Plate heat exchanger with anti-blocking function

Abstract

The plate heat exchanger with the anti-blocking function comprises a heat exchange plate set, a filter screen, a drainage branch pipe and a stop valve, the heat exchange plate set is provided with a fluid input channel, a fluid output channel and a flow channel, the fluid input channel and the fluid output channel are communicated through the flow channel, and the filter screen is installed in the fluid input channel; the output end of the fluid input channel is communicated with the input end of the fluid output channel through a drainage branch pipe; and the stop valve is arranged on the drainage branch pipe. Through cooperation of the drainage branch pipes and the stop valves, the problem that the plate heat exchanger is blocked when fluid flowing through the flow channels of the heat exchange plate set is mixed with a large number of impurities or large particles is solved, and then the situation that the maintenance cost is increased due to the fact that the plate heat exchanger needs to be frequently disassembled and cleaned due to the blocking problem in daily use and maintenance is reduced; the problems that during cleaning, the heat exchange plate is prone to being bent and deformed and cannot be used, and quick-wear parts are frequently replaced, so that cost is increased are solved.

Description

Technical Field

[0001] The invention relates to the technical field of plate heat exchangers, and more particularly to a plate heat exchanger with an anti-clogging function. Background Art

[0002] Plate heat exchangers are mainly used in the fields of petrochemical, shipbuilding, electricity, pharmaceuticals, food, heating unit supporting, etc. It is mainly composed of heat exchange plate group, compression plate, guide rod, fasteners, rear support, thermometer, pressure gauge assembly and other parts. Its working principle is: two fluids with different temperatures flow in the flow channels on both sides of the heat exchange plate in reverse or forward direction, and heat is transferred from the high-temperature fluid to the low-temperature fluid through a single heat exchange plate. Heat exchange is carried out through a heat exchange plate group composed of a series of closely arranged metal heat exchange plates. The heat exchange plate group serves as a heat exchanger. The core heat exchange unit of the heat exchanger, the corrugated structure, flow channel type and spacing of the heat exchange plate directly affect its heat exchange performance and operating resistance. From a design perspective, it is usually hoped that the turbulence degree and the spacing between the heat exchange plates when the fluid flows through the wall of the heat exchange plate are as large as possible, which helps to reduce the deposition of dirt and impurities in the narrow space of the heat exchange plate flow channel, and large particles of impurities can pass more smoothly, reducing the risk of blockage. However, blindly pursuing high turbulence and large spacing between heat exchange plates will inevitably lead to problems such as increased floor space of the plate heat exchanger, decreased heat exchange performance, and high production and manufacturing costs. Therefore, most of the current plate heat exchangers still rely on pre-filters or built-in filters in the pipeline system to prevent impurities or particles from blocking the fluid from entering the heat exchange plate group, but the filter and heat exchange plate group need to be frequently disassembled for cleaning to avoid blockage after long-term use, which not only increases the cost, but also easily causes the heat exchange plate to bend and deform and cannot be used.

[0003] Therefore, providing a plate heat exchanger with an anti-clogging function is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0004] In view of this, the present invention provides a plate heat exchanger with an anti-clogging function, which can promptly remove impurities or particles in the pipeline and reduce the blockage of the flow channel of the plate heat exchanger.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A plate heat exchanger with an anti-clogging function comprises a heat exchange plate group, wherein the heat exchange plate group has a fluid input channel, a fluid output channel and a flow channel, wherein the fluid input channel and the fluid output channel are connected through the flow channel, and further comprises a filter screen, a drainage branch pipe and a stop valve, wherein the filter screen is coated on the inner wall of the fluid input channel; the output end of the fluid input channel is connected to the input end of the fluid output channel through the drainage branch pipe; and the stop valve is installed on the drainage branch pipe.

[0007] By adopting the above technical solution, the beneficial effects of the present invention are:

[0008] The present invention solves the problem of blockage of the plate heat exchanger when a large amount of impurities or large particles are contained in the fluid flowing through the flow channel of the heat exchange plate group through the cooperation of the drainage branch pipe and the stop valve, thereby reducing the need to frequently disassemble and clean the plate due to blockage during daily use and maintenance, which leads to increased maintenance costs, and solves the problems of bending and deformation of the heat exchange plate and inability to use it during cleaning, and frequent replacement of wearing parts, which increases costs.

[0009] Furthermore, the flow rate of the fluid in the drainage branch pipe is at least 1.5-2 times the flow rate of the fluid in the flow channel.

[0010] The beneficial effect of adopting the above-mentioned further technical solution is that a large amount of impurities or large particles deposited in the fluid input channel under high flow rate conditions can be easily washed away, thereby avoiding a large amount of impurities or large particles deposited in the fluid input channel for a long time blocking the fluid from entering the flow channel of the heat exchange plate group to participate in heat exchange, thereby increasing the operating resistance of the piping system.

[0011] Furthermore, it also includes a first pressure sensor, a second pressure sensor and a controller, and the stop valve is an electric stop valve; the first pressure sensor is installed at the input end of the fluid input channel; the second pressure sensor is installed at the output end of the fluid output channel; the first pressure sensor and the second pressure sensor are electrically connected to the controller respectively, and the controller is electrically connected to the electric stop valve.

[0012] The beneficial effect of adopting the above further technical solution is that the first pressure sensor and the second pressure sensor realize the inlet and outlet pressure difference data feedback and then control the opening and closing of the electric stop valve, thereby realizing unmanned automatic operation.

[0013] Furthermore, the fluid input channel and the fluid output channel are distributed vertically.

[0014] The beneficial effects of adopting the above-mentioned further technical solution are as follows: on the one hand, it can facilitate the impurities or particulate matter that pass through the filter and enter the flow channel of the heat exchange plate group to pass more easily due to their own gravity and the flow velocity between the heat exchange plates; on the other hand, it is beneficial for the impurities or particulate matter that are filtered and intercepted by the filter and deposited in its fluid input channel to be flushed to the fluid output channel through the drainage branch pipe under the action of high flow rate and return to the outlet pipeline system.

[0015] Furthermore, it also includes a fixed clamping plate, a movable clamping plate, a plurality of clamping studs and a frame, wherein the fixed clamping plate, the heat exchange plate group and the movable clamping plate are distributed in sequence from front to back and are connected together through a plurality of the clamping studs; the heat exchange plate group is installed on the frame; and both ends of the drainage branch pipe respectively pass through the movable clamping plate and are connected to the output end of the fluid input channel and the input end of the fluid output channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0017] Figure 1 The accompanying drawing is a cross-sectional view of a plate heat exchanger with anti-clogging function provided by the present invention;

[0018] Figure 2 The accompanying drawing is a side view of a plate heat exchanger with anti-clogging function provided by the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1-2 As shown, the embodiment of the present invention discloses a plate heat exchanger with anti-blocking function, including a heat exchange plate group 1, a filter 2, a drainage branch pipe 3 and a stop valve 4. The heat exchange plate group 1 has a fluid input channel 11, a fluid output channel 12 and a flow channel. The fluid input channel 11 and the fluid output channel 12 are connected through the flow channel, and the filter 2 is coated on the inner wall of the fluid input channel 11; the output end of the fluid input channel 11 is connected to the input end of the fluid output channel 12 through the drainage branch pipe 3; and the stop valve 4 is installed on the drainage branch pipe 3. The present invention solves the blockage problem of the plate heat exchanger when a large amount of impurities or large particles are mixed in the fluid flowing through the flow channel of the heat exchange plate group 1 through the cooperation of the drainage branch pipe 3 and the stop valve 4, thereby reducing the need to frequently disassemble and clean it due to the blockage problem in daily use and maintenance, resulting in increased maintenance costs, and solves the problems of bending and deformation of the heat exchange plate that is easy to cause unusability during cleaning and frequent replacement of wearing parts that increase costs.

[0021] Specifically, the fluid flow rate in the drainage branch pipe 3 is at least 1.5-2 times the fluid flow rate in the flow channel. The flow rate in the flow channel is the flow rate in the flow channel between the heat exchange plates obtained in the thermal simulation calculation. The flow rate ratio between the two can be achieved by selecting the ratio of the diameter of the drainage branch pipe 3 and the diameter of the flow channel. In this way, a large amount of impurities or large particles deposited in the fluid input channel under high flow rate conditions can be easily washed away, avoiding a large amount of impurities or large particles deposited in the fluid input channel for a long time. The flow channel blocks the fluid from entering the heat exchange plate group flow channel to participate in heat exchange, thereby increasing the operating resistance of the pipeline system.

[0022] In order to further optimize the technical solution of the present invention, it also includes a first pressure sensor, a second pressure sensor and a controller, and the stop valve 4 is an electric stop valve; the first pressure sensor is installed at the input end of the fluid input channel 11; the second pressure sensor is installed at the output end of the fluid output channel 12; the first pressure sensor and the second pressure sensor are electrically connected to the controller respectively, and the controller is electrically connected to the electric stop valve. The first pressure sensor and the second pressure sensor realize the inlet and outlet pressure difference data feedback and then control the opening and closing of the electric stop valve, thereby realizing unmanned automatic operation.

[0023] In order to further optimize the technical solution of the present invention, the fluid input channel 11 and the fluid output channel 12 are distributed up and down. This can, on the one hand, facilitate the impurities or particulate matter that pass through the filter screen 2 and enter the flow channel of the heat exchange plate group 1 to pass more easily under the action of their own gravity and the flow velocity between the heat exchange plates; on the other hand, it is beneficial for the impurities or particulate matter that are filtered and intercepted by the filter screen 2 and deposited in the fluid input channel 11 to be flushed to the fluid output channel 12 through the drainage branch pipe 3 under the action of high flow rate and return to the outlet pipeline system.

[0024] Specifically, it also includes a fixed clamping plate 5, a movable clamping plate 6, a plurality of clamping studs 7 and a frame 8. The fixed clamping plate 5, the heat exchange plate group 1 and the movable clamping plate 6 are distributed in sequence from front to back and are connected together through a plurality of clamping studs 7; the heat exchange plate group 1 is installed on the frame 8. Of course, the frame 8 includes a guide rod and a rear support to support the heat exchange plate group 1. This is the prior art and will not be repeated here; the two ends of the drainage branch pipe 3 respectively pass through the movable clamping plate 6 and are connected to the output end of the fluid input channel 11 and the input end of the fluid output channel 12.

[0025] The working principle of the present invention is as follows:

[0026] When the pressure difference between the fluid input channel 11 containing the filter screen 2 and the fluid output channel 12 exceeds the design allowable value, the stop valve 4 on the drainage branch pipe 3 can be opened. At this time, the high-velocity fluid flowing through the drainage branch pipe 3 can be used to flush a large amount of impurities or large particles deposited inside the fluid input channel 11 to the fluid output channel 12 and return them to the return pipe system. When the pressure difference between the fluid input channel 11 and the fluid output channel 12 is lower than the design allowable value, the stop valve 4 on the drainage branch pipe 3 can be closed.

[0027] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0028] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A plate heat exchanger with anti-clogging function, comprising a heat exchange plate group, wherein the heat exchange plate group has a fluid input channel, a fluid output channel and a flow channel, wherein the fluid input channel and the fluid output channel are connected through the flow channel, characterized in that: It also includes a filter screen, a drainage branch pipe and a stop valve, wherein the filter screen is coated on the inner wall of the fluid input channel; the output end of the fluid input channel is connected to the input end of the fluid output channel through the drainage branch pipe; and the stop valve is installed on the drainage branch pipe.

2. A plate heat exchanger with anti-clogging function according to claim 1, characterized in that: The flow rate of the fluid in the drainage branch pipe is at least 1.5-2 times the flow rate of the fluid in the flow channel.

3. A plate heat exchanger with anti-clogging function according to claim 1 or 2, characterized in that: It also includes a first pressure sensor, a second pressure sensor and a controller, and the stop valve is an electric stop valve; the first pressure sensor is installed at the input end of the fluid input channel; the second pressure sensor is installed at the output end of the fluid output channel; the first pressure sensor and the second pressure sensor are electrically connected to the controller respectively, and the controller is electrically connected to the electric stop valve.

4. The plate heat exchanger with anti-clogging function according to claim 1, characterized in that: The fluid input channel and the fluid output channel are distributed up and down.

5. The plate heat exchanger with anti-clogging function according to claim 1, characterized in that: It also includes a fixed clamping plate, a movable clamping plate, a plurality of clamping studs and a frame, wherein the fixed clamping plate, the heat exchange plate group and the movable clamping plate are distributed in sequence from front to back and are connected together through a plurality of the clamping studs; the heat exchange plate group is installed on the frame; the two ends of the drainage branch pipe respectively pass through the movable clamping plate and are connected to the output end of the fluid input channel and the input end of the fluid output channel.

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