CN101324380A - Cold storage frost-free refrigeration system - Google Patents

Abstract

The invention discloses a frost-free refrigeration system for a cold storage, aiming to provide a frost-free refrigeration system for a cold storage that can be defrosted in time during use, so as to achieve the purpose of energy saving, ensure a uniform temperature field in the storage, and be convenient to use . It includes an evaporator, the evaporator is composed of multiple groups of fin heat exchangers arranged at intervals and connected in parallel, and a water receiving tray is arranged at the lower part of each group of fin heat exchangers, and the water receiving tray is connected with a The telescopic water baffle covers the lower part of the fin heat exchanger, and the telescopic water baffle is connected with the telescopic driving mechanism, and the telescopic driving mechanism is connected with the refrigeration system controller; the lower end of the water receiving tray has a drain port. The refrigerating system of the present invention adopts multiple groups of finned heat exchangers, which can be divided into multiple groups so that the heat exchangers can be flexibly operated to ensure uniform temperature field in the storage. The treatment of defrosting water is very convenient, so that the defrosting operation is simple and convenient, and the user can defrost in time to improve the cooling efficiency of the system and achieve the purpose of energy saving.

Description

Cold storage frost-free refrigeration system

technical field

The invention relates to a refrigeration system, more specifically, to a frost-free refrigeration system suitable for cold storage.

Background technique

The evaporator in the food cold storage refrigeration system generally adopts an integrated top-row or wall-tube heat exchanger, and the surface is prone to frost during use. After the surface of the evaporator is frosted, ① due to the low thermal conductivity of the frost layer, the formation The thermal resistance is reduced, resulting in a decrease in the heat transfer; ②As the frost layer blocks the gap between the fins, the air resistance through the fins of the cooler increases. Therefore, the existence of the frost layer will deteriorate the heat transfer and reduce the cooling efficiency, so it is very important to defrost in time.

For traditional cold storage evaporators, there are many defects in defrosting. First of all, in terms of food safety, when traditional cold storage evaporators use hot air defrosting or electric heating defrosting, since the heat exchanger is not isolated from the cold space during defrosting, the melting of frost will not only make the items damp, but also The items are bonded into blocks, and the defrosting will have a certain impact on the temperature field in the storage, resulting in large temperature fluctuations in the room, and the rise in storage temperature will damage the storage quality of food. Therefore, it generally takes a long time for the user to defrost once, resulting in a reduction in the cooling efficiency of the refrigeration system.

For the pipes in the refrigerated room of frozen objects, it is not advisable to use the method of "melting" frost to defrost, and it is even less allowed to defrost by water. Manual defrosting is cumbersome. It requires manual defrosting, clearing the frost water, and moving items in the storage. Usually, it takes a long time or even several months for the user to defrost once. When defrosting, the frost layer is already very thick. The thermal resistance has made the evaporator far from achieving the cooling effect, and frequent defrosting may also cause large fluctuations in the temperature field in the storage, which has a great impact on the quality of the items, especially the items in open packaging.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a frost-free refrigeration system for cold storage that can be defrosted in time during use, thereby achieving the purpose of energy saving, ensuring uniform temperature field in the storage, and being convenient to use.

The present invention realizes through following technical scheme:

A frost-free refrigeration system for cold storage, which is characterized in that it includes an evaporator, the evaporator is composed of multiple groups of fin heat exchangers arranged at intervals and connected in parallel, and the bottom of each group of fin heat exchangers is provided with a connection A water tray, the water receiving tray is connected with a telescopic water baffle that can cover the lower part of the fin heat exchanger after being stretched, and the telescopic water baffle is connected with a telescopic drive mechanism, and the telescopic drive mechanism is connected with the refrigeration system control connected to the device; the lower end of the water receiving tray is provided with a drain, and the drain is connected to a drain pipe. The area of the water receiving tray is smaller than the cross-sectional area of the fin heat exchanger.

The telescopic water retaining plate is formed by connecting and combining a plurality of telescopic plates. On one side of the uppermost telescopic plate, there is a guide groove with an open upper end and a closed bottom end; Guide groove, the upper part of the other side is provided with a guide column corresponding to the guide groove, the lower end of the lowermost telescopic plate is fixedly connected with the water receiving tray, and the upper part of the lowermost telescopic plate is provided with a guide column matching the guide groove, and the adjacent The two telescopic plates are connected through sliding fit between the guide post and the guide groove. In order to make a plurality of telescopic plates form a whole, screws are provided at the opening ends of the guide slots of each telescopic plate.

The telescopic driving mechanism includes a pulley block located on the upper part of the water receiving tray, the steel wire on the pulley in the pulley block is connected to the uppermost telescopic plate, the pulley block is connected to an asynchronous motor through a transmission mechanism, and the asynchronous motor is connected to a refrigeration system controller .

A pressure sensor is arranged at the inlet of the compressor, and the pressure sensor is connected with the refrigeration system controller.

In order to ensure that the generated cooling capacity forms a good natural convection in the control track, the lower parts on both sides of each set of fin heat exchangers are respectively equipped with baffles to control the cooling capacity transmission path and prevent the defrosting heat from spreading into the storage room. .

The present invention has following technical effect:

1. The structure of the evaporator part in the refrigeration system of the present invention adopts multiple sets of fin heat exchangers instead of the traditional integrated top-row or wall-tube heat exchangers. Operation: According to the demand of cooling capacity, the opening and closing control of some fin heat exchangers can be carried out; the cooling and defrosting conditions between the fin heat exchangers can be independently carried out, so that some fin heat During frost, other fin heat exchangers can be refrigerated to ensure uniform temperature field in the storage. Secondly, since the volume of each fin heat exchanger is relatively reduced, the treatment of defrosting water is very convenient. Finally, since the volume of each fin heat exchanger is relatively reduced, it is beneficial to adopt the method of telescopic water baffle, so as to ensure that the fin heat exchanger is completely isolated from the cold environment in the defrosting state, and the melting of frost will not cause The items are damp, and it will not affect the distribution of the temperature field in the warehouse, and will not affect the quality of the items in the warehouse. Therefore, the refrigeration system of the present invention makes the defrosting operation simple and convenient for any defrosting method, and the user can defrost in time to improve the refrigeration efficiency of the system, thereby achieving the purpose of energy saving.

2. The refrigerating system of the present invention is equipped with baffles on both sides of the fin heat exchanger, so that the baffles cooperate with the fin heat exchanger and the water tray to form a cold transmission track, which can ensure the generation of The cooling capacity forms a good natural convection in the control track, which ensures the reasonable utilization of the cooling capacity, improves the cooling efficiency and saves energy. Since the present invention adopts the circulation mode of natural convection of cooling capacity, it will not increase the degree of dry consumption of the items in the warehouse, and is especially suitable for storing open-packed items. During the defrosting process, the side baffles can also prevent the defrosting heat from spreading into the cold storage.

3. With the cooperation of the telescopic drive mechanism, the telescopic water baffle can completely wrap the lower part of the fin heat exchanger and completely isolate it from the food storage space, so that it will not pollute the storage space during defrosting Two, the temperature in the warehouse will not fluctuate greatly, which ensures that the defrosting is convenient, fast, safe and reliable. Moreover, it saves the trouble of manual defrosting and is more convenient to use.

Description of drawings

Fig. 1 is a structural schematic diagram of a set of fin heat exchangers in which telescopic water baffles are located in the water receiving tray in the frost-free refrigeration system of the cold storage according to the present invention;

Fig. 2 is a structural schematic diagram of the part of the heat exchanger wrapped by the telescopic water barrier in the frost-free refrigeration system of the cold storage of the present invention;

Fig. 3 is the front view of the telescopic plate in the middle part of the telescopic water barrier;

Fig. 4 is the back view of Fig. 3;

Fig. 5 is the top view of Fig. 3;

Fig. 6 is a top view of the telescopic plate part at the uppermost end;

Fig. 7 is a plan view of the lowermost telescopic plate part.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The frost-free refrigeration system of the cold storage of the present invention improves the evaporator part on the basis of the existing refrigeration system, and adopts multiple sets of fin heat exchangers to replace the traditional integrated top row or wall row tube heat exchangers. Thereby it is beneficial to defrosting and achieves the purpose of energy saving. The structure of other parts adopts the existing structure. For the defrosting method, various existing defrosting methods can be used, and the hot air defrosting method is recommended. For hot gas defrosting, first install a solenoid valve between each fin heat exchanger and the liquid distribution station, and for ammonia systems, install a gas conditioning station between the oil separator and the heat exchanger, and here A solenoid valve is installed on the pipeline connecting the gas regulating station to each fin heat exchanger. Under refrigeration conditions, the solenoid valve on the pipeline of the gas regulating station is closed. In the case of defrosting, first close the pipeline of the liquid regulating station The corresponding solenoid valve, when the compressor pumps out the refrigerant in the fin heat exchanger that needs to be defrosted, opens the solenoid valve on the pipeline of the gas regulating station to deliver hot ammonia gas for defrosting, and the defrosting time is about 20 minutes Left and right, each group of fin heat exchangers has the same defrosting operation method, and can be carried out independently.

The evaporator in the frost-free refrigeration system of the cold storage of the present invention is composed of multiple sets of fin heat exchangers arranged at intervals and connected in parallel. and cooling capacity is determined. The structural schematic diagram of a group of fin heat exchangers is shown in Figure 1 and Figure 2. A water receiving tray 4 is provided at the lower part of each group of fin heat exchangers. The water receiving tray 4 is connected with a The telescopic water retaining plate 3 at the bottom of the fin heat exchanger is connected with the telescopic driving mechanism. The telescopic driving mechanism is connected with the refrigeration system controller. The lower end of the water receiving tray 4 is provided with a drain port 5, and the drain port 5 is connected with a drain pipe. Wherein, the telescopic drive mechanism can adopt any one of electric drive, hydraulic drive and pneumatic drive. The area of the water receiving tray is smaller than the cross-sectional area of the fin heat exchanger.

In order to prevent the heat from defrosting from spreading around the cold storage, and to make the cooling capacity form a better natural convection cycle within the controlled trajectory, control cooling capacity transmission devices are installed on the lower parts of each set of fin heat exchangers 1 on both sides. The path and the baffles 2 and 6 that can prevent the defrosting heat from spreading into the storage. When the distance between two adjacent sets of fin heat exchangers is relatively small, the adjacent two sets of fin heat exchangers can also share one baffle.

In order to realize automatic defrosting, a pressure sensor is provided at the inlet of the compressor, and the pressure sensor is connected with the refrigeration system controller. The pressure sensor detects the pressure value at the inlet of the compressor, and the refrigeration system controller judges whether defrosting is required based on the pressure value fed back by the pressure sensor, so as to control the defrosting and refrigeration working conditions.

The baffles are installed on both sides of the fin heat exchanger to control the transmission path of the cooling capacity, so that the cooling capacity forms a better natural convection cycle within the controlled track. The telescopic water baffle can be stretched under the drive of the telescopic drive mechanism. Under the cooling condition, the telescopic water baffle shrinks inside the water receiving tray. Under the defrosting condition, the telescopic water baffle can be unfolded and Completely wrap the lower part of the fin heat exchanger so that all the defrosting enters the water receiving tray, and the side baffles can prevent the defrosting heat from spreading into the storage, ensuring the convenience, safety and reliability of defrosting.

Under cooling conditions, the cooling capacity will undergo natural convection circulation along the control trajectory shown in Figure 1. The cooling capacity will flow out from the upper opening of the fin heat exchanger and the side baffle, and then flow in from the lower opening of the two through circulation. , thus forming a natural convection circulation path. Under the defrosting condition, the fin heat exchanger exits the refrigeration cycle and does not generate cooling capacity. The side baffle is generally installed in the middle of the fin heat exchanger. The distance from the fin heat exchanger is mainly determined by the expansion angle of the telescopic water baffle. When defrosting starts, the hot air is wrapped around the side baffle and the telescopic baffle In the combined space of the water board, heat is prevented from spreading outward. The distance between the baffle plate and the fin heat exchanger is generally about 35 cm, and the specific size depends on the size of the fin heat exchanger.

When the refrigeration system controller receives the defrosting signal from the pressure sensor at the inlet of the compressor, it controls the action of the telescopic drive mechanism, drives the telescopic water baffle to fully expand and wraps the lower part of the fin heat exchanger completely, and the final state of expansion is as follows: As shown in Figure 2, it can ensure that the defrosting water does not penetrate into the storage. The drain at the lower part of the water tray is connected to the drain pipe. When the frost is basically melted and the defrosted water is completely drained through the drain, the telescopic water baffle will not shrink immediately, but the telescopic water baffle will be stretched by the heat of defrosting. Trapped water droplets on the upper side dry. When the upper side of the side baffle is dried, under the control of the refrigeration system controller, the unit immediately turns into the cooling state, and when the generated cooling capacity neutralizes the heat left over from defrosting, some cooling capacity is collected , when the cooling capacity reaches a certain value, the refrigeration system controller receives the signal sent by the compressor inlet pressure sensor, controls the action of the telescopic drive mechanism, and the telescopic water baffle shrinks into the water receiving tray, and the final state is shown in Figure 1.

The telescopic water baffle can adopt various telescopic forms. The telescopic water blocking plate in this embodiment is formed by connecting and combining a plurality of expansion plates. The top view of the uppermost expansion plate part is shown in Figure 6. On one side of the uppermost expansion plate 8-2, there is an open upper end and a closed lower end. Guide groove 9-2. The schematic diagrams of the telescopic plate in the middle part are shown in Fig. 3, Fig. 4, and Fig. 5. On one side of the telescopic plate 8-1 in the middle part, a guide groove 9-1 with an open upper end and a closed lower end is provided, and a guide groove 9-1 with an open upper end and a closed bottom end is arranged on the other side. The corresponding guide post 7-1 of the guide groove. The top view of the lowermost expansion plate part is as shown in Figure 7, the lower end of the lowermost expansion plate is fixedly connected with the water tray, and the uppermost expansion plate 8-3 is provided with a guide post 7- that matches the guide groove. 2. Two adjacent telescopic plates are respectively connected by sliding fit with guide posts and guide grooves. The guide post of the telescopic plate below is installed in the guide groove of the telescopic plate above. In order to improve the service life, the telescopic plate adopts metal plate.

The telescopic driving mechanism includes a block pulley 10 positioned at the top of the water receiving tray, and the steel wire on the pulley in the block pulley is connected with the telescopic plate at the top. The pulley block is connected with the asynchronous motor through the transmission mechanism, and the asynchronous motor is connected with the refrigeration system controller.

When the expansion plate needs to be opened, the refrigeration system controller controls the rotation of the asynchronous motor, which drives the steel wire in the pulley block to move upward, thereby driving the uppermost expansion plate to move upward. During the movement, the guide groove on the uppermost expansion plate is closed. When one end is in contact with the guide post of the lower telescopic board, it drives the lower telescopic board to move upwards, and the movement of the other telescopic boards is the same. When the end closed by the guide groove of the upper telescopic board contacts the guide post of the lower telescopic board, Drive the expansion plate below to move upward until the expansion plate is fully unfolded, and the refrigeration system controller controls the asynchronous motor to stop. When contraction is required, the refrigeration system controller controls the asynchronous motor to rotate in the opposite direction, driving the steel wire in the pulley block to move downward, and driving the uppermost expansion plate to move downward, and the expansion plate automatically contracts by gravity. In order to make each telescopic board have a strong effect on each other, after the baffle is assembled, a screw is provided at the opening end of each telescopic board guide groove. When the telescopic board shrinks, the whole under the action of gravity, finally reaches shrinking state.

Although the disclosed frost-free refrigeration system for a refrigerator has been specifically described with reference to the embodiments, the above-described embodiments are illustrative rather than restrictive, and without departing from the spirit and scope of the present invention, All changes and modifications are within the scope of the present invention.

Claims (7)

1, a kind of cold storage hoarfrost-free type refrigeration system, it is characterized in that, comprise evaporimeter, described evaporimeter is made up of the many groups of fin heat exchangers of arranging at interval and being connected in parallel, bottom at every group of fin heat exchanger is provided with saucer, be connected with the flexible water fender that can encase fin heat exchanger bottom after trailing on the described saucer, described flexible water fender is connected with telescopic drive mechanism, and described telescopic drive mechanism is connected with refrigerant system controller; The lower end of described saucer is provided with discharge outlet, and described discharge outlet is connected with drainpipe.

2, cold storage hoarfrost-free type refrigeration system according to claim 1, it is characterized in that, described flexible water fender is combined by a plurality of expansion plates connections, the one side of expansion plate topmost is provided with the guide groove of upper end open lower end closed, one side is provided with the guide groove of upper end open lower end closed on the expansion plate of mid portion, another side top is provided with and the corresponding guide pillar of guide groove, fixedly connected with saucer in the lower end of expansion plate bottom, be provided with the guide pillar that matches with guide groove on expansion plate top bottom, between two adjacent expansion plates by guide pillar and guide groove sliding connection.

3, cold storage hoarfrost-free type refrigeration system according to claim 2, it is characterized in that, described telescopic drive mechanism comprises the assembly pulley that is positioned at saucer top, steel wire on the described assembly pulley middle pulley is connected with expansion plate topmost, described assembly pulley is connected with asynchronous machine by transmission mechanism, and described asynchronous machine is connected with refrigerant system controller.

According to claim 2 or 3 described cold storage hoarfrost-free type refrigeration systems, it is characterized in that 4, each expansion plate guide groove open end is provided with screw.

5, cold storage hoarfrost-free type refrigeration system according to claim 1 is characterized in that, the area of described saucer is less than the sectional area of fin heat exchanger.

6, cold storage hoarfrost-free type refrigeration system according to claim 1 is characterized in that, is provided with pressure sensor in the porch of compressor, and described pressure sensor is connected with refrigerant system controller.

7, cold storage hoarfrost-free type refrigeration system according to claim 1 is characterized in that, the both sides of every group of fin heat exchanger portion on the lower side are provided with the baffle plate that control cold transmission path also can stop defrosting heat to spread respectively in the storehouse.

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