Epoxy propane recovery structure

Abstract

The utility model relates to an epoxypropane recovery structure which comprises a barrel bag buried underground, the top of the barrel bag is fixedly connected with a cover plate, the top of the cover plate is annularly provided with a liquid inlet and a liquid outlet at intervals around the central axis, the top of the cover plate is provided with a motor, and the bottom of the cover plate is fixedly connected with a pump sleeve under the motor. A shaft barrel is arranged in the middle of the pump sleeve, the top of the shaft barrel is fixedly connected with the cover plate, a liquid conveying space used for pump liquid is reserved between the outer wall of the shaft barrel and the pump sleeve, and a connecting pipe communicated with the liquid outlet is arranged above the liquid conveying space. The utility model relates to the technical field of chemical equipment. According to the epoxypropane recovery structure, the barrel bag is buried underground, the pump sleeve located in the barrel bag is also located underground, a certain amount of liquid can be kept in the barrel bag where the impeller is located, the first-stage impeller has a certain backward flowing height, and the cavitation resistance can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a propylene oxide recovery structure. Background Art

[0002] Propylene oxide is an important organic compound widely used in chemical engineering and materials science. Propylene oxide is toxic and irritating to the skin and mucous membranes, potentially causing respiratory discomfort and skin burns. Therefore, appropriate safety measures should be taken during handling and storage, such as wearing protective equipment and operating in a well-ventilated environment.

[0003] Since propylene oxide is widely used in the fields of chemical engineering and materials science, residual propylene oxide will be present in the exhaust gas after chemical operations are completed. For example, in the production of carbon dioxide-based polycarbonate polyols, the reaction degree of propylene oxide is about 85%, resulting in 15% propylene oxide in the exhaust gas. Propylene oxide is also toxic to a certain extent, so the direct emission of exhaust gas will not only pollute the environment, but also create a hazardous area at the emission point.

[0004] In the existing technology, in order to avoid the hazards caused by propylene oxide, the propylene oxide that does not participate in the reaction needs to be recycled and reused. The recycled and collected propylene oxide is usually transported by a shielded pump. The shielded pump adopts a static seal design without a dynamic seal, so it can safely transport flammable, explosive, precious liquids and toxic, corrosive and radioactive liquids. However, the shielded pump cannot operate at a low flow rate for a long time. Long-term low flow may cause cavitation, which will affect the service life of the shielded pump. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a propylene oxide recovery structure to solve the technical problems mentioned in the above background technology.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A propylene oxide recovery structure includes a barrel bag buried underground, a cover plate fixedly connected to the top of the barrel bag, a liquid inlet and a liquid outlet arranged at annular intervals on the top of the cover plate along a central axis, a motor mounted on the top of the cover plate, a pump sleeve fixedly connected to the bottom of the cover plate directly below the motor, a shaft cylinder provided in the middle of the pump sleeve, the top of the shaft cylinder fixedly connected to the cover plate, an infusion space for pumping liquid reserved between the outer wall of the shaft cylinder and the pump sleeve, and a connecting pipe connected to the liquid outlet provided above the infusion space;

[0008] The outer peripheral wall of the shaft cylinder is connected to a plurality of impellers in a rotational manner from top to bottom, and the inner peripheral wall of the impeller is embedded with a plurality of permanent magnets 1. A rotating shaft is provided in the shaft cylinder, the top of the rotating shaft is fixedly connected to the output shaft of the motor, and the outer peripheral wall of the rotating shaft is provided with a plurality of permanent magnets 2 in an annular array;

[0009] A liquid level alarm component is provided at the bottom of the barrel bag.

[0010] Furthermore, the pump sleeve is divided into a cylinder and a pump body from top to bottom, the connecting pipe is fixedly connected to the outer wall of the cylinder, the diameter of the pump body is larger than the diameter of the cylinder, so that a pump cavity for accommodating the impeller is retained between the inner wall of the pump body and the shaft cylinder.

[0011] Furthermore, a liquid suction port is formed on the bottom protrusion of the pump body, and a shaft sleeve is sleeved on the outer wall of the shaft cylinder located inside the liquid suction port, and a plurality of spiral blades are fixedly connected to the outer wall of the shaft sleeve.

[0012] Furthermore, the liquid level alarm assembly includes a column, a guide rod, an anti-falling block, a float and a pressure touch switch. The column is fixed at the bottom of the barrel bag, the top of the column is fixedly connected to the guide rod, the outer wall of the guide rod is slidably connected to the float, the top of the guide rod is fixedly connected to the anti-falling block for preventing the float from falling off, and the top of the column is located on one side of the guide rod and is fixedly connected to the pressure touch switch.

[0013] Furthermore, a filter screen is fixedly connected to the outer peripheral wall of the float, and a side of the filter screen close to the pump sleeve is provided with an avoidance hole for avoiding the pump sleeve.

[0014] Furthermore, a waterproof cover is provided on the top of the pressure touch switch, and the bottom of the waterproof cover extends downward and is fixedly connected to the column, so that a sealed space for accommodating the pressure touch switch is formed between the waterproof cover and the column.

[0015] In summary, the present invention has at least one of the following beneficial technical effects:

[0016] 1. This propylene oxide recovery structure buries the barrel bag underground, so that the pump sleeve inside the barrel bag is also underground, so that the barrel bag where the impeller is located can retain a certain amount of liquid. The first-stage impeller has a certain backflow height, which can effectively improve the cavitation resistance;

[0017] 2. This propylene oxide recovery structure can isolate the impeller from the rotating shaft through the provided shaft cylinder, thereby changing the original conventional pump's one shaft with a shaft seal component to a rotating shaft plus shaft cylinder structure, converting the dynamic seal into a static seal, and isolating the rotating shaft and impeller by the shaft cylinder, thereby completely solving the problem of medium leakage.

[0018] 3. This propylene oxide recovery structure can be used to prevent the motor in the barrel bag from idling through the liquid level alarm component, thereby preventing the motor from continuing to run after the propylene oxide material is evacuated and discharging the liquid stored in the impeller, thereby further improving the anti-cavitation performance. At the same time, actively shutting down the motor after the propylene oxide material in the barrel bag is evacuated can also avoid power loss and improve the practicality of the recovery structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a structural schematic diagram of a propylene oxide recovery structure of the utility model.

[0021] Figure 2 This is a schematic cross-sectional structural diagram of a tubular bag in a propylene oxide recovery structure of the present invention.

[0022] Figure 3 This is a schematic cross-sectional structural diagram of a pump sleeve in a propylene oxide recovery structure of the utility model.

[0023] Figure 4 This is a schematic cross-sectional structural diagram of a shaft cylinder in a propylene oxide recovery structure of the present invention.

[0024] Figure 5 The utility model is a structural schematic diagram of a liquid level alarm component in a propylene oxide recovery structure.

[0025] Figure 6 This is a structural schematic diagram of a rear side sectional view of a pressure touch switch in a propylene oxide recovery structure of the present invention.

[0026] In the figure, 1. barrel bag; 2. cover plate; 3. liquid inlet; 4. liquid outlet; 5. motor; 6. pump sleeve; 61. barrel; 62. pump body; 7. shaft cylinder; 8. impeller; 9. permanent magnet 1; 10. rotating shaft; 11. permanent magnet 2; 12. liquid level alarm assembly; 121. column; 122. guide rod; 123. anti-drop block; 124. float; 125. touch switch; 13. connecting pipe; 14. liquid suction port; 15. shaft sleeve; 16. blade; 17. filter; 18. avoidance hole; 19. waterproof cover. DETAILED DESCRIPTION

[0027] The present invention will be described in further detail below with reference to the accompanying drawings. Example

[0028] Reference Figure 1 - Figure 6 The utility model discloses a propylene oxide recovery structure, which includes a barrel bag 1 buried underground, a cover plate 2 fixedly connected to the top of the barrel bag 1, a liquid inlet 3 and a liquid outlet 4 arranged at intervals of a central axis on the top of the cover plate 2, a motor 5 is installed on the top of the cover plate 2, and a pump sleeve 6 is fixedly connected to the bottom of the cover plate 2 just below the motor 5. A shaft cylinder 7 is provided in the middle of the pump sleeve 6, and the top of the shaft cylinder 7 is fixedly connected to the cover plate 2. An infusion space for pumping liquid is reserved between the outer wall of the shaft cylinder 7 and the pump sleeve 6, and a connecting pipe 13 connected to the liquid outlet 4 is provided above the infusion space;

[0029] The outer peripheral wall of the shaft cylinder 7 is connected to a plurality of impellers 8 in a rotatable manner from top to bottom at intervals. The inner peripheral wall of the impeller 8 is embedded with a plurality of permanent magnets 9. A rotating shaft 10 is provided in the shaft cylinder 7. The top of the rotating shaft 10 is fixedly connected to the output shaft of the motor 5. The outer peripheral wall of the rotating shaft 10 is provided with a plurality of permanent magnets 11 in an annular array.

[0030] A liquid level alarm assembly 12 is provided at the bottom of the tubular bag 1 .

[0031] In this embodiment, the observation Figure 1 and Figure 2 It can be found that by setting a cylindrical bag 1 buried underground, a cover plate 2 is fixedly connected to the top of the cylindrical bag 1, and multiple pipelines are arranged on the top of the cover plate 2 at intervals along the central axis, two of which are the liquid inlet 3 and the liquid outlet 4, which can be used to transport the propylene oxide material into the cylindrical bag 1 through the liquid inlet 3 and output it from the liquid outlet 4, so that the propylene oxide material can be transported normally.

[0032] Then look at Figure 2 It can be found that a motor 5 is installed on the top of the cover plate 2, and a pump sleeve 6 is fixedly connected to the bottom of the cover plate 2 just below the motor 5. A shaft cylinder 7 is provided in the middle of the pump sleeve 6, and the top of the shaft cylinder 7 is fixedly connected to the cover plate 2. An infusion space for pumping liquid is reserved between the outer wall of the shaft cylinder 7 and the pump sleeve 6. The outer peripheral wall of the shaft cylinder 7 is connected with multiple impellers 8 in a rotational manner from top to bottom, and the inner peripheral wall of the impeller 8 is embedded with multiple permanent magnets 9. A rotating shaft 10 is provided in the shaft cylinder 7, and the top of the rotating shaft 10 is fixedly connected to the output shaft of the motor 5. The outer peripheral wall of the rotating shaft 10 is provided with multiple permanent magnets 11 in a ring array. The rotation of the impeller 8 can generate negative pressure to suck the propylene oxide material into the pump sleeve 6, and then the propylene oxide material is input into the liquid outlet 4 through the connecting pipe 13 to complete the recovery of the propylene oxide material.

[0033] By utilizing the magnetic coupling transmission of permanent magnet 1 9 and permanent magnet 2 11 between the rotating shaft 10 and the impeller 8, direct contact between the rotating shaft 10 and the impeller 8 is eliminated. Therefore, a shaft cylinder 7 is sleeved on the outer side of the rotating shaft 10, and the top of the shaft cylinder 7 is fixedly connected to the cover plate 2, so that a sealed space is formed between the shaft cylinder 7 and the cover plate 2, eliminating the safety hazard of propylene oxide material leaking through the pump seal, and effectively ensuring the physical and mental health of employees.

[0034] Since the impeller 8 will continuously output and recycle the propylene oxide material when it rotates, the propylene oxide material in the barrel bag 1 will continue to decrease. If the propylene oxide material is not replenished, the motor 5 will be idle after the propylene oxide material is recovered, resulting in a waste of electricity and an increase in the recycling cost. Figure 2 It can also be found that a liquid level alarm component 12 is provided in the barrel bag 1, which can stop the motor 5 when the propylene oxide material is insufficient, thereby effectively reducing the waste of electric energy.

[0035] In a further preferred embodiment of the present invention, Figure 3 As shown, the pump sleeve 6 is divided into a cylinder 61 and a pump body 62 from top to bottom. The connecting pipe 13 is fixedly connected to the outer wall of the cylinder 61. The diameter of the pump body 62 is larger than that of the cylinder 61, so that a pump cavity for accommodating the impeller 8 is retained between the inner wall of the pump body 62 and the shaft cylinder 7.

[0036] The bottom protrusion of the pump body 62 is formed with a liquid suction port 14 , and the outer wall of the shaft cylinder 7 is sleeved with a shaft sleeve 15 at a position inside the liquid suction port 14 , and the outer wall of the shaft sleeve 15 is fixedly connected with a plurality of spiral blades 16 .

[0037] In this embodiment, since the diameter of the impeller 8 is much larger than the shaft cylinder 7, in order to properly accommodate the impeller 8 in the pump sleeve 6, the diameter of the pump sleeve 6 needs to be enlarged. However, the direct enlargement method will increase the material required for the production of the pump sleeve 6, thereby increasing the production cost and transportation cost of the pump sleeve 6. Therefore, the observation Figure 3 It can be found that the pump sleeve 6 is divided into a cylinder 61 and a pump body 62 from top to bottom, and the diameter of the pump body 62 is larger than the diameter of the cylinder 61. A pump cavity for accommodating the impeller 8 is retained between the inner wall of the pump body 62 and the shaft cylinder 7, so that the pump sleeve 6 is expanded separately for the impeller 8 to ensure the normal operation of the impeller 8 while reducing the production and transportation costs of the pump sleeve 6, which can effectively improve the practicality of the recovery structure.

[0038] A liquid suction port 14 is formed by a protrusion at the bottom of the pump body 62, and then a shaft sleeve 15 is sleeved on the outer wall of the shaft cylinder 7 at a position inside the liquid suction port 14. A plurality of spiral blades 16 are fixedly connected to the outer wall of the shaft sleeve 15. The rotation of the shaft sleeve 15 can drive the blades 16 to rotate, thereby increasing the static pressure of the liquid suction port 14, thereby reducing the pressure when the impeller 8 absorbs the propylene oxide material, and improving the transportation efficiency of the propylene oxide material.

[0039] Since the impeller 8 is magnetically coupled with the permanent magnet 1 9 and the permanent magnet 2 11 of the rotating shaft 10, in order to make the sleeve 15 rotate, a permanent magnet 1 9 of the same specification is also installed in the sleeve 15 (not shown in the figure) to ensure that the sleeve 15 and the impeller 8 can rotate synchronously.

[0040] In a further preferred embodiment of the present invention, Figure 5 and Figure 6 As shown, the liquid level alarm assembly 12 includes a column 121, a guide rod 122, an anti-dropping block 123, a float 124 and a pressure-touch switch 125. The column 121 is fixed to the bottom of the barrel bag 1, the top of the column 121 is fixedly connected to the guide rod 122, the outer wall of the guide rod 122 is slidably connected to the float 124, the top of the guide rod 122 is fixedly connected to the anti-dropping block 123 for preventing the float 124 from dropping off, and the top of the column 121 is located on one side of the guide rod 122 and is fixedly connected to the pressure-touch switch 125.

[0041] The outer wall of the float 124 is fixedly connected to a filter screen 17 , and a side of the filter screen 17 close to the pump sleeve 6 is provided with an escape hole 18 for evading the pump sleeve 6 ;

[0042] A waterproof cover 19 is provided on the top of the pressure touch switch 125 , and the bottom of the waterproof cover 19 extends downward and is fixedly connected to the column 121 , so that a sealed space for accommodating the pressure touch switch 125 is formed between the waterproof cover 19 and the column 121 .

[0043] In this embodiment, by fixing the column 121 to the bottom of the barrel bag 1, the top of the column 121 is fixedly connected to the guide rod 122, the outer wall of the guide rod 122 is slidably connected to the float 124, the top of the guide rod 122 is fixedly connected to the anti-falling block 123 for preventing the float 124 from falling off, and the top of the column 121 is located on one side of the guide rod 122 and is fixedly connected to the pressure touch switch 125. When the propylene oxide material to be recycled is injected into the barrel bag 1, the buoyancy of the propylene oxide material is used to make the float 124 float, thereby avoiding the pressure touch switch 125 from being compressed. Subsequently, after the propylene oxide material is evacuated, the float 124 will slide down due to the loss of support until it contacts the pressure touch switch 125, thereby activating the pressure touch switch 125 and shutting down the motor 5, thereby avoiding the motor 5 idling and wasting electricity.

[0044] When the solid particle content of propylene oxide material is high, the solid particles will be recovered along with the propylene oxide material, so Figure 5 It can be found that a filter screen 17 is fixedly connected to the outer wall of the float 124, which can be used to simply filter solid particles and achieve the effect of purifying the propylene oxide material.

[0045] Since the float 124 will float up when the propylene oxide material is injected into the barrel bag 1, and there is a pump sleeve 6 in the barrel bag 1, the pump sleeve 6 will conflict with the filter screen 17 and affect the normal floating of the float 124. Therefore, an avoidance hole 18 is opened at the position of the filter screen 17 near the pump sleeve 6 to ensure the normal up and down floating of the float 124.

[0046] Since the propylene oxide material is a colorless ether-smelling liquid, when the propylene oxide material is submerged in the pressure touch switch 125, the pressure touch switch 125 will be short-circuited. Therefore, in order to protect the pressure touch switch 125, observe Figure 6 It can be found that a waterproof cover 19 is provided on the top of the pressure touch switch 125, and the bottom of the waterproof cover 19 extends downward and is fixedly connected to the column 121, so that a sealed space for accommodating the pressure touch switch 125 is formed between the waterproof cover 19 and the column 121.

[0047] The embodiments of this specific implementation method are all preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the scope of protection of the present utility model.

Claims

1. A propylene oxide recovery structure, characterized in that: The invention comprises a barrel bag (1) buried underground, wherein the top of the barrel bag (1) is fixedly connected to a cover plate (2), the top of the cover plate (2) is provided with a liquid inlet (3) and a liquid outlet (4) at intervals along a central axis, a motor (5) is installed on the top of the cover plate (2), the bottom of the cover plate (2) is located just below the motor (5) and is fixedly connected to a pump sleeve (6), a shaft cylinder (7) is provided in the middle of the pump sleeve (6), the top of the shaft cylinder (7) is fixedly connected to the cover plate (2), an infusion space for pumping liquid is reserved between the outer wall of the shaft cylinder (7) and the pump sleeve (6), and a connecting pipe (13) connected to the liquid outlet (4) is provided above the infusion space; The outer peripheral wall of the shaft cylinder (7) is connected to a plurality of impellers (8) in a rotationally spaced manner from top to bottom, the inner peripheral wall of the impeller (8) is embedded with a plurality of permanent magnets (9), a rotating shaft (10) is provided in the shaft cylinder (7), the top of the rotating shaft (10) is fixedly connected to the output shaft of the motor (5), and a plurality of permanent magnets (11) are provided in an annular array on the outer peripheral wall of the rotating shaft (10); A liquid level alarm component (12) is provided at the bottom of the tubular bag (1).

2. A propylene oxide recovery structure according to claim 1, characterized in that, The pump sleeve (6) is divided into a barrel (61) and a pump body (62) from top to bottom. The connecting pipe (13) is fixedly connected to the outer wall of the barrel (61). The diameter of the pump body (62) is larger than the diameter of the barrel (61), so that a pump cavity for accommodating the impeller (8) is retained between the inner wall of the pump body (62) and the shaft barrel (7).

3. A propylene oxide recovery structure according to claim 2, characterized in that, The bottom protrusion of the pump body (62) is formed with a liquid suction port (14), and the outer wall of the shaft cylinder (7) is located inside the liquid suction port (14) and is sleeved with a shaft sleeve (15), and the outer wall of the shaft sleeve (15) is fixedly connected with a plurality of spiral blades (16).

4. A propylene oxide recovery structure according to claim 1, characterized in that: The liquid level alarm assembly (12) comprises a column (121), a guide rod (122), an anti-dropping block (123), a float (124) and a pressure-touch switch (125). The column (121) is fixed to the bottom of the barrel bag (1). The top of the column (121) is fixedly connected to the guide rod (122). The outer wall of the guide rod (122) is slidably connected to the float (124). The top of the guide rod (122) is fixedly connected to the anti-dropping block (123) for preventing the float (124) from dropping out. The top of the column (121) is located on one side of the guide rod (122) and is fixedly connected to the pressure-touch switch (125).

5. A propylene oxide recovery structure according to claim 4, characterized in that: A filter screen (17) is fixedly connected to the outer peripheral wall of the float (124), and a side of the filter screen (17) close to the pump sleeve (6) is provided with an avoidance hole (18) for avoiding the pump sleeve (6).

6. A propylene oxide recovery structure according to claim 5, characterized in that: A waterproof sleeve (19) is provided on the top of the pressure-touch switch (125), and the bottom of the waterproof sleeve (19) extends downward and is fixedly connected to the column (121), so that a sealed space for accommodating the pressure-touch switch (125) is formed between the waterproof sleeve (19) and the column (121).

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