Evaporator for producing formaldehyde

Abstract

The invention relates to the technical field of evaporators, and discloses an evaporator for producing formaldehyde, the evaporator comprises a tank body, an adjusting assembly is arranged in the middle of the bottom end of the tank body, the adjusting assembly comprises a support fixedly mounted at the bottom end of the tank body, and a linear motor is fixedly mounted at the bottom of the inner wall of the support; a linkage shaft sleeve is in transmission connection with an output shaft of the linear motor, a connecting rod is movably sleeved with the linkage shaft sleeve, a buoyancy ball is fixedly installed at the top end of the connecting rod, and an elastic piece is movably sleeved with the bottom of the outer surface of the connecting rod. According to the evaporator for producing the formaldehyde, the adjusting assembly and the buoyancy ball on the adjusting assembly are arranged, and when the liquid level of the formaldehyde in the tank body is lowered due to evaporation and concentration operation, the buoyancy ball moves downwards to a corresponding degree under the elastic force action of the elastic piece so as to increase the water discharge amount of the buoyancy ball; furthermore, the liquid level height of the formaldehyde in the tank body is increased and kept at the corresponding height, and the stability of the temperature and the pressure in the evaporator is effectively kept.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of evaporators, in particular to an evaporator for producing formaldehyde. BACKGROUND

[0002] An evaporator is a device that converts liquid matter into gas, and has a large number of applications in industrial production and life. In the production of formaldehyde, the raw material needs to be concentrated by an evaporator to meet the concentration requirements of the subsequent production process. In the process of concentrating formaldehyde by an evaporator, the liquid level of the formaldehyde solution in the evaporator is strictly required. If the liquid level of the formaldehyde is too low, the evaporation area will be reduced, and if the liquid level is too high, the resistance of the system will be increased. The existing evaporators for producing formaldehyde mostly use the method of pumping liquid to adjust the height of the liquid level. However, this method is prone to cause violent fluctuations in the temperature and pressure inside the evaporator due to the temperature difference of the formaldehyde solution, which seriously affects the concentration efficiency of the formaldehyde solution and poses a great safety hazard, and the safety and reliability are low.

[0003] Therefore, there is an urgent need for an evaporator liquid level adjusting mechanism for producing formaldehyde to solve the above-mentioned problems of the existing evaporators in actual use. SUMMARY

[0004] The present application provides an evaporator for producing formaldehyde, which can adjust the liquid level of formaldehyde without pumping the solution, effectively maintaining the stability of the temperature and pressure in the evaporator, and has the advantage of high concentration efficiency of the formaldehyde solution, to solve the problem that the method of pumping liquid to adjust the height of the liquid level is prone to cause violent fluctuations in the temperature and pressure inside the evaporator, which seriously affects the concentration efficiency of the formaldehyde solution and poses a great safety hazard.

[0005] To achieve the above object, the application adopts the following technical scheme: an evaporator for producing formaldehyde, comprising a tank body for evaporating and concentrating formaldehyde solution, a liquid inlet pipe opening for conveying formaldehyde solution being arranged in the middle of one side of the outer surface of the tank body and communicated with the inner cavity of the tank body, a pressure relief valve being fixedly installed on one side of the top end of the tank body and communicated with the inner cavity of the tank body, a liquid outlet pipe opening for discharging concentrated formaldehyde solution being arranged at the bottom of one side of the outer surface of the tank body and communicated with the inner cavity of the tank body, an adjusting assembly being arranged in the middle of the bottom end of the tank body, the adjusting assembly comprising a bracket fixedly installed on the bottom end of the tank body, a linear motor being fixedly installed at the bottom of the inner wall of the bracket, a linkage shaft sleeve being drivingly connected to the output shaft of the linear motor, and the linkage shaft sleeve being moved upward or downward under the driving action of the linear motor, a connecting rod being movably sleeved in the linkage shaft sleeve and extending into the inner cavity of the tank body, a buoyancy ball being fixedly installed at the top end of the connecting rod and capable of floating on the liquid level of formaldehyde, and an elastic member being movably sleeved at the bottom of the outer surface of the connecting rod and drivingly connecting the connecting rod and the linkage shaft sleeve.

[0006] At the initial stage, the buoyancy of the buoyancy ball and the elastic force of the elastic member are kept in balance, when the liquid level of formaldehyde in the tank body is lowered due to the evaporation and concentration operation, the buoyancy ball is moved downward by a corresponding degree under the elastic force of the elastic member, and the linear motor is triggered to drive the linkage shaft sleeve to move downward, and the connecting rod and the buoyancy ball thereon are forced to move downward to increase the displacement of the buoyancy ball under the elastic force of the elastic member, so that the liquid level of formaldehyde in the tank body is raised and kept at a corresponding height.

[0007] Further, the bottom of the outer surface of the connecting rod is provided with a first contact ring, the middle of the inner wall of the linkage shaft sleeve is provided with a second contact ring above the first contact ring, and the first contact ring and the second contact ring are unidirectionally connected in feedback, when the first contact ring is moved downward and relatively displaced with the second contact ring, the linear motor is triggered to drive the linkage shaft sleeve to move downward, and the connecting rod and the buoyancy ball thereon are forced to move downward to increase the displacement of the buoyancy ball under the elastic force of the elastic member, so that the liquid level of formaldehyde in the tank body is raised.

[0008] Further, a pressure sensor is arranged between the linkage shaft sleeve and the linear motor, and the pressure sensor and the linear motor are electrically connected in feedback, so that the displacement of the connecting rod and the buoyancy ball thereon moving downward (i.e. the displacement of the buoyancy ball) driven by the linear motor can be adjusted according to the pressure sensor to ensure the height of the liquid level of formaldehyde in the tank body.

[0009] Further, the tank body is internally provided with a plurality of air flow pipes arranged in an annular array, and the bottom end of the air flow pipe extends below the liquid level of the formaldehyde solution in the tank body, the bottom end of the air flow pipe is sealed, and meanwhile, a middle portion of the other side of the outer surface of the tank body is provided with an air inlet pipeline connected with the air flow pipe, and the other end of the air inlet pipeline is connected with the heat pump and forms a flow circulation loop, so that hot air flow can be delivered to the formaldehyde solution in the tank body through the air flow pipe, the hot air flow heats the air flow pipe 5 and transfers heat to the formaldehyde solution in the tank body 1 to evaporate and concentrate the formaldehyde solution, and meanwhile, a steam outlet connected to the inner cavity of the tank body is arranged on one side of the top end of the tank body for discharging steam, and a pressure relief valve is arranged to ensure the stability of the pressure in the inner cavity of the tank body.

[0010] Further, one side of the outer surface of the linkage shaft sleeve is provided with an induction strip arranged along the axis thereof, and an induction device in contact with the induction strip is fixedly installed on one side of the linear motor, and the induction device and the heat pump are connected in feedback, so that the temperature of the hot air flow delivered by the heat pump can be automatically adjusted according to the amount of formaldehyde solution in the tank body, so that the temperature of the formaldehyde solution in the tank body is kept within a predetermined range, and the temperature of the formaldehyde solution will not continuously rise due to evaporation and concentration.

[0011] Further, the initial height of the liquid level of the formaldehyde solution delivered by the liquid inlet pipe into the tank body is not higher than the center of the buoyancy ball, so as to provide corresponding volume support for the downward movement of the buoyancy ball and the increase of the displacement to raise the liquid level of the formaldehyde solution in the tank body.

[0012] Further, the buoyancy ball is a hollow spherical structure, and a through hole structure is formed in the inner part of the connecting rod and is connected with the buoyancy ball, so as to ensure that the buoyancy ball does not easily expand and contract with a large degree during the process of temperature rise of the formaldehyde solution, so as to effectively improve the stability and reliability of the evaporator during operation.

[0013] The present application has the following advantages:

[0014] The evaporator for producing formaldehyde provided by the present application adjusts the assembly and the buoyancy ball arranged thereon, when the liquid level of formaldehyde in the tank body decreases due to evaporation and concentration operation, the buoyancy ball moves downward by a corresponding degree under the elastic force of the elastic member, and triggers the linear motor to drive the linkage shaft sleeve to move downward, and the connecting rod and the buoyancy ball thereon are forced to move downward under the elastic force of the elastic member to increase the displacement of the buoyancy ball, so as to raise the liquid level of formaldehyde in the tank body and keep it at a corresponding height, relative to the existing technical means, the liquid level of formaldehyde can be adjusted without pumping the solution, the stability of the temperature and pressure in the evaporator is effectively maintained, and the evaporation and concentration efficiency of the formaldehyde solution is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a front view of the structure of the present invention;

[0018] Figure 3 This is a top view of the structure of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of the adjustment component of the present invention;

[0020] Figure 5 The structure of this invention Figure 4 Enlarged diagram of point A in the middle.

[0021] In the diagram: 1-Tank body, 2-Liquid inlet, 3-Steam outlet, 4-Pressure relief valve, 5-Air flow pipe, 6-Air inlet pipe, 7-Liquid outlet, 8-Buoyancy ball, 9-Adjusting component, 10-Bracket, 11-Linear motor, 12-Linkage bushing, 13-Connecting rod, 14-Elastic element, 15-First contact ring, 16-Second contact ring, 17-Sensing strip, 18-Sensing device. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figure 1 , Figure 2 As shown, an evaporator for producing formaldehyde includes a tank 1 for evaporating and concentrating a formaldehyde solution. An inlet 2 for conveying the formaldehyde solution is located at the center of one side of the outer surface of the tank 1, connecting to its inner cavity. A pressure relief valve 4, connecting to its inner cavity, is fixedly installed on one side of the top of the tank 1. A drain 7, connecting to its inner cavity, is located at the bottom of one side of the outer surface of the tank 1, discharging the concentrated formaldehyde solution. An adjustment component 9 is located at the center of the bottom of the tank 1. Figure 4As shown, the adjusting assembly 9 comprises a bracket 10 fixedly installed at the bottom end of the tank body 1, a linear motor 11 fixedly installed at the bottom of the inner wall of the bracket 10, a linkage shaft sleeve 12 drivingly connected to the output shaft of the linear motor 11, and a connecting rod 13 movably sleeved in the linkage shaft sleeve 12 and extending into the inner cavity of the tank body 1, and a buoyancy ball 8 fixedly installed at the top end of the connecting rod 13 and capable of floating on the liquid level of formaldehyde, and a resilient member 14 movably sleeved at the bottom of the outer surface of the connecting rod 13 and drivingly connecting the connecting rod 13 and the linkage shaft sleeve 12.

[0024] At the initial stage, the buoyancy of the buoyancy ball 8 and the elastic force of the resilient member 14 are balanced, and when the liquid level of formaldehyde in the tank body 1 is lowered due to evaporation and concentration operation, the buoyancy ball 8 moves downward by a corresponding degree under the elastic force of the resilient member 14, triggers the linear motor 11 to drive the linkage shaft sleeve 12 to move downward, and the connecting rod 13 and the buoyancy ball 8 thereon are forced to move downward to increase the displacement of the buoyancy ball 8 under the elastic force of the resilient member 14, so that the liquid level of formaldehyde in the tank body 1 is raised and maintained at a corresponding height.

[0025] As shown in Figure 1 , Figure 4 In the technical solution, the bottom of the outer surface of the connecting rod 13 is provided with a first contact ring 15, the middle of the inner wall of the linkage shaft sleeve 12 is provided with a second contact ring 16 above the first contact ring 15, and the first contact ring 15 and the second contact ring 16 are unidirectionally connected, and when the first contact ring 15 moves downward and relatively displaces with the second contact ring 16, the linear motor 11 is triggered to drive the linkage shaft sleeve 12 to move downward, and the connecting rod 13 and the buoyancy ball 8 thereon are forced to move downward to increase the displacement of the buoyancy ball 8 under the elastic force of the resilient member 14, so that the liquid level of formaldehyde in the tank body 1 is raised.

[0026] In the technical solution, a pressure sensor is arranged between the linkage shaft sleeve 12 and the linear motor 11, and the pressure sensor and the linear motor 11 are electrically connected, so that the displacement of the connecting rod 13 and the buoyancy ball 8 thereon driven by the linear motor 11 (i.e. the displacement of the buoyancy ball 8) can be adjusted according to the pressure sensor to ensure the height of the liquid level of formaldehyde in the tank body 1.

[0027] As shown in Figure 2 , Figure 4As shown in the technical scheme, the inside of the tank body 1 is provided with a plurality of air flow pipes 5 arranged in an annular array, the bottom end of the air flow pipe 5 extends below the liquid level of the formaldehyde solution in the tank body 1, the bottom end of the air flow pipe 5 is sealed, and a gas inlet pipeline 6 is arranged on the other side of the middle of the outer surface of the tank body 1 and is in communication with the air flow pipe 5, the other end of the gas inlet pipeline 6 is in communication with the heat pump and forms a flow circulation loop, so that hot air flow can be delivered to the formaldehyde solution in the tank body 1 through the air flow pipe 5, the air flow pipe 5 is heated by the hot air flow and the heat is transferred to the formaldehyde solution in the tank body 1 to evaporate and concentrate the formaldehyde solution, and a steam outlet 3 is arranged on one side of the top end of the tank body 1 and is in communication with the inner cavity of the tank body 1 for discharging steam, and cooperates with the pressure relief valve 4 to ensure the stability of the pressure in the inner cavity of the tank body 1.

[0028] As shown in the technical scheme, Figure 4 , Figure 5 In the technical scheme, the outer surface of the linkage shaft sleeve 12 is provided with an induction strip 17 arranged along the axis thereof, and an induction device 18 is fixedly installed on one side of the top end of the linear motor 11 and is in contact with the induction strip 17, and the induction device 18 is in feedback connection with the heat pump, so that the temperature of the hot air flow delivered by the heat pump can be automatically controlled according to the amount of the formaldehyde solution in the tank body 1, so that the temperature of the formaldehyde solution in the tank body 1 is within the preset range, and the temperature of the formaldehyde solution will not continuously rise due to evaporation and concentration.

[0029] In the technical scheme, the initial height of the liquid level of the formaldehyde solution delivered by the liquid inlet pipe 2 into the tank body 1 is not higher than the center of the buoyancy ball 8, so as to provide corresponding volume support for the downward movement of the buoyancy ball 8 and the increase of the displacement to raise the liquid level height of the formaldehyde solution in the tank body 1.

[0030] As shown in the technical scheme, Figure 1 , Figure 4 In the technical scheme, the buoyancy ball 8 is provided in a hollow spherical structure, and a through hole structure is formed in the inside of the connecting rod 13 and is in communication with the buoyancy ball 8, so as to ensure that the buoyancy ball 8 is not prone to large thermal expansion and contraction changes during the process of temperature rise of the formaldehyde solution, so as to effectively improve the stability and reliability of the evaporator during operation.

[0031] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An evaporator for producing formaldehyde, comprising a tank body (1), a middle part of one side of the outer surface of the tank body (1) is provided with a liquid inlet (2) communicated to the inner cavity of the tank body (1), and a pressure relief valve (4) communicated to the inner cavity of the tank body (1) is fixedly installed on one side of the top end of the tank body (1), and a bottom part of one side of the outer surface of the tank body (1) is provided with a liquid outlet (7) communicated to the inner cavity of the tank body (1), characterized in that: a middle part of the bottom end of the tank body (1) is provided with an adjusting assembly (9), the adjusting assembly (9) comprises a bracket (10) fixedly installed on the bottom end of the tank body (1), a linear motor (11) is fixedly installed on the bottom part of the inner wall of the bracket (10), a linkage shaft sleeve (12) is drivingly connected to the output shaft of the linear motor (11), a connecting rod (13) extending into the inner cavity of the tank body (1) is movably sleeved in the linkage shaft sleeve (12), a buoyancy ball (8) is fixedly installed on the top end of the connecting rod (13), and an elastic member (14) is movably sleeved on the bottom part of the outer surface of the connecting rod (13), and the elastic member (14) drivingly connects the connecting rod (13) and the linkage shaft sleeve (12).

2. The evaporator for producing formaldehyde according to claim 1, characterized by, A first contact ring (15) is arranged on the bottom part of the outer surface of the connecting rod (13), a second contact ring (16) is arranged on the middle part of the inner wall of the linkage shaft sleeve (12) and above the first contact ring (15), and the first contact ring (15) and the second contact ring (16) are unidirectionally connected in feedback.

3. The evaporator for producing formaldehyde according to claim 2, characterized by, A pressure sensor is arranged between the linkage shaft sleeve (12) and the linear motor (11), and the pressure sensor and the linear motor (11) are electrically connected in feedback.

4. The evaporator for producing formaldehyde according to claim 1, wherein An airflow pipe (5) is arranged in the tank body (1), the bottom end of the airflow pipe (5) is sealingly designed, a gas inlet pipeline (6) is arranged on the other side of the middle part of the outer surface of the tank body (1) and communicated with the airflow pipe (5), the other end of the gas inlet pipeline (6) is communicated with a heat pump, and a steam outlet (3) is arranged on one side of the top end of the tank body (1) and communicated with the inner cavity of the tank body (1).

5. The evaporator for producing formaldehyde according to claim 4, wherein An induction strip (17) is arranged on one side of the outer surface of the linkage shaft sleeve (12) along the central axis, an induction device (18) is fixedly installed on one side of the top end of the linear motor (11) and in contact with the induction strip (17), and the induction device (18) and the heat pump are connected in feedback.

6. The evaporator for producing formaldehyde according to claim 1, wherein The initial height of the liquid level of the formaldehyde solution delivered into the tank body (1) through the liquid inlet (2) is not higher than the center of the buoyancy ball (8), thereby providing corresponding volume support for the downward movement of the buoyancy ball (8) and the increase of the drainage capacity to increase the liquid level of the formaldehyde solution in the tank body (1).

7. The evaporator for producing formaldehyde according to claim 1, wherein The buoyancy ball (8) is a hollow spherical structure, and a through hole structure is arranged in the connecting rod (13) and communicated with the buoyancy ball (8).

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