A refrigeration system having a refrigerant redundancy adjustment function

Abstract

The application provides a refrigeration system with a refrigerant redundancy adjustment function, comprising a compressor, a liquid storage tank, a condenser, a first pipeline, a second pipeline and a pressure tapping pipe, one end of the first pipeline is communicated with the condenser, the other end is communicated with the inside of the liquid storage tank, liquid refrigerant in the liquid storage tank can be discharged to the second pipeline, one end of the pressure tapping pipe can introduce gas with the exhaust pressure of the compressor, the other end can introduce the gas into the liquid storage tank, the size of the exhaust pressure introduced through the pressure tapping pipe can control the change of the liquid height of the liquid storage tank, the higher the exhaust pressure of the compressor, the lower the liquid discharge height, the lower the exhaust pressure of the compressor, the higher the liquid discharge height. According to the application, enough refrigerant amount can be ensured to participate in the refrigeration cycle of the system under high frequency operation, less refrigerant amount can enter the system to participate in the cycle under low frequency operation, and the problem of refrigerant redundancy caused by the difference of the required refrigerant filling amount under different operation conditions of the fluorine pump compression refrigeration system is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigeration technology, in particular to a refrigeration system with refrigerant redundancy adjustment function. BACKGROUND

[0002] With the large application of 4G and the gradual popularization of 5G, the heat dissipation of various data processing equipment is getting larger and larger, and the data center has higher and higher requirements for the refrigerating capacity and energy saving of air conditioning equipment.

[0003] Using the outdoor natural cold source in the transition season and cold winter to cool the data center can greatly reduce the operating cost of the air conditioning equipment. Commonly, a fluorine pump air conditioner is used, and in winter, the fluorine pump mode is started and the operation of the compressor is stopped to realize heat pipe refrigeration operation by driving the refrigerant, which greatly reduces the operating cost of the equipment.

[0004] The fluorine pump compression refrigeration system belongs to a composite system, and the fluorine pump heat pipe system and the compression refrigeration system share an evaporator and a condenser, as well as some shared refrigerant pipelines, system components, etc.

[0005] Because the heat load of the data center fluctuates with the user usage and seasonal time, more and more computer room air conditioners now use frequency conversion technology to cope with the heat load fluctuation of the data center to ensure the constant temperature and humidity demand of the data center. However, the change of the frequency of the compressor of the refrigeration system will cause the change of the optimal refrigerant circulation amount, and generally the higher the frequency, the greater the required refrigerant circulation amount. If the optimal refrigerant filling amount under 100% load is ensured during the design and development of the refrigeration system, the optimal refrigerant filling amount under 75% or 50% or other low frequency operation conditions is relatively small, so the refrigerant in the unit may accumulate under low frequency working conditions, and the accumulation of the refrigerant at the bottom of the heat exchanger is not conducive to heat exchange.

[0006] Because the compression refrigeration system in the prior art has the technical problem of refrigerant redundancy caused by the difference in the required refrigerant filling amount under different operating conditions, the present application designs a refrigeration system with refrigerant redundancy adjustment function. SUMMARY

[0007] Therefore, the technical problem to be solved by the present application is to overcome the defect of refrigerant redundancy caused by the difference in the required refrigerant filling amount under different operating conditions of the compression refrigeration system in the prior art, so as to provide a refrigeration system with refrigerant redundancy adjustment function.

[0008] In order to solve the above problems, the present application provides a refrigeration system with refrigerant redundancy adjustment function, which comprises:

[0009] The compressor, the liquid storage tank, the condenser, the first pipeline, the second pipeline and the pressure-taking pipe, one end of the first pipeline is communicated with the condenser, the other end is communicated with the inside of the liquid storage tank, so that the heat-exchanged refrigerant in the condenser can be introduced into the liquid storage tank, the liquid refrigerant in the liquid storage tank can be discharged to the second pipeline, one end of the pressure-taking pipe can introduce the gas with the exhaust pressure of the compressor, the other end can introduce the gas into the liquid storage tank, the exhaust pressure introduced through the pressure-taking pipe can control the change of the liquid level in the liquid storage tank, the higher the exhaust pressure of the compressor, the lower the liquid level in the liquid storage tank, and vice versa.

[0010] In some embodiments,

[0011] The liquid-taking part and the hose are further included, both of which are located in the inside of the liquid storage tank, the lower end of the liquid-taking part is communicated with one end of the second pipeline through the hose, the upper end of the liquid-taking part is located below or flush with the liquid level of the liquid storage tank, the liquid-taking part can introduce the liquid in the liquid storage tank and guide it out to the hose, and the height of the liquid-taking part changes with the change of the exhaust pressure of the compressor, the higher the exhaust pressure of the compressor, the lower the height of the liquid-taking part, and vice versa.

[0012] In some embodiments,

[0013] The gas pressure pipe and the piston are further included, the gas pressure pipe is arranged in the inside of the liquid storage tank, the piston is arranged in the inside of the gas pressure pipe, the piston divides the inside of the gas pressure pipe into an upper space and a lower space, the piston can move up and down in the gas pressure pipe, the other end of the pressure-taking pipe is communicated with the upper space of the gas pressure pipe, the lower space is communicated with the inside of the liquid storage tank, the liquid-taking part is connected with the piston to move with the up and down movement of the piston, so that different magnitudes of resultant force are applied to the piston under different exhaust pressures, the piston is driven to move to different heights, so that the liquid-taking part takes liquid at different heights to guide the liquid in the liquid storage tank out.

[0014] In some embodiments,

[0015] Further comprising an elastic structure arranged in the upper space or the lower space of the air pressure pipe, one end of the elastic structure being connected to the piston, the other end of the elastic structure being fixed; the higher the exhaust pressure of the compressor is, the lower the height reached by the downward movement of the piston is, at this time the length of the elastic structure elongated or compressed is longer, the elastic force f is greater, so that finally the piston reaches an equilibrium state, at the equilibrium state the liquid taking height of the liquid taking part is lower; on the contrary, the lower the exhaust pressure of the compressor is, the higher the height reached by the downward movement of the piston is, at this time the length of the elastic structure elongated or compressed is shorter, the elastic force f is smaller, so that finally the piston reaches an equilibrium state, at the equilibrium state the liquid taking height of the liquid taking part is higher.

[0016] In some embodiments,

[0017] The upper end of the air pressure pipe is fixed to the inner top end of the liquid storage tank, so that the upper space in the air pressure pipe forms a relative seal with the inner space of the liquid storage tank; the lower end of the air pressure pipe is spaced apart from the inner bottom end of the liquid storage tank by a preset distance, and the lower end of the air pressure pipe forms an opening to allow the liquid taking part to pass therethrough.

[0018] The upper end of the elastic structure is fixed to the inner top end of the liquid storage tank, and the lower end of the elastic structure is fixed to the upper end of the piston, forming a tension spring; or the upper end of the elastic structure is fixed to the lower end of the piston, and the lower end of the elastic structure is fixed to the opening of the air pressure pipe, forming a compression spring.

[0019] In some embodiments,

[0020] The liquid taking part is a floating ball which can float on the liquid surface in the liquid storage tank, and the floating ball is provided with a suction inlet to suck the liquid on the liquid surface into the interior of the floating ball and discharge the liquid through the hose;

[0021] Further comprising a sling, the upper end of the floating ball being connected to the lower end of the piston through the sling.

[0022] In some embodiments,

[0023] The liquid taking part has a channel passing through the interior thereof, and the liquid taking part has two or more ports, one of which is the suction inlet, and one of which is connected to one end of the hose.

[0024] The lower end of the air pressure pipe is a converging port, in the projection plane of the horizontal plane, the horizontal plane projection area of the liquid taking part is smaller than the projection area of the converging port, and the horizontal plane projection area of the piston is greater than the projection area of the converging port.

[0025] In some embodiments,

[0026] Still further comprising an evaporator and a throttle valve, one end of the second pipeline is in communication with the inside of the liquid storage tank, the other end is in communication with the evaporator, the throttle valve is arranged on the second pipeline to enable the refrigerant in the liquid storage tank to be exported to the throttle valve;

[0027] The top of the liquid storage tank is provided with an inlet and a pressure tapping, the inlet is located at a position opposite to the radial outer side of the gas pressure pipe, the other end of the first pipeline is in communication with the inlet to introduce refrigerant into the inside of the liquid storage tank, the pressure tapping is located at a position opposite to the inner wall of the gas pressure pipe, the other end of the pressure tapping pipe is in communication with the pressure tapping to introduce refrigerant into the inside of the gas pressure pipe.

[0028] In some embodiments,

[0029] The refrigeration system is a fluorine pump compression refrigeration system, further comprising a fluorine pump, a one-way valve A, a one-way valve B and a third pipeline, the one-way valve A is arranged on the second pipeline and can only allow fluid to flow out of the liquid storage tank to the second pipeline, one end of the third pipeline is in communication with the inner bottom of the liquid storage tank, the other end is in communication with a position between the one-way valve A and the throttle valve on the second pipeline, the fluorine pump is arranged on the third pipeline; the one-way valve B bypasses the compressor in parallel, the inlet and outlet of the one-way valve B are connected to the suction port and the exhaust port of the compressor respectively, and the flow direction of the one-way valve B is only allowed to point from the inlet of the compressor to the outlet of the compressor.

[0030] The bottom of the liquid storage tank is provided with a first liquid outlet and a second liquid outlet, the first liquid outlet is used to communicate the hose with the second pipeline, and the second liquid outlet is used to communicate the third pipeline with the inside of the liquid storage tank.

[0031] In some embodiments,

[0032] Further comprising an oil separator, the oil separator is arranged in communication between the exhaust port of the compressor and the condenser, one end of the pressure tapping pipe is connected between the gas outlet of the oil separator and the inlet of the condenser to obtain gas with exhaust pressure.

[0033] The refrigeration system provided by the application has the following beneficial effects:

[0034] 1. The present application can change the liquid level in the liquid storage tank with the change of the discharge pressure of the compressor, the higher the discharge pressure of the compressor, the lower the liquid level in the liquid storage tank (i.e. the lower the height of the liquid when discharged), and vice versa, the lower the discharge pressure of the compressor, the higher the liquid level in the liquid storage tank (i.e. the higher the height of the liquid when discharged), the higher the frequency of the compressor, the higher the discharge pressure, so that more refrigerant liquid in the liquid storage tank can be discharged at high frequency to participate in the system circulation, so as to ensure that there is enough refrigerant amount to participate in the refrigeration cycle of the system under high frequency operation, to ensure normal refrigeration or heating effect, and relatively less refrigerant liquid is discharged from the liquid storage tank at low frequency, so that less refrigerant amount enters the system to participate in the circulation under low frequency operation, avoiding too much refrigerant amount entering the system to cause the refrigerant to stay in the heat exchanger, affecting the heat exchange effect.

[0035] 2. The present application can drive and control the piston by using the pressure difference between the high-pressure discharge pressure of the compressor and the pressure of the refrigerant in the liquid storage tank and the spring force of the spring, and then adjust the height of the piston to change the height of the liquid ball in the lower part of the piston, so as to control the change of the liquid level in the liquid storage tank, effectively adjust the optimal refrigerant circulation amount under different working conditions, without increasing the control hardware and control software, and automatically balance the control by using the change of the discharge pressure of the compressor and the change of the spring force, which has high reliability and low cost; since the optimal refrigerant circulation amount can be ensured under different working conditions, there is no excessive refrigerant liquid to occupy the pipeline space of the heat exchanger, so that the heat exchanger can fully exert the heat exchange capacity, so that the energy efficiency of the refrigeration system is higher under low frequency operation, effectively solving the problem of refrigerant redundancy caused by the difference in the required refrigerant filling amount under different operating conditions of the fluorine pump compression refrigeration system, solving the problem of refrigerant liquid storage and release, and effectively solving the problem of liquid level control in the liquid storage tank. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is the system structure diagram of the refrigeration system with refrigerant redundancy adjustment function of the present application;

[0037] Figure 2 is Figure 1 the structure enlargement diagram of the liquid storage tank part in

[0038] The reference signs are as follows:

[0039] 1, compressor; 2, liquid storage tank; 3, condenser; 4, throttle valve; 5, evaporator; 6, liquid taking part; 7, gas pressure pipe; 8, piston; 9, elastic structure; 10, fluorine pump; 11, one-way valve A; 12, sling; 13, oil separator; 14, inner fan; 15, one-way valve B; 16, capillary tube; 17, outer fan; 18, inlet; 19, pressure taking port; 20, first liquid outlet; 21, second liquid outlet;

[0040] 101, first pipe; 102, second pipe; 103, third pipe; 104, pressure taking pipe; 201, hose. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one example embodiment is actually only illustrative, but not intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0042] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the example embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a reference to the presence of a feature, step, operation, device, component and / or combinations thereof.

[0043] Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in the various examples herein are not limiting of the scope of the application. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and not of limitation. The detailed description is divided into sections to facilitate better understanding. Unless otherwise expressly defined herein, all terms are to be given their broadest possible interpretation. The use of "including", "comprising" and "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Although the drawings represent embodiments of the application, the drawings are not necessarily to scale and certain features can have been exaggerated or minimized. The drawings are intended to provide a generalized overview of illustrative embodiments consistent with the application. Accordingly, to the extent that the figures might conflict with the detailed description below or be inconsistent with the spirit and scope of the application, the figures shall control. Except as otherwise indicated herein, the materials described herein are not limited to any particular generic class, unless clearly indicated otherwise.

[0044] In the description of the present application, it needs to be understood that the orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship is generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0045] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0046] In addition, it needs to be pointed out that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore, it cannot be understood as a limitation on the scope of protection of the present application.

[0047] As Figures 1-2 shown, the present application provides a refrigeration system with refrigerant redundancy adjustment function, which comprises:

[0048] The compressor 1, the liquid storage tank 2, the condenser 3, the first pipeline 101, the second pipeline 102 and the pressure-taking pipe 104, one end of the first pipeline 101 communicates with the condenser 3 and the other end communicates with the inside of the liquid storage tank 2, so that the refrigerant in the condenser 3 can be introduced into the liquid storage tank 2, the liquid refrigerant in the liquid storage tank 2 can be discharged to the second pipeline 102, one end of the pressure-taking pipe 104 can introduce the gas with the exhaust pressure of the compressor 1 (the gas with the exhaust pressure of the compressor refers to the gas introduced between the exhaust port of the compressor and the inlet of the condenser), the other end can introduce the gas into the liquid storage tank 2, the exhaust pressure introduced through the pressure-taking pipe 104 can control the change of the liquid level in the liquid storage tank 2, the higher the exhaust pressure of the compressor 1, the lower the liquid level in the liquid storage tank 2, and vice versa.

[0049] The present application can effectively adjust the optimal refrigerant circulation amount under different working conditions, without increasing the control hardware and control software, and automatically balance the control by using the change of the exhaust pressure of the compressor and the change of the spring force, so that the reliability is relatively high and the cost is relatively low; since the optimal refrigerant circulation amount can be ensured under different working conditions, the excessive refrigerant liquid does not occupy the pipeline space of the heat exchanger, so that the heat exchanger can fully exert the heat exchange capacity, so that the energy efficiency of the refrigeration system is higher when running at low frequency, the refrigerant redundancy problem caused by the difference of the required refrigerant filling amount under different working conditions of the fluorine pump compression refrigeration system is effectively solved, the problems of the storage and release of the refrigerant liquid are solved, and the control problem of the liquid level in the liquid storage tank is solved.

[0050] The present application can effectively adjust the optimal refrigerant circulation amount under different working conditions, without increasing the control hardware and control software, and automatically balance the control by using the change of the exhaust pressure of the compressor and the change of the spring force, so that the reliability is relatively high and the cost is relatively low; since the optimal refrigerant circulation amount can be ensured under different working conditions, the excessive refrigerant liquid does not occupy the pipeline space of the heat exchanger, so that the heat exchanger can fully exert the heat exchange capacity, so that the energy efficiency of the refrigeration system is higher when running at low frequency, the refrigerant redundancy problem caused by the difference of the required refrigerant filling amount under different working conditions of the fluorine pump compression refrigeration system is effectively solved, the problems of the storage and release of the refrigerant liquid are solved, and the control problem of the liquid level in the liquid storage tank is solved.

[0051] In some embodiments,

[0052] The liquid taking part 6 and the hose 201 are both located inside the liquid storage tank 2, the lower end of the liquid taking part 6 is communicated with one end of the second pipeline 102 through the hose 201, the upper end of the liquid taking part 6 is located below or flush with the liquid level of the liquid storage tank 2, the liquid taking part 6 can introduce the liquid in the liquid storage tank 2 and guide it to the hose 201, and the height of the liquid taking part 6 changes with the change of the exhaust pressure of the compressor 1, the higher the exhaust pressure of the compressor 1, the lower the height of the liquid taking part 6, and vice versa.

[0053] This is the preferred structure of the liquid storage tank inside the application, the refrigerant liquid in the liquid storage tank can be effectively guided out through the liquid taking part, the hose is used to connect the liquid taking part and transport the liquid to the second pipeline outside, and the hose of the application is preferably a telescopic structure and a flexible structure, which can continuously maintain the connection and communication with the liquid taking part as the liquid taking part rises or falls, and the height of the liquid taking part after rising or falling changes with the change of the exhaust pressure of the compressor, that is, the higher the exhaust pressure, the lower the height of the liquid taking part, and the lower the exhaust pressure, the higher the height of the liquid taking part, which can guide more refrigerant liquid to participate in the system circulation through the lower liquid taking part at high frequency, and guide less refrigerant liquid to participate in the system circulation through the higher liquid taking part at low frequency, ensuring that there is enough refrigerant amount to participate in the refrigeration cycle of the system at high frequency, and less refrigerant amount enters the system to participate in the circulation when the frequency of the compressor is low, avoiding the situation that too much refrigerant amount enters the system to cause the refrigerant to stay in the heat exchanger, solving the problem of refrigerant redundancy caused by the difference in the required refrigerant filling amount under different operating conditions of the fluorine pump compression refrigeration system.

[0054] The pressure taking pipe of the application is preferably a capillary structure. The liquid taking pipe assembly of the application preferably includes a hose and a liquid taking ball (liquid taking part 6), the liquid taking ball is fixedly arranged on the lower end surface of the piston; the liquid taking pipe assembly of the application preferably further includes a sling, the liquid taking ball is suspended on the outer surface (lower end surface) of the piston through the sling, the liquid taking ball can freely pass through the contraction port (open end) at the bottom of the air pressure pipe, the hose connects the liquid taking ball and the first liquid outlet, and the first liquid outlet is a port located at the bottom of the liquid storage tank inside.

[0055] In the working temperature range, the density of the liquid taking ball and the hose of the present application is preferably less than the density of the refrigerant liquid; further preferably, the length of the hose is long enough to keep the hose in a relaxed state when the piston is raised to the highest position, preventing tensile failure caused by the length of the hose being too short; further preferably, the liquid taking ball has a through channel, and the hose is connected to one of the ports of the through channel, and the other port of the through channel is used to receive the refrigerant liquid in the liquid storage tank; further preferably, when the piston is lowered to the lowest position and abuts against the constricted port at the bottom of the gas pressure pipe, the liquid taking ball is close to the bottom of the liquid storage tank (so that the refrigerant liquid inside the liquid storage tank can be discharged more thoroughly, and more refrigerant liquid can be obtained); further preferably, the sling and / or the hose are made of soft material and have flexible deformation function.

[0056] In some embodiments,

[0057] Further comprising a gas pressure pipe 7 arranged inside the liquid storage tank 2, and a piston 8 arranged inside the gas pressure pipe 7, the piston 8 divides the inside of the gas pressure pipe 7 into an upper space and a lower space, the piston 8 can move up and down in the gas pressure pipe 7, the other end of the pressure taking pipe 104 leads into the upper space of the gas pressure pipe 7, the lower space communicates with the inside of the liquid storage tank 2, and the liquid taking part 6 is connected with the piston 8 to move with the piston 8, so that different magnitudes of resultant force acting on the piston 8 at different exhaust pressures drive the piston 8 to move to different heights, so that the liquid taking part 6 takes liquid at different heights to discharge the liquid in the liquid storage tank 2.

[0058] This is a further preferred structure of the internal structure of the liquid storage tank of the present application, a space is separately divided and sealed in the internal space of the liquid storage tank by the gas pressure pipe, the piston is arranged inside the gas pressure pipe and moves up and down along the gas pressure pipe, the piston is connected with the liquid taking part to make the liquid taking part move up and down integrally with the piston, and the piston is driven by the pressure difference between the exhaust pressure entering the upper space through the pressure taking pipe and the pressure in the lower liquid storage tank and other forces, i.e. the piston is pressed to a lower height in the case of a larger exhaust pressure, so that the liquid taking part takes and discharges liquid at a lower position, so that more refrigerant liquid is discharged through the lower liquid taking part to participate in the system circulation in the case of high frequency operation (the higher the compressor exhaust pressure, the higher the frequency), and the piston is pressed to a higher height in the case of a smaller exhaust pressure (the lower the compressor exhaust pressure, the lower the frequency), so that the liquid taking part takes and discharges liquid at a higher position, so that less refrigerant enters the system to participate in the circulation in the case of low compressor frequency, solving the problem of refrigerant redundancy caused by the difference in the required refrigerant filling amount in different operating conditions of the fluorine pump compression refrigeration system.

[0059] In some embodiments,

[0060] Further comprising an elastic structure 9 arranged in the upper space or the lower space of the gas pressure pipe 7, one end of the elastic structure 9 being connected with the piston 8, the other end of the elastic structure 9 being fixed, so that the force acting on the piston 8 is F = P1 - P2 - f + G, wherein P1 is the exhaust pressure, i.e. the pressure in the upper space of the gas pressure pipe, P2 is the pressure outside the gas pressure pipe, i.e. the pressure inside the liquid storage tank, f is the elastic force of the elastic structure, and G is the gravity of the piston, other forces such as friction of the piston being ignored in the formula (the friction is the force generated when the piston and the inner wall of the gas pressure pipe move or are about to move relative to each other, which is opposite to the moving direction of the piston and is the force to prevent the piston from moving and to keep the piston in the existing position); the higher the exhaust pressure of the compressor 1 is, the lower the height reached by the downward movement of the piston 8 is, and at this time, the elastic structure 9 is elongated or compressed to a longer length, and the elastic force f is greater, so that the piston 8 finally reaches an equilibrium state, and at this time, the liquid taking height of the liquid taking part 6 is lower; on the contrary, the lower the exhaust pressure of the compressor 1 is, the higher the height reached by the downward movement of the piston 8 is, and at this time, the elastic structure 9 is elongated or compressed to a shorter length, and the elastic force f is smaller, so that the piston 8 finally reaches an equilibrium state, and at this time, the liquid taking height of the liquid taking part 6 is higher.

[0061] This is a further preferred structure of the present application, and the preferred structure in which the elastic structure is arranged in the upper space of the gas pressure pipe and connected with the upper end of the piston can provide an elastic pulling force preferably upward to the piston, so that in the case of a large exhaust pressure, the piston moves downward by a larger distance, thereby gradually increasing the elastic force f, and finally making the piston reach an equilibrium state, at which the liquid taking part is at a lower position to discharge liquid, so as to realize that more refrigerant liquid is discharged through the lower liquid taking part to participate in the system circulation in high-frequency operation, thereby meeting the refrigeration / heating demand in a large load or working condition; in the case of a small exhaust pressure, the piston moves downward by a smaller distance, and the elastic force f also makes the piston reach an equilibrium state, at which the liquid taking part is at a higher position to discharge liquid, so as to realize that less refrigerant liquid is discharged through the higher liquid taking part to participate in the system circulation in low-frequency operation, thereby effectively solving the problem of refrigerant redundancy caused by the difference in the required refrigerant filling amount in different operating conditions of the fluorine pump compression refrigeration system.

[0062] The application designs a gas pressure pipe with a spring (i.e. elastic structure 9) in the liquid storage tank, utilizes the pressure difference between the high-pressure exhaust pressure of the compressor and the pressure of the refrigerant in the liquid storage tank and the spring force of the spring to jointly drive and control the piston, and then adjusts the height of the piston to change the height of the liquid taking ball in the lower part of the piston, so as to control the height change of the liquid level in the liquid storage tank. The driving force F=P1-P2-f+G (wherein P1 is the exhaust pressure, i.e. the pressure inside the gas pressure pipe, P2 is the pressure outside the gas pressure pipe, i.e. the pressure inside the liquid storage tank, f is the spring force, and G is the gravity of the piston. The friction of the piston and other forces are ignored in the formula), the height of the piston is adjusted by the driving force F to change the height of the liquid taking ball in the lower part of the piston, so as to control the height change of the liquid level in the liquid storage tank.

[0063] The higher the frequency of the compressor is, the greater the exhaust pressure P1 is, and the pressure difference P1-P2 formed by the pressure P2 reaching the liquid storage tank is usually large, so that the spring pushes the piston to move downward. With the elongation of the spring, the driving force F gradually decreases, and then the piston reaches a balance position and no longer decreases. Conversely, when the exhaust pressure decreases, P1-P2 decreases, and the spring force generated by the elongated spring is large, so as to pull the piston to move upward. Therefore, the height of the liquid taking ball is usually negatively correlated with the frequency of the compressor, i.e. the higher the frequency of the compressor is, the lower the liquid taking ball is, the lower the liquid level in the liquid storage tank is, and the more the refrigerant participating in the system circulation is. The lower the frequency of the compressor is, the higher the liquid taking ball is, the higher the liquid level in the liquid storage tank is, and the less the refrigerant participating in the system circulation is.

[0064] Therefore, the application can realize the self-balancing control function of the liquid level in the liquid storage tank.

[0065] As shown in Figure 2 The embodiment two of the liquid storage tank of the application is different from the embodiment one shown in Figure 1 in that the setting position of the spring is different, and the rest of the structure is completely the same: Figure 1 The extension spring is arranged in the closed gas pressure chamber inside the gas pressure pipe, Figure 2 The compression spring is arranged between the outer side of the piston and the contraction port of the open port of the gas pressure pipe.

[0066] The liquid storage tanks in the embodiment one and the embodiment two are used to adjust the redundancy difference between different refrigerant circulation amounts under various operating conditions, i.e. the height of the refrigerant liquid surface in the liquid storage tank can continuously change to change the amount of refrigerant stored therein.

[0067] In some embodiments,

[0068] The upper end of the air pressure pipe 7 is fixed to the inner top end of the liquid storage tank 2, so that the upper space in the air pressure pipe 7 forms a relative seal with the inner space of the liquid storage tank 2; the lower end of the air pressure pipe 7 is spaced apart from the inner bottom end of the liquid storage tank 2 by a preset distance, and the lower end of the air pressure pipe 7 forms an opening to allow the liquid taking part 6 to pass through.

[0069] The upper end of the elastic structure 9 is fixed to the inner top end of the liquid storage tank 2, and the lower end is fixed to the upper end of the piston 8, forming a tension spring; or the upper end of the elastic structure 9 is fixed to the lower end of the piston 8, and the lower end is fixed to the opening of the air pressure pipe 7, forming a compression spring.

[0070] This is a further preferred structure of the air pressure pipe of the present application, preferably the upper end is fixed to the inner top end of the liquid storage tank, forming a relative seal with the inside of the liquid storage tank, and the elastic structure preferably has the upper end fixed to the inner top end of the liquid storage tank and the lower end fixed to the upper end of the piston, forming a tension spring, which can exert an elastic tension force on the piston preferably upward (Example 1, as shown in Figure 1 ), or the elastic structure preferably has the upper end fixed to the lower end of the piston and the lower end fixed to the opening of the air pressure pipe 7, forming a compression spring, which can exert an elastic compression force on the piston preferably upward (Example 2, as shown in Figure 2 ), and the lower end of the air pressure pipe is spaced apart from the bottom of the liquid storage tank, which can ensure that the space below the piston is in communication with the liquid storage tank, so that the pressure below the piston is the pressure inside the liquid storage tank, and the opening structure of the lower end of the air pressure pipe can allow the liquid taking part to pass through, so as to realize the effect of the liquid taking part moving in the up-down direction to take liquid and discharge liquid from different heights according to different exhaust pressures.

[0071] The blind pipe structure at the top of the air pressure pipe of the present application is welded and fixed to the inner top of the liquid storage tank and achieves a sealing effect, and the pressure taking port at the top of the liquid storage tank is preferably aligned with the pressure taking port on the end face of the top of the air pressure pipe (in this case, the upper end of the air pressure pipe has a solid end face structure), and of course the top end face of the air pressure pipe of the present application preferably does not have a solid end face, but is directly fixed to the inner top of the liquid storage tank through the peripheral wall.

[0072] In some embodiments,

[0073] The liquid taking part 6 is a floating ball which can float on the liquid surface in the liquid storage tank 2, and the floating ball is provided with a suction port to suck in the liquid on the liquid surface into the inside of the floating ball and discharge it through the hose 201;

[0074] Further comprising a sling 12, and the floating ball is connected to the lower end of the piston 8 through the sling 12.

[0075] This is the preferred structure of the liquid taking part of the present application, that is, it can preferably be the structure of a floating ball, but can be driven by the piston to move in the up-down direction, and can take liquid on the liquid surface, or can move below the liquid surface to take and discharge liquid. The present application further realizes the connection between the floating ball and the piston through the structure of the sling, so that the floating ball is driven to move up and down by the movement of the piston to take and discharge liquid at different heights according to different exhaust pressures.

[0076] The sling and the hose of the present application are preferably made of flexible materials.

[0077] In some embodiments,

[0078] The liquid taking part 6 has a channel passing through its interior, and has two or more ports, one of which is the suction port, and one of which is connected to one end of the hose 201.

[0079] The lower end of the gas pressure pipe 7 is a constricted port, and in the projection plane of the horizontal plane, the horizontal plane projection area of the liquid taking part 6 is smaller than the projection area of the constricted port, and the horizontal plane projection area of the piston 8 is larger than the projection area of the constricted port.

[0080] This is a further preferred structure of the liquid taking part of the present application, which can take in the refrigerant liquid in the liquid storage tank through at least one port as a suction port, and at least one port is connected to one end of the hose, so as to guide the refrigerant liquid in the liquid storage tank to the hose and discharge it outward. The lower end of the gas pressure pipe of the present application is preferably a constricted port, and its projection area is smaller than the horizontal projection area of the piston, which can limit the lowermost position of the piston to prevent the piston from moving downward and out of the gas pressure pipe. The horizontal projection area of the liquid taking part is smaller than the area of the constricted port, so that the liquid taking part can move freely up and down inside and outside the gas pressure pipe.

[0081] The liquid storage tank of the present application comprises a gas pressure pipe assembly and a liquid taking pipe assembly; the gas pressure pipe assembly comprises a gas pressure pipe, a spring and a piston; the gas pressure pipe is preferably a blind pipe structure with a constricted port, and the gas pressure pipe is vertically inverted and fixed on the top end inside the liquid storage tank, the constricted port (open end) is arranged downward, and a horizontal piston and a spring are arranged inside the constricted port. The tension spring is arranged in the closed gas pressure chamber and / or the compression spring is arranged between the lower end surface of the piston and the constricted port of the gas pressure pipe, and the constricted port can prevent the piston from being pulled out of the gas pressure pipe; the top end surface (blind pipe end) of the gas pressure pipe is provided with a pressure taking port, so that the closed gas pressure chamber in the gas pressure pipe can be communicated with the outside through the pressure taking port at the top end.

[0082] In some embodiments,

[0083] The second pipeline 102 is communicated with the inside of the liquid storage tank 2 at one end and communicated with the evaporator 5 at the other end, and the throttling valve 4 is arranged on the second pipeline 102 to enable the refrigerant in the liquid storage tank 2 to be led out to the throttling valve 4.

[0084] The top of the liquid storage tank 2 is provided with an inlet 18 and a pressure tapping 19, the inlet 18 is located at a position opposite to the radial outer side of the gas pressure pipe 7, the other end of the first pipeline 101 is communicated with the inlet 18 to enable the refrigerant to be introduced into the inside of the liquid storage tank 2, and the pressure tapping 19 is located at a position opposite to the inner periphery of the gas pressure pipe 7, the other end of the pressure tapping pipe 104 is communicated with the pressure tapping 19 to enable the refrigerant to be introduced into the inside of the gas pressure pipe 7.

[0085] This is a further preferred structure of the liquid storage tank of the present application, that is, the top of the liquid storage tank is provided with an inlet and a pressure tapping, the inlet can enable the refrigerant at the outlet of the condenser to be introduced into the liquid storage tank, and the pressure tapping can enable the exhaust gas of the compressor to be introduced into the gas pressure pipe, so as to achieve the purpose of driving the piston to move up and down, and achieve the purpose and effect of different exhaust gas pressures to discharge liquid through different liquid heights.

[0086] In some embodiments,

[0087] The refrigeration system is a fluorine pump compression refrigeration system, further comprising a fluorine pump 10, a one-way valve A 11, a one-way valve B 15 and a third pipeline 103, the one-way valve A 11 is arranged on the second pipeline 102 and can only allow fluid to flow out of the liquid storage tank 2 to the second pipeline 102, one end of the third pipeline 103 is communicated to the inner bottom of the liquid storage tank 2, the other end is communicated to a position between the one-way valve A 11 and the throttling valve 4 on the second pipeline 102, and the fluorine pump 10 is arranged on the third pipeline 103; the one-way valve B 15 bypasses the compressor 1 in parallel, the inlet and outlet of the one-way valve B 15 are connected to the suction port and the exhaust port of the compressor 1 respectively, and the flow direction of the one-way valve B 15 is only allowed to point from the inlet of the compressor 1 to the outlet of the compressor;

[0088] The bottom of the liquid storage tank 2 is provided with a first liquid outlet 20 and a second liquid outlet 21, the first liquid outlet 20 is used to communicate the hose 201 with the second pipeline 102, and the second liquid outlet 21 is used to communicate the third pipeline 103 with the inside of the liquid storage tank 2.

[0089] This is the preferred structure of the refrigeration system of the present application, i.e. the fluorine pump compression refrigeration system comprising a fluorine pump, the fluorine pump of the present application is communicated to the inner bottom of the liquid storage tank through the third pipeline, so as to ensure that there is a larger or maximum amount of refrigerant into the system when the fluorine pump mode is running (compared with the compression refrigeration mode) or the maximum amount of refrigerant participating in the system operation in the compression refrigeration mode is equal to the amount of refrigerant in the fluorine pump mode; The first and second liquid outlets are arranged at the bottom of the liquid storage tank, the first liquid outlet is used to guide the refrigerant liquid discharged from the liquid taking part to participate in the circulation in the system (preferably in the compression refrigeration mode), and the second liquid outlet is used to guide the refrigerant liquid in the liquid storage tank to participate in the circulation in the fluorine pump mode.

[0090] As shown in Figure 1 The fluorine pump compression refrigeration system is sequentially connected by a compressor 1, a condenser 3, a liquid storage tank 2, a fluorine pump 10, a throttling valve 4 and an evaporator 5; A one-way valve A11 is connected in parallel with the fluorine pump 10, the flow direction of the one-way valve A11 only allows the inlet of the fluorine pump 10 to point to the outlet of the fluorine pump 10, and the inlet of the one-way valve A11 is connected at the bottom area of the liquid storage tank 2 and / or connected between the outlet of the liquid storage tank 2 and the inlet of the fluorine pump 10; A one-way valve B15 is connected in parallel with the compressor, the inlet and outlet of the one-way valve B15 are connected to the suction port and the exhaust port of the compressor 1 respectively, and the flow direction of the one-way valve B15 only allows the inlet of the compressor to point to the outlet of the compressor.

[0091] The present application designs a refrigerant outlet with adjustable height in the liquid storage tank, so that the refrigerant pipe port changes with the change of the operating frequency in the compression refrigeration mode, and then the amount of refrigerant liquid retained in the liquid storage tank changes, so that the compression refrigeration system has the best refrigerant circulation amount under different working conditions.

[0092] In some embodiments,

[0093] An oil separator 13 is further included, which is communicated and arranged between the exhaust port of the compressor 1 and the condenser 3, and one end of the pressure taking pipe 104 is connected between the gas outlet of the oil separator 13 and the inlet of the condenser 3, so as to obtain gas with exhaust pressure.

[0094] The fluorine pump compression refrigeration system of the present application preferably passes through the pressure taking pipe, one end of the pressure taking pipe sequentially passes through the pressure taking port of the liquid storage tank and the pressure taking port of the air pressure pipe and is welded and sealed, the port extends into the closed air pressure chamber so that the air pressure chamber is communicated with the outside through the pressure taking pipe, and the other end of the pressure taking pipe of the present application is preferably connected to the exhaust pipe between the compressor and the condenser (preferably connected between the gas outlet of the oil separator 13 and the inlet of the condenser 3).

[0095] It is a further preferred structure of the present application, by the setting of the oil separator, and the one end of the pressure pipe is connected between the gas outlet of the oil separator 13 and the inlet of the condenser 3, the gas with the compressor discharge pressure can be introduced into the gas pressure pipe of the liquid storage tank from the oil separator, so as to drive the piston in the gas pressure pipe to move up and down, so as to achieve the purpose and effect that the liquid taking part takes liquid from different heights under different exhaust pressures; the purpose and effect that more refrigerant liquid is led out through the lower liquid taking part to participate in the system circulation under high frequency operation, so as to meet the refrigeration / heat demand under larger load or working condition; the purpose and effect that less refrigerant liquid is led out through the higher liquid taking part to participate in the system circulation under low frequency operation, so as to effectively solve the refrigerant redundancy problem caused by the difference of the required refrigerant filling amount under different operating conditions of the fluorine pump compression refrigeration system.

[0096] As shown in Figure 1 , the fluorine pump compression refrigeration system of the present application is sequentially connected by a compressor, a condenser, a liquid storage tank, a fluorine pump, a throttling valve and an evaporator;

[0097] The fluorine pump compression refrigeration system of the present application further comprises a one-way valve A, one liquid outlet of the liquid storage tank is connected to the inlet of the fluorine pump, and the other liquid outlet is connected to the inlet of the one-way valve A, and the outlet of the one-way valve A is connected between the outlet of the fluorine pump and the inlet of the throttling valve;

[0098] The fluorine pump compression refrigeration system of the present application further comprises a one-way valve B, the one-way valve B is connected in parallel to bypass the compressor, the inlet and outlet of the one-way valve B are connected to the suction port and the exhaust port of the compressor respectively, and the flow direction of the one-way valve B is only allowed to point from the inlet of the compressor to the outlet of the compressor;

[0099] The fluorine pump compression refrigeration system of the present application further comprises an oil separator and a capillary tube for oil return, the oil separator is connected between the exhaust port of the compressor and the inlet of the condenser, the gas inlet of the oil separator is connected to the exhaust port of the compressor, and the gas outlet of the oil separator is connected to the inlet of the condenser, and the capillary tube is connected between the oil outlet of the oil separator and the suction port of the compressor.

[0100] The working principle of the present application (see Figures 1-2 ):

[0101] Compression refrigeration mode-the fluorine pump is closed, the compressor is started, and the exhaust pressure of the compressor is different under different operating frequencies, the piston position is automatically adjusted according to the pressure difference, the liquid taking ball at the lower part of the piston is driven to move up and down, so as to change the refrigerant liquid level height in the liquid storage tank, the liquid in the liquid storage tank enters the liquid taking ball and flows out from the first liquid outlet 20 through the hose, therefore the refrigerant liquid in the liquid storage tank changes, so as to solve the matching problem of the optimal refrigerant circulation amount under different operating conditions, and the higher the operating frequency range of the compressor is, the lower the liquid level in the liquid storage tank is.

[0102] The high pressure exhaust pressure of the compressor, the pressure difference between the refrigerant in the liquid storage tank and the spring force of the spring are used to drive and control the piston, the driving force F=P1-P2-f+G (wherein P1 is the exhaust pressure, i.e. the pressure inside the gas pressure pipe, P2 is the pressure outside the gas pressure pipe, i.e. the pressure inside the liquid storage tank, f is the spring force, and G is the gravity of the piston, and other forces such as friction of the piston are ignored in the formula), the driving force F is used to adjust the height of the piston to change the height of the liquid taking ball at the lower part of the piston, thereby controlling the height change of the liquid level in the liquid storage tank.

[0103] The higher the frequency of the compressor, the greater the exhaust pressure P1 is, and the pressure difference P1-P2 formed by the pressure P2 reaching the liquid storage tank will generally become larger (this pressure difference is mainly caused by the resistance loss generated when the refrigerant flows through the condenser and the pipeline), so as to overcome the spring to move the piston downward, and as the spring is stretched or compressed, the driving force F gradually becomes smaller, and then the piston will reach a balance position and stop descending; on the contrary, if the exhaust pressure decreases, P1-P2 decreases, and the spring force generated by the stretched or compressed spring is larger, thereby pulling the piston upward; therefore, the height of the liquid taking ball is generally negatively correlated with the frequency of the compressor, i.e. the higher the frequency of the compressor, the lower the liquid taking ball, the lower the liquid level in the liquid storage tank, and the more the refrigerant participating in the system circulation; the lower the frequency of the compressor, the higher the liquid taking ball, the higher the liquid level in the liquid storage tank, and the less the refrigerant participating in the system circulation; therefore, the technical scheme of the present application can realize the self-balancing control function of the liquid level in the liquid storage tank.

[0104] The fluorine pump refrigeration mode is that the fluorine pump is opened and the compressor is closed, because the reverse pressure difference exists between the two ends of the one-way valve A at this time, the one-way valve A cannot be turned on, and therefore the refrigerant in the pipeline where the liquid taking ball is located cannot flow; at the same time, the compressor is closed, and the pressure difference between the upper and lower parts of the piston in the gas pressure pipe is very small, which is insufficient to make the piston realize a large displacement, and therefore the liquid storage tank at this time simply serves as an ordinary liquid storage tank and does not have the function of adjusting the liquid level.

[0105] The above only describes the preferred embodiments of the present application, and should not be construed as limiting the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above only describes the preferred embodiments of the present application, and should not be construed as limiting the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A refrigeration system with a refrigerant redundancy adjustment function, characterized in that: Comprise: Compressor (1), liquid tank (2), condenser (3), first pipeline (101), second pipeline (102) and pressure tube (104), one end of the first pipeline (101) is communicated with the condenser (3), the other end is communicated with the inside of the liquid tank (2), so that the refrigerant in the condenser (3) can be introduced into the liquid tank (2), the liquid refrigerant in the liquid tank (2) can be discharged to the second pipeline (102), one end of the pressure tube (104) can introduce gas with the exhaust pressure of the compressor (1), the other end can introduce the gas into the liquid tank (2), the size of the exhaust pressure introduced by the pressure tube (104) can control the change of the liquid level in the liquid tank (2), the higher the exhaust pressure of the compressor (1), the lower the liquid level in the liquid tank (2), vice versa, the lower the exhaust pressure of the compressor (1), the higher the liquid level in the liquid tank (2), so that less refrigerant amount enters the system under low frequency operation to participate in circulation.

2. The refrigeration system with refrigerant redundancy adjustment function according to claim 1, characterized in that: It further comprises a liquid taking part (6) and a hose (201), the liquid taking part (6) and the hose (201) are located in the inside of the liquid tank (2), the lower end of the liquid taking part (6) is communicated with one end of the second pipeline (102) through the hose (201), the upper end of the liquid taking part (6) is located below or flush with the liquid level of the liquid tank (2), the liquid taking part (6) can introduce the liquid in the liquid tank (2) and export it to the hose (201), and the height of the liquid taking part (6) changes with the change of the exhaust pressure of the compressor (1), the higher the exhaust pressure of the compressor (1), the lower the height of the liquid taking part (6), vice versa, the lower the exhaust pressure of the compressor (1), the higher the height of the liquid taking part (6).

3. The refrigeration system with refrigerant redundancy adjustment function according to claim 2, characterized in that: It further comprises a gas pressure tube (7) and a piston (8), the gas pressure tube (7) is arranged in the inside of the liquid tank (2), the piston (8) is arranged in the inside of the gas pressure tube (7), the piston (8) divides the inside of the gas pressure tube (7) into upper space and lower space, the piston (8) can move up and down in the gas pressure tube (7), the other end of the pressure tube (104) is connected to the upper space of the gas pressure tube (7), the lower space is communicated with the inside of the liquid tank (2), the liquid taking part (6) is connected with the piston (8) to move with the up and down movement of the piston (8) to act on the piston (8) with different force under different exhaust pressure to drive the piston (8) to move to different height to make the liquid taking part (6) take liquid at different height to export the liquid in the liquid tank (2).

4. The refrigeration system with refrigerant redundancy adjustment function according to claim 3, characterized in that: Further comprising an elastic structure (9) arranged in the upper space or the lower space of the gas pressure pipe (7), one end of the elastic structure (9) is connected with the piston (8), and the other end of the elastic structure (9) is fixed; the higher the exhaust pressure of the compressor (1) is, the lower the height reached by the downward movement of the piston (8) is, at this time, the longer the length of the elastic structure (9) is elongated or compressed, and the greater the elastic force f is, so that the piston (8) finally reaches an equilibrium state, and the lower the liquid taking height of the liquid taking part (6) is in the equilibrium state; on the contrary, the lower the exhaust pressure of the compressor (1) is, the higher the height reached by the downward movement of the piston (8) is, at this time, the shorter the length of the elastic structure (9) is elongated or compressed, and the smaller the elastic force f is, so that the piston (8) finally reaches an equilibrium state, and the higher the liquid taking height of the liquid taking part (6) is in the equilibrium state.

5. The refrigeration system with refrigerant redundancy adjustment function according to claim 4, characterized in that: The upper end of the gas pressure pipe (7) is fixed to the inner top end of the liquid storage tank (2), so that the upper space in the gas pressure pipe (7) forms a relative seal with the inner space of the liquid storage tank (2); the lower end of the gas pressure pipe (7) is spaced apart from the inner bottom end of the liquid storage tank (2) by a predetermined distance, and the lower end of the gas pressure pipe (7) forms an opening to allow the liquid taking part (6) to pass through. The upper end of the elastic structure (9) is fixed to the inner top end of the liquid storage tank (2), and the lower end of the elastic structure (9) is fixed to the upper end of the piston (8), forming a tension spring; or the upper end of the elastic structure (9) is fixed to the lower end of the piston (8), and the lower end of the elastic structure (9) is fixed to the opening of the gas pressure pipe (7), forming a compression spring.

6. The refrigeration system with refrigerant redundancy adjustment function according to claim 3, characterized in that: The liquid taking part (6) is a floating ball that can float on the liquid surface in the liquid storage tank (2), and the floating ball is provided with a suction port to suck the liquid on the liquid surface into the interior of the floating ball and discharge it through the hose (201); Further comprising a sling (12) connecting the floating ball to the lower end of the piston (8).

7. The refrigeration system with refrigerant redundancy adjustment function according to claim 6, characterized in that: The liquid taking part (6) has a channel passing through its interior, and the liquid taking part (6) has two or more ports, one of which is the suction port, and one of which is connected to one end of the hose (201); The lower end of the gas pressure pipe (7) is a constricted port, and in the horizontal plane projection, the horizontal plane projection area of the liquid taking part (6) is smaller than the projection area of the constricted port, and the horizontal plane projection area of the piston (8) is greater than the projection area of the constricted port.

8. The refrigeration system with refrigerant redundancy adjustment function according to claim 3, characterized in that: Further comprising an evaporator (5) and a throttling valve (4), one end of the second pipeline (102) is communicated with the inside of the liquid storage tank (2), and the other end is communicated with the evaporator (5), the throttling valve (4) is arranged on the second pipeline (102) to enable the refrigerant in the liquid storage tank (2) to be discharged to the throttling valve (4); The top of the liquid storage tank (2) is provided with an inlet (18) and a pressure tapping (19), the inlet (18) is located at a position opposite to the radial outer side of the gas pressure pipe (7), the other end of the first pipeline (101) is communicated with the inlet (18) to introduce refrigerant into the inside of the liquid storage tank (2), and the pressure tapping (19) is located at a position opposite to the inner wall of the gas pressure pipe (7), the other end of the pressure tapping pipe (104) is communicated with the pressure tapping (19) to introduce refrigerant into the inside of the gas pressure pipe (7).

9. The refrigeration system with refrigerant redundancy adjustment function according to claim 8, characterized in that: The refrigeration system is a fluorine pump compression refrigeration system, further comprising a fluorine pump (10), a one-way valve A (11), a one-way valve B (15) and a third pipeline (103), the one-way valve A (11) is arranged on the second pipeline (102) and can only allow fluid to flow from the liquid storage tank (2) to the second pipeline (102), one end of the third pipeline (103) is communicated to the inner bottom of the liquid storage tank (2), and the other end is communicated to a position between the one-way valve A (11) and the throttling valve (4) on the second pipeline (102), and the fluorine pump (10) is arranged on the third pipeline (103); the one-way valve B (15) bypasses the compressor (1), and the inlet and outlet of the one-way valve B (15) are connected to the suction port and the exhaust port of the compressor (1), respectively, and the flow direction of the one-way valve B (15) is only allowed to point from the inlet of the compressor (1) to the outlet of the compressor; The bottom of the liquid storage tank (2) is provided with a first liquid outlet (20) and a second liquid outlet (21), the first liquid outlet (20) is used to communicate the hose (201) with the second pipeline (102), and the second liquid outlet (21) is used to communicate the third pipeline (103) with the inside of the liquid storage tank (2).

10. The refrigeration system with refrigerant redundancy adjustment function according to any one of claims 1-9, characterized in that: Further comprising an oil separator (13), the oil separator (13) is communicated and arranged between the exhaust port of the compressor (1) and the condenser (3), and one end of the pressure tapping pipe (104) is connected between the gas outlet of the oil separator (13) and the inlet of the condenser (3) to obtain gas with exhaust pressure.

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