Refrigeration system of refrigeration house

Abstract

The refrigeration system comprises an outer machine and an inner machine, the inner machine is installed in the refrigeration house, the outer machine is installed outside the refrigeration house, and the outer machine internally comprises a compressor, a compressor enthalpy increasing opening, a four-way valve, a condenser, a liquid storage tank, an electronic expansion valve, a flash evaporator, a drying filter, a high-pressure valve and a low-pressure valve. The indoor unit comprises a high-pressure connecting pipe, an evaporator, a low-pressure connecting pipe and a fan; the utility model has the beneficial effects that the outdoor unit is arranged outside the refrigeration house, and the indoor unit is arranged in the refrigeration house, so that the refrigeration house is refrigerated; besides, the compressor enthalpy increasing opening is additionally formed in the compressor, the overall refrigeration effect can be maintained in the low-temperature environment, and the high-pressure pipe openings used for being matched with the first pipe body to be installed and welded are correspondingly formed in the ports of the high-pressure connecting pipe; the end opening of the low-pressure connecting pipe is provided with a low-pressure pipe opening used for being matched with the second pipe body to be installed and welded, and therefore the phenomenon that due to the fact that a sealing piece is in a low-temperature environment of minus 20 DEG C for a long time, hardening of the sealing piece is accelerated, and the sealing effect is lost is avoided.

Description

Technical Field

[0001] The utility model specifically relates to a cold storage refrigeration system. Background Art

[0002] Generally, cold storage is cooled by refrigeration machines, which use a liquid with a very low vaporization temperature (ammonia or Freon) as a coolant. It evaporates under low pressure and mechanically controlled conditions, absorbing heat from the storage room, thereby achieving the purpose of cooling. The most commonly used is the compression type refrigerator, which is mainly composed of a compressor, condenser, throttle valve and evaporator.

[0003] For example, the application number of the patent document is CN202020311313.X, and the name is an air supply system for a low-temperature refrigeration dehumidifier. The patent document records a cold storage refrigeration system part, wherein the cold storage is a cube, including a cold storage air outlet device, and the cold storage air outlet device is installed on the four corners of the top of the cold storage; the temperature sensor, there are no less than three temperature sensors, the temperature sensors are installed on the diagonals of the cold storage, and are evenly arranged, and the temperature sensors are not on the air outlet and the corners; the humidity sensor, there are no less than three humidity sensors, the humidity sensors are arranged along the length direction of the cold storage, and the humidity sensors are respectively located in the middle and bottom of the height direction of the cold storage, and the humidity sensors are not at the air outlet and the corners of the cold storage; the defrost temperature sensor, the defrost temperature sensor is installed on the evaporator; the suction pressure sensor; the variable frequency compressor, the evaporator is connected to the variable frequency compressor, and the suction pressure sensor is installed on the pipeline between the evaporator and the variable frequency compressor; the condenser, the condenser is connected to the variable frequency compressor; the electronic expansion valve, the electronic expansion valve is connected to the condenser and the evaporator respectively.

[0004] During use, the cold storage air outlet device is installed in the cold storage. When in refrigeration mode, the temperature inside the cold storage is always below zero degrees. Therefore, there are strict requirements for the sealing performance of the seals of the connection device used to connect the cold storage air outlet device to the external unit. As the seals are exposed to a low temperature environment of minus 20 degrees for a long time, the seals accelerate hardening and lose their sealing effect. For example, the refrigeration host (referred to as the external unit) connected to the cold storage air outlet device (referred to as the internal unit) is currently mainly connected through a nut connector via a connecting pipe. That is, the internal cold storage air outlet device is equipped with a stop valve for the refrigeration industry, and the external unit is also equipped with a stop valve for the refrigeration industry. Since the stop valve contains a rubber sealing ring (seal), but since the cold storage air outlet device is exposed to a low temperature environment of minus 20 degrees for a long time, the seals accelerate hardening and lose their sealing effect. These stop valves need to have their seals replaced regularly to maintain a good sealing effect, resulting in high maintenance costs.

[0005] In addition, when operating in a cold storage, the heat exchange capacity decreases, the return air volume from the normal return air port of the compressor decreases, the compressor power decreases, and the best effect cannot be achieved. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems in the prior art. To this end, one purpose of the present invention is to provide a cold storage refrigeration system that can maintain a refrigeration effect in a cold environment.

[0007] According to a cold storage refrigeration system of the present invention, it includes an outdoor unit and an indoor unit, the indoor unit is installed in the cold storage, and the outdoor unit is installed outside the cold storage, the outdoor unit includes a compressor, a compressor enthalpy increase port, a four-way valve, a condenser, a liquid storage tank, an electronic expansion valve, a flash evaporator, a drying filter, a high-pressure valve and a low-pressure valve, the compressor enthalpy increase port is connected to the flash evaporator, the compressor is connected to the D end of the four-way valve, the C end of the four-way valve is connected to one end of the condenser, the other end of the condenser is connected to the electronic expansion valve, the common end of the condenser and the electronic expansion valve is connected to the liquid storage tank, the electronic expansion valve is connected to the flash evaporator, the flash evaporator is connected to the drying filter, and the drying filter is connected to the high-pressure valve; the E end of the four-way valve is connected to the low-pressure valve, and the S end of the four-way valve is connected to the inlet end of the compressor;

[0008] The indoor unit includes a high-pressure pipe, an evaporator, a low-pressure pipe and a fan. The high-pressure pipe, the evaporator and the low-pressure pipe are connected in sequence. The fan is installed on the evaporator. The high-pressure valve is connected to the high-pressure pipe, and the low-pressure valve is connected to the low-pressure pipe.

[0009] The outer surfaces of the inner machines are respectively provided with insulation boxes, and the insulation boxes are installed with sealing nuts;

[0010] The high-pressure valve and the high-pressure connecting pipe are connected via a first pipe body;

[0011] The low-pressure valve and the low-pressure connecting pipe are connected via a second pipe body.

[0012] Furthermore, a low-pressure sensor and a return air temperature sensor are respectively installed on the pipeline between the S end of the four-way valve and the inlet end of the compressor.

[0013] Furthermore, a high-pressure pressure sensor and an exhaust temperature sensor are provided on the pipeline between the compressor and the D end of the four-way valve.

[0014] Furthermore, the condenser is provided with an ambient temperature sensor and a coil temperature sensor respectively.

[0015] Furthermore, a defrost temperature sensor is provided on the pipe body between the drying filter and the high-pressure valve.

[0016] Furthermore, the evaporator is provided with an internal temperature sensor.

[0017] Furthermore, the port of the high-pressure pipe is provided with a high-pressure pipe port adapted to be installed and welded to the first pipe body;

[0018] The port of the low-pressure connecting pipe is provided with a low-pressure pipe opening for fitting and welding the second pipe body.

[0019] The beneficial effects of the utility model are:

[0020] 1. This structure installs the external unit outside the cold storage and the internal unit inside the cold storage to cool the cold storage. In addition, a compressor enthalpy increase port is added to the compressor to maintain the overall cooling effect in a low temperature environment.

[0021] 2. A high-pressure pipe port is provided at the port of the high-pressure pipe connection for adapting to the installation and welding of the first pipe body; a low-pressure pipe port is provided at the port of the low-pressure pipe connection for adapting to the installation and welding of the second pipe body, thereby preventing the seal from hardening rapidly and losing its sealing effect due to being in a low temperature environment of minus 20 degrees for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings.

[0023] Figure 1 It is a structural diagram of the external unit of the present utility model.

[0024] Figure 2 yes Figure 1 Schematic diagram of the structure of the external unit from another angle.

[0025] Figure 3 It is a structural diagram of the internal unit of the present utility model.

[0026] Figure 4 It is a schematic diagram of the internal connection of the external unit of the utility model.

[0027] Figure 5 It is a schematic diagram of the internal connection of the indoor unit of the present utility model.

[0028] The markings shown in the figure are as follows:

[0029] Compressor 1, compressor enthalpy increase port 2, low-pressure pressure sensor 3, return air temperature sensor 301, high-pressure pressure sensor 4, exhaust temperature sensor 401, four-way valve 5, condenser 6, ambient temperature sensor 7, coil temperature sensor 8, liquid storage tank 9, electronic expansion valve 10, flash evaporator 11, filter drier 12, defrost temperature sensor 13, high-pressure valve 14, high-pressure stop valve 1401, low-pressure valve 15, low-pressure stop valve 1501, high-pressure connecting pipe 16, evaporator 17, internal temperature sensor 18, low-pressure connecting pipe 19, fan 20, external unit 21, insulation box 2101, sealing nut 2102, high-pressure pipe port 2103, low-pressure pipe port 2104, internal unit 22. DETAILED DESCRIPTION

[0030] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0031] Reference below Figures 1 to 5 A cold storage refrigeration system according to an embodiment of the present invention is described, comprising an outdoor unit 21 and an indoor unit 22, the indoor unit 22 being installed in the cold storage, the outdoor unit 21 being installed outside the cold storage, the outdoor unit 21 comprising a compressor 1, a compressor enthalpy increase port 2, a four-way valve 5, a condenser 6, a liquid storage tank 9, an electronic expansion valve 10, a flash evaporator 11, a drying filter 12, a high-pressure valve 14, and a low-pressure valve 15, the compressor enthalpy increase port 2 being connected to the flash evaporator 11, the compressor 1 being connected to the D end of the four-way valve 5 The C end of the four-way valve 5 is connected to one end of the condenser 6, the other end of the condenser 6 is connected to the electronic expansion valve 10, the common end of the condenser 6 and the electronic expansion valve 10 is connected to the liquid storage tank 9, the electronic expansion valve 10 is connected to the flash evaporator 11, the flash evaporator 11 is connected to the drying filter 12, and the drying filter 12 is connected to the high-pressure valve 14; the E end of the four-way valve 5 is connected to the low-pressure valve 15, and the S end of the four-way valve 5 is connected to the inlet end of the compressor 1;

[0032] The indoor unit 22 includes a high-pressure pipe 16, an evaporator 17, a low-pressure pipe 19 and a fan 20. The high-pressure pipe 16, the evaporator 17 and the low-pressure pipe 19 are connected in sequence. The fan 20 is installed on the evaporator 17. The high-pressure valve 14 is connected to the high-pressure pipe 16, and the low-pressure valve 15 is connected to the low-pressure pipe 19. Specifically, Figure 1 and Figure 4 As shown, the port of the high-pressure connecting pipe 16 is provided with a high-pressure pipe mouth 2103 for adapting to the installation and welding of the first pipe body (not shown in the figure), and the port of the low-pressure connecting pipe 19 is provided with a low-pressure pipe mouth 2104 for adapting to the installation and welding of the second pipe body. For this embodiment, the first pipe body and the second pipe body are both copper connecting pipes, that is, one end of the first pipe body is welded and fixed to the high-pressure pipe mouth 2103, and the other end of the first pipe body is connected to the high-pressure valve 14. Similarly, one end of the second pipe body is welded and fixed to the low-pressure pipe mouth 2104, and the other end of the second pipe body is connected to the low-pressure valve 15.

[0033] like Figure 1 As shown, an insulating box 2101 is provided on the outer surface of the indoor unit 22, and a sealing nut 2102 is installed on the insulating box 2101. The leads of the fan 20 in the indoor unit 22 are respectively placed in the insulating box 2101, and the sealing nut 2102 is used to tighten the wires and implement sealing, and the insulating box 2101 is used to further seal.

[0034] A low-pressure pressure sensor 3 and a return air temperature sensor 301 are installed on the pipe between the S end of the four-way valve 5 and the inlet end of the compressor 1. A high-pressure pressure sensor 4 and an exhaust gas temperature sensor 401 are installed on the pipe between the compressor 1 and the D end of the four-way valve 5.

[0035] The evaporator 17 is provided with an internal temperature sensor 18 , which is used to detect the temperature of the evaporator 17 .

[0036] like Figure 1 、 Figure 4 and Figure 5 As shown, in order to facilitate the connection between the outdoor unit 21 and the indoor unit 22, when the indoor unit 22 leaves the factory, one end of the first tube body (not shown in the figure) is welded to the high-pressure tube port 2103, and one end of the second tube body (not shown in the figure) is welded to the low-pressure tube port 2104. The outdoor unit 21 is respectively provided with a high-pressure stop valve 1401 connected to the other end of the first tube body and a low-pressure stop valve 1501 connected to the other end of the second tube body. For those skilled in the art, the stop valve is a threaded connection method. Since the first tube body and the second tube body have been welded to the indoor unit when leaving the factory, in actual use, the indoor unit and the outdoor unit are connected by a simple and mature threaded connection method, which effectively improves the usability and convenience of the product.

[0037] In this structure, the internal unit 22 is installed in the cold storage, and the external unit 21 is installed outside the cold storage, and the internal unit 22 refrigerates the cold storage; in addition, the compressor 1 is added with a compressor enthalpy increase port 2, which can maintain the overall refrigeration effect in a low temperature environment.

[0038] The refrigeration working principle of this embodiment is:

[0039] 1. Compression process: Compressor 1 compresses the gaseous refrigerant into high-temperature and high-pressure gas, which is then sent to the condenser 6 through the four-way valve 5;

[0040] 2. Condensation process: In the condenser 6, the high-temperature and high-pressure gaseous refrigerant is converted into a normal-temperature and high-pressure liquid refrigerant by heat dissipation;

[0041] 3. Throttling process: When the liquid refrigerant passes through the electronic expansion valve 10, the pressure drops sharply and turns into low-temperature and low-pressure liquid refrigerant. It also passes through the drying filter 12 and enters the high-pressure valve 14;

[0042] 4. Evaporation process: The high-pressure valve 14 transfers the refrigerant to the evaporator 17, where the low-temperature, low-pressure liquid refrigerant absorbs heat from the indoor air and evaporates into a low-temperature, low-pressure gaseous refrigerant, thereby lowering the indoor temperature. The gaseous refrigerant then returns to the compressor 1, starting a new cycle.

[0043] When the outdoor temperature is very low, the heat exchange capacity of the outdoor unit 21 decreases, the return air volume of the normal return air port of the compressor 2 is reduced, the power of the compressor 1 is reduced, and the best effect cannot be achieved; at this time, the compressor enthalpy increase port 2 and the flash evaporator 17 are used in combination to perform gas-liquid separation and achieve the enthalpy increase effect; by compressing and jetting mixed cooling at medium and low pressures, and then compressing normally at high pressures, the exhaust volume of the compressor 1 is increased.

[0044] Other configurations of this embodiment are as follows: an ambient temperature sensor 7 and a coil temperature sensor 8 are provided on the condenser 6. The ambient temperature sensor 7 is used to detect the external environment temperature, and the coil temperature sensor 8 is used to detect the liquid refrigerant temperature of the condenser 6.

[0045] A defrost temperature sensor 13 is provided on the pipe between the filter drier 12 and the high-pressure valve 14. Generally, frost causes the surface temperature of an object to drop. The defrost temperature sensor 13 detects whether frost has adhered to the surface of the object by sensing the temperature change on the surface.

[0046] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cold storage refrigeration system, comprising an outdoor unit (21) and an indoor unit (22), wherein the indoor unit (22) is installed inside the cold storage and the outdoor unit (21) is installed outside the cold storage, characterized in that: The external unit (21) includes a compressor (1), a compressor enthalpy increase port (2), a four-way valve (5), a condenser (6), a liquid storage tank (9), an electronic expansion valve (10), a flash evaporator (11), a drying filter (12), a high-pressure valve (14) and a low-pressure valve (15). The compressor enthalpy increase port (2) is connected to the flash evaporator (11), the compressor (1) is connected to the D end of the four-way valve (5), the C end of the four-way valve (5) is connected to one end of the condenser (6), and the condenser ( The other end of the condenser (6) is connected to the electronic expansion valve (10), the common end of the condenser (6) and the electronic expansion valve (10) is connected to the liquid storage tank (9), the electronic expansion valve (10) is connected to the flash evaporator (11), the flash evaporator (11) is connected to the drying filter (12), and the drying filter (12) is connected to the high-pressure valve (14); the E end of the four-way valve (5) is connected to the low-pressure valve (15), and the S end of the four-way valve (5) is connected to the inlet end of the compressor (1); The indoor unit (22) includes a high-pressure pipe (16), an evaporator (17), a low-pressure pipe (19) and a fan (20). The high-pressure pipe (16), the evaporator (17) and the low-pressure pipe (19) are connected in sequence. The fan (20) is installed on the evaporator (17). The high-pressure valve (14) is connected to the high-pressure pipe (16), and the low-pressure valve (15) is connected to the low-pressure pipe (19). An insulating box (2101) is provided on the outer surface of the inner machine (22), and a sealing nut (2102) is installed on the insulating box (2101); The high-pressure valve (14) and the high-pressure connecting pipe (16) are connected via a first pipe body; The low-pressure valve (15) and the low-pressure connecting pipe (19) are connected via a second pipe body.

2. A cold storage refrigeration system according to claim 1, characterized in that: A low-pressure sensor (3) and a return air temperature sensor (301) are respectively installed on the pipeline between the S end of the four-way valve (5) and the inlet end of the compressor (1).

3. The cold storage refrigeration system according to claim 1, characterized in that: A high-pressure pressure sensor (4) and an exhaust temperature sensor (401) are provided on the pipeline between the compressor (1) and the D end of the four-way valve (5).

4. The cold storage refrigeration system according to claim 1, characterized in that: The condenser (6) is provided with an ambient temperature sensor (7) and a coil temperature sensor (8).

5. The cold storage refrigeration system according to claim 1, characterized in that: A defrost temperature sensor (13) is provided on the pipe body between the drying filter (12) and the high-pressure valve (14).

6. The cold storage refrigeration system according to claim 1, characterized in that: The evaporator (17) is provided with an internal temperature sensor (18).

7. The cold storage refrigeration system according to claim 1, characterized in that: The port of the high-pressure connecting pipe (16) is provided with a high-pressure pipe opening (2103) for fitting and welding the first pipe body; The port of the low-pressure connecting pipe (19) is provided with a low-pressure pipe opening (2104) for fitting and welding the second pipe body.

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