Compact isolator for diaphragm pump and manufacturing method

Abstract

The invention discloses an isolator for a compact diaphragm pump and a manufacturing method, the isolator is characterized in that an inner cylinder is sequentially sleeved with a separation cylinder and an outer cylinder, the inner end of the outer cylinder is hermetically connected with the outer side surface of the inner cylinder, and the end part, close to the inner end of the inner cylinder, of the separation cylinder is sealed; a medium high-temperature channel, a medium medium-temperature channel and a medium low-temperature channel are communicated in sequence to form a zigzag cooling isolation channel; the length of the compact isolator for the diaphragm pump is shortened to about one third of that of an existing isolator, the compact isolator for the diaphragm pump is small in occupied area and convenient to install, and most of the inner barrel close to and communicated with the medium cavity is located in the isolator. The high-temperature medium in the medium high-temperature channel enables most of thermal expansion generated by the inner cylinder to be located in the isolator, large axial thermal expansion of the whole isolator cannot be caused, the high-temperature medium is mainly concentrated in the medium high-temperature channel formed in the inner side of the inner cylinder, the temperature of the outer side is low, and good use safety is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid variable displacement mechanical medium pumps, and in particular relates to an isolator for a compact diaphragm pump and a manufacturing method thereof. Background Art

[0002] The diaphragm pump uses air pressure or hydraulic pressure to drive the diaphragm in the cylinder to move back and forth, changing the volume of the pumping medium chamber. Combined with the opening and closing action of the suction valve group and the discharge valve group in the medium chamber as the diaphragm moves back and forth, the purpose of sucking and discharging the conveying medium is achieved. Transporting high-temperature media is a relatively special working condition of diaphragm pumps, and its transportation process has corresponding requirements. In the process of transporting high-temperature media, the temperature of the high-temperature media cannot be reduced from suction to discharge, or the temperature reduction must be controlled within a certain range; when transporting high-temperature media, although the use of metal diaphragms can reduce the impact of high-temperature media on the diaphragm, the corresponding diaphragm pump is large in size, high in cost and is not suitable for transporting liquids containing slurry particles. Therefore, it is a trend to use non-metallic diaphragm pumps to transport high-temperature media, but non-metallic diaphragms are generally not resistant to high temperatures. Therefore, it is necessary to solve the problem of how to cool down the high-temperature medium in contact with the non-metallic diaphragm to make it suitable for contact with the non-metallic diaphragm, and the high-temperature medium after cooling will not be transported and discharged to meet the requirements of the transportation process. It is best to make most of the high-temperature medium after cooling down to maintain the effect of avoiding contact between the pumped high-temperature medium and the non-metallic diaphragm.

[0003] To this end, the applicant has designed a cooling isolator. For details, please refer to Chinese patent CN111502977B, a cooling isolator and an isolation pump. Figure 1 As shown, the cooling isolator includes a main pipe 1, the inside of the main pipe is a medium channel, an axially slidable isolation ring 2 is arranged in the medium channel, and a cooling water jacket 3 is arranged outside the main pipe; when in use, the main pipe is connected between the medium side of the diaphragm pump cylinder 4 and the medium chamber 33, and the suction valve group and the discharge valve group are still respectively arranged at the suction and discharge ends of the medium chamber; in this way, the cooling water jacket cools the medium close to the diaphragm pump cylinder in the medium channel, so that the medium in contact with the diaphragm maintains a relatively low temperature, and the medium channel with a certain length has a certain effect of preventing heat exchange between the media at both ends, producing a cooling isolation effect, and the isolation ring slides with the medium in the medium channel when the medium is agitated back and forth, further improving the cooling isolation effect. Although the cooling isolator solves the problem of non-metallic diaphragm pumps transporting high-temperature media to a certain extent, the required main pipe is relatively long, especially for large high-temperature diaphragm pump units, not only multiple main pipes are required, the overall footprint is relatively large, and the axial thermal expansion of the main pipe is large, the high-temperature zone is relatively long, the safety of use is poor and the maintenance is inconvenient; therefore, it is necessary to design an isolator with compact axial dimensions to reduce the difficulty of installation and use and improve safety. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a compact isolator for a diaphragm pump and a manufacturing method, so as to solve the technical problem that the existing isolators have large axial dimensions, thereby reducing the difficulty of installation and use and improving safety.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A compact isolator for a diaphragm pump comprises an inner cylinder, an outer cylinder is arranged outside the inner cylinder, a cooling water jacket is arranged on the outer cylinder, one end of the inner cylinder extends out of the outer cylinder and forms a medium chamber connection end, and the other end is an inner end, one end of the outer cylinder away from the medium chamber connection end forms a cylinder connection end, and the other end is an inner end and is sealed and connected to the outer side surface of the medium chamber connection end; a separator cylinder is arranged between the inner cylinder and the outer cylinder, the separator cylinder is connected to the inner cylinder or the outer cylinder, the inner side of the inner cylinder forms a medium high-temperature channel, the separator cylinder has a radial spacing with the inner cylinder and forms a medium medium-temperature channel, the separator cylinder has a radial spacing with the outer cylinder and forms a medium low-temperature channel, one end of the separator cylinder close to the cylinder connection end is closed and has a spacing with the inner end of the inner cylinder, and the other end has a spacing with the inner end of the outer cylinder, so that the medium high-temperature channel, the medium medium-temperature channel and the medium low-temperature channel are connected in sequence to form a tortuous cooling isolation channel.

[0007] Furthermore, an air jacket is provided on the inner cylinder, and the outer side surface of the inner cylinder and the air jacket form a gas heat-insulating cavity.

[0008] Furthermore, an expansion joint is sealedly connected between one end of the air jacket close to the medium chamber connection end and the inner end of the outer cylinder, and the expansion joint is in communication with the air jacket.

[0009] Furthermore, the air jacket is connected with a ventilation pipe, and the free end of the ventilation pipe is formed as a gas exchange end and is close to the inner wall of the outer cylinder.

[0010] Furthermore, the connection point between the vent pipe and the air jacket and the gas exchange end are respectively located on two sides of a radial direction of the air jacket.

[0011] Further, the vent pipe includes a semicircular middle pipe section coaxially arranged outside the air jacket, one end of the middle pipe section is connected with an upper pipe section extending outward along the diameter direction of the middle pipe section, the free end of the upper pipe section is formed as a gas exchange end, the other end of the middle pipe section is connected with a lower pipe section extending inward along the diameter direction of the middle pipe section, the free end of the lower pipe section is connected to and fixed to the air jacket,

[0012] Furthermore, the vent pipe is located between the inner end of the outer cylinder and the open end of the partition cylinder, and the lower pipe section is connected to a sewage pipe section extending outward along the diameter direction of the middle pipe section. The sewage pipe section seals and passes through the outer cylinder and is provided with a sewage valve.

[0013] Furthermore, the lower pipe section is connected to the sewage pipe section through the U-shaped pipe section, and the opening width direction of the U-shaped pipe section corresponds to the diameter direction of the middle pipe section.

[0014] Furthermore, the inner end of the outer cylinder is connected to a head, and the middle of the head has an opening that matches the outer diameter of the inner cylinder. The medium chamber connecting end extends out of the outer cylinder through the opening and is sealed and connected. A heat sink is provided on the outer surface of the head, and the partition cylinder is made of insulating material.

[0015] The present invention also includes a method for manufacturing the compact diaphragm pump isolator, comprising the following steps:

[0016] 1) The inner cylinder is passed through the opening of the head and sealed, the end of the inner cylinder on the convex surface of the head is formed as the medium chamber connection end, and a heat sink is installed on the convex surface of the head;

[0017] 2) Install an air jacket outside the inner cylinder on one side of the concave surface of the head, so that the air jacket opens toward one end of the head and is sealed and connected to the concave surface of the head through an expansion joint;

[0018] 3) The middle pipe section of the ventilation pipe is arranged outside the air jacket, and the inner end of the lower pipe section is fixed and connected to the air jacket to obtain a first assembly;

[0019] 4) Install a cooling water jacket outside the outer cylinder, coaxially fix the partition cylinder inside the outer cylinder, and make the open end of the partition cylinder and the inner end of the outer cylinder be located at the same end, thereby obtaining a second assembly;

[0020] 5) Apply opposite forces to the two ends of the vent pipe to make the two sides of the U-shaped pipe section gather and deform, and the two ends of the vent pipe shrink inward, and put the first assembly into the partition cylinder from the inner end of the outer cylinder with the inner end of the inner cylinder as the first;

[0021] 6) Push the part of the first assembly located on the concave side of the head into the second assembly, so that the two ends of the vent pipe reach the groove and the clearance hole respectively, and the vent pipe without restraint recovers under the action of its own elastic force, and the two ends of the vent pipe fall into the groove and pass through the clearance hole respectively;

[0022] 7) Weld the end of the head to the inner end of the outer cylinder to seal, and seal and weld the ventilation pipe to the clearance hole of the outer cylinder.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The compact isolator for a diaphragm pump described in the present invention replaces the axially extending medium channel in the existing isolator with a radially tortuous cooling isolation channel, so that the length of the compact isolator for a diaphragm pump is shortened to about one-third of the existing isolator. It not only occupies a smaller area and is convenient for installation and use; the radially tortuous cooling isolation channel has a stronger effect in preventing heat exchange between the media at both ends, and has a better cooling isolation effect than the axially extending medium channel in the existing isolator.

[0025] 2. In the isolator for the compact diaphragm pump described in the present invention, most of the inner cylinder body that is close to and connected to the medium chamber is located inside the isolator. The thermal expansion of the inner cylinder body caused by the medium with a higher temperature in the medium high-temperature channel is also mostly located inside the isolator, which will not cause a large axial thermal expansion of the isolator as a whole; the high-temperature medium is mainly concentrated in the medium high-temperature channel formed inside the inner cylinder body, and the temperature outside is lower, which has better safety in use.

[0026] 3. In the isolator for the compact diaphragm pump described in the present invention, the separation cylinder made of the air jacket and the insulation material can effectively reduce the radial transfer of the medium heat in the medium high-temperature channel, the medium medium-temperature channel and the medium low-temperature channel, and cooperate with the cooling operation provided by the heat sink and the water-cooling jacket to make the medium temperature in the medium high-temperature channel, the medium medium-temperature channel and the medium low-temperature channel decrease in a gradient, so that the medium in contact with the cylinder diaphragm in the medium low-temperature channel always maintains a low temperature to ensure the stable operation of the diaphragm pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the cooling isolator described in the background technology being used to isolate the pump;

[0028] Figure 2 A front view showing the interior of the isolator for a compact diaphragm pump according to an embodiment, which is cut along a radial direction;

[0029] Figure 3 For the isolator along Figure 2 The cross-sectional schematic diagram of the structure such as AA in the middle and the isolation ring is hidden;

[0030] Figure 4 is a schematic structural diagram of the ventilation pipe described in the embodiment;

[0031] Figure 5 This is a schematic diagram of the structure in which the inner cylinder, expansion joint, air jacket and vent pipe are assembled into one piece according to the embodiment;

[0032] Figure 6 This is a schematic diagram of the structure in which the separation cylinder, the outer cylinder and the cooling water jacket are integrated into one body according to the embodiment;

[0033] Figure 7 It is a schematic diagram of the isolator for the compact diaphragm pump described in the embodiment being used to isolate the pump;

[0034] Figure 8 for Figure 2 A three-dimensional diagram B of the structure shown in the state (without the isolation ring and other components);

[0035] Fig. 9 for Figure 2 A three-dimensional diagram C of the structural state shown (without the isolation ring and other components);

[0036] Among them, the main pipeline 1, the isolation ring 2, the cooling water jacket 3, the cylinder body 4, the inner cylinder 5, the outer cylinder 6, the medium chamber connection end 7, the cylinder body connection end 8, the partition cylinder 9, the medium high-temperature channel 10, the medium medium-temperature channel 11, the medium low-temperature channel 12, the diaphragm 13, the air jacket 14, the gas insulation cavity 15, the expansion joint 16, the vent pipe 17, the intermediate pipe section 18, the upper pipe section 19, the lower pipe section 20, the sewage pipe section 21, the sewage valve 22, the head 23, the U-shaped pipe section 24, the support column 25, the groove 26, the give way hole 27, the heat sink 28, the connecting plate 29, the bracket 30, the guide rod 31, the cylindrical helical compression spring 32, and the medium chamber 33. DETAILED DESCRIPTION

[0037] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] Example:

[0039] See also Figure 2 , Figure 8 and Fig. 9 A compact isolator for a diaphragm pump includes an inner cylinder 5, an outer cylinder 6 is arranged outside the inner cylinder 5, a cooling water jacket 3 is arranged on the outer cylinder 6, one end of the inner cylinder 5 extends out of the outer cylinder 6 and forms a medium chamber connection end 7, and the other end is an inner end, and one end of the outer cylinder 6 away from the medium chamber connection end 7 is formed as a cylinder connection end 8, and the other end is an inner end and is sealed and connected to the outer side of the medium chamber connection end 7; a separation cylinder 9 is sleeved between the inner cylinder 5 and the outer cylinder 6, and the separation cylinder 9 is connected to the inner cylinder 5 or the outer cylinder 6 The inner side of the inner cylinder 5 is formed into a medium high-temperature channel 10, the partition cylinder 9 has a radial spacing with the inner cylinder 5 and forms a medium medium-temperature channel 11, the partition cylinder 9 has a radial spacing with the outer cylinder 6 and forms a medium low-temperature channel 12, one end of the partition cylinder 9 close to the cylinder connection end 8 is closed and has a spacing with the inner end of the inner cylinder 5, and the other end has a spacing with the inner end of the outer cylinder 6, so that the medium high-temperature channel 10, the medium medium-temperature channel 11 and the medium low-temperature channel 12 are connected in sequence to form a tortuous cooling isolation channel.

[0040] The compact isolator for a diaphragm pump of the present invention is used as follows: Figure 7As shown, the isolator is horizontally connected between the cylinder body 4 and the medium chamber 33 of the diaphragm pump, the cylinder body connection end 8 (right end) is connected to the cylinder body 4, and the medium chamber connection end 7 (left end) is connected to the medium chamber 33. When the diaphragm 13 of the diaphragm pump cylinder body 4 is agitated back and forth, the medium temperature in the medium high-temperature channel 10 close to and directly connected to the medium chamber 33 is the highest, and cooling water is introduced into the cooling water jacket 3 outside the outer cylinder 6 to cool the medium, so that the medium temperature in the medium medium-temperature channel 11 and the medium low-temperature channel 12 is reduced in turn, and the medium temperature in the medium low-temperature channel 12 is the lowest, thereby avoiding the high medium temperature from affecting the diaphragm 13 and ensuring the normal operation of the diaphragm pump.

[0041] The compact diaphragm pump isolator of the present invention is a device that sequentially sleeves a partition cylinder 9 and an outer cylinder 6 outside an inner cylinder 5, seals the inner end of the outer cylinder 6 with the outer side of the inner cylinder 5, and closes the end of the partition cylinder 9 close to the inner end of the inner cylinder 5, so that a tortuous cooling isolation channel is formed inside, which is connected in sequence by a medium high-temperature channel 10, a medium medium-temperature channel 11, and a medium low-temperature channel 12. The present invention replaces the axially extending medium channel in the existing isolator with a radially tortuous cooling isolation channel, so that the length of the compact diaphragm pump isolator is shortened to about one-third of the existing isolator, which not only occupies a small area and is convenient to install and use, but also has a good connection with the medium chamber 33. Most of the closely connected inner cylinder 5 is located inside the isolator. The medium with higher temperature in the medium high-temperature channel 10 causes most of the thermal expansion of the inner cylinder 5 to be located inside the isolator, which will not cause large axial thermal expansion of the isolator as a whole. The high-temperature medium is mainly concentrated in the medium high-temperature channel 10 formed on the inner side of the inner cylinder 5, and the temperature on the outside is lower, which has better safety in use. In addition, the radially tortuous cooling isolation channel has a stronger effect in preventing heat exchange between the media at both ends, and has a better cooling isolation effect than the axially extending medium channel in the existing isolator. The present invention can effectively solve the problem of large axial size of the existing isolator, which is conducive to reducing the difficulty of installation and use and improving safety.

[0042] See also Figure 2 and Figure 8 An air jacket 14 is provided on the inner cylinder 5, and the outer side surface of the inner cylinder 5 and the air jacket 14 form a gas insulation cavity 15; in this way, the gas insulation cavity 15 exists between the medium high-temperature channel 10 and the medium medium-temperature channel 11, and the gas has a good insulation effect, which can effectively reduce the radial transfer of medium heat in the medium high-temperature channel 10 and the medium medium-temperature channel 11, so that the medium temperature in the medium high-temperature channel 10, the medium medium-temperature channel 11 and the medium low-temperature channel 12 is gradually reduced, so that the medium in the medium medium-temperature channel 11 and the medium low-temperature channel 12 can maintain a low temperature under the cooling effect provided by the cooling water jacket 3.

[0043] See also Figure 2 and Figure 8An expansion joint 16 is sealed between one end of the air jacket 14 close to the medium chamber connection end 7 and the inner end of the outer cylinder 6, and the expansion joint 16 is communicated with the air jacket 14; the expansion joint 16 is also called a compensator or telescopic joint, which is mainly composed of a bellows and end pipes connected at both ends, and is a flexible element used to compensate for axial deformation; in this way, in the compact diaphragm pump isolator, the inner end of the outer cylinder 6 is connected to the left end of the air jacket 14 through the expansion joint 16, which will not affect the flow of the medium in the cooling isolation channel, and the other end of the air jacket 14 is connected to the inner cylinder 5. When the inner cylinder 5 undergoes thermal expansion, the expansion joint 16 can not only compensate for the axial deformation of the air jacket 14, but also help to reduce the thermal expansion of the inner cylinder 5.

[0044] See also Figure 2 and Figure 8 The air jacket 14 is connected with a vent pipe 17, and the free end of the vent pipe 17 is formed as a gas exchange end and is close to the inner wall of the outer cylinder 6; in this way, when the compact diaphragm pump isolator is installed and used, it is arranged horizontally as a whole, with the free end of the vent pipe 17 facing upward and close to the upper vertex of the inner wall of the outer cylinder 6. When the diaphragm pump is running, the residual air in the upper part of the space of the medium low-temperature channel 12 can be squeezed and collected into the air jacket 14 through the vent pipe 17, and the air can be retained all the time, so that the pressure in the air jacket 14 is close to or balanced with the pressure in the cooling isolation channel, so as to reduce its thickness while ensuring that the air jacket 14 maintains structural stability, which is beneficial to reduce the manufacturing cost and the weight of the isolator and improve the economy.

[0045] See also Figure 3 and Figure 4 The connection point between the vent pipe 17 and the air jacket 14 and the gas exchange end are respectively located on both sides of a radial direction of the air jacket 14; in this way, each time the gas in the cooling isolation channel is squeezed through the vent pipe 17 to enter the air jacket 14, it enters from the bottom of the air jacket 14. The gas in the air jacket 14 is constantly exchanged up and down with the operation of the diaphragm pump, which is conducive to making the internal pressure distribution of the air jacket 14 uniform and maintaining the stability of the structure.

[0046] Specifically, during implementation, a vent pipe 17 may be provided to seal and pass through the upper side of the air jacket 14, the upper side of the inner cylinder 5 and the lower side of the inner cylinder 5 in sequence from top to bottom along the radial direction of the inner cylinder 5, so as to communicate with the lower part of the gas insulation chamber 15. However, the vent pipe 17 passing through the inner cylinder 5 will not only be impacted by the high-temperature medium and easily damaged, but also cause the temperature of the gas inside it to rise sharply and the internal pressure to increase, which will affect the gas entering and exiting the gas insulation chamber 15. Therefore, in this embodiment, the vent pipe 17 is designed to include a semicircular intermediate pipe section 18 coaxially arranged outside the air jacket 14, and the intermediate pipe section 18 is provided outside the air jacket 14. One end of the segment 18 is connected to an upper tube segment 19 extending outward along the diameter direction of the middle tube segment 18, and the free end of the upper tube segment 19 is formed as a gas exchange end. The other end of the middle tube segment 18 is connected to a lower tube segment 20 extending inward along the diameter direction of the middle tube segment 18, and the free end of the lower tube segment 20 is connected to and fixed with the air jacket 14; in this way, the vent pipe 17 bypasses the air jacket 14 through the semicircular middle tube segment 18 and is connected to the lower side thereof, which is not only convenient for manufacturing and assembly, but also helps to ensure that the gas insulation cavity 15 realizes gas exchange and retention through the vent pipe 17.

[0047] See also Figure 3 and Figure 4 The vent pipe 17 is located between the inner end of the outer cylinder 6 and the open end of the partition cylinder 9. The lower pipe section 20 is connected to a sewage pipe section 21 extending outward along the diameter direction of the middle pipe section 18. The sewage pipe section 21 is sealed and passes through the outer cylinder 6 and is provided with a sewage valve 22. In this way, during maintenance, the sewage valve 22 can be opened to discharge the medium that accidentally enters the vent pipe 17 from the cooling isolation channel.

[0048] See also Figure 2 and Figure 8 In order to make the inner end of the outer cylinder 6 and the outer side surface of the medium chamber connection end 7 sealed and connected, the following structure is specifically adopted: a head 23 is connected to the inner end of the outer cylinder 6, and the middle part of the head 23 has an opening adapted to the outer diameter of the inner cylinder 5, and the medium chamber connection end 7 extends out of the outer cylinder 6 through the opening and is sealed and connected; see Figure 3 and Figure 4 , the lower pipe section 20 is connected to the sewage pipe section 21 through the U-shaped pipe section 24, and the opening width direction of the U-shaped pipe section 24 corresponds to the diameter direction of the middle pipe section 18;

[0049] In this way, the U-shaped pipe section 24 is a position on the vent pipe 17 that is easily deformed by radial force. During assembly, the vent pipe 17 can be radially squeezed so as to be installed into the outer cylinder 6. Specifically, during assembly, the inner cylinder 5, the end cap 23, the expansion joint 16, the air jacket 14 and the vent pipe 17 are first assembled as follows: Figure 5 In the state shown, the vent pipe 17 is fixed to the outside of the air jacket 14 through the lower pipe section 20, and the partition cylinder 9, the outer cylinder 6 and the cooling water jacket 3 are assembled as shown. Figure 6In the state shown, the partition cylinder 9 is connected to the outer cylinder 6 through the radially arranged support column 25, and a groove 26 adapted to the free end of the upper pipe section 19 is arranged on the inner wall of the inner end of the outer cylinder 6. The groove 26 can reduce the possibility of the medium entering the vent pipe 17. A clearance hole 27 adapted to the sewage pipe section 21 is arranged on the inner end of the outer cylinder 6. The groove 26 and the clearance hole 27 are arranged radially opposite to each other; then, force is applied inwardly to both ends of the vent pipe 17 to gather and deform the two sides of the U-shaped pipe section 24, so that the two ends of the vent pipe 17 shrink inward, and the Figure 5 The overall installation shown Figure 6 In the whole shown, after losing pressure, both ends of the vent pipe 17 rebound and fall into the groove 26 and pass through the clearance hole 27 respectively; finally, the head 23 is welded to the inner end of the outer cylinder 6, and the sewage pipe section 21 is welded to the clearance hole 27 of the outer cylinder 6.

[0050] See also Figure 2 and Figure 8 , a heat sink 28 is provided on the outer surface of the head 23; thus, the heat sink 28 is located at the junction of the medium medium temperature channel 11 and the medium low temperature channel 12, which is beneficial to reduce the temperature of the medium entering the medium low temperature channel 12, so as to cooperate with the cooling water jacket 3 to maintain a relatively low temperature of the medium reaching the diaphragm 13;

[0051] See also Figure 2 and Figure 3 In order to facilitate manufacturing and assembly, the separation tube is designed to be composed of four parts evenly divided in the circumferential direction, and two adjacent parts are connected by a connecting plate 29; in addition, the separation tube adopts a heat-insulating material, such as a polytetrafluoroethylene plate, to reduce the radial transfer of medium heat in the medium medium-temperature channel 11 and the medium low-temperature channel 12, so that the medium temperature in the medium high-temperature channel 10, the medium medium-temperature channel 11 and the medium low-temperature channel 12 is gradually reduced, so that the medium in the medium low-temperature channel 12 can maintain a low temperature under the cooling effect provided by the cooling water jacket 3.

[0052] See also Figure 2 and Figure 8 In order to improve the cooling and isolation effect of the isolator for the compact diaphragm pump, an isolation ring 2 is also arranged inside. The specific structure is as follows: a coaxially arranged guide rod 31 is connected to the inner cylinder 5 through a bracket 30, and a cylindrical isolation ring 2 is slidably sleeved on the guide rod 31. Elastic elements are respectively sleeved on the guide rod 31 sections at both ends of the isolation ring 2. The two elastic elements are each compressed between the end face of the corresponding end of the isolation ring 2 and the bracket 30. The elastic element adopts a cylindrical helical compression spring 32.

[0053] In this embodiment, the radial dimension of one side of the gas insulation cavity 15 is designed to be 6-7 mm, so that the volume occupied by the gas insulation cavity 15 is relatively small, and the residual air in the upper part of the medium low-temperature channel 12 can be filled; the diameter of the medium high-temperature channel 10 is 250 mm, the diameter of the medium medium-temperature channel 11 is 430 mm, and the diameter of the medium low-temperature channel 12 is 600 mm. The thickness of the part of the inner cylinder 5 located inside the outer cylinder 6 is 8 mm, so that it can meet the rigidity and wear resistance. Then the outer diameter of the inner cylinder 5 is 250+8+8=266 mm, the inner diameter of the air jacket 14 is 266+6+6=278 mm, and the length of the medium high-temperature channel 10 is designed to be 900 mm. The volume of the air jacket 14 is 3.142*0.278*0.9*0.006=4.71*10- 3 =4.71 liters, plus about 0.2 liters of expansion joint 16, a total of 4.91 liters; when the liquid inlet height of the isolator reaches the high temperature channel 10 of the medium, there is about (600-250) / 2=175mm on the top, the inner length is 900mm + the length of the two flow channels on the right is 300mm + the inner 200 of the heads 23 on both sides is 1400mm, and the volume of the upper half of the circle is about 1 / 5 of the entire maximum volume, which is 3.142*0.3*0.3*1.4 / 5=0.0792 Square = 79.2 liters, the ratio is 79.2 / 4.91=16.1 times, then the internal air jacket 14 can be compressed 16 times, which can achieve a better pressure stabilizing effect; during implementation, the opening positions of the medium chamber connecting end 7 and the cylinder connecting end 8 can also be eccentric downward to enlarge the gas retention space on the upper side, which can be 1 / 4 of the entire maximum volume, then 79.2*5 / 4=99 liters, which is enlarged by 1.25 times, and the ratio is 16.1*1.25=20.1 times, which has a better pressure stabilizing effect.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A compact isolator for a diaphragm pump, characterized in that: It includes an inner cylinder, an outer cylinder is arranged outside the inner cylinder, a cooling water jacket is arranged on the outer cylinder, one end of the inner cylinder extends out of the outer cylinder and forms a medium chamber connection end, and the other end is an inner end, one end of the outer cylinder away from the medium chamber connection end forms a cylinder connection end, and the other end is an inner end and is sealed and connected to the outer side surface of the medium chamber connection end; a separator cylinder is arranged between the inner cylinder and the outer cylinder, the separator cylinder is connected to the inner cylinder or the outer cylinder, the inner side of the inner cylinder is formed as a medium high-temperature channel, the separator cylinder and the inner cylinder have a radial spacing and form a medium medium-temperature channel, the separator cylinder and the outer cylinder have a radial spacing and form a medium low-temperature channel, one end of the separator cylinder close to the cylinder connection end is closed and has a spacing with the inner end of the inner cylinder, and the other end has a spacing with the inner end of the outer cylinder, so that the medium high-temperature channel, the medium medium-temperature channel and the medium low-temperature channel are connected in sequence to form a tortuous cooling isolation channel.

2. A compact isolator for a diaphragm pump according to claim 1, characterized in that: An air jacket is arranged on the inner cylinder, and the outer side surface of the inner cylinder and the air jacket form a gas heat insulation cavity.

3. A compact isolator for a diaphragm pump according to claim 2, characterized in that: An expansion joint is sealedly connected between one end of the air jacket close to the medium chamber connection end and the inner end of the outer cylinder, and the expansion joint is communicated with the air jacket.

4. A compact isolator for a diaphragm pump according to claim 2, characterized in that: The air jacket is connected with a vent pipe, and the free end of the vent pipe is formed as a gas exchange end and is close to the inner wall of the outer cylinder.

5. A compact isolator for a diaphragm pump according to claim 4, characterized in that: The connecting point between the vent pipe and the air jacket and the gas exchange end are respectively located on two sides of a radial direction of the air jacket.

6. A compact isolator for a diaphragm pump according to claim 5, characterized in that: The ventilation pipe includes a semicircular middle pipe section coaxially arranged outside the air jacket, one end of the middle pipe section is connected to an upper pipe section extending outward along the diameter direction of the middle pipe section, the free end of the upper pipe section is formed as a gas exchange end, the other end of the middle pipe section is connected to a lower pipe section extending inward along the diameter direction of the middle pipe section, and the free end of the lower pipe section is connected to and fixed to the air jacket.

7. A compact isolator for a diaphragm pump according to claim 6, characterized in that: The vent pipe is located between the inner end of the outer cylinder and the open end of the partition cylinder. The lower pipe section is connected to a sewage pipe section extending outward along the diameter direction of the middle pipe section. The sewage pipe section passes through the outer cylinder in a sealed manner and is provided with a sewage valve.

8. A compact isolator for a diaphragm pump according to claim 7, characterized in that: The lower pipe section is connected to the sewage pipe section through the U-shaped pipe section, and the opening width direction of the U-shaped pipe section corresponds to the diameter direction of the middle pipe section.

9. A compact isolator for a diaphragm pump according to claim 8, characterized in that: The inner end of the outer cylinder is connected to a sealing head, and the middle of the sealing head has an opening matched with the outer diameter of the inner cylinder. The medium chamber connecting end extends out of the outer cylinder through the opening and is sealed and connected. A heat sink is provided on the outer surface of the sealing head, and the separating cylinder is made of insulating material.

10. A method for manufacturing a compact isolator for a diaphragm pump as claimed in claim 9, characterized in that: The steps include: 1) The inner cylinder is passed through the opening of the head and sealed, the end of the inner cylinder on the convex surface of the head is formed as the medium chamber connection end, and a heat sink is installed on the convex surface of the head; 2) Install an air jacket outside the inner cylinder on one side of the concave surface of the head, so that the air jacket opens toward one end of the head and is sealed and connected to the concave surface of the head through an expansion joint; 3) The middle pipe section of the ventilation pipe is arranged outside the air jacket, and the inner end of the lower pipe section is fixed and connected to the air jacket to obtain a first assembly; 4) Install a cooling water jacket outside the outer cylinder, coaxially fix the partition cylinder in the outer cylinder, and make the open end of the partition cylinder and the inner end of the outer cylinder be at the same end, thereby obtaining a second assembly; 5) Apply opposite forces to the two ends of the vent pipe to make the two sides of the U-shaped pipe section gather and deform, and the two ends of the vent pipe shrink inward, and put the first assembly into the partition cylinder from the inner end of the outer cylinder with the inner end of the inner cylinder as the first; 6) Push the part of the first assembly located on the concave side of the head into the second assembly, so that the two ends of the vent pipe reach the groove and the clearance hole respectively. The vent pipe without restraint recovers under the action of its own elastic force, and the two ends of the vent pipe fall into the groove and pass through the clearance hole respectively; 7) Weld the end of the head to the inner end of the outer cylinder to seal, and seal and weld the ventilation pipe at the clearance hole of the outer cylinder.

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