Square vacuum dryer with adjustable negative pressure

Abstract

The utility model relates to the technical field of vacuum dryers, in particular to a square vacuum dryer with adjustable negative pressure. Comprising a box body, a plurality of drying layers are laid in the box body, and a vacuumizing structure suitable for controlling the pressure intensity is arranged on the box body. The vacuumizing structure comprises a proportioning valve, a rotor flow meter and a filter. According to the utility model, the pressure intensity of the introduced compressed air can be controlled through the proportioning valve, and an operator can conveniently observe the change of the pressure intensity, so that the vacuumizing quality is controlled, and the drying quality is stabilized; gas instantaneous flow, accumulated flow and the like are recorded through the rotor flow meter, and an operator can conveniently observe the flow change; compressed air ready to enter is filtered through the filter, and the air quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum dryers, and particularly relates to a square vacuum dryer with adjustable negative pressure. Background Art

[0002] A square vacuum dryer is a device that dries the material to be dried under vacuum conditions. It uses a vacuum pump to evacuate air and moisture, creating a vacuum state in the drying chamber and accelerating the drying rate.

[0003] The existing Chinese patent with the publication number CN204202306U discloses a square vacuum dryer, which includes a drying box body, a drying cart located inside the drying box body, and a vacuum pumping port located at the top of the drying box body. The vacuum pumping pipeline in the vacuum pumping port at the top of the drying box body is in a T shape; a plurality of vacuum pumping ports are also provided on the side wall of the drying box body, and are connected to a vacuum pump through a vacuum pumping pipeline; a check valve tank is provided on the main road of the vacuum pumping pipeline; a sterile respirator is also provided on the side wall of the drying box body; a steam coil is also provided at the top of the drying box body; the drying cart is movable, and moving wheels are provided on its four feet; the vacuum drying effect of the utility model is better.

[0004] The above technology has the following defects: the pressure provided by the vacuum pumping pipeline for the square vacuum dryer cannot be reasonably controlled, and sometimes the pressure is insufficient, affecting the drying quality. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a square vacuum dryer with adjustable negative pressure to solve the problems existing in the prior art.

[0006] To solve the above technical problems, the utility model provides the following technical solution: a square vacuum dryer with adjustable negative pressure, which includes a box body. A plurality of drying layers are laid flat inside the box body, and a heat source delivery system is provided. A vacuum pumping structure suitable for controlling the pressure magnitude is provided on the box body.

[0007] Further, the vacuum pumping structure includes an internal vacuum pumping component and an external vacuum pumping component. The external vacuum pumping component includes a proportional regulating valve, and the proportional regulating valve is installed on the intake pipeline of the vacuum pumping structure.

[0008] Further, the vacuum pumping structure includes a rotameter, and the rotameter is installed on the intake pipeline of the external vacuum pumping component, between the proportional regulating valve and the box body.

[0009] Further, the vacuum pumping structure includes a filter, and the filter is installed on the intake pipeline of the external vacuum pumping component, on the side of the proportional regulating valve away from the box body.

[0010] Further, the internal vacuum pumping assembly includes an internal air inlet pipe and an internal air extraction pipe. The internal air inlet pipe and the internal air extraction pipe are respectively vertically installed on both sides inside the box body. A plurality of vacuum holes are provided along their respective vertical directions on the internal air inlet pipe and the internal air extraction pipe. After the internal air extraction pipe extends out of the box body, it is connected to a vacuum pump.

[0011] Further, a heat source delivery system is provided inside the box body. The heat source delivery system includes a heat source inlet pipe and a heat source distribution pipe connected in sequence. The heat source inlet pipe is located at the top of the box body. A plurality of holes are provided along the vertical direction on the heat source distribution pipe. The drying layer is hollow inside and is communicated with the holes on the heat source distribution pipe.

[0012] Further, the outer shell of the box body is provided with a sandwich layer, and a disc-shaped heating pipe is provided inside the sandwich layer.

[0013] Further, a water accumulation tray and a drain pipe are provided at the bottom of the box body.

[0014] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows: The present utility model can control the pressure of the compressed air introduced through a proportional regulating valve, and it is convenient for the operator to observe the change in pressure, thereby controlling the quality of vacuum pumping, and further stabilizing the drying quality; by using a rotameter to record the instantaneous gas flow rate, cumulative flow rate, etc., it is convenient for the operator to observe the flow rate change; by filtering the compressed air to be introduced through a filter, the air quality is stabilized, thereby stabilizing the drying quality. Description of the Drawings

[0015] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0016] Figure 1 is the overall structural schematic diagram of Embodiment 1 with a box door;

[0017] Figure 2 is the structural schematic diagram of Embodiment 1 after removing the box door.

[0018] In the figure, 1, box body; 2, box door; 3, vacuum pumping structure; 31, internal air inlet pipe; 32, internal air extraction pipe; 33, proportional regulating valve; 34, rotameter; 35, intake pipeline; 36, filter; 4, drying layer; 5, heat source inlet pipe; 6, heat source distribution pipe; 7, heating pipe; 8, interface one; 9, interface two; 10, water collecting pipe; 11, water discharge pipe; 12, water accumulation tray; 13, drain pipe; 14, ground support. Detailed Embodiments

[0019] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] Embodiment 1

[0021] As Figure 1 - Figure 2 shown, this embodiment provides a square vacuum dryer with adjustable negative pressure, which includes a box body 1 and a box door 2 hinged to the box body 1. The box door 2 can seal the box body 1. Inside the box body 1, several drying layers 4 are laid flat.

[0022] A heat source delivery system is provided inside the box body 1. The heat source delivery system includes a heat source inlet pipe 5 and a heat source distribution pipe 6 connected in sequence. The heat source inlet pipe 5 is located at the top of the box body 1, and several holes are provided in the heat source distribution pipe 6 along the vertical direction. At the bottom of each drying layer 4, a heating pipe 7 is provided. The heating pipe 7 is hollow and has holes, and the heating pipe 7 communicates with the holes on the heat source distribution pipe 6. Based on actual applications, hot steam is introduced into the heat source distribution pipe 6 through the heat source inlet pipe 5 and is distributed to the heat source distribution pipe 6 through several holes of the heat source distribution pipe 6 to dry the items in the heating layer. In order to preheat the box body and maintain the temperature inside the box body, the outer shell of the box body 1 is provided with a sandwich layer, and a disc-shaped heating pipe (not shown in the figure) is provided inside the sandwich layer.

[0023] An interface 8 for a pressure gauge and an interface 9 for a temperature detector are provided at the top of the box body 1 for monitoring the internal pressure and temperature.

[0024] One end of several heating pipes 7 is also connected to a water collecting pipe 10. The water collecting pipe 10 is vertically installed inside the box body 1. A water discharge port is provided at the bottom of the water collecting pipe 10, and a water discharge pipe 11 is installed outside the box body 1 at the water discharge port. In order to further discharge the condensed water inside the box body 1, a water collecting tray 12 is provided at the bottom of the box body 1. The water collecting tray 12 is a concave type for facilitating water collection. There is a drainage port at the concave part in the middle of the bottom, and the drainage port extends outside the box body 1 and is installed with a drainage pipe 13. Ground supports 14 are provided at the four corners of the bottom of the box body 1 for leaving space for the installation of the water discharge pipe 11 and the drainage pipe 13.

[0025] The box body 1 is provided with a vacuum pumping structure 3 suitable for controlling the pressure magnitude. The vacuum pumping structure 3 includes an internal vacuum pumping component and an external vacuum pumping component. The internal vacuum pumping component includes an internal air inlet pipe 31 and an internal air extraction pipe 32. The internal air inlet pipe 31 and the internal air extraction pipe 32 are respectively vertically installed on both sides inside the box body 1. A number of vacuum holes are provided along the respective vertical directions of the internal air inlet pipe 31 and the internal air extraction pipe 32. After the internal air extraction pipe 32 extends out of the box body 1, it is connected to a vacuum pump. The external vacuum pumping component includes a proportional regulating valve 33, a rotameter 34, and an air inlet pipe 35. The air inlet pipe 35 of the external vacuum pumping component is connected to the pipe portion where the internal air inlet pipe 31 extends out of the box body 1. The proportional regulating valve 33 and the rotameter 34 are installed on the air inlet pipe 35 of the external vacuum pumping component. Among them, the rotameter 34 is located between the proportional regulating valve 33 and the internal air inlet pipe 31. The drawn-in air can be an inert gas or fresh air. When fresh air is input, in order to ensure the quality of the fresh air, a filter 36 needs to be installed on the air inlet pipe 35 of the vacuum pumping component, and it is installed on the side of the proportional regulating valve 33 away from the internal air inlet pipe 31.

[0026] The operating principle of this embodiment is as follows: During operation, the external fresh air is sucked into the box body 1 under the negative pressure state of the box body 1. The filter 36 can filter out solid particles in the air to purify the air and improve safety. The proportional regulating valve 33 adjusts and controls the speed of the passing air to prevent the vacuum dryer from being damaged due to excessive pressure or being unable to form a negative pressure environment due to too low pressure, thereby adjusting the internal negative pressure magnitude. The rotameter 34 counts the air flow rate and the accumulated amount, providing parameter references for the user. The air enters the box body 1 through the internal air inlet pipe 31. The heating pipe 7 in the box body 1 is responsible for heating the external air. The heated air then transfers the heat to the drying layer 4 through the heating pipe 7. The hot air flow then converges into the internal air extraction pipe 32 on the other side, and the vacuum pump extracts it. The condensed water after operation is discharged through the water discharge pipe 11 and the drain pipe 13. The internal air inlet pipe 31 is used as a vent pipe to vent the internal air.

[0027] The operating principle of this embodiment is as follows: During operation, the external fresh air is sucked into the box body under the negative pressure state of the box body. The filter can filter out solid particles in the air to purify the air and improve safety. The proportional regulating valve adjusts and controls the speed of the passing air to prevent the vacuum dryer from being damaged due to excessive pressure or being unable to form a negative pressure environment due to too low pressure, thereby adjusting the internal negative pressure magnitude. The rotameter counts the air flow rate and the accumulated amount, providing parameter references for the user. The air enters the box body through the internal air inlet pipe. The heating pipe in the box body is responsible for heating the external air. The heated air then transfers the heat to the drying layer through the heating pipe. The hot air flow then converges into the internal air extraction pipe on the other side, and the vacuum pump extracts it. The condensed water after operation is discharged through the water discharge pipe and the drain pipe. The internal air inlet pipe is used as a vent pipe to vent the internal air.

[0028] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A square vacuum dryer with adjustable negative pressure, comprising a box (1), wherein a plurality of drying layers (4) are laid flat inside the box (1) and a heat source conveying system is provided, characterized in that: The box body (1) is provided with a vacuum pumping structure (3) suitable for controlling the pressure.

2. The square vacuum dryer with adjustable negative pressure according to claim 1, characterized in that: The vacuum pumping structure (3) comprises an internal vacuum pumping component and an external vacuum pumping component. The external vacuum pumping component comprises a proportional regulating valve (33). The proportional regulating valve (33) is installed on an air intake pipe (35) of the vacuum pumping structure (3).

3. The square vacuum dryer with adjustable negative pressure according to claim 2, characterized in that: The vacuum pumping structure (3) comprises a rotor flowmeter (34), wherein the rotor flowmeter (34) is installed on an air inlet pipe (35) of the external vacuum pumping component and is located between the proportional regulating valve (33) and the box (1).

4. The square vacuum dryer with adjustable negative pressure according to claim 3, characterized in that: The vacuum pumping structure (3) comprises a filter (36), wherein the filter (36) is installed on the air inlet pipe (35) of the external vacuum pumping component and is located on a side of the proportional regulating valve (33) away from the box (1).

5. The square vacuum dryer with adjustable negative pressure according to claim 4, characterized in that: The internal vacuum pumping assembly comprises an internal air intake pipe (31) and an internal air extraction pipe (32), wherein the internal air intake pipe (31) and the internal air extraction pipe (32) are respectively vertically mounted on two sides of the interior of the box body (1), and the internal air intake pipe (31) and the internal air extraction pipe (32) are provided with a plurality of vacuum holes along their respective vertical directions, and the internal air extraction pipe (32) is connected to a vacuum pump after extending out of the box body (1).

6. The square vacuum dryer with adjustable negative pressure according to claim 5, characterized in that: A heat source transport system is provided inside the box (1), and the heat source transport system comprises a heat source inlet pipe (5) and a heat source distribution pipe (6) which are connected in sequence. The heat source inlet pipe (5) is located at the top of the box (1), and a plurality of holes are provided on the heat source distribution pipe (6) in a vertical direction. The drying layer (4) is hollow inside and is connected to the holes on the heat source distribution pipe (6).

7. The square vacuum dryer with adjustable negative pressure according to claim 6, characterized in that: The outer shell of the box body (1) is provided with an interlayer, and a disc-shaped heating tube is provided in the interlayer.

8. The square vacuum dryer with adjustable negative pressure according to claim 7, characterized in that: A water collection tray (12) and a drainage pipe (13) are provided at the bottom of the box body (1).

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