A hydrochloric acid corrosion resistant diaphragm pump hydraulic end delivery device

Abstract

A hydrochloric acid corrosion resistant diaphragm pump hydraulic end delivery device belongs to the technical field of diaphragm pumps, and specifically relates to a hydrochloric acid corrosion resistant diaphragm pump hydraulic end delivery device. The present invention provides a low-cost diaphragm pump hydraulic end delivery device that can work stably for a long time in a hydrochloric acid corrosion environment. The present invention includes a feed flow buffer device, a feed pipe, a one-way valve, a diaphragm chamber, a discharge pipe and a discharge buffer device connected in sequence, and the diaphragm chamber is connected to the piston cylinder, and is characterized in that: the inner surfaces of the feed flow buffer device, the feed pipe and the discharge pipe are all provided with soft rubber; the one-way valve includes a valve box lined with soft rubber, and the lower end of the valve box is provided with a flow seat connected to the feed pipe, and a buffer rubber is provided above the flow seat, and a guide frame is provided above the buffer rubber, and a valve ball corresponding to the buffer rubber and the flow seat is provided in the guide frame, and a limit cover of the valve ball is provided at the upper end of the valve box.

Description

Technical Field

[0001] The invention belongs to the technical field of diaphragm pumps, and in particular relates to a hydraulic end conveying device of a diaphragm pump resistant to hydrochloric acid corrosion. Background Art

[0002] As a functional device for slurry transportation, the diaphragm pump hydraulic end device is in contact with the solid-liquid two-phase medium. The conventional hydraulic end device mainly considers its pressure bearing and wear resistance. However, for diaphragm pumps that transport hydrochloric acid media, in addition to pressure bearing and wear resistance, its corrosion resistance also needs to be considered, especially for slurries containing hydrochloric acid. Conventional metal materials or stainless steel materials cannot meet the requirements of hydrochloric acid corrosion resistance. Metal materials that can meet the requirements of hydrochloric acid corrosion resistance can only be used in laboratories due to their high prices and are not suitable for use in large equipment. There are many non-metallic materials that can meet the requirements of hydrochloric acid corrosion resistance, but their strength performance is poor and cannot meet the mechanical performance requirements of diaphragm pumps. For example, rubber, polytetrafluoroethylene, etc. cannot meet the pressure requirements of the process system when used alone. Ceramic products cannot be used in diaphragm pump structures because of their difficulty in processing and lack of impact resistance. Therefore, there is no diaphragm pump hydraulic end conveying device on the market that can resist hydrochloric acid corrosion. Summary of the invention

[0003] The present invention aims at solving the above problems and provides a diaphragm pump hydraulic end conveying device which is low in cost and can work stably for a long time in a hydrochloric acid corrosive environment.

[0004] To achieve the above-mentioned purpose of the present invention, the present invention adopts the following technical scheme, which includes a feed flow buffer device, a feed pipe, a one-way valve, a diaphragm chamber, a discharge pipe and a discharge buffer device connected in sequence, the diaphragm chamber is connected to the piston cylinder, and is characterized in that: the inner surfaces of the feed flow buffer device, the feed pipe and the discharge pipe are all provided with soft rubber; the one-way valve includes a valve box lined with soft rubber, a flow seat connected to the feed pipe is provided at the lower end of the valve box, a buffer rubber is provided above the flow seat, a guide frame is provided above the buffer rubber, a valve ball corresponding to the buffer rubber and the flow seat is provided in the guide frame, and a valve box is provided at the upper end. The limit cover of the valve ball; the flow seat, guide frame and limit cover are made of polytetrafluoroethylene material, and the valve ball is a ceramic valve ball or a rubber-lined valve ball; the diaphragm chamber cooperates with the diaphragm cover, and a diaphragm body is arranged between the diaphragm chamber and the diaphragm cover, and the surface of the diaphragm chamber and the diaphragm cover is provided with hard rubber, and the flow area of ​​the diaphragm chamber and the diaphragm cover is provided with soft rubber; the diaphragm body is set as fluororubber; the discharging buffer device includes an upper shell, a lower shell and a bowl-shaped airbag, the surface of the upper shell and the lower shell cooperate with each other is provided with hard rubber, and the upper shell and the lower shell are provided with soft rubber at the contact with the slurry; the bowl-shaped airbag is set as fluororubber.

[0005] As a preferred solution of the present invention, the fitting part of the diaphragm cover and the diaphragm chamber is arranged as a stepped structure, and the hard rubber is coated on the outside of the stepped structure; the soft rubber in the flow area of ​​the diaphragm chamber and the diaphragm cover is bent at the corner and overlapped with the hard rubber.

[0006] As another preferred embodiment of the present invention, the assembly part of the upper shell and the lower shell of the discharging buffer device is arranged in a stepped shape, and the hard rubber is coated on the outside of the stepped structure of the lower shell; the inner surface of the upper shell is arranged in a soft rubber, and the soft rubber on the inner surface of the lower shell is bent at the corner and overlapped with the hard rubber.

[0007] Beneficial effects of the present invention:

[0008] The present invention provides soft rubber at the contact position with the slurry, and uses hard rubber at the assembly position, thereby avoiding the problem of difficult processing of soft rubber. The overlapping soft rubber and hard rubber form a good connection, ensuring that the metal shell is not corroded, and the connection can also ensure the service life and is easy to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the present invention.

[0010] Figure 2 It is a structural diagram of a one-way valve.

[0011] Figure 3 It is a structural schematic diagram of the diaphragm chamber.

[0012] Figure 4 yes Figure 3 Enlarged view of part A.

[0013] Figure 5 yes Figure 3 Enlarged view of part B.

[0014] Figure 6 It is a structural schematic diagram of the discharge buffer device.

[0015] Figure 7 yes Figure 6 Enlarged view of part C.

[0016] In the attached drawings, 1 is a feed flow buffer device, 2 is a feed pipe, 3 is a one-way valve, 4 is a diaphragm chamber, 5 is a discharge pipe, 6 is a discharge buffer device, 7 is a piston cylinder, 8 is soft rubber, 9 is hard rubber, 10 is a disassembly structure, 21 is a valve box, 22 is a clamping ring, 23 is a flow seat, 24 is a buffer rubber, 25 is a lower mounting groove, 26 is an upper mounting groove, 27 is a valve ball, 28 is a clamping body, 29 is a guide frame, 210 is a limit cover, 41 is a diaphragm cover, 42 is a diaphragm body, 61 is a bowl-shaped air bag, 62 is a lower shell, and 63 is an upper shell. DETAILED DESCRIPTION

[0017] The present invention comprises a feed flow buffer device 1, a feed pipe 2, a one-way valve 3, a diaphragm chamber 4, a discharge pipe 5 and a discharge buffer device 6 which are connected in sequence, the diaphragm chamber 4 is connected to a piston cylinder 7, and is characterized in that: the inner surfaces of the feed flow buffer device 1, the feed pipe 2 and the discharge pipe 5 are all provided with soft rubber 8; the one-way valve 3 comprises a valve box 21 lined with soft rubber 8, a flow seat 23 connected to the feed pipe 2 is provided at the lower end of the valve box 21, a buffer rubber 24 is provided above the flow seat 23, a guide frame 29 is provided above the buffer rubber 24, a valve ball 27 corresponding to the buffer rubber 24 and the flow seat 23 is provided in the guide frame 29, and a limit cover 210 of the valve ball 27 is provided at the upper end of the valve box 21; the flow seat 23 , the guide frame 29 and the limit cover 210 are made of polytetrafluoroethylene material, and the valve ball 27 is a ceramic valve ball 27 or a rubber-lined valve ball 27; the diaphragm chamber 4 is matched with the diaphragm cover 41, and a diaphragm body 42 is arranged between the diaphragm chamber 4 and the diaphragm cover 41, and the surface of the diaphragm chamber 4 and the diaphragm cover 41 is provided with hard rubber 9, and the flow area of ​​the diaphragm chamber 4 and the diaphragm cover 41 is provided with soft rubber 8; the diaphragm body is set as fluororubber; the discharging buffer device 6 includes an upper shell 63, a lower shell 62 and a bowl-shaped airbag 61, and the surface of the upper shell 63 and the lower shell 62 are provided with hard rubber 9 at the place where the upper shell 63 and the lower shell 62 cooperate with each other, and the upper shell 63 and the lower shell 62 are provided with soft rubber 8 at the contact with the slurry; the bowl-shaped airbag 61 is set as fluororubber.

[0018] A lower mounting groove 25 with an inner height and an outer bottom is provided above the flow seat 23, and the shape of the buffer rubber 24 corresponds to that of the lower mounting groove 25. An upper mounting groove 26 with an inner height and an outer bottom is provided above the buffer rubber 24. The mounting seat at the lower end of the guide frame 29 is provided in the upper mounting groove 26, and a gap is provided between the guide part at the upper end of the guide frame 29 and the inner surface of the valve box 21, and the inner diameter of the guide part is larger than the outer diameter of the valve ball 27; a clamping body 28 is provided in the valve box 21 corresponding to the mounting seat of the guide frame 29; the guide frame 29, the buffer rubber 24 and the flow seat 23 are fixed in the valve box 21 by a clamping ring 22 and a clamping body 28.

[0019] As a preferred solution of the present invention, the fitting part of the diaphragm cover 41 and the diaphragm chamber 4 is arranged as a stepped structure, and the hard rubber 9 is covered outside the stepped structure; the soft rubber 8 in the flow area of ​​the diaphragm chamber 4 and the diaphragm cover 41 is bent at the corner and overlapped with the hard rubber 9.

[0020] As another preferred embodiment of the present invention, the assembly part of the upper shell 63 and the lower shell 62 of the discharging buffer device 6 is arranged in a stepped shape, and the hard rubber 9 is covered on the outside of the stepped structure of the lower shell 62; the inner surface of the upper shell 63 is arranged in a soft rubber 8, and the soft rubber 8 on the inner surface of the lower shell 62 is bent at the corner and overlapped with the hard rubber 9.

[0021] Embodiment: The feed flow buffer device 1 is used as a slurry supply compensation and diversion device and needs to be in contact with the slurry. Carbon steel is selected as the pressure-bearing shell material, and the wear-resistant soft rubber 8 is lined inside. The device can be designed into a structure with upper and lower parts and a gland, and rubber lining can be implemented separately to solve the problem of difficult lining construction.

[0022] The feed pipe 2 and the discharge pipe 5 serve as the feeding and discharging channels. Carbon steel is selected as the pipe body material and the inner lining is soft rubber 8 to ensure that the feed pipe 2 acts as a slurry flow channel. The shell has high pressure bearing characteristics and the inner lining has wear and corrosion resistance.

[0023] The valve box 21 of the one-way valve 3 is made of alloy steel, and the internal rubber lining is a combination of soft and hard rubber 9. The part in contact with the slurry is made of soft rubber 8, and the part with assembly and processing requirements is made of hard rubber 9. The flow seat 23, the guide frame 29, and the limit cover 210 are in contact with the slurry, but they are non-pressure-bearing parts. Due to their complex structural shapes and compact space, they are not suitable for rubber lining corrosion protection. Therefore, polytetrafluoroethylene products are selected for processing and molding. The ceramic valve ball 27 is in contact with the valve rubber and needs to be sealed, so a rubber-lined valve ball 27 or a ceramic valve ball 27 is selected.

[0024] The shell of the diaphragm cover of the diaphragm chamber 4 is made of alloy steel, and the internal lining rubber is a combination of soft and hard rubber 9. The flow area and the processing and assembly area are designed in a stepped form to solve the problem of the difficulty of processing the soft rubber 8. The part in contact with the slurry is made of soft rubber 8, and the assembly and processing parts are made of hard rubber 9. The diaphragm is made of fluororubber material with excellent hydrochloric acid resistance. The diaphragm pump isolates the slurry from the hydraulic oil through the diaphragm, and does not contact the slurry when the diaphragm is not damaged. Therefore, the inner cavity surface behind the diaphragm can be anti-corrosion coated or not.

[0025] The discharge buffer device 6 will be designed as a split structure, which can solve the problem of difficult corrosion protection inside the buffer device; the airbag adopts fluororubber material with excellent hydrochloric acid resistance, and the inner cavity of the upper and lower shells 62 and the contact part with the slurry are lined with soft hydrochloric acid corrosion-resistant and wear-resistant rubber, and the processing and matching areas are lined with hard machinable rubber, and the processing and non-processing areas are designed to be stepped to improve the machinability, thereby achieving the dual effects of assembly and corrosion protection.

[0026] The piston cylinder 7 is not in direct contact with the slurry, so only the inner surface of the piston cylinder 7 is subjected to anti-corrosion coating.

[0027] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. A hydrochloric acid corrosion resistant diaphragm pump hydraulic end delivery device, comprising a feed flow buffer device (1), a feed pipe (2), a one-way valve (3), a diaphragm chamber (4), a discharge pipe (5) and a discharge buffer device (6) connected in sequence, the diaphragm chamber (4) being connected to a piston cylinder (7), characterized in that: The inner surfaces of the feed flow buffer device (1), the feed pipe (2) and the discharge pipe (5) are all provided with soft rubber (8); the one-way valve (3) comprises a valve box (21) lined with soft rubber (8); a flow seat (23) communicating with the feed pipe (2) is provided at the lower end of the valve box (21); a buffer rubber (24) is provided above the flow seat (23); a guide frame (29) is provided above the buffer rubber (24); a valve ball (27) corresponding to the buffer rubber (24) and the flow seat (23) is provided in the guide frame (29); a limit cover (210) for the valve ball (27) is provided at the upper end of the valve box (21); the flow seat (23), the guide frame (29) and the limit cover (210) are made of polytetrafluoroethylene material; the valve ball (27) is a ceramic valve. The diaphragm chamber (4) is matched with the diaphragm cover (41), a diaphragm body (42) is arranged between the diaphragm chamber (4) and the diaphragm cover (41), a hard rubber (9) is arranged on the surface of the matching part of the diaphragm chamber (4) and the diaphragm cover (41), and a soft rubber (8) is arranged in the flow area of ​​the diaphragm chamber (4) and the diaphragm cover (41); the diaphragm body is set as fluororubber; the discharge buffer device (6) comprises an upper shell (63), a lower shell (62) and a bowl-shaped airbag (61), a hard rubber (9) is arranged on the surface of the matching part of the upper shell (63) and the lower shell (62), and a soft rubber (8) is arranged at the contact part of the upper shell (63) and the lower shell (62) with the slurry; the bowl-shaped airbag (61) is set as fluororubber; A lower mounting groove (25) with an inner height and an outer bottom is provided above the flow seat (23); the shape of the buffer rubber (24) corresponds to that of the lower mounting groove (25); an upper mounting groove (26) with an inner height and an outer bottom is provided above the buffer rubber (24); a mounting seat at the lower end of the guide frame (29) is provided in the upper mounting groove (26); a gap is provided between a guide portion at the upper end of the guide frame (29) and an inner surface of the valve box (21); an inner diameter of the guide portion is larger than an outer diameter of the valve ball (27); a pressing body (28) is provided in the valve box (21) corresponding to the mounting seat of the guide frame (29); the guide frame (29), the buffer rubber (24) and the flow seat (23) are fixed in the valve box (21) via a pressing ring (22) and the pressing body (28); The mating portion of the diaphragm cover (41) and the diaphragm chamber (4) is arranged as a stepped structure, and the hard rubber (9) is coated outside the stepped structure; the soft rubber (8) in the flow-through area of ​​the diaphragm chamber (4) and the diaphragm cover (41) is bent at the corner and overlapped with the hard rubber (9); The assembly point of the upper shell (63) and the lower shell (62) of the discharge buffer device (6) is arranged in a stepped shape, and the hard rubber (9) is coated on the outside of the stepped structure of the lower shell (62); the inner surface of the upper shell (63) is arranged in a soft rubber (8), and the soft rubber (8) on the inner surface of the lower shell (62) is bent at a corner and overlapped with the hard rubber (9).

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