Heat exchange device for fruit juice sterilization

Abstract

The utility model belongs to food processing equipment technical field discloses a kind of heat exchange devices for juice sterilization, including shell, the inside of shell is equipped with heat exchange tube bundle, heat exchange tube bundle includes the straight pipe of multiple inside being equipped with helical flow guide rib and is arranged in circumferential array, the both ends of heat exchange tube bundle are fixed through tube sheet, and rotatable hollow rotating shaft is installed on tube sheet, the inside of hollow rotating shaft is connected with the tube inner cavity of heat exchange tube bundle, hollow rotating shaft is driven by driving part;The top diagonal of shell is respectively equipped with heat medium import and heat medium export, the both ends of shell are equipped with the sealing structure of with hollow rotating shaft dynamic cooperation, the inner wall of shell is equipped with several groups of spoiler, and several groups of spoiler are staggered distribution in shell. The utility model is through the combination design of helical flow guide rib, spoiler and rotating heat exchange tube bundle, can strengthen fluid turbulent effect, eliminate stagnation area, inhibit fruit flesh fiber and colloid deposition, can reduce scale risk and promote sterilization stability simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of food processing equipment technology, and in particular to a heat exchange device for sterilizing fruit juice. Background Technology

[0002] In the juice production process, sterilization is a key step to ensure product safety and extend shelf life. Plate heat exchangers and tubular heat exchangers are currently the most commonly used juice sterilization equipment. They indirectly heat the juice through thin metal plates or pipes to achieve the sterilization temperature.

[0003] However, existing heat exchange sterilization devices have the following problems: 1) Heat exchange dead zone and scaling problems: In the corners of the plates of plate heat exchangers or the inner walls of the pipes of tube heat exchangers, stagnation zones (i.e. "dead zones") are easily formed due to uneven fluid flow. Fruit pulp fibers and colloidal substances in juice are easily deposited and coked here, which not only reduces heat exchange efficiency, but also becomes a breeding ground for heat-resistant bacteria, affecting sterilization effect and product quality. 2) Poor adaptability to viscous juices: For cloudy juices containing a lot of pulp or juices with high viscosity, the flow is poor in traditional smooth channels, which is more likely to lead to a decrease in heat transfer coefficient and local overheating, resulting in a "burnt" taste and affecting the flavor of the juice. Therefore, we propose a heat exchange device for juice sterilization. Utility Model Content

[0004] In view of the problems of heat exchange dead zone, scaling and poor adaptability to viscous juice in the existing heat exchange devices for juice sterilization, this utility model is proposed.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A heat exchange device for sterilizing fruit juice includes a housing, inside which a heat exchange tube bundle is provided. The heat exchange tube bundle includes multiple straight tubes with internal spiral guide ribs arranged in a circumferential array. Both ends of the heat exchange tube bundle are fixed by a tube sheet, and a rotatable hollow shaft is mounted on the tube sheet. The interior of the hollow shaft is connected to the inner cavity of the heat exchange tube bundle, and the hollow shaft is driven by a driving component. The top of the housing has a heat medium inlet and a heat medium outlet installed diagonally, and the two ends of the housing are provided with sealing structures that are dynamically fitted to the hollow rotating shaft.

[0006] As a technical solution of the heat exchange device for sterilizing fruit juice according to the present invention, wherein: a number of sets of baffles for disturbing the fluid are installed on the inner wall of the shell, and the number of sets of baffles are staggered in the shell.

[0007] As a technical solution of the heat exchange device for fruit juice sterilization described in this utility model, the heat exchange tube bundle is made of food-grade stainless steel.

[0008] As a technical solution of the heat exchange device for fruit juice sterilization described in this utility model, the spiral guide rib is integrally formed with the inner wall of the straight pipe, and the spiral helix angle of the spiral guide rib is 30° to 60°.

[0009] As a technical solution of the heat exchange device for sterilizing fruit juice according to the present invention, there are two hollow rotating shafts, and each hollow rotating shaft is equipped with a connected rotary joint at the end away from the tube sheet. One rotary joint is equipped with a connected fruit juice inlet, and the other rotary joint is equipped with a connected fruit juice outlet.

[0010] As a technical solution of the heat exchange device for fruit juice sterilization described in this utility model, the sealing structure is a mechanical seal or a stuffing box seal.

[0011] As a technical solution of the heat exchange device for fruit juice sterilization described in this utility model, the driving component includes a driven gear fixedly installed on the outer surface of the hollow rotating shaft, a variable frequency motor is installed on the housing through a fixing plate, a driving gear is installed on the output shaft of the variable frequency motor, and the driving gear is meshed with the driven gear.

[0012] Compared with the prior art, the present invention has at least the following beneficial effects: 1. This utility model, through the combined design of spiral guide ribs, baffles and rotating heat exchange tube bundles, can enhance the fluid turbulence effect, eliminate stagnant areas, inhibit the deposition of fruit pulp fibers and colloids, and at the same time reduce the risk of scaling and improve sterilization stability.

[0013] 2. This utility model, through the synergy of an integrally formed spiral flow channel, frequency conversion speed regulation, and rotary joint, can optimize the fluidity of viscous fruit juice, avoid the "burnt" taste caused by local overheating, and at the same time ensure efficient heat transfer and continuous production. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a schematic diagram of the main structure of this utility model.

[0015] Figure 2This is a side view of the structure of this utility model.

[0016] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0017] Figure 4 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0018] Explanation of reference numerals in the attached figures: In the diagram: 1. Shell; 101. Heat medium inlet; 102. Heat medium outlet; 2. Heat exchanger tube bundle; 201. Spiral guide rib; 3. Tube sheet; 4. Hollow rotating shaft; 5. Rotary joint; 501. Juice inlet; 502. Juice outlet; 6. Sealing structure; 7. Fixing plate; 801. Driven gear; 802. Driven gear; 803. Variable frequency motor; 9. Baffle. Detailed Implementation

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0020] Reference Figures 1-4 A heat exchange device for sterilizing fruit juice is provided. This heat exchange device for sterilizing fruit juice includes a shell 1. The shell 1 is provided with a heat exchange tube bundle 2 inside. The heat exchange tube bundle 2 includes multiple straight tubes with spiral guide ribs 201 inside arranged in a circumferential array. The two ends of the heat exchange tube bundle 2 are fixed by a tube plate 3. A rotatable hollow shaft 4 is installed on the tube plate 3. The interior of the hollow shaft 4 is connected to the inner cavity of the tubes of the heat exchange tube bundle 2. The hollow shaft 4 is driven by a drive component. In application, the design of the spiral guide ribs 201 inside the heat exchange tube bundle 2 enhances the turbulence effect of the fruit juice and reduces fluid retention inside the tubes. At the same time, the hollow shaft 4 drives the heat exchange tube bundle 2 to rotate, which can further break the boundary layer and prevent fruit pulp deposition. The top of the shell 1 is equipped with a heat medium inlet 101 and a heat medium outlet 102 that are connected to each other. The two ends of the shell 1 are provided with sealing structures 6 that are dynamically matched with the hollow rotating shaft 4. In application, the diagonal layout of the heat medium inlet and outlet (heat medium inlet 101 and heat medium outlet 102) optimizes the shell-side fluid distribution, improves heat transfer uniformity, and reduces the risk of local overheating.

[0021] Reference Figure 3 The inner wall of the shell 1 is equipped with several sets of baffles 9 for disturbing the fluid. The baffles 9 are staggered in the shell 1. In application, the staggered baffles 9 enhance the disturbance of the shell fluid, eliminate the heat exchange dead zone, and prevent the heat medium from coking and the growth of heat-resistant bacteria.

[0022] Reference Figure 3 and Figure 4The heat exchange tube bundle 2 is made of food-grade stainless steel. In application, the food-grade stainless steel avoids chemical pollution, its corrosion resistance extends the equipment's lifespan, and it meets the hygiene standards for juice production.

[0023] Reference Figure 3 and Figure 4 The spiral guide rib 201 is integrally formed with the inner wall of the straight pipe, and the spiral angle of the spiral guide rib 201 is 30° to 60°. In application, the integral forming of the spiral guide rib 201 reduces the risk of fouling in the gaps. At the same time, the spiral angle of 30°-60° balances the guiding effect and flow resistance, adapting to the high-efficiency heat exchange requirements of juices with different viscosities.

[0024] Reference Figures 1-4 There are two hollow shafts 4. Each hollow shaft 4 is equipped with a connected rotary joint 5 at the end away from the tube sheet 3. One rotary joint 5 is equipped with a connected juice inlet 501, and the other rotary joint 5 is equipped with a connected juice outlet 502. In application, the combination of the double hollow shafts 4 and the rotary joints 5 enables continuous juice flow and avoids pipe blockage, which is especially suitable for high-viscosity juice containing pulp.

[0025] Reference Figure 3 and Figure 4 The sealing structure 6 is a mechanical seal or a stuffing box seal. In application, the mechanical seal or stuffing box seal ensures the sealing of rotating parts during long-term operation, preventing juice leakage and microbial contamination.

[0026] Reference Figure 1 The driving component includes a driven gear 801 fixedly mounted on the outer surface of the hollow rotating shaft 4. A variable frequency motor 803 (adjustable speed 20–100 rpm) is mounted on the housing 1 via a fixing plate 7. A drive gear 802 is mounted on the output shaft of the variable frequency motor 803. The drive gear 802 meshes with the driven gear 801. In application, the variable frequency motor 803 drives the gear set (drive gear 802 and driven gear 801) to adjust the speed of the heat exchange tube bundle 2, flexibly responding to different juice viscosities and sterilization temperature requirements.

[0027] The working principle of this utility model is as follows: Pretreatment stage: First, the heat medium (steam / hot water) is introduced into the shell 1 from the top diagonal heat medium inlet 101 and preheated to the sterilization temperature (such as 90–110℃). Then, the juice is pumped into the hollow rotating shaft 4 through the juice inlet 501 on the rotary joint 5 and distributed to each heat exchange straight tube. Sterilization stage: First, start the variable frequency motor 803 to drive the heat exchange tube bundle 2 to rotate (the speed is adjusted according to the viscosity of the juice: 30-50 rpm for low viscosity and 60-80 rpm for high viscosity). During this period, the juice forms a swirling flow under the action of the spiral guide rib 201, and the pulp fiber is thrown away from the tube wall by centrifugal force. At the same time, the shell side baffle 9 disrupts the laminar flow of the heat medium and eliminates dead zones. Cooling and output stage: After sterilization, the juice is collected by the hollow rotating shaft 4 at the other end and discharged from the juice outlet 502 through the rotary joint 5. At the same time, the heat medium continues to circulate, which can maintain a constant temperature (temperature difference ≤2℃). During shutdown maintenance: shut off the heat medium and juice supply, and flush the pipes with clean water. At the same time, periodically disassemble the rotary joint 5 to check for seal wear, and acid wash to remove trace amounts of scale.

[0028] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A heat exchange device for sterilizing fruit juice, characterized in that: The device includes a housing (1), inside which a heat exchange tube bundle (2) is provided. The heat exchange tube bundle (2) includes multiple straight tubes with spiral guide ribs (201) inside arranged in a circumferential array. The two ends of the heat exchange tube bundle (2) are fixed by a tube sheet (3), and a rotatable hollow shaft (4) is installed on the tube sheet (3). The interior of the hollow shaft (4) is connected to the inner cavity of the heat exchange tube bundle (2), and the hollow shaft (4) is driven by a driving component. The top of the housing (1) is equipped with a heat medium inlet (101) and a heat medium outlet (102) that are connected to each other. The two ends of the housing (1) are provided with sealing structures (6) that are dynamically matched with the hollow rotating shaft (4).

2. The heat exchange device for fruit juice sterilization according to claim 1, characterized in that: The inner wall of the housing (1) is equipped with several sets of baffles (9) for disturbing the fluid, and the several sets of baffles (9) are staggered inside the housing (1).

3. The heat exchange device for fruit juice sterilization according to claim 1, characterized in that: The heat exchange tube bundle (2) is made of food-grade stainless steel.

4. The heat exchange device for fruit juice sterilization according to claim 1, characterized in that: The spiral guide rib (201) is integrally formed with the inner wall of the straight pipe, and the spiral helix angle of the spiral guide rib (201) is 30° to 60°.

5. The heat exchange device for fruit juice sterilization according to claim 1, characterized in that: There are two hollow rotating shafts (4). Each hollow rotating shaft (4) is equipped with a connected rotary joint (5) at the end away from the tube sheet (3). One rotary joint (5) is equipped with a connected juice inlet (501), and the other rotary joint (5) is equipped with a connected juice outlet (502).

6. The heat exchange device for fruit juice sterilization according to claim 1, characterized in that: The sealing structure (6) is a mechanical seal or a stuffing box seal.

7. The heat exchange device for fruit juice sterilization according to claim 1, characterized in that: The driving component includes a driven gear (801) fixedly mounted on the outer surface of the hollow rotating shaft (4). The housing (1) is equipped with a variable frequency motor (803) via a fixing plate (7). A driving gear (802) is mounted on the output shaft of the variable frequency motor (803). The driving gear (802) meshes with the driven gear (801).

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