Jet evaporation liquid storage tank and air conditioner

Abstract

The invention provides an injection evaporation liquid storage tank which comprises a tank body, an air return pipe and an injector, the injector comprises an injection pipe, a high-pressure air inlet pipe and a low-pressure air inlet pipe, the injection pipe is located in an inner cavity, and the high-pressure air inlet pipe and the low-pressure air inlet pipe penetrate through the top of the tank body to be communicated with the injection pipe. The injection pipe is provided with an injection port, and the injection port faces the side wall of the tank body. The invention further provides an air conditioner adopting the liquid storage tank for jet evaporation.

Description

Technical Field

[0001] The present invention relates to the technical field related to household air conditioners, and more precisely to a liquid storage tank for jet evaporation and an air conditioner. Background Art

[0002] The liquid storage tank of the air conditioner is used to store and buffer high-pressure liquid refrigerant. In the early stage of the low-temperature air source heat pump heating startup, the existing liquid storage tank is placed in a low-temperature environment for a long time, and the liquid refrigerant in the tank accumulates and freezes at the bottom; when the system builds pressure on both sides, the liquid storage tank is on the low-pressure side again. At this time, the refrigerant in the tank is a supercooled liquid under low temperature and low pressure, and the evaporation rate is very slow, resulting in a small amount of air intake by the compressor and a small amount of refrigerant involved in the circulation, resulting in low energy efficiency of the system's low-temperature heating ability, affecting the user's experience.

[0003] In the prior art, electric heating is usually used to heat the bottom of the liquid storage tank to increase the evaporation of the liquid refrigerant. This method is highly efficient, but it will increase the power of the air conditioner's electric heating, reducing the overall energy efficiency of the air conditioner. In the prior art, there is also a solution to achieve refrigerant heat exchange to increase the evaporation of the liquid by setting a microchannel heat exchanger inside the liquid storage tank. However, this solution is limited by the structure of the heat exchanger, and the heat exchange efficiency fluctuates greatly in actual use.

[0004] In summary, this field needs to improve the liquid storage tank of the air conditioner, increase the pressure inside the liquid storage tank in an isothermal environment without increasing the electric heating power, increase the evaporation amount of liquid refrigerant, and thereby improve the low-temperature heating capacity and energy efficiency. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a liquid storage tank with jet evaporation, in which the tank body is combined with an ejector, which increases the evaporation pressure of the refrigerant inside the tank body, increases the evaporation rate of the liquid refrigerant at the bottom of the tank body, increases the gas return volume of the compressor, and thereby improves the energy efficiency of low-temperature heating.

[0006] Another object of the present invention is to provide an air conditioner using the spray evaporation liquid storage tank.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a liquid storage tank for jet evaporation, comprising a tank body, an air return pipe and an ejector, wherein the ejector comprises an ejection pipe, a high-pressure air intake pipe and a low-pressure air intake pipe, wherein the ejection pipe is located inside the inner cavity, the high-pressure air intake pipe and the low-pressure air intake pipe pass through the top of the tank body and are connected with the ejection pipe, and the ejection pipe has an ejection port, and the ejection port faces the side wall of the tank body.

[0008] Preferably, the plane of the outlet is parallel to the inner wall of the tank body.

[0009] Preferably, the injection pipe is arranged obliquely inside the inner cavity.

[0010] Preferably, it comprises a liquid isolation plate, which is installed inside the inner cavity, the liquid isolation plate and the top of the tank body form a gas cavity, and the air intake port is located inside the gas cavity; the liquid isolation plate is provided with a plurality of small holes.

[0011] Preferably, the top of the tank body has an upper cover, and the bottom has a lower cover; the return air pipe, the high-pressure air intake pipe, and the low-pressure air intake pipe all pass through the upper cover.

[0012] Preferably, the included angle between the vertical projection line of the injection pipe and the tangent line corresponding to the intersection point of the tank side wall is greater than 90°.

[0013] Preferably, the injection pipe has a high-pressure inlet, a low-pressure inlet and a tube cavity, the high-pressure inlet and the low-pressure inlet are connected to the tube cavity, and the outlet is located at one end of the tube cavity away from the high-pressure inlet and the low-pressure inlet; the high-pressure air inlet pipe is connected to the high-pressure inlet, and the low-pressure air inlet pipe is connected to the low-pressure inlet.

[0014] Preferably, the high-pressure inlet has a nozzle extending into the tube cavity, the nozzle has a throat, and the tube cavity has a nozzle docking cavity, a mixing chamber and a diffuser section in sequence along the direction from the nozzle to the outlet, the cross-sectional area of ​​the mixing chamber is smaller than the cross-sectional area of ​​the nozzle docking cavity, and the cross-sectional area of ​​the diffuser section gradually increases along the direction from the mixing chamber to the outlet.

[0015] The present invention provides an air conditioner, comprising a compressor, a condenser, an evaporator and a liquid storage tank for jet evaporation, wherein the liquid storage tank for jet evaporation is connected to the compressor through the outlet, connected to the condenser through the high-pressure air intake pipe, and connected to the evaporator through the low-pressure air intake pipe, and the compressor, the condenser and the evaporator are connected in series in sequence, a first valve is installed on the pipeline connecting the condenser and the evaporator, and a second valve is installed on the pipeline connecting the condenser and the high-pressure air intake pipe.

[0016] Preferably, the first valve is an electronic expansion valve, and the second valve is a solenoid valve or an electronic expansion valve.

[0017] Compared with the prior art, the advantages of the jet evaporation liquid storage tank and air conditioner disclosed in the present invention are: the jet evaporation liquid storage tank increases the evaporation rate of the liquid refrigerant at the bottom of the tank body through the ejector, which helps to increase the gas return volume of the compressor, thereby improving the low-temperature heating capacity of the air conditioner; the jet evaporation liquid storage tank does not require electric heating, and will not increase the electric heating power, which helps to improve energy efficiency; the jet evaporation liquid storage tank has no moving parts, has a stable structure and is not easy to damage; the air conditioner using the jet evaporation liquid storage tank has better heating capacity and energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 Shown is a schematic structural diagram of a liquid storage tank for jet evaporation according to the present invention.

[0020] Figure 2 Shown is a schematic structural diagram of a liquid storage tank for jet evaporation according to the present invention after the tank body is removed.

[0021] Figure 3 The figure shows a front view of a liquid storage tank for jet evaporation according to the present invention with the tank body removed.

[0022] Figure 4 The figure shows a schematic structural diagram of a liquid storage tank for jet evaporation according to the present invention after the tank body and the upper cover are removed.

[0023] Figure 5 Shown is a top view of a liquid storage tank for jet evaporation according to the present invention.

[0024] Figure 6 Shown Figure 5 Section view of the AA plane.

[0025] Figure 7 Shown is a cross-sectional view of a liquid storage tank for jet evaporation according to the present invention.

[0026] Figure 8 Shown is a cross-sectional view of an injection pipe of the injector.

[0027] Fig. 9 Shown is a schematic diagram of the connection between a liquid storage tank for jet evaporation and air-conditioning related components of the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figures 1 to 6As shown, the present application is a liquid storage tank for jet evaporation, comprising a tank body 1, a return air pipe 2 and an ejector 3, wherein the tank body 1 has an inner cavity 10; one end of the return air pipe 2 passes through the top of the tank body 1 to form an outlet 21, and the other end of the return air pipe 2 is located at the top of the inner cavity 10 to form an air intake 22, and the U-shaped bottom end of the return air pipe 2 is located at the bottom of the inner cavity 10; the ejector 3 comprises an ejector pipe 31, a high-pressure air intake pipe 32 and a low-pressure air intake pipe 33, the ejector pipe 31 is located inside the inner cavity 10, the high-pressure air intake pipe 31 and the low-pressure air intake pipe 33 pass through the top of the tank body 1 to communicate with the ejector pipe 31, and the ejector pipe 31 has an outlet 311, and the outlet 311 faces the side wall of the tank body 1. The high-pressure air inlet pipe 32 is the inlet of the high-pressure fluid of the liquid storage tank, and the low-pressure air inlet pipe 33 is the inlet of the low-pressure fluid of the liquid storage tank. The two fluids are mixed in the injection pipe 31 to become a high-temperature fluid of intermediate pressure, and are injected into the inner cavity 10, so that the pressure in the inner cavity 10 rises to an intermediate pressure that makes it easy for the liquid phase refrigerant to evaporate, thereby increasing the evaporation rate of the liquid phase refrigerant at the bottom of the inner cavity 10, thereby increasing the gas phase return air volume of the compressor, and then improving the low-temperature heating capacity of the air conditioner.

[0030] Specifically, the high-temperature fluid of intermediate pressure is ejected from the outlet 311 and sprayed onto the inner wall of the tank body 1, and performs centrifugal motion around the inner wall. Since the fluid ejected from the outlet 311 has very high kinetic energy, the initial speed of the centrifugal motion of the fluid is very large, which helps to improve the separation efficiency of the gas-liquid two phases. During the process, the gas-phase refrigerant rises, and the liquid-phase refrigerant continues to perform centrifugal motion and finally reaches the bottom of the inner cavity 10. The liquid-phase refrigerant accumulated at the bottom of the inner cavity 10 accelerates evaporation under higher pressure and refrigerant impact, rises to the top of the inner cavity 10, and is output to the outside of the liquid storage tank by the return air pipe 2.

[0031] Preferably, the plane of the outlet 311 is parallel to the inner wall of the tank body 1 to increase the flow path and improve the gas-liquid two-phase separation efficiency during the centrifugal movement.

[0032] Preferably, the injection pipe 31 is arranged obliquely inside the inner cavity 10 , and the high-pressure and low-pressure fluids are pre-separated into gas and liquid in the inclined injection pipe 31 .

[0033] The liquid storage tank for jet evaporation also includes a liquid partition plate 13, which is installed inside the inner cavity 10, and the liquid partition plate 13 is located at the upper part of the inner cavity 10. The liquid partition plate 13 and the top of the tank body 1 form a gas cavity 100, and the air intake port 22 is located inside the gas cavity 100. There are a number of small holes 131 on the liquid partition plate 13. After the refrigerant at the bottom of the inner cavity 10 evaporates, it rises to form a mist refrigerant. During the rising process, the gaseous refrigerant passes through the small holes 131 and enters the gaseous cavity 100, and the liquid refrigerant is blocked, so that the gas and liquid are fully separated. The liquid refrigerant condenses into liquid on the lower surface of the liquid partition plate 12 and falls under the action of gravity, ensuring the dryness of the return gas.

[0034] The top of the tank body 1 has an upper cover 11, and the bottom has a lower cover 12. The return air pipe 2, the high-pressure air intake pipe 32, and the low-pressure air intake pipe 33 all penetrate the upper cover 11. The ejector 3 and the return air pipe 2 are arranged at intervals to prevent the two from colliding. Preferably, the angle θ between the vertical projection line of the ejector pipe 31 and the tangent corresponding to the intersection of the side wall of the tank body 1 is greater than 90°, and the larger the angle θ, the smaller the kinetic energy loss of the ejected fluid, and the easier it is to adhere to the inner wall of the tank body 1 for centrifugal motion.

[0035] See also Figure 7 and Figure 8 The injection pipe 31 has a high pressure inlet 312, a low pressure inlet 313 and a tube cavity 310. The high pressure inlet 312 and the low pressure inlet 313 are connected to the tube cavity 310. The outlet 311 is located at one end of the tube cavity 310 away from the high pressure inlet 312 and the low pressure inlet 313. The high pressure air inlet pipe 32 is connected to the high pressure inlet 312, and the low pressure air inlet pipe 33 is connected to the low pressure inlet 313.

[0036] Specifically, the high-pressure inlet 312 has a nozzle extending into the tube cavity 310, the nozzle has a throat 3121, and the tube cavity 310 has a nozzle docking chamber 3101, a mixing chamber 3102 and a diffuser section 3103 in sequence along the direction from the nozzle to the outlet 311. The cross-sectional area of ​​the mixing chamber 3102 is smaller than the cross-sectional area of ​​the nozzle docking chamber 3101, and the cross-sectional area of ​​the diffuser section 3103 gradually increases along the direction from the mixing chamber 3102 to the outlet 311. The high-pressure fluid enters the nozzle through the high-pressure inlet 312, and is compressed at the throat 3121 and forms a blockage at the nozzle docking chamber 3101, so that the nozzle docking chamber 3101 forms an instantaneous vacuum negative pressure state, and the low-pressure fluid is ejected; then the high-pressure and low-pressure fluids are mixed in the mixing chamber 3102, and the high-pressure fluid expands and compresses the low-pressure fluid. At the same time, the pressure potential energy of the fluid is converted into kinetic potential energy. The mixed fluid further expands in the diffuser section 3103, and the pressure is reduced to an intermediate pressure value between the high and low fluids, and is finally ejected into the inner cavity 10 through the outlet.

[0037] See also Fig. 9In the air conditioner using the liquid storage tank for jet evaporation, the liquid storage tank for jet evaporation is connected to the compressor 4 through the outlet 21, connected to the condenser 5 through the high-pressure air intake pipe 32, and connected to the evaporator 6 through the low-pressure air intake pipe 33, and the compressor 4, the condenser 5, and the evaporator 6 are connected in series in sequence, and a first valve 61 is installed on the pipeline connecting the condenser 5 and the evaporator 6, and a second valve 51 is installed on the pipeline connecting the condenser 5 and the high-pressure air intake pipe 32. During the operation of the air conditioner, the compressor 4 discharges high-temperature and high-pressure gas-phase refrigerant, which is transported to the condenser 5. After heat exchange in the condenser 5, it forms a high-temperature and high-pressure liquid-phase refrigerant. After throttling by the first valve 61, it becomes an isothermal and low-pressure two-phase refrigerant, and then enters the evaporator 6 to form a low-temperature and low-pressure gas-phase refrigerant. The low-temperature and low-pressure gas-phase refrigerant enters the ejector 3 through the low-pressure air inlet pipe 33; part of the liquid-phase refrigerant formed by heat exchange in the condenser 5 passes through the second valve 51 and enters the ejector 3 through the high-pressure air inlet pipe 32. The high-temperature and high-pressure liquid-phase refrigerant and the low-temperature and low-pressure gas-phase refrigerant are mixed in the ejector 3.

[0038] Among them, the first valve 61 is an electronic expansion valve, and the second valve 51 is a solenoid valve or an electronic expansion valve. When the air conditioner meets the low-temperature opening condition, the second valve 51 is opened, and the ejector 3 is connected with the condenser 5 and the evaporator 6, and the liquid phase and gas phase refrigerant are mixed and injected; when the air conditioner does not meet the low-temperature opening condition, the second valve 51 is closed, and the ejector 3 is only connected with the evaporator 6, and the ejector 3 has no actual effect. In actual use, the opening and closing conditions of the second valve 51 need to be set according to the working conditions and temperature conditions.

[0039] Combination Figure 8 When the system is running at high temperature, the air intake of the compressor 4 is sufficient, so the second valve 51 can be closed to reduce the throttling loss of the air conditioning system. At this time, the ejector 3 is only connected to the evaporator 6 and the low-pressure side of the system is established, and the entire system is consistent with the conventional steam compression cycle. When the system is running at low temperature, the second valve 51 is opened, and the high-pressure liquid phase and low-pressure gas phase refrigerant are mixed inside the tube cavity 310, and then ejected by the ejector 3 to increase the internal pressure of the tank 1, the liquid phase refrigerant at the bottom evaporates quickly, and the air intake of the compressor 4 is increased, thereby improving the low-temperature heating capacity of the air conditioner.

[0040] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A liquid storage tank for jet evaporation, It is characterized in that It includes a tank body, a return air pipe and an injector, wherein the injector includes an injection pipe, a high-pressure air intake pipe and a low-pressure air intake pipe, wherein the injection pipe is located inside the inner cavity, the high-pressure air intake pipe and the low-pressure air intake pipe pass through the top of the tank body and are connected with the injection pipe, and the injection pipe has an outlet, which faces the side wall of the tank body.

2. The liquid storage tank for jet evaporation according to claim 1, It is characterized in that The plane of the emission port is parallel to the inner side wall of the tank body.

3. The liquid storage tank for jet evaporation according to claim 1, It is characterized in that The injection pipe is arranged obliquely inside the inner cavity.

4. The liquid storage tank for jet evaporation according to claim 1, It is characterized in that It comprises a liquid isolation plate, which is installed inside the inner cavity. The liquid isolation plate and the top of the tank body form a gas cavity, and the air inlet is located inside the gas cavity. The liquid isolation plate is provided with a plurality of small holes.

5. The liquid storage tank for jet evaporation according to claim 1, It is characterized in that The top of the tank body is provided with an upper cover, and the bottom is provided with a lower cover; the return air pipe, the high-pressure air intake pipe, and the low-pressure air intake pipe all pass through the upper cover.

6. The liquid storage tank for jet evaporation according to claim 1, It is characterized in that The included angle between the vertical projection line of the injection pipe and the tangent line corresponding to the intersection point of the tank side wall is greater than 90°.

7. The liquid storage tank for jet evaporation according to claim 1, It is characterized in that The injection pipe has a high-pressure inlet, a low-pressure inlet and a tube cavity, the high-pressure inlet and the low-pressure inlet are connected to the tube cavity, and the outlet is located at one end of the tube cavity away from the high-pressure inlet and the low-pressure inlet; the high-pressure air inlet pipe is connected to the high-pressure inlet, and the low-pressure air inlet pipe is connected to the low-pressure inlet.

8. The liquid storage tank for jet evaporation as claimed in claim 7, It is characterized in that The high-pressure inlet has a nozzle extending into the tube cavity, the nozzle has a throat, and the tube cavity has a nozzle docking cavity, a mixing chamber and a diffuser section in sequence along the direction from the nozzle to the outlet. The cross-sectional area of ​​the mixing chamber is smaller than the cross-sectional area of ​​the nozzle docking cavity, and the cross-sectional area of ​​the diffuser section gradually increases along the direction from the mixing chamber to the outlet.

9. An air conditioner, It is characterized in that It includes a compressor, a condenser, an evaporator and a liquid storage tank for jet evaporation as described in any one of claims 1 to 8, wherein the liquid storage tank for jet evaporation is connected to the compressor through the outlet, connected to the condenser through the high-pressure air inlet pipe, and connected to the evaporator through the low-pressure air inlet pipe, a first valve is installed on the pipeline connecting the condenser and the evaporator, and a second valve is installed on the pipeline connecting the condenser and the high-pressure air inlet pipe.

10. The air conditioner according to claim 9, It is characterized in that The first valve is an electronic expansion valve, and the second valve is a solenoid valve or an electronic expansion valve.

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