Electrode type steam generator

Abstract

The utility model discloses an electrode type steam generator which comprises a cylinder body, a water inlet is fixedly connected to the bottom of the cylinder body, a steam outlet is fixedly connected to one side of the outer wall of the cylinder body, a grounding binding post is fixedly connected to the side, away from the steam outlet, of the cylinder body, and a blind flange is arranged at the top of the cylinder body. A fixed flange plate is fixedly connected in the flange blind plate, a three-phase binding post is arranged at the center of the top of the flange blind plate in a penetrating mode, a zero line binding post and a sensor interface are fixedly connected to the two ends of the top of the flange blind plate respectively, and an electrode assembly is arranged in the cylinder and comprises three electrode plates. And electrode binding posts are welded at the tops of the three electrode plates. Through mutual cooperation of the cylinder body, the electrode assembly and the shielding cover, the device is simple in structure, small in occupied space and low in operation cost, water quality parameters only need to be adjusted at a time before starting up, and water quality does not need to be adjusted in the operation process.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to an electrode type steam generator. Background Art

[0002] Electrode steam heater is one of the key components specially developed for electrode pulsating vacuum autoclave. Pulsating vacuum autoclave can meet the requirements of "Medical Sterilization Specification" when the steam temperature reaches 132℃-134℃ and the pressure is maintained for 4 minutes.

[0003] Electrode steam heaters have strict requirements on water quality. The main reason is that after heating electrodes of different water qualities, the current between the electrodes will increase exponentially, and the current will drop rapidly after reaching the boiling point. Ohm's law is not applicable to the current calculation of electrode heaters. If the cable cross-sectional area is selected according to the initial water temperature, when the temperature rises below the boiling point, the exponential increase in current will cause serious damage to the cable collapse. Therefore, electrode steam heaters must strictly control the ion content in the water during the heating process, that is, the conductivity, to ensure that the current always remains within a safe and stable value.

[0004] The existing method is to adjust the ion content in the water at any time as the temperature changes, so that the current can be kept stable within a certain value during the heating process. However, it is necessary to equip the water quality online detection equipment, deionized water equipment and pure water tank, water supply tank containing the specified concentration of ions, water supply pump, water quality laboratory and related technical personnel to meet the needs of stable operation of these heaters. These heater bodies and supporting equipment occupy a large area, the investment is relatively high, and the operating cost is high.

[0005] At present, there is no published mathematical model on the relationship between conductivity and electrode heating current at home and abroad, especially the calculation method of electrode heaters applicable to various water quality conditions is nowhere to be found. The design and manufacture of domestic low-voltage electrode heaters is in the exploration stage of no corresponding national standards, no mathematical models, no application calculation methods, no design standards, no manufacturing specifications, and no on-site commissioning technical standards.

[0006] The utility model summarizes the field operation data for many years and proposes an electrode type steam heater. Utility Model Content

[0007] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the name of the utility model of this application to avoid blurring the purpose of this section, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0008] In order to solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0009] An electrode type steam generator comprises a cylinder, wherein a water inlet is fixedly connected to the bottom of the cylinder, a steam outlet is fixedly connected to one side of the outer wall of the cylinder, a grounding terminal is fixedly connected to the side of the cylinder away from the steam outlet, a flange blind plate is arranged on the top of the cylinder, a fixed flange is fixedly connected inside the flange blind plate, a three-phase terminal is penetrated at the center of the top of the flange blind plate, a neutral terminal and a sensor interface are fixedly connected to the two ends of the top of the flange blind plate, and an electrode assembly is arranged inside the cylinder;

[0010] The electrode assembly comprises three electrode plates, the tops of the three electrode plates are all welded with electrode terminals, and a shielding cover is welded inside the cylinder.

[0011] As a preferred solution of the electrode type steam generator described in the utility model, an insulating sleeve is provided on the outer side wall of the electrode terminal, the top of the electrode terminal is fixed to the fixed flange by bolts, and the three electrode terminals are respectively connected to the A, B, and C phases of the three-phase terminal.

[0012] As a preferred solution of the electrode type steam generator described in the utility model, two adjacent electrode plates are fixed by positioning bolts, an insulating sleeve is provided outside the positioning bolts, and the electrode plates are fixed by insulating support columns composed of the positioning bolts and the insulating sleeves, thereby ensuring that the parallel distance between the electrode plates remains unchanged when the electrode plates are heated.

[0013] As a preferred solution of the electrode-type steam generator described in the utility model, the shielding cover is cylindrically arranged, located outside the three electrode plates, and is made of stainless steel to absorb stray current leaking from the tip of the electrode plate to prevent the system from being electrified.

[0014] As a preferred solution of the electrode-type steam generator described in the utility model, the three electrode plates are arranged at an angle of 120° along the center, and the distance between two adjacent electrode plates is 20 mm. The three electrode plates together form three pairs of parallel electrodes to heat the water together.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model cooperates with each other among the cylinder, the electrode assembly and the shielding cover. The device has a simple structure, occupies a small space and has a low operating cost. It only needs to adjust the water quality parameters once before starting the machine, and there is no need to adjust the water quality during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the implementation of the utility model, the utility model will be described in detail below in combination with the drawings and detailed implementation. Obviously, the drawings described below are only some implementations of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0018] Figure 1 It is a three-dimensional diagram of the electrode type steam generator of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the electrode type steam generator of the utility model;

[0020] Figure 3 The utility model is a schematic diagram of the electrode assembly structure of the electrode type steam generator.

[0021] Legend: 1. Cylinder; 2. Water inlet; 3. Steam outlet; 4. Grounding terminal; 5. Blind flange plate; 6. Three-phase terminal; 7. Neutral terminal; 8. Sensor interface; 9. Electrode assembly; 901. Electrode plate; 902. Electrode terminal; 903. Positioning bolt; 10. Fixed flange; 11. Shielding cover. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0023] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the implementation of the present invention, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0024] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] See also Figure 1-3 The utility model provides an electrode type steam generator, including a cylinder 1, a water inlet 2 is fixedly connected to the bottom of the cylinder 1, a steam outlet 3 is fixedly connected to one side of the outer wall of the cylinder 1, a grounding terminal 4 is fixedly connected to the side of the cylinder 1 away from the steam outlet 3, a flange blind plate 5 is arranged on the top of the cylinder 1, a fixed flange 10 is fixedly connected inside the flange blind plate 5, a three-phase terminal 6 is penetrated at the center of the top of the flange blind plate 5, and a neutral terminal 7 and a sensor interface 8 are fixedly connected to the two ends of the top of the flange blind plate 5 respectively.

[0026] An electrode assembly 9 is arranged inside the cylinder 1, and the electrode assembly 9 includes three electrode plates 901, wherein the three electrode plates 901 are arranged at a 120° angle along the center, and two adjacent electrode plates 901 are parallel to each other and the distance between them is 20 mm. The three electrode plates 901 together form three pairs of parallel electrodes to heat the water together.

[0027] Electrode terminals 902 are welded on the top of the three electrode plates 901, and an insulating sleeve is provided on the outer wall of the electrode terminals 902. The top of the electrode terminals 902 is fixed to the fixed flange 10 by bolts. The three electrode terminals 902 are respectively connected to the A, B, and C phases of the three-phase terminals 6.

[0028] Two adjacent electrode plates 901 are fixed by positioning bolts 903, and an insulating sleeve is provided outside the positioning bolts 903. The positioning bolts 903 are fixed by insulating support columns composed of the positioning bolts 903 and the insulating sleeve, ensuring that the parallel distance between the electrode plates 901 remains unchanged when the electrode plates 901 are heated.

[0029] A shielding cover 11 is welded inside the cylinder 1. The shielding cover 11 is cylindrical and located outside the three electrode plates 901. The shielding cover 11 is made of stainless steel and is used to absorb stray current leaking from the tip of the electrode plate 901 to prevent the system from being charged.

[0030] When in use, the device is divided into two types, high voltage type and low voltage type, according to the operating voltage. The utility model is suitable for low voltage alternating current with a voltage of ≤0.4KV.

[0031] The principle of the electrode steam generator is: when the electrode assembly 9 consisting of a pair of electrode plates 901 with equal spacing is inserted into water containing a certain concentration of conductive ions, and the electrode plates 901 are connected to an AC voltage, the electrode plates 901 and the immersed water form an AC current loop. When the AC current passes through the loop, the conductive ions in the water move back and forth between the plates under the action of the electric field and are converted into heat energy. After absorbing enough heat energy, the water molecules are converted into kinetic energy, i.e., water vapor. The amount of steam is closely related to parameters such as the size of the steam pressure, the conductivity of the water, the area of ​​the electrode plates, the distance between the electrode plates, and the voltage between the electrode plates.

[0032] The utility model summarizes a large amount of operating data and provides a mathematical model of the electrode steam heater. The mathematical model can strictly describe the mathematical relationship between various parameters: when the electrode steam heater is running at full load, the heat load power N is proportional to the product of the area S of the electrode plate 901, the conductivity γ of the water, and the height H of the water level; and is inversely proportional to the distance d between the electrode plates 901.

[0033]

[0034] When the heater is running, the area S of the electrode plate 901 and the distance d of the electrode plate 901 are fixed values. When the water temperature rises, the conductivity γ of the water gradually increases, and the heat load power N increases accordingly, that is, the current increases. In the initial heating stage, the conductivity γ is low, the current is small, and the heating speed is slow; only when the water temperature rises to 95°C, the current reaches the peak value, that is, the electrode steam heater is in full load operation, and the peak current is the designed full load current. Among them, the effective area of ​​the electrode plate 901 refers to the area of ​​the completely corresponding parallel electrode plates 9001.

[0035] When the areas of the two electrodes are not equal, take the smallest corresponding area value.

[0036]

[0037] To reduce the size of the heater, a high-power heater can be realized by combining several pairs of electrode plates 901. In this embodiment, three electrode plates 901 are provided to form three pairs of parallel electrodes (generally, the number of electrode plates for a single-phase power supply is a multiple of 2, and the number of electrode plates for a three-phase power supply is a multiple of 3).

[0038] The distance d between electrodes is related to the conductivity γ of water and the voltage of the electrode plates. For tap water or groundwater, the distance d between the electrodes must not be less than the breakdown voltage value when the water quality is below the boiling point, and must be ≥2cm.

[0039] The conductivity γ is related to the water quality and water temperature. When heated, the water temperature continues to rise, the ion activity increases, and the current increases exponentially. When the water temperature reaches the boiling point, the current begins to drop rapidly. This is because the steam bubbles in the electric field prevent the water resistance from contacting the electrode plate 901 (the conductivity value of the water quality when it is 5°C below the boiling point, i.e. 95°C, is taken during the design).

[0040] Water flow Q is the main parameter for adjusting current. The flow is adjusted by the water pump inverter according to the temperature difference △t to keep the current stable within the full load value.

[0041] The following is a method for determining the water flow rate Q when the heater is running at full load.

[0042] Based on: Heat load power N = 1.163cm△t kw / H

[0043]

[0044] Traditional electric heating tube heaters must be filled with water before working, and the power can be turned on only after the water level is higher than the electric heating tube. Otherwise, the resistance wire in the electric heating tube will melt due to high temperature, causing the heating tube to fail and be damaged.

[0045] This device is different from the others. When there is no water, it is equivalent to open circuit of power supply, and the heater will not burn out. This device can be powered on first and then water can be added. When the sensor reads the specified water level, the water inlet valve is closed, and finally the heater starts heating.

[0046] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrode steam generator, comprising a cylinder (1), characterized in that: The bottom of the cylinder (1) is fixedly connected with a water inlet (2), one side of the outer wall of the cylinder (1) is fixedly connected with a steam outlet (3), the side of the cylinder (1) away from the steam outlet (3) is fixedly connected with a grounding terminal (4), a flange blind plate (5) is arranged at the top of the cylinder (1), a fixed flange plate (10) is fixedly connected inside the flange blind plate (5), a three-phase terminal (6) is arranged through the center of the top of the flange blind plate (5), the two ends of the top of the flange blind plate (5) are respectively fixedly connected with a neutral terminal (7) and a sensor interface (8), and an electrode assembly (9) is arranged inside the cylinder (1); The electrode assembly (9) comprises three electrode plates (901), the tops of the three electrode plates (901) are all welded with electrode terminals (902), and a shielding cover (11) is welded inside the cylinder (1).

2. The electrode type steam generator according to claim 1, characterized in that: An insulating sleeve is provided on the outer side wall of the electrode terminal (902), and the top of the electrode terminal (902) is fixed to the fixing flange (10) by bolts.

3. The electrode type steam generator according to claim 1, characterized in that: Two adjacent electrode plates (901) are fixed by means of positioning bolts (903), and an insulating sleeve is provided outside the positioning bolts (903).

4. The electrode type steam generator according to claim 1, characterized in that: The shielding cover (11) is arranged in a cylindrical shape, and the shielding cover (11) is located outside the three electrode plates (901).

5. The electrode type steam generator according to claim 1, characterized in that: The three electrode plates (901) are arranged at a 120° angle along the center, and two adjacent electrode plates (901) are parallel to each other and the distance between them is 20 mm.

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