A metering pump with a high-temperature resistant metal diaphragm structure

Abstract

This invention discloses a metering pump with a high-temperature resistant metal diaphragm structure, comprising a diaphragm pump head, a cylinder mounted on the diaphragm pump head, a pump head connector mounted on the cylinder, and a diaphragm plate mounted between the diaphragm pump head and the cylinder; a plunger is movably mounted within the cylinder and the pump head connector; characterized in that a double-layered metal diaphragm is installed between the diaphragm pump head and the diaphragm plate; a diaphragm supporting the metal diaphragm and a metal sealing structure sealing the metal diaphragm are installed between the metal diaphragms; the metal sealing assembly includes a metal sealing block, and multiple sealing structures between the metal sealing block and the metal diaphragm, and between the metal diaphragm and the diaphragm pump head and the diaphragm plate; a vacuuming assembly for evacuating the space between the double-layered metal diaphragms is also installed on the metal sealing block. This invention utilizes a diaphragm installed between the double-layered metal diaphragms to support the entire metal diaphragm, reducing the probability of metal diaphragm damage and extending the service life of the metal diaphragm.

Description

Technical Field

[0001] This invention relates to the field of metering pump technology, specifically to a metering pump with a high-temperature resistant metal diaphragm structure. Background Technology

[0002] Metering pumps offer advantages such as precise and adjustable delivery rates, making them ideal for accurate fluid metering and dosing. Classified by pump body type, they fall into two main categories: plunger metering pumps and diaphragm metering pumps. In existing technologies, diaphragm metering pumps used in high-temperature applications require metal diaphragms. A ring-shaped support plate is installed between the metal diaphragm and the pump head, providing support only to the outer ring of the diaphragm. This fails to support the central portion of the diaphragm, making it prone to breakage due to bending deformation during pump operation, thus reducing its lifespan. Furthermore, existing metal diaphragms rely solely on surface-to-surface contact for sealing, making leakage a common problem during operation. Additionally, when pumping special media, diaphragm maintenance requires flushing the sealed diaphragm cavity without disassembling the pump body, posing a safety hazard, which current products lack. Therefore, this paper proposes a metering pump with a high-temperature resistant metal diaphragm structure. Summary of the Invention

[0003] The purpose of this invention is to solve the above problems by proposing a metering pump with a high-temperature resistant metal diaphragm structure.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a metering pump with a high-temperature resistant metal diaphragm structure, comprising a diaphragm pump head, a cylinder mounted on the diaphragm pump head, a pump head connector mounted on the cylinder, and a diaphragm plate mounted between the diaphragm pump head and the cylinder; a plunger is movably mounted within the cylinder and the pump head connector; characterized in that a double-layered metal diaphragm is installed between the diaphragm pump head and the diaphragm plate; a diaphragm supporting the metal diaphragm and a metal sealing structure sealing the metal diaphragm are installed between the metal diaphragms; the metal sealing assembly includes a guide ring, and multiple sealing structures between the guide ring and the metal diaphragm, and between the metal diaphragm and the diaphragm pump head and the diaphragm plate; the guide ring is also equipped with a vacuuming assembly and a diaphragm cavity flushing assembly for evacuating and flushing the double-layered metal diaphragms, respectively.

[0005] Preferably, the flow guide ring is connected to the diaphragm; the multiple sealing structure includes a plurality of sealing bosses disposed on the flow guide ring, the diaphragm pump head and the diaphragm plate, and a sealing groove disposed on the metal diaphragm that is adapted to the sealing bosses.

[0006] Preferably, the flow guide ring, the diaphragm pump head, and the sealing boss on the diaphragm plate are arranged in an alternating manner.

[0007] Preferably, the vacuum assembly includes a vacuum channel disposed on the guide ring and the diaphragm, and a vacuum valve installed on the guide ring and communicating with the vacuum channel.

[0008] Preferably, the diaphragm cavity flushing assembly includes a flushing channel disposed on a guide ring, a flushing valve connected to the flushing channel, and a flushing shut-off valve connected to the flushing valve; the flushing shut-off valve is connected to valve 1 and valve 2; valve 1 and valve 2 are connected to an oil tank; valve 2 is also connected to a filter pressure reducing valve and an air source.

[0009] Preferably, the diaphragm pump head is provided with a liquid channel and an inlet valve and an outlet valve that are respectively connected to the liquid channel.

[0010] Preferably, the diaphragm pump head is also equipped with a heating chamber cover plate, which forms a pump head heating chamber with the front end of the diaphragm pump head; steam pipes are connected between the heating chamber of the inlet valve and the heating chamber of the outlet valve and the heating chamber cover plate of the pump head; steam outlet pipe and steam inlet pipe are also connected to the inlet valve and the outlet valve respectively.

[0011] Preferably, the pump head connector is provided with an oil chamber; the oil chamber is provided with a cooling water pipe; and the cylinder is also equipped with a replenishing valve and a safety valve that communicate with the oil chamber and the diaphragm plate.

[0012] Preferably, a cylinder block protective diaphragm plate is also installed on the diaphragm plate; a diaphragm plate copper sleeve is installed between the diaphragm plate and the cylinder block protective diaphragm plate.

[0013] Preferably, a plunger retaining ring, a plunger support ring, and a packing bushing are installed between the plunger and the cylinder; a crosshead piston is also installed on the plunger; and a plunger clamping nut connected to the crosshead piston is fitted onto the plunger.

[0014] The beneficial effects of this invention are: by using a diaphragm installed between two layers of metal diaphragms to support the entire metal diaphragm, the probability of metal diaphragm breakage is reduced and the service life of the metal diaphragm is extended.

[0015] By using metal sealing components to perform multiple seals between the diaphragm pump head and cylinder and the metal diaphragm, the sealing performance between the diaphragm pump head and cylinder and the metal diaphragm at high temperatures is improved.

[0016] By using a vacuum pumping assembly to create a vacuum between the two layers of metal diaphragms, and connecting a pressure gauge to the vacuum pumping assembly, the pressure between the two layers of metal diaphragms can be detected, and the pressure changes when the metal diaphragms rupture or leak can be measured.

[0017] By using a diaphragm cavity flushing assembly to flush the diaphragm sealing cavity of the pump head, safety hazards during pump maintenance when using special media are eliminated. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 This is a partial structural schematic diagram of the present invention.

[0020] Figure 3 This is the present invention. Figure 1 A magnified view of a portion of point A in the middle.

[0021] Figure 4 This is the present invention. Figure 2 A magnified view of a section at point B.

[0022] Legend: 1. Diaphragm pump head; 101. Liquid passage; 102. Inlet valve; 103. Outlet valve; 104. Heating cover plate; 105. Steam pipe; 106. Steam outlet pipe; 107. Steam inlet pipe; 2. Cylinder body; 201. Oil replenishing valve; 202. Safety valve; 203. Plunger retaining ring; 204. Plunger support ring; 205. Packing bushing; 206. Crosshead piston; 207. Plunger clamping nut; 3. Pump head connector; 301. Oil chamber; 302. Cooling water pipe; 4. Diaphragm plate; 401. Cylinder body 402. Membrane plate; 5. Copper sleeve for membrane plate; 6. Plunger; 7. Metal diaphragm; 801. Diaphragm; 9. Metal sealing assembly; 101. Guide ring; 11. Multiple sealing structure; 12. Sealing boss; 13. Sealing groove; 14. Vacuum assembly; 15. Vacuum channel; 16. Vacuum valve; 17. Diaphragm cavity flushing assembly; 18. Flushing channel; 19. Flushing valve; 10. Flushing shut-off valve; 10. Valve 1; 11. Valve 2; 12. Oil tank; 13. Filter pressure reducing valve; 14. Air source. Detailed Implementation

[0023] The metering pump with a high-temperature resistant metal diaphragm structure described in this invention will now be further described with reference to the accompanying drawings.

[0024] See appendix Figure 1-4As shown, this embodiment of a metering pump with a high-temperature resistant metal diaphragm structure includes a diaphragm pump head 1, a cylinder 2 mounted on the diaphragm pump head 1, a pump head connector 3 mounted on the cylinder 2, and a diaphragm plate 4 installed between the diaphragm pump head 1 and the cylinder 2; a plunger 5 is movably installed within the cylinder 2 and the pump head connector 3; characterized in that a double-layered metal diaphragm 6 is installed between the diaphragm pump head 1 and the diaphragm plate 4; a diaphragm 601 supporting the metal diaphragm 6 and a metal sealing assembly 7 sealing the metal diaphragm 6 are installed between the metal diaphragm 6; the metal sealing assembly 7 includes a flow guide ring 701, and multiple sealing structures 702 disposed between the flow guide ring 701 and the metal diaphragm 6 and between the metal diaphragm 6 and the diaphragm pump head 1 and the diaphragm plate 4; the flow guide ring 701 is also equipped with a vacuum pump and a flushing mechanism for evacuating the double-layered metal diaphragm 6 respectively. The system includes a vacuum pump assembly 8 and a diaphragm chamber flushing assembly 9. A diaphragm 601 is installed between the two layers of metal diaphragms 6 to support the entire metal diaphragm 6, reducing the probability of diaphragm 6 breakage and extending its service life. A metal sealing assembly 7 provides multiple seals between the diaphragm pump head 1, cylinder 2, and metal diaphragm 6, improving the sealing performance at high temperatures. The vacuum pump assembly 8 creates a vacuum between the two layers of metal diaphragms 6; a pressure gauge connected to the vacuum pump assembly 8 can detect the pressure between the two layers of metal diaphragms 6, measuring pressure changes when the metal diaphragm 6 ruptures or leaks. The diaphragm chamber flushing assembly 9 flushes the diaphragm sealing chamber of the pump head, eliminating safety hazards during pump maintenance when using special media.

[0025] See appendix Figure 1-4 As shown, the guide ring 701 is connected to the diaphragm 601; the multi-seal structure 702 includes a plurality of sealing bosses 703 disposed on the guide ring 701, the diaphragm pump head 1, and the diaphragm plate 4, and a sealing groove 704 disposed on the metal diaphragm 6 that is adapted to the sealing bosses 703; the sealing bosses 703 on the guide ring 701, the diaphragm pump head 1, and the diaphragm plate 4 are staggered; the vacuum assembly 8 includes a vacuum channel 801 disposed on the guide ring 701 and the diaphragm 601, and a vacuum valve 802 installed on the guide ring 701 and communicating with the vacuum channel 801; through The sealing groove 704 on the double-layered metal diaphragm 6 is adapted to the guide ring 701, the sealing boss 703 on the diaphragm pump head 1 and the diaphragm plate 4 to perform multiple seals between the diaphragm pump head 1 and the cylinder 2 and the metal diaphragm 6, thereby improving the sealing performance between the diaphragm pump head 1 and the cylinder 2 and the metal diaphragm 6 at high temperatures. By using a vacuum pumping device to evacuate the space between the double-layered metal diaphragm 6 through the vacuum valve 802 and the vacuum channel 801, the pressure gauge connected to the vacuum valve 802 can detect the pressure between the metal diaphragm 6 in real time, so that the pressure change can be directly observed when the metal diaphragm 6 ruptures or leaks.

[0026] See appendix Figure 1 As shown, the diaphragm cavity flushing assembly 9 includes a flushing channel 901 disposed on a guide ring 701, a flushing valve 902 connected to the flushing channel 901, and a flushing shut-off valve 903 connected to the flushing valve 902; the flushing shut-off valve 903 is connected to valve 1 904 and valve 2 905; valve 1 904 and valve 2 905 are connected to an oil tank 906; valve 2 905 is also connected to a filter pressure reducing valve 907 and an air source 908; nitrogen is introduced through the air source 908, and the nitrogen passes through the flushing shut-off valve 903 and the flushing valve 902 into the flushing channel 901 to flush the diaphragm sealing cavity, eliminating safety hazards during pump maintenance when using special media.

[0027] See appendix Figure 1-4 As shown, the diaphragm pump head 1 is provided with a liquid channel 101 and an inlet valve 102 and an outlet valve 103 respectively communicating with the liquid channel 101; a heating cover plate 104 is also installed on the diaphragm pump head 1; a steam pipe 105 is connected between the inlet valve 102 and the outlet valve 103 and the heating cover plate 104; a steam outlet pipe 106 and a steam inlet pipe 107 are also connected to the inlet valve 102 and the outlet valve 103 respectively; an oil chamber 301 is provided on the pump head connecting body 3; a cooling water pipe 302 is provided in the oil chamber 301; a replenishing oil valve 201 and a safety valve 202 communicating with the oil chamber 301 and the diaphragm plate 4 are also installed on the cylinder body 2; a cylinder body protective diaphragm plate 401 is also installed on the diaphragm plate 4; a diaphragm plate copper sleeve 402 is installed between the diaphragm plate 4 and the cylinder body protective diaphragm plate 401; and a piston 5 is connected to the cylinder body 2. The plunger 5 is equipped with a plunger retaining ring 203, a plunger support ring 204, and a packing bushing 205; a crosshead piston 206 is also installed on the plunger 5; a plunger clamping nut 207 connected to the crosshead piston 206 is fitted on the plunger 5; steam is introduced into the outlet valve 103 through the steam inlet pipe 107 to heat the inside of the inlet and outlet valve 103; the steam passing through the inlet and outlet valve 103 enters the space between the heating cover plate 104 and the diaphragm pump head 1 through the steam pipe to heat the inner wall of the liquid passage 101 of the diaphragm pump head 1; then it is transported to the outlet valve 103 through the steam pipe to heat the inside of the outlet valve 103 and then discharged through the steam outlet pipe 106; the inlet valve 102, outlet valve 103, and liquid passage 101 through which the medium passes are heated and kept warm, thereby preventing the high-temperature medium from solidifying when it encounters cold, which would affect normal use.

[0028] In this invention, during installation, a supporting diaphragm 6 is first installed between the two metal diaphragms 6 to reduce the gap between them during operation and decrease the range of motion. Then, the vacuum channel 801 on the guide ring 701 is aligned and connected with the vacuum channel 801 on the diaphragm 4. The sealing boss 703 on the guide ring 701 is installed within the sealing groove 704 of the two metal diaphragms 6, thus installing the guide ring 701 between the two metal diaphragms 6. Simultaneously, the diaphragm pump... The sealing bosses 703 on the head 1 and diaphragm plate 4 are also installed in the sealing grooves 704 on the two metal diaphragms 6, providing multiple seals between the diaphragm pump head 1 and diaphragm plate 4 and the two metal diaphragms 6. During operation, a vacuum pump is used to evacuate the space between the two metal diaphragms 6 through the vacuum valve 802 and the vacuum channel 801, and a voltmeter is connected to monitor the pressure between the two metal diaphragms 6. When the metal diaphragm 6 ruptures or hydraulic oil and medium leak, the pointer on the voltmeter will change, which serves as a reminder to the operator.

[0029] When it is necessary to flush the diaphragm sealing cavity to eliminate safety hazards during pump maintenance when using special media, first pour mineral oil into the oil tank 906 up to the highest position A and tighten the oil filling cap. Then, introduce nitrogen gas into the air source 908. The nitrogen gas passes through the filter pressure reducing valve 907, valve 1 904, flushing shut-off valve 903, and flushing valve 902 in sequence into the flushing channel 901 to flush the diaphragm sealing cavity. After flushing for 1 minute, adjust the direction of valve 1 904 to introduce nitrogen gas into the oil tank 906, and open valve 2 905 to allow the mineral oil level in the oil tank 906 to drop to position B. Then, close valve 1 904 and valve 2 905 and allow the pump to run under working pressure until mineral oil appears at the flushing shut-off valve 903. Finally, close the flushing shut-off valve 903. The flushing is complete, and the pump can operate normally.

[0030] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.

Claims

1. A metering pump with a high-temperature resistant metal diaphragm structure, comprising a diaphragm pump head (1), a cylinder (2) mounted on the diaphragm pump head (1), a pump head connector (3) mounted on the cylinder (2), and a diaphragm plate (4) mounted between the diaphragm pump head (1) and the cylinder (2); a plunger (5) is movably installed within the cylinder (2) and the pump head connector (3); characterized in that... A double-layered metal diaphragm (6) is installed between the diaphragm pump head (1) and the diaphragm plate (4); a diaphragm (601) supporting the metal diaphragm (6) and a metal sealing assembly (7) sealing the metal diaphragm (6) are installed between the metal diaphragms (6); the metal sealing assembly (7) includes a guide ring (701), a multi-layered sealing structure (702) between the guide ring (701) and the metal diaphragm (6) and between the metal diaphragm (6) and the diaphragm pump head (1) and the diaphragm plate (4); the guide ring (701) is also equipped with a vacuum pump and a vacuum pump for evacuating the double-layered metal diaphragms (6) respectively. The rinsing vacuum assembly (8) and the diaphragm cavity rinsing assembly (9) include a rinsing channel (901) provided on the guide ring (701), a rinsing valve (902) connected to the rinsing channel (901), and a rinsing shut-off valve (903) connected to the rinsing valve (902); the rinsing shut-off valve (903) is connected to valve 1 (904) and valve 2 (905); the valve 1 (904) and valve 2 (905) are connected to an oil tank (906); the valve 2 (905) is also connected to a filter pressure reducing valve (907) and an air source (908).

2. The metering pump with a high-temperature resistant metal diaphragm structure according to claim 1, characterized in that: The flow guide ring (701) is connected to the diaphragm (601); the multiple sealing structure (702) includes a plurality of sealing bosses (703) provided on the flow guide ring (701), the diaphragm pump head (1) and the diaphragm plate (4) and a sealing groove (704) provided on the metal diaphragm (6) that is adapted to the sealing bosses (703).

3. A metering pump with a high-temperature resistant metal diaphragm structure according to claim 2, characterized in that: The flow guide ring (701), the diaphragm pump head (1), and the sealing boss (703) on the diaphragm plate (4) are arranged in an alternating manner.

4. A metering pump with a high-temperature resistant metal diaphragm structure according to claim 1, characterized in that: The vacuum assembly (8) includes a vacuum channel (801) disposed on the guide ring (701) and the diaphragm (601) and a vacuum valve (802) installed on the guide ring (701) and communicating with the vacuum channel (801).

5. A metering pump with a high-temperature resistant metal diaphragm structure according to claim 1, characterized in that: The diaphragm pump head (1) is provided with a liquid channel (101) and an inlet valve (102) and an outlet valve (103) respectively connected to the liquid channel (101).

6. A metering pump with a high-temperature resistant metal diaphragm structure according to claim 5, characterized in that: A heating cover plate (104) is also installed on the diaphragm pump head (1); a steam pipe (105) is connected between the inlet valve (102) and the outlet valve (103) and the heating cover plate (104); a steam outlet pipe (106) and a steam inlet pipe (107) are also connected to the inlet valve (102) and the outlet valve (103) respectively.

7. A metering pump with a high-temperature resistant metal diaphragm structure according to claim 1, characterized in that: The pump head connector (3) is provided with an oil chamber (301); the oil chamber (301) is provided with a cooling water pipe (302); the cylinder body (2) is also equipped with an oil replenishment valve (201) and a safety valve (202) that are connected to the oil chamber (301) and the diaphragm plate (4).

8. A metering pump with a high-temperature resistant metal diaphragm structure according to claim 7, characterized in that: A cylinder body protective diaphragm plate (401) is also installed on the diaphragm plate (4); a diaphragm plate copper sleeve (402) is installed between the diaphragm plate (4) and the cylinder body protective diaphragm plate (401).

9. A metering pump with a high-temperature resistant metal diaphragm structure according to claim 1, characterized in that: A plunger retaining ring (203), a plunger support ring (204), and a packing bushing (205) are installed between the plunger (5) and the cylinder (2); a crosshead piston (206) is also installed on the plunger (5); a plunger clamping nut (207) connected to the crosshead piston (206) is fitted on the plunger (5).

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