphragm cavities are provided with plastic gaskets, sleeves, duckbill valves and ring rings; the exhaust hood is provided with a sponge, an exhaust rear cover and a rubber sealing sheet; the pilot valve is provided with a movable rod, a gasket, a ring and a spacer. The utility model has the advantages that: the structure is simple and reliable, the production process is simple, the compressed air is adopted as a power source, energy is saved, the environment is protected, the leakage is not easy to occur, and various strong liquid granular solids can be conveyed and pumped out.

The above prior art solutions have the following drawbacks: the one end of foretell pneumatic diaphragm pump's scavenge valve adopts sealed stopper to carry on spacingly to the tip of loose axle, but in the course of the work, the loose axle will be continuous along the axis direction reciprocating motion of scavenge valve main part to lead to the continuous impact of tip of loose axle sealed stopper, thereby can lead to sealed stopper to produce the condition of pine taking off, influence the leakproofness of scavenge valve main part, from what influences the normal work of pneumatic diaphragm pump.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a pneumatic diaphragm pump can reduce the probability that the sealing plug pine takes off, guarantees the normal work of pneumatic diaphragm pump.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

a pneumatic diaphragm pump comprises a pump body and a scavenging valve arranged in the middle of the pump body, wherein the scavenging valve comprises a reversing valve shell, a movable cavity is arranged in the middle of the reversing valve shell along the axial direction of the reversing valve shell, a piston is connected in the movable cavity in a sliding manner along the axial direction of the movable cavity, two ends of the reversing valve shell are respectively provided with a reversing valve plug head, the reversing valve plug head comprises a valve cover inserted in the end part of the movable cavity, the middle part of the valve cover is provided with a through groove which can penetrate through the two sides of the fixed cover along the direction vertical to the axis of the fixed cover, two ends of the reversing valve shell are both provided with slots penetrating through the reversing valve shell along the direction vertical to the axis of the reversing valve shell, the slot can communicate with logical groove, the both ends of switching-over valve casing still all are provided with one and can adopt interference fit's connected mode to insert the switching-over valve chock plug fixed plate of locating in slot and logical inslot.

Through adopting above-mentioned technical scheme, through adopting insert locate slot and logical inslot and adopt interference fit's switching-over valve plug fixed plate can be fixed in the switching-over valve casing with the switching-over valve plug, and then can reduce the not hard up possibility of switching-over valve plug to the firm both ends that are fixed in the switching-over valve casing of switching-over valve plug.

The utility model discloses further set up to: the slot is the same with the aperture that leads to the groove, and each side homoenergetic butt in each inside wall that leads to the groove of switching-over valve plug fixed plate.

Through adopting above-mentioned technical scheme, can guarantee the inseparable butt of switching-over valve plug fixed plate and slot and logical groove, from the firm fixed of guaranteeing switching-over valve case and valve gap.

The utility model discloses further set up to: the reversing valve plug head further comprises an insert sleeve fixedly connected to one side, close to each other, of the valve cover and inserted into the movable cavity, and the insert sleeve is in sealing butt joint with the inner side of the movable cavity.

Through adopting above-mentioned technical scheme, plug bush through adopting and the inboard butt in activity chamber to can realize the sealed at activity chamber both ends, thereby can prevent revealing.

The utility model discloses further set up to: the circumferential surface of the plug bush is provided with an annular groove, and a sealing ring which can be abutted against the inner side of the movable cavity is arranged in the annular groove.

Through adopting above-mentioned technical scheme, can be further sealed between the movable chamber of plug bush and switching-over valve casing through the sealing ring that adopts to prevent that the movable chamber from revealing from the valve gap at both ends.

The utility model discloses further set up to: keep away from the slot outside of bottom plate one side and all seted up first guide way.

The first guide groove can be convenient for the reversing valve plug fixing plate to be inserted into the slot, and the reversing valve plug fixing plate is easy to operate and convenient to use.

The utility model discloses further set up to: and the side surfaces of the two ends of the through groove are provided with second guide grooves.

Through adopting above-mentioned technical scheme, the second guide way through adopting can just change over valve plug fixed plate and insert and locate logical inslot, convenient to use, easy operation.

The utility model discloses further set up to: the outer side of the valve cover is recessed in the end face of the reversing valve shell by 0.1-0.3 mm.

Through adopting above-mentioned technical scheme, through the valve gap outside recess in the switching-over valve casing terminal surface that adopts, reduce the collision of external object to the valve gap to protect the valve gap, prolong the life of valve gap.

The utility model discloses further set up to: the outer peripheral surface of the valve cover is in threaded connection with the reversing valve shell.

Through adopting above-mentioned technical scheme, through the outer peripheral face threaded connection of the valve gap that adopts in the switching-over valve casing relegate insert locate the switching-over valve chock plug fixed plate in the slot can realize mutual locking, can further prevent that the valve gap from breaking away from the switching-over valve casing, guarantee the stable connection of valve gap.

The utility model discloses further set up to: a plurality of jacks are formed in the outer side of the valve cover.

The jack that adopts can convenient to use person rotate the valve gap, the opening or closing of the valve gap of being convenient for, convenient to use, easy operation.

The utility model discloses further set up to: the positions of the reversing valve shell corresponding to the two ends of the movable cavity are provided with conical guide rings.

By adopting the technical scheme, the guide ring can facilitate the valve cover to be inserted into the two ends of the movable cavity, so that the valve cover and the reversing valve shell can be conveniently installed, and the use is convenient.

To sum up, the utility model discloses a beneficial technological effect does:

1. the reversing valve plug can be fixed in the reversing valve shell by the reversing valve plug fixing plate which is inserted in the slot and the through slot and is in interference fit, so that the reversing valve plug can be firmly fixed at two ends of the reversing valve shell, and the possibility of looseness of the reversing valve plug is reduced;

2. the plug bush is abutted against the inner side of the movable cavity, so that the two ends of the movable cavity can be sealed, and leakage can be prevented;

3. through the sealing ring that adopts can be further sealed between the movable chamber of plug bush and switching-over valve casing to prevent that the movable chamber from revealing from the valve gap at both ends.

Drawings

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

Fig. 2 is an exploded view of the structure of the reversing valve housing of the present invention.

Fig. 3 is a schematic view of the valve core structure of the present invention.

Fig. 4 is an enlarged view of a portion a in fig. 3.

In the figure, 1, a pump body; 2. a scavenging valve; 21. a diverter valve housing; 211. a movable cavity; 2111. a limiting ring; 212. an air inlet; 213. an air guide port; 214. a guide ring; 215. a slot; 2151. a first guide groove; 22. a pilot valve plate; 221. a vent; 23. a pilot valve slide block; 24. a piston; 241. a positioning ring; 242. a sealing groove; 243. a seal ring; 25. a reversing valve plug; 251. a valve cover; 2511. a jack; 2512. a through groove; 2513. a second guide groove; 2514. a cushion pad; 252. inserting a sleeve; 2521. an airway; 2522. chamfering; 2523. an annular groove; 2524. a seal ring; 26. a reversing valve plug fixing plate; 3. a base plate.

Detailed Description

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

Referring to fig. 1, for the utility model discloses a pneumatic diaphragm pump, including the pump body 1, the pump body 1 includes two diaphragm chambeies. A scavenging valve 2 is vertically and fixedly connected with the pump body 1 at a position corresponding to the space between the two diaphragm cavities.

Referring to fig. 2 and 3, the scavenging valve 2 includes the reversing valve casing 21 and sets up in the reversing valve casing 21 and is close to the bottom plate 3 of the pump body 1 one side, movable chamber 211 has been seted up along the axis direction of reversing valve casing 21 in the middle part of reversing valve casing 21, reversing valve casing 21 corresponds movable chamber 211 and has been close to the one side of keeping away from bottom plate 3 and seted up air inlet 212, air guide port 213 has been seted up respectively at one side both ends that are close to bottom plate 3 in movable chamber 211, movable chamber 211 is close to one side middle part position fixedly connected with pilot valve plate 22 of bottom plate 3, three vent 221 has been seted up along the axis. A pilot valve slide block 23 capable of moving along the axial direction of the movable cavity 211 is arranged in the movable cavity 211 corresponding to the upper side of the pilot valve plate 22, and the pilot valve slide block 23 can move along the axial direction of the movable cavity 211 to complete the communication between the two side air ports 221 and the middle air port 221.

Be provided with piston 24 in the activity chamber 211, piston 24 can slide along the axis direction in activity chamber 211, piston 24's middle part is provided with two holding rings 241, the both sides of pilot valve slider 23 can butt in the one side that holding ring 241 is close to each other, and the downside of pilot valve slider 23 can butt in the one side that activity chamber 211 is close to bottom plate 3, when piston 24 slides along activity chamber 211, holding ring 241 through piston 24 can drive pilot valve slider 23 and remove, thereby make pilot valve slider 23 accomplish the intercommunication respectively of both sides blow vent 221 and middle part blow vent 221.

The diameter of one end of the piston 24 is 1.3-1.5 times the diameter of the other end. The reversing valve case 21 is also provided with reversing valve plugs 25 at positions corresponding to the two ends of the movable cavity 211, each reversing valve plug 25 comprises a valve cover 251, one ends, close to each other, of the valve covers 251 can be inserted into the end of the movable cavity 211, the peripheral surfaces of the valve covers 251 are in threaded connection with the end of the movable cavity 211, the valve covers 251 are installed at the two ends of the reversing valve case 21, and the outer side surfaces of the valve covers 251 are recessed in the end surfaces of the reversing valve case 21 by 0.1-0.3 mm. The reversing valve housing 21 is provided with tapered guide rings 214 at positions corresponding to the two ends of the movable cavity 211, and the valve cover 251 can be conveniently inserted into the end of the movable cavity 211 through the guide rings 214. In order to facilitate the rotation of the valve cap 251, the valve cap 251 is installed in the reversing valve housing 21, and a plurality of insertion holes 2511 are formed on the outer side of the valve cap 251.

The middle part of valve gap 251 still sets up the logical groove 2512 that can run through valve gap 251 both sides along the direction of perpendicular to valve gap 251 axis, and the slot 215 that extends to activity chamber 211 is all seted up towards the direction in activity chamber 211 to the both sides that the both ends of switching-over valve casing 21 are close to and keep away from bottom plate 3, and two slots 215 of switching-over valve casing 21 one end all can communicate with the logical groove 2512 of valve gap 251. The slot 215 and the through slot 2512 are rectangular slots, and the length and the width of the slot 215 and the through slot 2512 are the same. The two ends of the reversing valve housing 21 are also provided with a reversing valve plug fixing plate 26 which can be inserted into the slot 215 and the through slot 2512, and each side of the reversing valve plug fixing plate 26 can be abutted against each side of the slot 215 and inserted into the through slot 2512 in an interference fit connection mode. The bottom plate 3 is bolted to one side of the reversing valve housing 21, and one end of the reversing valve plug head fixing plate 26 can abut against the bottom plate 3. In order to facilitate the insertion of the plug head fixing plate 26 in the slot 215 and the through slot 2512, the outer side of the slot 215 on the side far away from the bottom plate 3 is provided with a first guide groove 2151, and the side surfaces of the two ends of the through slot 2512 are provided with second guide grooves 2513. Through the adoption insert locate slot 215 and through groove 2512 in the switching-over valve cock head fixed plate 26 can be fixed in switching-over valve casing 21 with switching-over valve cock head 25, prevent that switching-over valve cock head 25 from removing, the interference fit of adoption can prevent that switching-over valve cock head fixed plate 26 from moving, and then can be with the firm both ends that are fixed in switching-over valve casing 21 of switching-over valve cock head 25, the outer peripheral face threaded connection of valve gap 251 that adopts in addition is in switching-over valve casing 21 deuterogamy insert the switching-over valve cock head fixed plate 26 of locating in slot 215 and can realize locking each other, can further prevent that valve gap 251 from breaking away from on switching-over valve casing 21, guarantee the.

Referring to fig. 2 and 4, plug sleeves 252 capable of being inserted into the movable cavity 211 are further fixedly connected to the sides of the valve cap 251 adjacent to each other, and air passages 2521 capable of communicating with the interior of the plug sleeves 252 are formed at positions of the plug sleeves 252 corresponding to the two air guide openings 213. A chamfer 2522 is formed at the outer side of one end, close to each other, of the plug bush 252, so that the plug bush 252 can be conveniently arranged in the movable cavity 211, the two ends of the inner side of the movable cavity 211 of the reversing valve shell 21 are also fixedly connected with limit rings 2111, and one end, close to each other, of the plug bush 252 can abut against the limit rings 2111. A plurality of annular grooves 2523 are formed in the outer peripheral surface of the sleeve 252, sealing rings 2524 are accommodated in the annular grooves 2523, the outer sides of the sealing rings 2524 can be abutted against the inner sides of the movable cavity 211, and the sleeve 252 and the movable cavity 211 of the reversing valve housing 21 can be further sealed by the sealing rings 2524, so that the movable cavity 211 is prevented from leaking from the valve covers 251 at the two ends.

Both ends of the piston 24 can be respectively inserted into the insertion sleeves 252 of the two reversing valve plugs 25, and both ends of the piston 24 can slide in the insertion sleeves 252 along the axial direction of the insertion sleeves 252. An annular seal groove 242 is further formed in the circumferential surface of each end of the piston 24, a seal ring 243 is accommodated in each seal groove 242, the seal ring 243 is a lip seal 243, the lips of the two lip seals 243 are opposite, and the outer side of the seal ring 243 can abut against the inner side of the insert sleeve 252. The side of the valve cover 251 close to each other is also fixedly connected with a buffer 2514. The sealing performance between the two ends of the piston 24 and the plug 252 can be enhanced through the adopted sealing ring 243, the stable operation of the reversing valve is ensured, and when the piston 24 slides in the movable cavity 211, the impact of the piston 24 on the valve cover 251 can be reduced through the adopted buffering cushion 2514, and the valve cover 251 is protected.

The implementation principle of the embodiment is as follows: the reversing valve plug head 25 can be fixed in the reversing valve housing 21 through the reversing valve plug head fixing plate 26 inserted in the slot 215 and the through slot 2512, the reversing valve plug head 25 is prevented from moving, the reversing valve plug head fixing plate 26 can be limited through interference fit, the reversing valve plug head fixing plate 26 can be prevented from moving, the reversing valve plug head 25 can be firmly fixed at two ends of the reversing valve housing 21, in addition, the reversing valve plug head is connected to the reversing valve housing 21 through the outer peripheral surface of the valve cover 251 in a threaded mode, and then the reversing valve plug head fixing plate 26 inserted in the slot 215 is matched to realize mutual locking, so that the valve cover 251 can be further prevented from being separated from the reversing valve housing 21, and stable connection of the valve cover 251 is ensured; in addition, when the piston 24 slides in the movable cavity 211, both ends of the piston 24 can slide in the two movable sleeves, so that friction between both ends of the piston 24 and the reversing valve housing 21 is avoided, and when both ends of the piston 24 wear the inner side walls of the two movable sleeves, the two reversing valve plugs 25 are detached from both ends of the reversing valve housing 21 to replace the new reversing valve plugs 25, so that the waste for replacing the whole reversing valve housing 21 is low, and the operation is simple; secondly, the diameter of one end of the piston 24 is larger than that of the other end of the piston 24, so that the mass of one end of the piston 24 is larger than that of the other end of the piston, the balance of the two ends of the piston 24 can be broken, and when the piston 24 just stays at the dead point position, the dead point position can be automatically overcome by the end with larger mass of the piston 24, and the normal movement of the movable valve is further ensured.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A pneumatic diaphragm pump comprises a pump body (1) and a scavenging valve (2) arranged in the middle of the pump body (1), wherein the scavenging valve (2) comprises a reversing valve shell (21), the middle of the reversing valve shell (21) is provided with a movable cavity (211) along the axial direction of the reversing valve shell (21), the movable cavity (211) is connected with a piston (24) in a sliding manner along the axial direction of the movable cavity (211), the pneumatic diaphragm pump is characterized in that reversing valve plugs (25) are arranged at two ends of the reversing valve shell (21), each reversing valve plug (25) comprises a valve cover (251) inserted into the end of the movable cavity (211), a through groove (2512) capable of penetrating through two sides of the valve cover (251) is formed in the middle of the valve cover (251) along the direction perpendicular to the axial direction of a fixed cover, and slots (215) penetrating through the reversing valve shell (21) are formed in two ends of the reversing valve shell (21) along the, the slot (215) can communicate with the through groove (2512), the both ends of the reversing valve casing (21) are provided with a reversing valve plug fixing plate (26) which can be inserted into the slot (215) and the through groove (2512) in an interference fit connection mode, and the lower side of the reversing valve casing (21) is connected with a bottom plate (3) which can be abutted to the lower ends of the two reversing valve plug fixing plates (26) through bolts.

2. An air operated diaphragm pump according to claim 1, wherein: the diameter of the slot (215) is the same as that of the through groove (2512), and each side surface of the reversing valve plug head fixing plate (26) can be abutted against each inner side wall of the through groove (2512).

3. An air operated diaphragm pump according to claim 1, wherein: the reversing valve plug head (25) further comprises an inserting sleeve (252) fixedly connected to one side, close to each other, of the valve cover (251) and inserted into the movable cavity (211), and the inserting sleeve (252) is in sealing abutting connection with the inner side of the movable cavity (211).

4. An air operated diaphragm pump according to claim 3 wherein: an annular groove (2523) is formed in the peripheral surface of the insert sleeve (252), and a sealing ring (2524) with the outer side capable of abutting against the inner side of the movable cavity (211) is arranged in the annular groove (2523).

5. An air operated diaphragm pump according to claim 1, wherein: keep away from slot (215) upside of bottom plate (3) one side and all seted up first guide way (2151).

6. An air operated diaphragm pump according to claim 1, wherein: and the side surfaces of two ends of the through groove (2512) are provided with second guide grooves (2513).

7. An air operated diaphragm pump according to claim 1, wherein: the outer side of the valve cover (251) is recessed 0.1-0.3mm from the end face of the reversing valve shell (21).

8. An air operated diaphragm pump according to claim 1, wherein: the outer peripheral surface of the valve cover (251) is screwed to the reversing valve housing (21).

9. An air operated diaphragm pump according to claim 1, wherein: a plurality of insertion holes (2511) are formed in the outer side of the valve cover (251).

10. An air operated diaphragm pump according to claim 1, wherein: conical guide rings (214) are arranged at the positions of the reversing valve shell (21) corresponding to the two ends of the movable cavity (211).