Energy-saving plate heat exchanger with high heat exchange efficiency

Abstract

This invention discloses an energy-saving plate heat exchanger with high efficiency, relating to the field of heat exchanger technology. It includes a first and second pressure plate, with several heat exchange plates installed between them, forming a hot medium channel and a cold medium channel. The invention utilizes the expansion of paraffin wax within an immersion heat-conducting shroud, which expands in volume due to the increased temperature of the terminal outlet water. This expansion pushes a trigger rod outwards, converting the displacement of the trigger rod into a linear thrust on the hot-end adjusting rod. This, in turn, drives the adjusting piston to slide within the hot medium inlet pipe, gradually blocking the originally open outlet hole. This achieves a closed-loop feedback control effect, reversing the flow of heat source replenishment based on the cold-end outlet temperature. This overcomes the shortcomings of existing technologies, such as significant thermal hysteresis, slow response speed, and complex external piping connections that not only occupy a large space but also significantly increase the risk of fluid leakage, making it difficult to meet the requirements of efficient, compact, and sensitive automatic temperature control in environments without electricity.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and in particular to an energy-saving plate heat exchanger with high efficiency. Background Technology

[0002] Plate heat exchangers are a new type of high-efficiency heat exchange equipment composed of a series of metal plates with a certain corrugated shape. The various plates are connected by sealing gaskets to form thin rectangular channels. Hot and cold fluids flow in the channels on both sides of the plates, and heat is transferred through the metal plates. It mainly consists of heat transfer plates, sealing gaskets, end clamping plates, fixed plates and movable plates, clamping bolts, brackets and other components, and is widely used in chemical, food, pharmaceutical and other technical fields.

[0003] Existing plate heat exchangers mainly use stacked corrugated metal plates to form channels for alternating hot and cold fluids. During operation, high-temperature and low-temperature media enter their respective channels and convection occurs on both sides of the plates. Heat is conducted from the hot side to the cold side through the metal plate walls, thus achieving heat exchange between the media. However, most existing plate heat exchangers are passive heat exchange devices and lack the ability to adaptively adjust the output temperature. When the heat source temperature fluctuates drastically, they cannot automatically adjust the cold source supply, resulting in fluctuating outlet water temperature and extremely poor stability. In addition, traditional external temperature control solutions usually use wall-mounted temperature sensing, which has a significant thermal hysteresis effect and slow response speed. Moreover, the complex external connection piping not only occupies a lot of space but also significantly increases the risk of fluid leakage, making it difficult to meet the requirements of efficient, compact, and sensitive automatic temperature control in an environment without electricity. Summary of the Invention

[0004] The purpose of this invention is to: expand the paraffin wax inside the immersion heat-conducting cover as the terminal outlet water temperature rises, pushing the trigger rod outward. Through the lever mechanism formed by the connecting shaft and the balance rod, the displacement of the trigger rod is converted into a linear thrust on the hot end adjustment rod, which in turn drives the adjustment piston to slide in the hot medium inlet pipe and compress the adjustment spring, gradually blocking the originally open discharge hole. This achieves a closed-loop feedback control effect of directly throttling the heat source supply channel in reverse according to the cold end discharge temperature using mechanical transmission. This overcomes the significant thermal hysteresis effect, slow response speed, and complex external pipeline connections in existing technologies, which not only occupy a lot of space but also significantly increase the risk of fluid leakage, making it difficult to meet the requirements of efficient, compact, and sensitive automatic temperature control in an electricity-free environment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an energy-saving plate heat exchanger with high efficiency heat exchange, comprising a first pressing plate and a second pressing plate, wherein a plurality of heat exchange plates are installed between the first pressing plate and the second pressing plate, and a hot medium channel and a cold medium channel are formed between the heat exchange plates; the first pressing plate is provided with a hot medium inlet pipe and a hot medium outlet pipe communicating with the hot medium channel, and a cold medium inlet pipe and a cold medium outlet pipe communicating with the cold medium channel; an immersion heat-conducting cover is provided at the end of the cold medium outlet pipe; a paraffin wax loading sleeve is installed on one side surface of the immersion heat-conducting cover facing the inside of the cold medium outlet pipe; the inner wall of the paraffin wax loading sleeve is filled with expanded paraffin wax; a sealing diaphragm is slidably installed on the inner wall of the paraffin wax loading sleeve; a trigger rod is connected to one side surface of the sealing diaphragm; and an adjustment component is installed inside the immersion heat-conducting cover. The heat medium inlet pipe has a discharge hole on its peripheral wall. An adjusting piston is slidably installed on the inner wall of the heat medium inlet pipe. An adjusting rod is connected to the inner wall of the adjusting piston. An adjusting spring is installed on the inner wall of the adjusting piston. A transmission assembly is connected between the adjusting rod and the trigger rod.

[0006] Furthermore, the invasive heat-conducting cover is made of copper and has a semi-circular structure extending into the interior of the cold medium discharge pipe. The discharge holes are arranged in a ring array and are equidistantly distributed on the peripheral wall of the hot medium inlet pipe. The adjusting rod extends from the interior of the hot medium inlet pipe to its exterior. One end of the trigger rod extends from the interior of the invasive heat-conducting cover to its outer surface. One end of the adjusting spring is in contact with one side of the inner wall of the adjusting piston, and the other end of the adjusting piston is in contact with one side of the inner wall of the hot medium inlet pipe.

[0007] Furthermore, the adjustment assembly includes a contact ring disposed on the outer surface of the trigger rod, a limit ring fixedly installed on the outer surface of the paraffin loading sleeve, a return spring installed on the inner wall of the limit ring, a clamping screw installed on one side surface of the first clamping plate, and a fixing bolt threadedly installed on the outer surface of the clamping screw.

[0008] Furthermore, the clamping screws are a plurality of screws arranged in a linear array on one side and the other side of the first clamping plate, and each clamping screw has a corresponding fixing bolt distributed on its outer side surface. The second clamping plate and the heat exchange plate are in contact with each other.

[0009] Furthermore, the bottom surface of the reset spring is in contact with the top surface of the contact ring, and the top surface of the reset spring is in contact with the top surface of the inner wall of the limiting ring. The reset spring is used to push the trigger rod to reset via the contact ring.

[0010] Furthermore, the transmission assembly includes a connecting block, which is installed on one side surface of the heat medium inlet pipe. A rotating shaft is rotatably mounted on the inner wall of the connecting block, a balance bar is mounted on the outer surface of the rotating shaft, a displacement groove is mounted on one side surface of the balance bar, and a connecting shaft is slidably mounted on the inner wall of the displacement groove.

[0011] Furthermore, one side surface of the connecting block is fixedly connected to one side surface of the cold medium discharge pipe. There are two displacement grooves, which are equidistantly distributed on one side surface of the balance bar. Connecting shafts are correspondingly distributed on the inner walls of the two displacement grooves. One connecting shaft is fixedly connected to one end of the adjusting rod, and the other connecting shaft is fixedly connected to one end of the trigger rod. The balance bar is rotatably connected to the connecting block through a rotating shaft.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: This energy-efficient plate heat exchanger utilizes the expansion of paraffin wax within an immersion heat-conducting shroud as the terminal outlet water temperature rises. This expansion pushes a trigger rod outward, and a lever mechanism consisting of a connecting shaft and a balance rod converts the trigger rod's displacement into a linear thrust on the hot-end adjusting rod. This, in turn, drives the adjusting piston to slide within the hot medium inlet pipe and compress the adjusting spring, gradually blocking the originally open outlet. This achieves a closed-loop feedback control effect, directly throttling the heat source supply channel based on the cold-end outlet temperature using mechanical transmission. This overcomes the significant thermal hysteresis, slow response speed, and complex external piping connections of existing technologies, which not only occupy a large space but also significantly increase the risk of fluid leakage, making it difficult to meet the requirements for efficient, compact, and sensitive automatic temperature control in environments without electricity. Attached Figure Description

[0013] Figure 1 A schematic diagram of the overall external structure of the present invention is shown; Figure 2 This invention is shown as a schematic diagram of its overall external structure from another angle. Figure 3 A schematic diagram of the heat exchange plate structure of the present invention is shown; Figure 4 A schematic diagram of the heat exchange plate of the present invention from another angle is shown; Figure 5 A schematic diagram of the top structure of the heat medium inlet pipe of the present invention is shown; Figure 6 A schematic diagram of the internal structure of the heat medium inlet pipe of the present invention is shown; Figure 7 A schematic diagram of the cold medium discharge pipe structure of the present invention is shown; Figure 8 A schematic diagram of the internal structure of the invasive heat-conducting shield of the present invention is shown.

[0014] Legend: 1. First clamping plate; 101. Second clamping plate; 102. Heat exchange plate; 103. Hot medium channel; 104. Cold medium channel; 3. Hot medium inlet pipe; 105. Hot medium outlet pipe; 106. Cold medium inlet pipe; 2. Cold medium outlet pipe; 201. Heat-conducting cover; 202. Paraffin wax loading sleeve; 203. Expanded paraffin wax; 204. Sealing diaphragm; 205. Trigger rod; 301. Discharge hole; 302. Adjusting piston; 303. Adjusting rod; 304. Adjusting spring; 206. Contact ring; 207. Limiting ring; 208. Return spring; 107. Clamping screw; 108. Fixing bolt; 4. Connecting block; 401. Rotating shaft; 402. Balance bar; 403. Displacement groove; 404. Connecting shaft. Detailed Implementation

[0015] 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.

[0016] It should be noted that, in the description of this invention, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0017] like Figures 1-8As shown, an energy-saving plate heat exchanger with high efficiency includes a first pressure plate 1 and a second pressure plate 101. A plurality of heat exchange plates 102 are installed between the first and second pressure plates 101, forming a hot medium channel 103 and a cold medium channel 104. The first pressure plate 1 is provided with a hot medium inlet pipe 3 and a hot medium outlet pipe 105 communicating with the hot medium channel 103, and a cold medium inlet pipe 106 and a cold medium outlet pipe 2 communicating with the cold medium channel 104. An immersion heat-conducting cover 201, made of copper, is provided at the end of the cold medium outlet pipe 2. The immersion heat-conducting cover 201 has a semi-circular structure extending into the interior of the cold medium outlet pipe 2. A paraffin wax loading sleeve 202 is installed on the side of the immersion heat-conducting cover 201 facing the interior of the cold medium outlet pipe 2. The inner wall of the paraffin wax loading sleeve 202 is filled with expanded paraffin wax 203, and the inner wall of the paraffin wax loading sleeve 202 is slidably mounted. A sealing diaphragm 204 is provided, and a trigger rod 205 is connected to one side surface of the sealing diaphragm 204. One end of the trigger rod 205 extends from the inside of the immersion heat conduction cover 201 to its outer surface. An adjustment assembly is installed inside the immersion heat conduction cover 201. A discharge hole 301 is provided on the peripheral wall of the heat medium inlet pipe 3. Several discharge holes 301 are arranged in a ring array and are equidistantly distributed on the peripheral wall of the heat medium inlet pipe 3. An adjustment piston 302 is slidably installed on the inner wall of the heat medium inlet pipe 3. An adjustment rod 303 is connected to the inner wall of the adjustment piston 302. The adjustment rod 303 extends from the inside of the heat medium inlet pipe 3 to its outside. An adjustment spring 304 is installed on the inner wall of the adjustment piston 302. One end of the adjustment spring 304 is in contact with one side surface of the inner wall of the adjustment piston 302, and the other end of the adjustment piston 302 is in contact with one side surface of the inner wall of the heat medium inlet pipe 3. A transmission assembly is connected between the adjustment rod 303 and the trigger rod 205.

[0018] Reference Figures 1-8 Specifically, the adjustment assembly includes a contact ring 206, which is disposed on the outer surface of the trigger rod 205. A limit ring 207 is fixedly installed on the outer surface of the paraffin loading sleeve 202. A reset spring 208 is installed on the inner wall of the limit ring 207. The bottom surface of the reset spring 208 is in contact with the top surface of the contact ring 206, and the top surface of the reset spring 208 is in contact with the top surface of the inner wall of the limit ring 207. The reset spring 208 is used to push the trigger rod 205 to reset through the contact ring 206. A clamping screw 107 is installed on one side surface of the first clamping plate 1. Several clamping screws 107 are arranged in a linear array on one side and the other side surface of the first clamping plate 1. A fixing bolt 108 is correspondingly distributed on the outer surface of each clamping screw 107. The second clamping plate 101 is in contact with the heat exchange plate 102.

[0019] Reference Figures 1-8Specifically, the transmission assembly includes a connecting block 4, which is installed on one side surface of the hot medium inlet pipe 3. One side surface of the connecting block 4 is fixedly connected to one side surface of the cold medium outlet pipe 2. A rotating shaft 401 is rotatably installed on the inner wall of the connecting block 4. A balance bar 402 is installed on the outer surface of the rotating shaft 401. The balance bar 402 is rotatably connected to the connecting block 4 through the rotating shaft 401. A displacement groove 403 is installed on one side surface of the balance bar 402. There are two displacement grooves 403, which are equidistantly distributed on one side surface of the balance bar 402. A connecting shaft 404 is correspondingly distributed on the inner wall of each of the two displacement grooves 403. One connecting shaft 404 is fixedly connected to one end of the adjusting rod 303, and the other connecting shaft 404 is fixedly connected to one end of the trigger rod 205.

[0020] Specific usage process: Before the energy-saving plate heat exchanger of the present invention is put into operation, the pipeline connection and installation must be completed. In specific operation, the external high-temperature fluid input pipeline is connected to the hot medium inlet pipe 3 set on the first pressure plate 1, and the cold medium inlet pipe 106 and the cold medium outlet pipe 2 are connected to the supply channels, thereby constructing a complete counter-current heat exchange loop. In the initial standby or low-temperature start-up state, the fluid temperature in the cold medium outlet pipe 2 is low, and the expanded paraffin 203 is in a contracted state. At this time, the adjusting spring 304 inside the hot medium inlet pipe 3 remains in a naturally extended state. Its elastic force acts on the inner wall of the adjusting piston 302, pushing the adjusting piston 302 outward. In this initial position, the adjusting piston 302 will not block the outlet holes 301 distributed in a ring array on the periphery of the hot medium inlet pipe 3, so that the heat source channel is in a fully open state, ensuring that the high-temperature heat source can be smoothly introduced between the heat exchange plates 102 at the maximum flow rate for heat exchange.

[0021] When the heat exchanger starts working, the hot and cold media undergo counter-current heat exchange within the hot media channels 103 and cold media channels 104 formed between several heat exchange plates 102. The cold media, having absorbed heat, collects and flows through the cold media discharge pipe 2. At this time, because the immersion heat-conducting cover 201 installed at the end of the cold media discharge pipe 2 adopts a semi-circular cover structure and extends directly into the flow channel, the heated fluid can directly envelop and continuously flush the outer wall of the copper heat-conducting cover 201. Heat penetrates the heat-conducting cover 201 and the paraffin loading sleeve 202 installed inside it, and is rapidly transferred to the filling inside. In the expanded paraffin 203, the terminal outlet water temperature is sensitively monitored. As the outlet temperature of the cold medium continues to rise and exceeds the set constant temperature threshold, the expanded paraffin 203 undergoes a phase change and its volume expands rapidly. Since the paraffin is tightly confined in the narrow inner cavity of the paraffin loading sleeve 202, the expanded paraffin can only release pressure in the direction of the only outlet. At this time, the sealing diaphragm 204 located on the inner wall of the paraffin loading sleeve 202 is displaced under the compression of the paraffin, which in turn pushes the trigger rod 205 connected to it. The trigger rod 205 then overcomes the resistance of the return spring 208 and extends outward in a straight line.

[0022] The outward extension of the trigger rod 205 is directly transmitted to the transmission assembly via the connecting shaft 404 at its top. The connecting shaft 404 slides within the displacement groove 403 on one side surface of the balance rod 402 and pushes the balance rod 402 upward, causing the balance rod 402 to rotate around the rotation shaft 401 installed in the connecting block 4. Under the action of the lever principle, the other end of the balance rod 402 produces a reverse pressing action, pressing down on the adjusting rod 303 located on the side of the heat medium inlet pipe 3. Under the mechanical thrust of the balance rod 402, the adjusting rod 303... The piston moves linearly into the heat medium inlet pipe 3. This thrust overcomes the elastic force of the adjusting spring 304, forcing the adjusting piston 302 to slide in the inner wall of the heat medium inlet pipe 3. As the adjusting piston 302 moves, its outer wall gradually blocks and closes the originally open outlet hole 301. The reduction in the opening area of ​​the outlet hole 301 directly restricts the flow rate of the external high-temperature heat source into the heat exchanger. The reduction in the heat source supply reduces the heat exchange intensity, thereby effectively curbing the further rise in the temperature of the cold medium outlet and achieving dynamic cooling.

[0023] In this closed-loop feedback process, if the outlet water temperature continues to rise abnormally, the volume expansion of the expanded paraffin 203 will further increase, causing the trigger rod 205 to extend a longer distance, and the rotation angle of the balance rod 402 to also increase. Ultimately, this leads to an increase in the inward movement of the regulating piston 302. This mechanical linkage process causes the area of ​​the discharge hole 301 to be continuously increased, significantly reducing or even completely cutting off the amount of heat entering, thereby achieving the safety protection effect of extreme anti-scalding and forced constant temperature. Conversely, when the fluid temperature in the cold medium discharge pipe 2 drops below the set value, the expanded paraffin 203 contracts due to the cold, reducing its volume, which in turn affects the sealing diaphragm 2. The thrust of trigger rod 205 and 04 disappears. At this time, the compressed regulating spring 304 releases its elastic potential energy, pushing the regulating piston 302 to move in the opposite direction to reset, reopening the discharge hole 301 and restoring the supply flow of the high-temperature heat source. At the same time, the regulating rod 303 pushes outward, pushing the balance rod 402 to rotate in the opposite direction, and in conjunction with the reset spring 208, pushes the trigger rod 205 back to the initial position, waiting for the next temperature regulation cycle. Through the above-mentioned purely mechanical closed-loop feedback process, the present invention accurately realizes automatic monitoring and dynamic adaptive constant temperature control of the terminal outlet water temperature of the plate heat exchanger without the need for external power drive.

[0024] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An energy-saving plate heat exchanger with high efficiency heat exchange, comprising a first pressing plate (1), a second pressing plate (101), and a plurality of heat exchange plates (102) between the first pressing plate (1) and the second pressing plate (101), wherein the first pressing plate (1) is provided with a hot medium inlet pipe (3), a hot medium outlet pipe (105), a cold medium inlet pipe (106), and a cold medium outlet pipe (2), characterized in that: An immersion heat-conducting cover (201) is provided at the end of the cold medium discharge pipe (2). A paraffin loading sleeve (202) is installed on the side surface of the immersion heat-conducting cover (201) facing the inside of the cold medium discharge pipe (2). The inner wall of the paraffin loading sleeve (202) is filled with expanded paraffin (203). A sealing diaphragm (204) is slidably installed on the inner wall of the paraffin loading sleeve (202). A trigger rod (205) is connected to one side surface of the sealing diaphragm (204). An adjustment component is installed inside the immersion heat-conducting cover (201). The heat medium inlet pipe (3) has a discharge hole (301) on its peripheral wall. An adjusting piston (302) is slidably installed on the inner wall of the heat medium inlet pipe (3). An adjusting rod (303) is connected to the inner wall of the adjusting piston (302). An adjusting spring (304) is installed on the inner wall of the adjusting piston (302). A transmission assembly is connected between the adjusting rod (303) and the trigger rod (205).

2. The energy-saving plate heat exchanger with high-efficiency heat exchange according to claim 1, characterized in that, The invasive heat-conducting cover (201) is made of copper. The invasive heat-conducting cover (201) is a semi-circular structure that extends into the interior of the cold medium discharge pipe (2). The discharge holes (301) are arranged in a ring array and are equidistantly distributed on the periphery of the hot medium inlet pipe (3). The adjusting rod (303) extends from the interior of the hot medium inlet pipe (3) to its exterior. One end of the trigger rod (205) extends from the interior of the invasive heat-conducting cover (201) to its outer surface. One end of the adjusting spring (304) is in contact with one side of the inner wall of the adjusting piston (302). The other end of the adjusting piston (302) is in contact with one side of the inner wall of the hot medium inlet pipe (3).

3. The energy-saving plate heat exchanger with high-efficiency heat exchange according to claim 1, characterized in that, The adjustment assembly includes a contact ring (206) disposed on the outer surface of the trigger rod (205), a limit ring (207) fixedly installed on the outer surface of the paraffin loading sleeve (202), a return spring (208) installed on the inner wall of the limit ring (207), a clamping screw (107) installed on one side surface of the first clamping plate (1), and a fixing bolt (108) threadedly installed on the outer surface of the clamping screw (107).

4. The energy-saving plate heat exchanger with high-efficiency heat exchange according to claim 3, characterized in that, The clamping screws (107) are a number of linear arrays distributed on one side and the other side of the first clamping plate (1). Each clamping screw (107) has a corresponding fixing bolt (108) distributed on its outer side surface. The second clamping plate (101) and the heat exchange plate (102) are in contact with each other.

5. The energy-saving plate heat exchanger with high-efficiency heat exchange according to claim 3, characterized in that, The bottom surface of the reset spring (208) is in contact with the top surface of the contact ring (206), and the top surface of the reset spring (208) is in contact with the top surface of the inner wall of the limiting ring (207). The reset spring (208) is used to push the trigger rod (205) to reset through the contact ring (206).

6. The energy-saving plate heat exchanger with high-efficiency heat exchange according to claim 1, characterized in that, The transmission assembly includes a connecting block (4), which is installed on one side surface of the heat medium inlet pipe (3). A rotating shaft (401) is rotatably installed on the inner wall of the connecting block (4). A balance bar (402) is installed on the outer surface of the rotating shaft (401). A displacement groove (403) is installed on one side surface of the balance bar (402). A connecting shaft (404) is slidably installed on the inner wall of the displacement groove (403).

7. The energy-saving plate heat exchanger with high-efficiency heat exchange according to claim 6, characterized in that, One side surface of the connecting block (4) is fixedly connected to one side surface of the cold medium discharge pipe (2). There are two displacement grooves (403). The two displacement grooves (403) are equidistantly distributed on one side surface of the balance rod (402). The inner walls of the two displacement grooves (403) are respectively distributed with connecting shafts (404). One of the connecting shafts (404) is fixedly connected to one end of the adjusting rod (303), and the other connecting shaft (404) is fixedly connected to one end of the trigger rod (205). The balance rod (402) is rotatably connected to the connecting block (4) through the rotating shaft (401).

Images