Fluorine pump air conditioner and control method thereof

Abstract

The invention provides a fluorine pump air conditioner and a control method thereof.The fluorine pump air conditioner comprises a first circulation assembly and a heat exchanger, the first circulation assembly comprises a fluorine pump, a liquid storage tank, a heat regenerator and an evaporator, an input pipeline is connected between the output end of the fluorine pump and the input end of the evaporator, and the output end of the evaporator is connected to the first input end of the heat regenerator; the first output end of the heat regenerator is connected to the first input end of the heat exchanger, the first output end of the heat exchanger is connected to the output end of the liquid storage tank, the output end of the liquid storage tank is connected to the input end of the fluorine pump, a bypass pipeline is connected between the output end of the fluorine pump and the second input end of the heat regenerator, and the second output end of the heat regenerator is connected to the input pipeline. And a bypass control valve is arranged on the bypass pipeline. When the load suddenly rises, the bypass control valve can be opened to feed part of the low-temperature first heat exchange medium into the heat regenerator, the high-temperature first heat exchange medium is pre-cooled, the pre-pumping super-cooling value of the fluorine pump is increased, and the problem that the fluorine pump is shut down due to cavitation is avoided.

Description

Technical Field

[0001] The present application belongs to the technical field of fluorine pump air conditioners, and more specifically, to a fluorine pump air conditioner and a control method thereof. Background Art

[0002] Fluorine pump air conditioner is an air conditioning system that uses Freon as the working medium. The fluorine pump drives the circulation of Freon in the system to achieve the effect of cooling or heating. Compared with the traditional compressor-driven air conditioning system, the fluorine pump air conditioner has a higher energy efficiency ratio and less noise, and is especially suitable for occasions such as hospitals and libraries that require low-noise operation.

[0003] When the terminal load of the fluorine pump air conditioner suddenly increases in a short period of time, the compressor in the fluorine pump air conditioner runs at full load. If the subcooling value of the heat exchange medium located upstream of the fluorine pump is still low at this time, there is no other effective means in the system to quickly increase the subcooling value of the heat exchange medium, and the temperature control regulation of the entire system has a certain hysteresis. In order to avoid cavitation problems in the fluorine pump, the fluorine pump air conditioner can only be shut down and alarmed, resulting in a continuous increase in the terminal temperature, which will also affect the normal operation of other temperature control devices. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a fluorine pump air conditioner and a control method thereof, so as to solve the shutdown problem existing in the prior art that is easily caused by a low supercooling value before the pump when the terminal load suddenly increases.

[0005] To achieve the above-mentioned objectives, in a first aspect, the present application provides a fluorine pump air conditioner, comprising a first circulation component and a heat exchanger; the first circulation component comprises an evaporator, a fluorine pump and a heat regenerator, the heat regenerator having a first heat regeneration channel and a second heat regeneration channel capable of exchanging heat with each other, an input pipeline is connected between the output end of the fluorine pump and the input end of the evaporator, the output end of the evaporator is connected to an output pipeline, the output pipeline is connected to the input end of the first heat regeneration channel, the heat exchanger has a first heat exchange channel, the output end of the first heat exchange channel is connected to the input end of the first heat exchange channel, and the output end of the first heat exchange channel is connected to the input end of the fluorine pump; a bypass pipeline is connected between the output end of the fluorine pump and the input end of the second heat regeneration channel, the output end of the second heat regeneration channel is connected to the input pipeline, and a bypass control valve is connected to the bypass pipeline.

[0006] In some embodiments of the first aspect, the first circulation component further includes a pressure sensor and a temperature sensor, and the pressure sensor and the temperature sensor are both arranged upstream of the fluorine pump, and are used to obtain the pre-pump pressure value and pre-pump temperature value of the fluorine pump, respectively.

[0007] In some embodiments of the first aspect, the first circulation component also includes a one-way valve and a liquid storage tank, the one-way valve is connected between the output end of the second heat recovery channel and the output pipeline; the output end of the first heat exchange channel is connected to the output end of the liquid storage tank, and the output end of the liquid storage tank is connected to the input end of the fluorine pump.

[0008] In some embodiments of the first aspect, the fluorine pump air conditioner also includes a second circulation component, which includes: a compressor, a first condenser and a throttling device, the output end of the compressor is connected to the input end of the first condenser, the output end of the first condenser is connected to the input end of the throttling device, the heat exchanger also has a second heat exchange channel that exchanges heat with the first heat exchange channel, the output end of the throttling device is connected to the input end of the second heat exchange channel, and the output end of the second heat exchange channel is connected to the input end of the compressor.

[0009] In some embodiments of the first aspect, the first circulation component also includes a second condenser, which is arranged side by side with the first condenser and is located upstream of the first condenser; a first branch pipeline is connected between the output pipeline and the input end of the second condenser, and a first control valve is provided on the first branch pipeline, and the output end of the second condenser is connected to the first input end of the regenerator; a second branch pipeline is connected between the output pipeline and the input end of the first heat recovery channel, and a second control valve is provided on the second branch pipeline.

[0010] In some embodiments of the first aspect, a liquid pipe ball valve is provided on a side of the input pipeline close to the evaporator; and a gas pipe ball valve is provided on a side of the output pipeline close to the evaporator.

[0011] In a second aspect, the present application provides a control method for a fluorine pump air conditioner, the fluorine pump air conditioner comprising a first circulation component and a heat exchanger, the first circulation component comprising a fluorine pump and a regenerator, the input end of the fluorine pump being connected to the output end of a first regenerative channel of the regenerator, the output end of the fluorine pump being connected to the input end of a second regenerative channel of the regenerator through a bypass pipeline, a bypass control valve being provided on the bypass pipeline, the control method comprising:

[0012] Real-time acquisition of the pre-pump subcooling value of the fluorine pump;

[0013] When the pre-pump subcooling value is less than or equal to the subcooling determination value, the bypass control valve is opened.

[0014] In some embodiments of the second aspect, the fluorine pump air conditioner further includes a second circulation component, the first circulation component and the second circulation component exchange heat through the heat exchanger, and the second circulation component includes a compressor;

[0015] The control method further includes: when the pre-pump subcooling value is less than or equal to the subcooling determination value and the bypass control valve is in an open state, unlocking the operating frequency limit of the compressor and increasing the operating frequency of the compressor.

[0016] In some embodiments of the second aspect, the control method further includes:

[0017] When the pre-pump supercooling value is greater than the supercooling protection stop value, the operating frequency of the compressor is reduced, and the maximum operating frequency of the compressor is limited to the locking frequency; the supercooling protection stop value is greater than the supercooling judgment value.

[0018] In some embodiments of the second aspect, the control method further includes:

[0019] When the supercooling value before the pump is greater than the supercooling protection stop value, the bypass control valve is closed.

[0020] The beneficial effects of the fluorine pump air conditioner and the control method thereof provided in the present application are as follows: during normal operation, the fluorine pump delivers the first heat exchange medium in a low-temperature state in the liquid storage tank into the evaporator through an input pipeline, and utilizes the evaporator to exchange heat with the indoor room to achieve the purpose of cooling the indoor room. The first heat exchange medium heated by heat exchange in the evaporator is delivered to the heat exchanger through an output pipeline, and the heat exchanger is used to cool the first heat exchange medium to a low-temperature state, and the first heat exchange medium in a low-temperature state flows back to the liquid storage tank again. The present application adds a regenerator in front of the heat exchanger and adds a bypass line to the regenerator after the fluorine pump. In this way, when the pre-pump subcooling value of the fluorine pump is low, the bypass control valve of the bypass line can be opened to allow part of the first heat exchange medium in a low-temperature state to flow into the regenerator before entering the evaporator, and exchange heat with the first heat exchange medium in a high-temperature state output from the evaporator in the regenerator, thereby pre-cooling the first heat exchange medium in a high-temperature state, thereby increasing the pre-pump subcooling value of the fluorine pump, making it less likely for the first heat exchange medium to produce flash gas and cause cavitation of the fluorine pump. In addition, by pre-cooling the first heat exchange medium, the temperature of the first heat exchange medium at the evaporator inlet is lower, thereby lowering the evaporation temperature of the evaporator, thereby improving the heat exchange effect of the evaporator, ensuring the cooling effect of the evaporator on the indoor room, and improving the stability of indoor temperature control. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 This is a schematic diagram of the structure of a fluorine pump air conditioner in an exemplary embodiment of the present application;

[0023] Figure 2 This is a flow chart of a control method of a fluorine pump air conditioner in an exemplary embodiment of the present application;

[0024] Figure 3 It is a logic diagram of a control method of a fluorine pump air conditioner in an exemplary embodiment of the present application.

[0025] Among them, the reference numerals in the figure are:

[0026] 1-Fluorine pump; 11-input pipeline; 111-liquid pipe ball valve; 12-bypass pipeline; 121-bypass control valve; 13-pressure sensor; 14-temperature sensor; 2-regenerator; 21-check valve; 3-liquid storage tank; 4-heat exchanger; 5-evaporator; 51-output pipeline; 511-tracheal ball valve; 52-first branch pipeline; 521-first control valve; 53-second branch pipeline; 531-second control valve; 6-compressor; 7-expansion valve; 8-first condenser; 9-second condenser. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In the first aspect, the present application provides a fluorine pump air conditioner, referring to Figure 1 The fluorine pump air conditioner includes a first circulation component and a heat exchanger 4. The first circulation component includes a fluorine pump 1, a liquid storage tank 3, a regenerator 2 and an evaporator 5. The regenerator 2 has a first heat regeneration channel and a second heat regeneration channel that can exchange heat with each other. An input pipeline 11 is connected between the output end of the fluorine pump 1 and the input end of the evaporator 5. The output end of the evaporator 5 is connected to an output pipeline 51, and the output pipeline 51 is connected to the input end of the first heat regeneration channel. The heat exchanger 4 has a first heat exchange channel, the output end of the first heat regeneration channel is connected to the input end of the first heat exchange channel, the output end of the first heat exchange channel is connected to the input end of the liquid storage tank 3, the output end of the liquid storage tank 3 is connected to the input end of the fluorine pump 1, a bypass pipeline 12 is connected between the output end of the fluorine pump 1 and the input end of the second heat regeneration channel, the second output end of the second heat regeneration channel is connected to the input pipeline 11, and a bypass control valve 121 is connected to the bypass pipeline 12. Among them, the first heat exchange medium can be Freon.

[0032] Specifically, the fluorine pump 1 is used to suck the first heat exchange medium from its input end, and then output the first heat exchange medium from its output end at a certain pressure, so that the first heat exchange medium can overcome the system resistance and circulate between the components. The liquid storage tank 3 is used to store the first heat exchange medium in a low-temperature state. The output end of the liquid storage tank 3 and the input end of the fluorine pump 1 can be connected by pipe fittings. The fluorine pump 1 can extract a corresponding amount of the first heat exchange medium from the liquid storage tank 3 according to the pressure requirement. The output end of the fluorine pump 1 is connected to the input end of the evaporator 5 by pipe fittings, so that the fluorine pump 1 can deliver the first heat exchange medium into the evaporator 5 to dissipate heat and cool the room.

[0033] The input pipeline 11, the output pipeline 51 and the bypass pipeline 12 are all fluid conveying components connected by one or more conveying pipelines. Among them, the output end of the fluorine pump 1 can be connected to a three-way joint, and the same side of the input pipeline 11 and the bypass pipeline 12 is connected in parallel to the output end of the fluorine pump 1 through the three-way joint. The bypass control valve 121 can be connected between the two conveying pipelines in the bypass pipeline 12 to control the on and off of the bypass pipeline 12.

[0034] The regenerator 2 has a first heat regeneration channel for the first heat exchange medium that has absorbed heat and heated up, and a second heat regeneration channel for the first heat exchange medium in a low-temperature state. The second heat regeneration channel can be spirally wrapped around the circumference of the first heat regeneration channel to increase the contact area between the first heat regeneration channel and the second heat regeneration channel, so that the high-temperature first heat exchange medium and the low-temperature heat exchange medium can exchange heat with each other.

[0035] The evaporator 5 is used to be arranged indoors, and lowers the temperature of the indoor environment by absorbing indoor heat. The output end of the evaporator 5 is connected to the input end of the first heat recovery channel through the output pipeline 51, so that the first heat exchange medium output from the evaporator 5 can flow into the first heat recovery channel of the regenerator 2. The side of the bypass pipeline 12 facing away from the fluorine pump 1 is connected to the input end of the second heat recovery channel. When the bypass control valve 121 is in an open state, the first heat exchange medium can flow into the second heat recovery channel of the regenerator 2 through the bypass pipeline 12. The output end of the second heat recovery channel can be connected to the input pipeline 11 by a pipe fitting. For example, a three-way joint is provided on the side of the input pipeline 11 close to the evaporator 5, and the output end of the second heat recovery channel is connected to the three-way joint by a pipe fitting, so that the first heat exchange medium can be merged into the first input pipeline 11 from the output end of the second heat recovery channel, and transported to the evaporator 5 by the input pipeline 11.

[0036] The heat exchanger 4 is used to transfer and exchange heat. The heat exchanger 4 has a first heat exchange channel for the first heat exchange medium in a high temperature state to flow. The input end of the first heat exchange channel is connected to the output end of the second heat return channel by a pipe fitting, so that the first heat exchange medium can flow into the heat exchanger 4 from the output end of the second heat return channel. The output end of the first heat exchange channel is connected to the input end of the liquid storage tank 3 by a pipe fitting, so that the first heat exchange medium can flow into the liquid storage tank 3 from the output end of the first heat exchange channel.

[0037] During normal operation, the bypass control valve 121 is in a closed state. The first heat exchange medium in the liquid storage tank 3 is driven by the fluorine pump 1 and is transported to the evaporator 5 through the input pipe 11. The evaporator 5 exchanges heat with the indoor environment to achieve the purpose of heat dissipation and cooling. The first heat exchange medium, which has been heated by heat exchange, enters the heat exchanger 4 through the output pipe 51 and the first heat regeneration channel of the regenerator 2. It exchanges heat with other heat exchange mediums in the heat exchanger 4, and the first heat exchange medium is cooled by the heat exchanger 4. The first heat exchange medium, which has been cooled in the heat exchanger 4, flows back into the liquid storage tank 3 for storage, thereby realizing the circulation of the first heat exchange medium between the liquid storage tank 3, the fluorine pump 1, the evaporator 5, and the heat exchanger 4.

[0038] When the pre-pump subcooling value is low, the bypass control valve 121 can be opened to connect the bypass pipeline 12 with the regenerator 2, and part of the first heat exchange medium output from the fluorine pump 1 will flow into the second heat regeneration channel of the regenerator 2 through the bypass pipeline 12, so that the first heat exchange medium in a low temperature state exchanges heat with the first heat exchange medium in the first heat regeneration channel after being heated, so as to pre-cool the first heat exchange medium before entering the heat exchanger 4, thereby improving the cooling effect of the heat exchanger 4 on the first heat exchange medium, and further improving the pre-pump subcooling value of the first heat exchange medium before the fluorine pump 1. The first heat exchange medium output from the output end of the second heat regeneration channel will flow into the input pipeline 11 and enter the evaporator 5 to participate in the heat dissipation and cooling work.

[0039] By setting up the regenerator 2, when the supercooling value before the pump is low, part of the low-temperature first heat exchange medium is input into the second heat regeneration channel of the regenerator 2, and heat is exchanged with the first heat exchange medium in a high-temperature state output from the evaporator 5, so as to increase the supercooling value before the pump. When the load on one side of the evaporator 5 suddenly increases, the supercooling value before the pump can be kept high, so that the first heat exchange medium is not easy to produce flash gas and cause cavitation of the fluorine pump. In addition, by pre-cooling the first heat exchange medium, the temperature of the first heat exchange medium at the inlet of the evaporator is lower, thereby making the evaporation temperature of the evaporator lower, thereby improving the heat exchange effect of the evaporator, improving the stability of indoor temperature control, and avoiding shutdown problems.

[0040] In some embodiments, the bypass control valve 121 can be a solenoid valve, and the fluorine pump air conditioner also includes a controller, which can be a host computer. The solenoid valve is connected to the host computer to transmit communication signals. When the supercooling value before the pump is lower than a preset value, the controller controls the bypass control valve 121 to open automatically, and when the supercooling value before the pump is higher than a preset value, the controller controls the bypass control valve 121 to close automatically.

[0041] In some embodiments, the first circulation component also includes a pressure sensor 13 and a temperature sensor 14, and the pressure sensor 13 and the temperature sensor 14 are both arranged upstream of the fluorine pump 1. Specifically, the pressure sensor 13 and the temperature sensor 14 can be arranged between the fluorine pump 1 and the liquid storage tank 3, the pressure sensor 13 is used to obtain the pre-pump pressure value of the fluorine pump 1, and the temperature sensor 14 is used to obtain the pre-pump temperature value of the fluorine pump 1, so as to calculate the pre-pump supercooling value of the fluorine pump 1 by using the pre-pump pressure value and the pre-pump temperature value, wherein the pre-pump supercooling value can be calculated according to the calculation method of the prior art. In addition, the pressure sensor 13 and the temperature sensor can also be connected to the controller of the fluorine pump air conditioner, and after obtaining the pre-pump pressure value and the pre-pump temperature value by the controller, the pre-pump supercooling value is generated, and the bypass control valve is controlled according to the size of the pre-pump supercooling value.

[0042] In some embodiments, the first circulation component further includes a one-way valve 21, which is connected between the output end of the second heat regeneration channel and the output pipeline 51, and is used to limit the first heat exchange medium from the output pipeline 51 to flow to the regenerator 2. The first heat exchange medium in the output pipeline 51 is prevented from flowing back from the output end of the second heat regeneration channel to the bypass pipeline 12 in the reverse direction, so as to ensure that the first heat exchange medium flows stably into the evaporator 5.

[0043] In some embodiments, the fluorine pump air conditioner further includes a second circulation component, which includes: a compressor 6, a first condenser 8 and a throttling device, the output end of the compressor 6 is connected to the input end of the first condenser 8, the output end of the first condenser 8 is connected to the input end of the throttling device, the output end of the throttling device is connected to the input end of the second heat exchange channel, and the output end of the second heat exchange channel is connected to the input end of the compressor 6, so that the second heat exchange medium circulates between the compressor 6, the first condenser 8, the throttling device and the heat exchanger 4. The second heat exchange medium can also be Freon.

[0044] Specifically, the heat exchanger 4 also has a second heat exchange channel for the flow of the second heat exchange medium, wherein the flow directions of the first heat exchange medium and the second heat exchange medium in the heat exchange device can be opposite to increase the heat exchange efficiency of the first heat exchange medium and the second heat exchange medium. For example, the first input end and the second output end are located on the lower side of the heat exchange device, and the first output end and the second input end are located on the upper side of the heat exchange device.

[0045] The compressor 6 is used to drive the second heat exchange medium to flow under a certain pressure, and the input end of the compressor 6 is connected to the output end of the second heat exchange channel of the heat exchanger through a pipe. The first condenser 8 is a heat exchange device that can condense steam by lowering the steam temperature. The output end of the compressor 6 is connected to the input end of the first condenser 8 through a pipe, so that the second heat exchange medium can enter the first condenser 8 under the transportation of the compressor 6, and the first condenser 8 is used to condense and cool the first heat exchange medium.

[0046] The throttling device is used to adjust the pressure of the second heat exchange medium, and to cool the second heat exchange medium by pressurizing the second heat exchange medium. Exemplarily, the throttling device is an expansion valve 7, and the input end of the expansion valve 7 is connected to the output end of the first condenser 8 by a pipe fitting, so that the second heat exchange medium can flow into the expansion valve 7. The output end of the expansion valve 7 is connected to the input end of the second heat exchange channel of the heat exchanger by a pipe fitting, so that the second heat exchange medium enters the second heat exchange channel of the heat exchanger 4 again after being pressurized and cooled by the expansion valve 7.

[0047] When the compressor 6 is working, the second heat exchange medium is driven to circulate between the first condenser 8, the expansion valve 7 and the heat exchanger 4. After cooling down through the first condenser 8 and the expansion valve 7, the second heat exchange medium in a low temperature state will exchange heat with the first heat exchange medium in a high temperature state in the heat exchanger 4 to achieve heat dissipation and cooling of the first heat exchange medium. After absorbing heat and heating up, the second heat exchange medium flows out from the output end of the second heat exchange channel, and is transported by the compressor 6 again to enter the first condenser 8. The first condenser 8 is used to preliminarily cool down the second heat exchange medium in a high temperature state. When the second heat exchange medium after the preliminarily cooling down passes through the expansion valve 7 again, the second heat exchange medium is pressurized and cooled down to a low temperature state through the expansion valve 7.

[0048] In some embodiments, the first circulation component further includes a second condenser 9, which is arranged side by side with the first condenser 8 and is located upstream of the first condenser 8. In this way, the first condenser 8 and the second condenser 9 can share a fan device, which is more compact and has a lower cost. A first branch pipeline 52 is connected between the output pipeline 51 and the input end of the second condenser 9, and a first control valve 521 is provided on the first branch pipeline 52. The output end of the second condenser 9 is connected to the input end of the first heat recovery channel; a second branch pipeline 53 is connected between the output pipeline 51 and the input end of the heat regenerator 2, and a second control valve 531 is provided on the second branch pipeline 53.

[0049] Specifically, the first branch pipeline 52 and the second branch pipeline 53 are both fluid conveying components formed by connecting a plurality of conveying pipelines. A three-way joint may be provided on the side of the output pipeline 51 facing away from the evaporator 5. The first branch pipeline 52 and the second branch pipeline 53 are arranged in parallel with the output pipeline 51 through the three-way joint. The first branch pipeline 52 is connected between the output pipeline 51 and the evaporator 5. When the first control valve 521 is opened, the first heat exchange medium can flow into the second condenser 9 through the first branch pipeline 52. And the output end of the second condenser 9 can be connected to the second branch pipeline 53 through a pipe fitting so that it can be connected to the input end of the first heat regeneration channel, and flow into the first heat regeneration channel of the regenerator 2 after passing through the second condenser 9. The second branch pipeline 53 is connected between the output pipeline 51 and the input end of the first heat regeneration channel. When the second control valve 531 is opened, the first heat exchange medium can flow directly into the regenerator 2 through the second branch pipeline 53. Among them, the second condenser 9 can be a natural cooling condenser.

[0050] When the load on the evaporator 5 side is low, the first control valve 521 can be opened, the second control valve 531 can be closed, and the operation of the compressor 6 can be turned off at the same time, so that the first heat exchange medium after being heated flows into the second condenser 9 after being output from the evaporator 5, and the second condenser 9 is used alone to cool the first heat exchange medium, thereby achieving low power consumption operation. When the load on the evaporator 5 side is high, the first control valve 521 can be closed, the second control valve 531 can be opened, and the operation of the compressor 6 can be turned on at the same time, so that the first heat exchange medium flows directly into the heat exchanger 4 after being output from the evaporator 5, and the heat exchanger 4 is used alone to cool the first heat exchange medium.

[0051] In addition, when the effect of cooling the first heat exchange medium by using the heat exchanger 4 alone is poor, the compressor 6 can be started after opening the first control valve 521 and the second control valve 531, so that the first heat exchange medium passes through the second condenser 9 and the heat exchanger 4 in sequence, and the first heat exchange medium is cooled by the second condenser 9 and the heat exchanger 4. In addition, when the second condenser 9 and the compressor 6 circuit work together, if the subcooling value before the fluorine pump 1 is still low, part of the low-temperature first heat exchange medium can be introduced into the regenerator 2 by opening the bypass control valve 121, and the first heat exchange medium is pre-cooled before entering the heat exchanger 4, so as to increase the subcooling value before the pump and reduce the evaporation temperature of the evaporator 5, so as to meet the requirements of the evaporator 5 under high load operation.

[0052] The opening or closing of the first control valve 521 and the second control valve 531 can be manually controlled by maintenance personnel, or electromagnetic valves can be used and the controller in the fluorine pump air conditioner can be automatically controlled according to the settings of the control program or the instructions of the maintenance personnel.

[0053] In some embodiments, a liquid pipe ball valve 111 is provided on one side of the input pipe 11 close to the evaporator 5. The liquid pipe ball valve 111 is used to adjust the refrigerant flow in the input pipe 11 to ensure that the evaporator 5 can efficiently perform heat exchange. The opening of the liquid pipe ball valve 111 can be manually or automatically adjusted according to the operating state and refrigeration demand of the fluorine pump air conditioner.

[0054] In some embodiments, a tracheal ball valve 511 is provided on one side of the output pipeline 51 close to the evaporator 5. The tracheal ball valve 511 is used to adjust the pressure in the evaporator 5. When the pressure in the evaporator 5 is too high, the tracheal ball valve 511 automatically opens to release part of the gas, thereby reducing the pressure; conversely, when the pressure in the evaporator 5 is too low, the tracheal ball valve 511 automatically closes to maintain the pressure in the evaporator 5 within a reasonable range.

[0055] In a second aspect, the present application provides a control method for a fluorine pump air conditioner, wherein the fluorine pump air conditioner is the fluorine pump air conditioner provided in the first aspect of the embodiment, such as Figure 2 As shown, the control method of the fluorine pump air conditioner includes:

[0056] Step 101, obtaining the pre-pump subcooling value of the fluorine pump 1 in real time;

[0057] Step 102: when the pre-pump subcooling value is less than or equal to the subcooling judgment value, the bypass control valve 121 is opened.

[0058] Specific, combined Figure 1 As shown, the pre-pump subcooling value refers to the difference between the temperature of the condensed water of the first heat exchange medium located upstream of the fluorine pump 1 at a certain pressure and the saturation temperature at the corresponding pressure. The pre-pump subcooling value of the fluorine pump 1 can be calculated by obtaining the pre-pump pressure value and the pre-pump temperature value through the pressure sensor 13 and the temperature sensor 14 disposed upstream of the fluorine pump 1.

[0059] The supercooling judgment value is a control parameter used to judge whether the supercooling value before the pump is within a safe range. The supercooling judgment value can be manually input into the control system of the fluorine pump air conditioner, or can be pre-set in the control system. In practical applications, the setting of the supercooling judgment value needs to consider factors such as the working efficiency, safe operating range and environmental conditions of the fluorine pump 1.

[0060] When the pre-pump subcooling value is lower than the supercooling judgment value, the pre-pump subcooling value of the fluorine pump is low, which makes the first heat exchange medium easy to produce flash gas and cause fluorine pump cavitation. At this time, the bypass control valve 121 can be opened to connect the fluorine pump 1 and the regenerator 2, so that part of the low-temperature first heat exchange medium enters the second regenerator channel of the regenerator 2, and exchanges heat with the high-temperature first heat exchange medium flowing in the first regenerator channel of the regenerator 2. The high-temperature first heat exchange medium is pre-heated before entering the heat exchanger 4, thereby increasing the pre-pump subcooling value. By precooling the first heat exchange medium, the temperature of the first heat exchange medium at the inlet of the evaporator is lower, thereby lowering the evaporation temperature of the evaporator, and improving the heat exchange effect of the evaporator. When the evaporator 5 side is running at high load, the indoor temperature is not easy to fluctuate, maintaining temperature stability, and avoiding shutdown problems caused by fluorine pump cavitation caused by sudden load increase.

[0061] In some embodiments, the control method of the fluorine pump air conditioner also includes step 103, when the pre-pump supercooling value is less than or equal to the supercooling judgment value and the bypass control valve 121 is in an open state, unlocking the operating frequency limit of the compressor 6 and increasing the operating frequency of the compressor 6.

[0062] Specifically, the operating frequency limit of the compressor 6 means setting an upper limit value for the operating frequency of the variable frequency compressor 6 under normal operation. Since the variable frequency compressor 6 can automatically increase the operating frequency as the load increases, locking the upper limit of the frequency of the compressor 6 can prevent the compressor 6 from being damaged by overheating due to long-term high frequency operation under high load.

[0063] After opening the bypass control valve 121, if the subcooling value before the pump is still less than or equal to the subcooling judgment value, the restriction on the operating frequency of the compressor 6 can be temporarily unlocked, allowing the compressor 6 to operate at a higher frequency, thereby increasing the pressure and flow rate of the second heat exchange medium, thereby accelerating the temperature of the first heat exchange medium at the inlet of the heat exchanger 4 and further increasing the subcooling value before the pump.

[0064] It should be noted that when the pre-pump subcooling value is less than or equal to the subcooling determination value, the opening of the bypass control valve 121 and the limitation of the operating frequency of the compressor 6 can be performed step by step. Figure 3 As shown: when the pre-pump supercooling value is less than or equal to the supercooling judgment value, it is determined whether the bypass control valve 121 is open; if the bypass control valve 121 is in a closed state, the bypass control valve 121 is opened; if the bypass control valve 121 is in an open state, it is determined whether to unlock the operating frequency limit of the compressor 6, and when the operating frequency limit of the compressor 6 is not unlocked, after unlocking the operating frequency limit of the compressor 6, the operating frequency of the compressor 6 is increased.

[0065] In addition, if the pre-pump supercooling value is still less than or equal to the supercooling judgment value after unlocking the operating frequency limit of the compressor 6 and increasing the operating frequency of the compressor 6, an alarm action can be executed. For example, an audible and visual alarm signal is sent to the maintenance personnel, and the entire fluorine pump air conditioner is controlled to shut down, so that the maintenance personnel can perform maintenance work in time to avoid malfunction of the fluorine pump air conditioner.

[0066] In some embodiments, the control method of the fluorine pump air conditioner also includes step 104, when the supercooling value before the pump is greater than the supercooling protection stop value, reducing the operating frequency of the compressor 6 and locking the upper limit of the operating frequency of the compressor 6; wherein the supercooling protection stop value is greater than the supercooling judgment value.

[0067] Specifically, the supercooling protection stop value is a control parameter for judging whether the pre-pump supercooling value has recovered to a safe range, which can be manually input into the control system of the fluorine pump air conditioner or pre-set in the control system. When the pre-pump supercooling value is greater than the supercooling protection stop value, it indicates that the pre-pump supercooling has recovered to a normal state. At this time, the operating frequency of the compressor 6 can be reduced, and the upper limit of the operating frequency of the compressor 6 can be re-locked to avoid overheating damage caused by long-term high-frequency operation of the compressor 6, and also reduce the operating energy consumption of the fluorine pump air conditioner.

[0068] Among them, the overcooling protection stop value should be greater than the overcooling judgment value, so that the overcooling degree before the pump can be restored to a higher level before the overcooling protection action is turned off to ensure the stability of the fluorine pump air conditioner's indoor temperature control.

[0069] In some embodiments, the control method of the fluorine pump air conditioner further includes step 105, when the supercooling value before the pump is greater than the supercooling protection stop value, closing the bypass control valve 121.

[0070] When the supercooling value before the pump is greater than the supercooling protection stop value, if the bypass control valve 121 is in the open state, the bypass control valve 121 can be closed to disconnect the connection between the fluorine pump 1 and the regenerator 2, so that the first heat exchange medium can be normally transported from the fluorine pump 1 to the evaporator 5 side.

[0071] It should be noted that when the pre-pump supercooling value is greater than the supercooling protection stop value, closing the bypass control valve 121 and reducing the operating frequency of the compressor 6 can be performed step by step, for example Figure 3 As shown: when the pre-pump supercooling value is greater than the supercooling judgment value, and its pre-pump supercooling value is greater than the supercooling protection stop value, it is determined whether the compressor 6 is unlocked from the operating frequency limit; when the compressor 6 is in the unlocked operating frequency limit, the operating frequency of the compressor 6 is reduced, and the upper limit of the operating frequency of the compressor 6 is locked; when the compressor 6 is not in the unlocked operating frequency limit, it is determined whether the bypass control valve 121 is open, and when the bypass control valve 121 is in the open state, the bypass control valve 121 is closed.

[0072] In summary, by obtaining and updating the pre-pump subcooling value in real time, when the subcooling value is low, the bypass control valve 121 is opened in time or the operating frequency of the compressor 6 is increased to meet the demand when the load on one side of the evaporator 5 suddenly increases, thereby improving the stability of the fluorine pump air conditioner in controlling the indoor temperature. After the subcooling value returns to normal, the bypass control valve 121 is closed in time or the operating frequency of the compressor 6 is reduced to reduce the energy consumption of the fluorine pump air conditioner.

[0073] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A fluorine pump air conditioner, characterized in that: including a first circulation component and a heat exchanger; The first circulation component includes an evaporator, a fluorine pump and a regenerator, the regenerator has a first heat regeneration channel and a second heat regeneration channel that can exchange heat with each other, an input pipeline is connected between the output end of the fluorine pump and the input end of the evaporator, the output end of the evaporator is connected to an output pipeline, the output pipeline is connected to the input end of the first heat regeneration channel, the heat exchanger has a first heat exchange channel, the output end of the first heat regeneration channel is connected to the input end of the first heat exchange channel, and the output end of the first heat exchange channel is connected to the input end of the fluorine pump; A bypass pipeline is connected between the output end of the fluorine pump and the input end of the second heat regeneration channel, the output end of the second heat regeneration channel is connected to the input pipeline, and a bypass control valve is connected to the bypass pipeline.

2. The fluorine pump air conditioner according to claim 1, characterized in that: The first circulation component also includes a pressure sensor and a temperature sensor. The pressure sensor and the temperature sensor are both arranged upstream of the fluorine pump and are used to obtain the pre-pump pressure value and pre-pump temperature value of the fluorine pump respectively.

3. The fluorine pump air conditioner according to claim 1, characterized in that: The first circulation component also includes a one-way valve and a liquid storage tank, the one-way valve is connected between the output end of the second heat recovery channel and the output pipeline; the output end of the first heat exchange channel is connected to the output end of the liquid storage tank, and the output end of the liquid storage tank is connected to the input end of the fluorine pump.

4. The fluorine pump air conditioner according to claim 1, characterized in that: The fluorine pump air conditioner also includes a second circulation component, which includes: a compressor, a first condenser and a throttling device, the output end of the compressor is connected to the input end of the first condenser, the output end of the first condenser is connected to the input end of the throttling device, the heat exchanger also has a second heat exchange channel that exchanges heat with the first heat exchange channel, the output end of the throttling device is connected to the input end of the second heat exchange channel, and the output end of the second heat exchange channel is connected to the input end of the compressor.

5. The fluorine pump air conditioner according to claim 4, characterized in that: The first circulation assembly further includes a second condenser, the second condenser being arranged side by side with the first condenser, and the second condenser being located upstream of the first condenser; A first branch pipeline is connected between the output pipeline and the input end of the second condenser, and a first control valve is arranged on the first branch pipeline. The output end of the second condenser is connected to the first input end of the regenerator; a second branch pipeline is connected between the output pipeline and the input end of the first heat recovery channel, and a second control valve is arranged on the second branch pipeline.

6. The fluorine pump air conditioner according to any one of claims 1 to 5, characterized in that: A liquid pipe ball valve is arranged on a side of the input pipeline close to the evaporator; and a gas pipe ball valve is arranged on a side of the output pipeline close to the evaporator.

7. A control method for a fluorine pump air conditioner, characterized in that: The fluorine pump air conditioner comprises a first circulation component and a heat exchanger, wherein the first circulation component comprises a fluorine pump and a regenerator, wherein the input end of the fluorine pump is connected to the output end of the first regenerator channel of the regenerator, and the output end of the fluorine pump is connected to the input end of the second regenerator channel of the regenerator through a bypass pipeline, wherein a bypass control valve is provided on the bypass pipeline, and the control method comprises: Real-time acquisition of the pre-pump subcooling value of the fluorine pump; When the pre-pump subcooling value is less than or equal to the subcooling determination value, the bypass control valve is opened.

8. The control method of the fluorine pump air conditioner according to claim 7, characterized in that: The fluorine pump air conditioner also includes a second circulation component, the first circulation component and the second circulation component exchange heat through the heat exchanger, and the second circulation component includes a compressor; The control method further includes: when the pre-pump subcooling value is less than or equal to the subcooling determination value and the bypass control valve is in an open state, unlocking the operating frequency limit of the compressor and increasing the operating frequency of the compressor.

9. The control method of the fluorine pump air conditioner according to claim 8, characterized in that: The control method further comprises: When the pre-pump supercooling value is greater than the supercooling protection stop value, the operating frequency of the compressor is reduced, and the maximum operating frequency of the compressor is limited to the locking frequency; the supercooling protection stop value is greater than the supercooling judgment value.

10. The control method of the fluorine pump air conditioner according to claim 8 or 9, characterized in that: The control method further comprises: When the supercooling value before the pump is greater than the supercooling protection stop value, the bypass control valve is closed.

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