High negative pressure diaphragm pump adjusting mechanism

Abstract

The invention relates to a high negative pressure diaphragm pump adjusting mechanism, which relates to the technical field of high negative pressure diaphragm pumps, and comprises a shell, a motor, a connecting rod assembly, a diaphragm, a first cover body, a second cover body, an inlet pipe, an outlet pipe and an adjusting mechanism. The adjusting mechanism is installed on the connecting rod assembly of the diaphragm pump, the threads are arranged at the two ends of the adjusting mechanism, accurate adjustment of the internal space of the diaphragm pump is achieved by manually rotating the adjusting mechanism and utilizing the screw pitch difference of the two ends, the clearance volume between the diaphragm and the valve plate is reduced under the condition that the diaphragm pump is not disassembled, and therefore the negative pressure is improved. According to the design of the screw pitch difference, the adjusting amount is equal to the difference value of the screw pitches at the two ends every time the diaphragm pump rotates by one circle, and therefore high-precision fine adjustment of the internal space of the diaphragm pump is achieved, and the effects that traditional negative pressure adjustment is achieved, the convenience of negative pressure adjustment is improved through a gasket mode, and performance reduction caused by gasket abrasion is avoided are achieved.

Description

Technical Field

[0001] The present application relates to a high negative pressure diaphragm pump, and in particular to a high negative pressure diaphragm pump regulating mechanism. Background Art

[0002] At present, high negative pressure diaphragm pumps are widely used in chemical, pharmaceutical, food and other industries to transport corrosive, flammable, explosive or high-purity media. With the development of industrial technology, the negative pressure performance and adjustment accuracy requirements of diaphragm pumps are getting higher and higher. Under normal circumstances, the assembly gap between the diaphragm and the intermediate plate is often guaranteed by the dimensional tolerance of each part, which generally makes it difficult to achieve a sufficiently small clearance volume; or very high-precision part dimensions are required to achieve a smaller clearance volume, which is costly. The mainstream high negative pressure diaphragm pumps on the current market mainly achieve negative pressure regulation through mechanical structure, but generally have problems such as insufficient adjustment accuracy and poor stability.

[0003] Specific solutions of the existing technology: In the existing technology, the adjustment of the high negative pressure diaphragm pump is mainly achieved through manual adjustment of the gasket. The specific operation is to change the internal space of the diaphragm pump by increasing or decreasing the number of gaskets, thereby adjusting the negative pressure value. The advantages of this method are simple structure and effectiveness; the disadvantages are low adjustment accuracy, cumbersome operation, frequent disassembly and assembly, high labor costs, and inability to achieve fine-tuning. In addition, gasket adjustment is prone to cause a decrease in sealing performance due to gasket wear, affecting the long-term stability of the pump.

[0004] The existing application number is CN202220082137.6, which is a height position adjustment device for a diaphragm of a diaphragm pump. The device uses the probe of the altimeter to directly contact the diaphragm surface to measure the actual height position of the diaphragm in real time. During assembly, the shims are added or removed according to the measurement data to accurately adjust the diaphragm height and control the clearance volume of the diaphragm pump. However, only the tolerances of the diaphragm and the connecting rod are considered, and the tolerance influence of other parts is not considered.

[0005] The main defects of the existing technology are insufficient adjustment accuracy and inconvenient operation. It is difficult to achieve precise negative pressure control by gasket adjustment, and each adjustment requires shutdown, disassembly and assembly, which seriously affects production efficiency. In addition, wear and aging of the gasket will lead to a decrease in sealing performance, which in turn affects the negative pressure stability and service life of the pump. Summary of the Invention

[0006] The purpose of this application is to provide a high negative pressure diaphragm pump regulating mechanism to solve the problems raised by the above background technology.

[0007] The high-negative-pressure diaphragm pump regulating mechanism provided in the present application adopts the following technical solution: it includes a shell, a motor is installed on the outside of the shell, the output end of the motor is connected to the connecting rod assembly, and the connecting rod assembly is installed inside the shell, diaphragms are provided on the upper and lower sides of the connecting rod assembly, and a first cover body and a second cover body are respectively provided on the outside of the diaphragms on both sides, the first cover body and the second cover body are connected to the bottom and the top of the shell, and the first cover body and the second cover body are respectively connected to the inlet pipe and the outlet pipe on one side, characterized in that it also includes an regulating mechanism connected between the connecting rod assembly and the diaphragm, the regulating mechanism includes a first regulating member, a first threaded hole is opened in the middle of the first regulating member, a first threaded shaft is fixed to the bottom of the first regulating member, the inside of the first threaded hole is connected to the second threaded shaft, and the second threaded shaft is connected to the middle of the diaphragm, the first threaded shaft is connected to the inside of the second threaded hole, and the second threaded hole is opened on the outside of the connecting rod assembly.

[0008] By adopting the above-mentioned technical solution, that is, by respectively providing the first threaded hole and the first threaded shaft on both sides of the first adjusting member, high-precision adjustment is achieved. By utilizing the pitch difference of the threads at both ends, micron-level adjustment accuracy is achieved. Compared with the traditional method of adjusting the internal space of the diaphragm pump by adding or removing gaskets, the adjustment mechanism of the present invention does not require repeated disassembly and installation of gaskets, which greatly simplifies the operating steps. At the same time, since frequent disassembly and installation of gaskets is avoided, the problem of reduced sealing performance due to gasket wear is reduced, thereby improving the long-term stability of the diaphragm pump.

[0009] Preferably, the adjustment mechanism includes a second adjustment member, a third threaded hole is opened inside the second adjustment member, the two sides of the third threaded hole are respectively connected to the third threaded shaft and the fourth threaded shaft, the third threaded shaft is arranged in the middle of the diaphragm, and the fourth threaded shaft is arranged on the outside of the connecting rod assembly.

[0010] By adopting the above technical solution, that is, through the threaded docking effect of the third threaded hole provided inside the second adjusting member and the third threaded shaft and the fourth threaded shaft, the second adjustment transmission structure is realized to improve the adjustment diversity.

[0011] Preferably, the adjustment mechanism includes a third adjusting member, a fourth threaded hole is provided on one side of the third adjusting member, and a fifth threaded shaft is provided on the other side of the third adjusting member, the interior of the fourth threaded hole is connected to the sixth threaded shaft, and the sixth threaded shaft is arranged in the middle of the diaphragm, the fifth threaded shaft is connected to the fifth threaded hole, and the fifth threaded hole is opened on the outside of the connecting rod assembly.

[0012] By adopting the above technical solution, that is, by respectively setting a fourth threaded hole and a fifth threaded shaft at the upper and lower ends of the third adjusting member, the composition of the third adjusting transmission structure can be realized to meet the precise fine-tuning of the internal space of the diaphragm pump.

[0013] Preferably, the first adjusting member is arranged in a hexagonal shape close to the first threaded shaft.

[0014] Preferably, the middle portion of the second adjusting member is hexagonal.

[0015] Preferably, the third adjusting member is arranged in a hexagonal shape as a whole.

[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. This application installs an adjustment mechanism on the connecting rod assembly of a diaphragm pump. The adjustment mechanism has threads at both ends. By manually rotating the adjustment mechanism, the pitch difference between the two ends is used to precisely adjust the internal space of the diaphragm pump. Without disassembling the diaphragm pump, the clearance volume between the diaphragm and the valve plate is reduced, thereby increasing the negative pressure. The pitch difference is designed so that the adjustment amount for each rotation is equal to the difference in the pitch at the two ends, thereby achieving high-precision fine-tuning of the internal space of the diaphragm pump, solving the problem of traditional negative pressure adjustment. By using a gasket, the convenience of negative pressure adjustment is improved and the problem of performance degradation caused by gasket wear is avoided. 2. The adjustment mechanism in this application is made of high-strength materials such as stainless steel or other alloy steels to ensure corrosion resistance and strength. This solution has high adjustment accuracy and is far superior to the adjustment method of adding gaskets. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the diaphragm pump of this application; Figure 2 This is a schematic diagram of the internal structure of Example 1 of the present application; Figure 3 This is a schematic diagram of the disassembled structure of the adjustment mechanism in Example 1 of the present application; Figure 4 This is a schematic diagram of the internal structure of Example 2 of the present application; Figure 5 This is a schematic diagram of the disassembled structure of the adjustment mechanism in Example 2 of the present application; Figure 6 This is a schematic diagram of the internal structure of Example 3 of the present application; Figure 7 This is a schematic diagram of the split structure of the adjustment mechanism in Example 3 of the present application; Figure 8 It is a schematic diagram of the overall structure of an existing diaphragm pump.

[0018] Explanation of the accompanying drawings: 1. Housing; 2. Motor; 3. Connecting rod assembly; 4. Diaphragm; 5. First cover body; 6. Second cover body; 7. Inlet pipe; 8. Outlet pipe; 9. Adjustment mechanism; 91. First adjusting member; 92. First threaded hole; 93. First threaded shaft; 94. Second threaded shaft; 95. Second threaded hole; 96. Second adjusting member; 97. Third threaded hole; 98. Third threaded shaft; 99. Fourth threaded shaft; 910. Third adjusting member; 911. Fourth threaded hole; 912. Fifth threaded shaft; 913. Sixth threaded shaft; 914. Fifth threaded hole. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1 -Attached Figure 8 , further details of this application are given.

[0020] Example 1: Reference Figure 1 The present application provides a high-negative-pressure diaphragm pump regulating mechanism, comprising a shell 1, a motor 2 being mounted on the outside of the shell 1, an output end of the motor 2 being connected to a connecting rod assembly 3, and the connecting rod assembly 3 being mounted inside the shell 1, diaphragms 4 being provided on the upper and lower sides of the connecting rod assembly 3, and a first cover body 5 and a second cover body 6 being provided on the outside of the diaphragms 4 on both sides, respectively, the first cover body 5 and the second cover body 6 being docked at the bottom and the top of the shell 1, and an inlet pipe 7 and an outlet pipe 8 being docked on one side of the first cover body 5 and the second cover body 6, respectively, and also comprising an regulating mechanism 9 docked between the connecting rod assembly 3 and the diaphragm 4.

[0021] Among them, reference Figure 2-Figure 3 , Figure 2 This is a schematic diagram of the internal structure of Example 1 of the present application. Figure 3 1 is a schematic diagram of the disassembled structure of the adjustment mechanism in Example 1 of the present application. The adjustment mechanism 9 includes a first adjustment member 91, a first threaded hole 92 is opened in the middle of one side of the first adjustment member 91, and a first threaded shaft 93 is fixed on the side of the first adjustment member 91 away from the first threaded hole 92. The first adjustment member 91 is arranged in a hexagonal shape close to the first threaded shaft 93. The interior of the first threaded hole 92 is connected to the second threaded shaft 94, and the second threaded shaft 94 is connected to the middle of the diaphragm 4. The first threaded shaft 93 is connected to the interior of the second threaded hole 95, and the second threaded hole 95 is opened at the connecting The outside of the rod assembly 3, that is, the first threaded hole 92 and the first threaded shaft 93 are respectively arranged on both sides of the first adjusting member 91 to constitute a high-precision adjustment. By utilizing the pitch difference of the threads at both ends, the adjustment accuracy of the micron level is achieved. Compared with the traditional method of adjusting the internal space of the diaphragm pump by adding or removing gaskets, the adjustment mechanism of the present invention does not require repeated disassembly and installation of gaskets, which greatly simplifies the operating steps. At the same time, since frequent disassembly and installation of gaskets is avoided, the problem of reduced sealing performance due to gasket wear is reduced, thereby improving the long-term stability of the diaphragm pump.

[0022] Among them, the thread rotation direction and pitch difference at both ends of the adjustment mechanism 9 are key parameters. The thread rotation direction and pitch difference are coordinated. If the thread rotation direction is the same, the adjustment accuracy is increased or decreased by |p1-p2| per rotation; if the thread rotation direction is opposite, the adjustment accuracy is increased or decreased by p1+p2 per rotation; if the pitch P=p1=p2 and the rotation direction is opposite, the adjustment accuracy is increased or decreased by 2P per rotation; where P, p1, and p2 are the pitches.

[0023] Specifically, the steps are as follows: S1: Stop the diaphragm pump; S2: Manually rotate the first adjusting member 91 so that the first threaded hole 92 on one side of the first adjusting member 91 is threadedly connected to the second threaded shaft 94, and the first threaded shaft 93 is threadedly connected to the second threaded hole 95, so as to meet the raising or lowering drive of the diaphragm 4, so as to fine-tune the internal space of the diaphragm pump. During the adjustment process, the diaphragm pump can be operated to observe the negative pressure gauge reading; S3: Repeat the S1-S2 process, and stop rotating when the negative pressure reaches the target value; S4: Start the diaphragm pump and check the negative pressure stability. Note: Rotate slowly and evenly to avoid excessive adjustment due to excessive rotation.

[0024] Furthermore, by manually rotating the adjustment mechanism, the pitch difference at both ends is utilized to achieve precise adjustment of the internal space of the diaphragm pump, and the clearance volume between the diaphragm and the valve plate is reduced without disassembling the diaphragm pump, thereby increasing the negative pressure. The pitch difference is designed so that the adjustment amount is equal to the difference in the pitch at both ends for each rotation, thereby achieving high-precision fine-tuning of the internal space of the diaphragm pump.

[0025] Example 2: Reference Figure 4-Figure 5 , Figure 4 This is a schematic diagram of the internal structure of Example 2 of the present application. Figure 5 This is a schematic diagram of the split structure of the adjustment mechanism in Example 2 of the present application. This embodiment is a further development of Example 2. The similarities are not repeated here. The differences are as follows: Among them, the adjustment mechanism 9 includes a second adjustment member 96, a vertical third threaded hole 97 is opened inside the second adjustment member 96, and the middle part of the second adjustment member 96 is hexagonal, and the two sides of the third threaded hole 97 are respectively threadedly connected with the third threaded shaft 98 and the fourth threaded shaft 99, the third threaded shaft 98 is connected to the middle of the diaphragm 4, and the fourth threaded shaft 99 is connected to the outside of the connecting rod assembly 3, and the third threaded shaft 98 is longer than the fourth threaded shaft 99, that is, the threaded connection effect of the third threaded hole 97 set inside the second adjustment member 96 and the third threaded shaft 98 and the fourth threaded shaft 99 is realized to realize the composition of the second adjustment transmission structure to improve the adjustment diversity.

[0026] Specifically, the steps are as follows: S1: Stop the diaphragm pump; S2: Manually rotate the second adjusting member 96 so that the second adjusting member 96 engages with the third threaded shaft 98 and the fourth threaded shaft 99 through the third threaded hole 97 opened in the middle, thereby raising or lowering the diaphragm 4 to fine-tune the internal space of the diaphragm pump. During the adjustment process, the diaphragm pump can be operated to observe the negative pressure gauge reading; S3: Repeat the S1-S2 process, and stop rotating when the negative pressure reaches the target value; S4: Start the diaphragm pump and check the negative pressure stability. Note: Rotate slowly and evenly to avoid excessive adjustment due to excessive rotation.

[0027] Example 3: Reference Figure 6-Figure 7 , Figure 6 This is a schematic diagram of the internal structure of Example 3 of the present application. Figure 7 This is a schematic diagram of the disassembled structure of the adjustment mechanism in Example 3 of the present application. This embodiment is a further expansion of Example 1 and Example 2. The similarities are not repeated here. The differences are as follows: Among them, the adjustment mechanism 9 includes a third adjustment member 910, which is arranged in a hexagonal shape as a whole. A fourth threaded hole 911 is provided on one side of the third adjustment member 910, and a fifth threaded shaft 912 is provided on the other side of the third adjustment member 910. The fourth threaded hole 911 is threadedly connected to the sixth threaded shaft 913, and the sixth threaded shaft 913 is vertically installed in the middle of the diaphragm 4. The fifth threaded shaft 912 is threadedly connected to the fifth threaded hole 914, and the fifth threaded hole 914 is opened on the outside of the connecting rod assembly 3, that is, the fourth threaded hole 911 and the fifth threaded shaft 912 are respectively provided at the upper and lower ends of the third adjustment member 910, so as to realize the composition of the third adjustment transmission structure to meet the precise fine-tuning of the internal space of the diaphragm pump.

[0028] Specifically, the steps are as follows: S1: Stop the diaphragm pump; S2: Manually rotate the third adjusting member 910 so that the third adjusting member 910 is threadedly connected to the sixth threaded shaft 913 through the fourth threaded hole 911 opened on one side, and the fifth threaded shaft 912 is threadedly connected to the fifth threaded hole 914, so as to meet the requirements of raising or lowering the diaphragm 4, so as to fine-tune the internal space of the diaphragm pump. During the adjustment process, the diaphragm pump can be operated to observe the negative pressure gauge reading; S3: Repeat the S1-S2 process, and stop rotating when the negative pressure reaches the target value; S4: Start the diaphragm pump and check the negative pressure stability. Note: Rotate slowly and evenly to avoid excessive adjustment due to excessive rotation.

[0029] Secondly, based on the above scheme, the internal and external threads at both ends of the first adjusting member 91, the second adjusting member 96, and the third adjusting member 910 are not fixed, and the thread rotation direction is not fixed, and can be selected for use according to specific needs; at the same time, the first adjusting member 91, the second adjusting member 96, and the third adjusting member 910 can also be octagonal or other shapes that are convenient for adjustment, and can also extend to both sides, and are not limited to being set in a certain position; the rotation direction can also be marked on it to achieve the purpose of high negative pressure.

[0030] When the above solution is actually applied, by adding an adjustment mechanism 9 between the original diaphragm 4 and the connecting rod assembly 3, manual adjustment is made using the pitch difference, and the accuracy can be controlled by the pitch difference at both ends. For example, the two ends are M4 / M5 coarse threads with the same rotation direction, and the pitch difference is 0.1mm, that is, the clearance height between the diaphragm 4 and the first cover body 5 or the second cover body 6 increases or decreases by 0.1mm for one rotation, or the two ends are M3 coarse and fine threads with the same rotation direction, then the pitch difference is 0.15mm, and the clearance height between the diaphragm 4 and the first cover body 5 or the second cover body 6 increases or decreases by 0.15mm for one rotation. A displacement adjustment amount of 0.0375mm can be obtained for every 1 / 4 rotation, and a displacement adjustment amount of 0.01875mm can be obtained for every 1 / 8 rotation, thereby achieving micron-level adjustment and meeting high-precision adjustment requirements; At the same time, the material of the adjustment mechanism 9 is stainless steel or other high-strength materials such as alloy steel to ensure corrosion resistance and strength. This solution has high adjustment accuracy, which is far superior to the adjustment method of adding gaskets, and avoids the performance degradation problem caused by gasket wear.

[0031] Other solutions: Another solution is to add a dial to the adjustment mechanism 9 to display the rotation angle through the scale, thereby further improving the adjustment accuracy.

[0032] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A high negative pressure diaphragm pump regulating mechanism, comprising a housing (1), a motor (2) being mounted on the outside of the housing (1), an output end of the motor (2) being connected to a connecting rod assembly (3), and the connecting rod assembly (3) being mounted inside the housing (1), a diaphragm (4) being mounted on both upper and lower sides of the connecting rod assembly (3), and a first cover body (5) and a second cover body (6) being mounted on both sides of the outer sides of the diaphragm (4), the first cover body (5) and the second cover body (6) being docked at the bottom and the top of the housing (1), and an inlet pipe (7) and an outlet pipe (8) being docked on one side of the first cover body (5) and the second cover body (6), respectively, wherein: The invention also includes an adjusting mechanism (9) connected between the connecting rod assembly (3) and the diaphragm (4), wherein the adjusting mechanism (9) includes a first adjusting member (91), a first threaded hole (92) is provided in the middle of the first adjusting member (91), a first threaded shaft (93) is fixed to the bottom of the first adjusting member (91), the interior of the first threaded hole (92) is connected to the second threaded shaft (94), and the second threaded shaft (94) is connected to the middle of the diaphragm (4), the first threaded shaft (93) is connected to the interior of the second threaded hole (95), and the second threaded hole (95) is provided on the outside of the connecting rod assembly (3).

2. A high negative pressure diaphragm pump regulating mechanism according to claim 1, characterized in that: The adjusting mechanism (9) includes a second adjusting member (96), a third threaded hole (97) is provided inside the second adjusting member (96), and two sides of the third threaded hole (97) are connected to a third threaded shaft (98) and a fourth threaded shaft (99), respectively. The third threaded shaft (98) is provided in the middle of the diaphragm (4), and the fourth threaded shaft (99) is provided on the outside of the connecting rod assembly (3).

3. The high negative pressure diaphragm pump regulating mechanism according to claim 1, characterized in that: The adjusting mechanism (9) includes a third adjusting member (910), a fourth threaded hole (911) is provided on one side of the third adjusting member (910), and a fifth threaded shaft (912) is provided on the other side of the third adjusting member (910), the interior of the fourth threaded hole (911) is connected to the sixth threaded shaft (913), and the sixth threaded shaft (913) is provided in the middle of the diaphragm (4), the fifth threaded shaft (912) is connected to the fifth threaded hole (914), and the fifth threaded hole (914) is provided on the outside of the connecting rod assembly (3).

4. A high negative pressure diaphragm pump regulating mechanism according to claim 1, characterized in that: The first adjusting member (91) is arranged in a hexagonal shape close to the first threaded shaft (93).

5. The high negative pressure diaphragm pump regulating mechanism according to claim 2, characterized in that: The middle portion of the second adjusting member (96) is arranged in a hexagonal shape.

6. The high negative pressure diaphragm pump regulating mechanism according to claim 3, characterized in that: The third adjusting member (910) is arranged in a hexagonal shape as a whole.

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