A heat pump system with a strong steam enthalpy increase function

Abstract

The present invention discloses a heat pump system with a strong steam injection and enthalpy increase function, comprising: a first condenser, an evaporator, a first expansion valve, a second expansion valve, a heat exchanger, a compressor, and a steam injection and enthalpy increase pump; the compressor, the first condenser, the heat exchanger, the second expansion valve, the evaporator, and the compressor are connected in sequence to form a first main circuit for completing the refrigeration or heating process; the first condenser is further connected to the steam injection and enthalpy increase pump through the first expansion valve and the heat exchanger, and the steam injection and enthalpy increase pump injects the gaseous refrigerant condensed by the first condenser into the compression chamber of the compressor. In the present invention, the first condenser, the first expansion valve, the heat exchanger, the steam injection and enthalpy increase pump, and the compressor form a steam supply circuit that forcibly injects the refrigerant into the compression chamber of the compressor at a specific time. The present invention can effectively improve the refrigeration or heating effect of the entire heat pump system.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioners, and particularly relates to a heat pump system with a strong steam injection and enthalpy increase function. Background Art

[0002] In a traditional steam injection and enthalpy increase system, only the pressure difference between the condenser and the compression chamber of the compressor is used to inject the refrigerant into the compression chamber, and it cannot be injected into the exhaust chamber. Moreover, the amount of injected refrigerant is limited by the pressure difference between the condenser and the compression chamber and the diameter of the passage, resulting in a general injection effect. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention proposes a heat pump system with a strong steam injection and enthalpy increase function.

[0004] In order to achieve the above object, the technical solution of the present invention is as follows:

[0005] A heat pump system with a strong steam injection and enthalpy increase function includes: a first condenser, an evaporator, a first expansion valve, a second expansion valve, a heat exchanger, a compressor, and a steam injection and enthalpy increase pump;

[0006] The compressor, the first condenser, the heat exchanger, the second expansion valve, the evaporator, and the compressor are connected in sequence to form a first main circuit for completing the refrigeration or heating process;

[0007] The first condenser is also connected to the steam injection and enthalpy increase pump through the first expansion valve and the heat exchanger, and the steam injection and enthalpy increase pump injects the gaseous refrigerant condensed by the first condenser into the compression chamber of the compressor.

[0008] The present invention discloses a heat pump system with a strong steam injection and enthalpy increase function. The first condenser, the first expansion valve, the heat exchanger, the steam injection and enthalpy increase pump, and the compressor form a steam supply circuit for forcibly injecting the refrigerant into the compression chamber of the compressor at a specific time. The present invention can effectively improve the refrigeration or heating effect of the entire heat pump system.

[0009] By using the suction pressure drop of the steam injection and enthalpy increase pump, the evaporation temperature of the first expansion valve can be reduced, thereby further reducing the subcooling temperature of the refrigerant before the second expansion valve through the heat exchanger, and improving the operating range and refrigeration capacity of the refrigeration system.

[0010] Since this refrigeration system has a steam injection and enthalpy increase pump with strong injection, the heating capacity of the system can theoretically be significantly higher than that of a traditional steam injection and enthalpy increase compressor system.

[0011] On the basis of the above technical solution, the following improvements can be made:

[0012] As a preferred solution, the refrigeration system further includes: a second condenser, and the second condenser is connected to the steam injection and enthalpy increase pump. The steam injection and enthalpy increase pump injects the gaseous refrigerant condensed by the first condenser and the second condenser into the compression chamber of the compressor.

[0013] With the above preferred solution, the refrigerant to be injected into the compression chamber of the compressor can be further cooled.

[0014] As a preferred solution, a refrigerant pipe is provided on the compressor. One end of the refrigerant pipe is communicated with the compression chamber of the compressor, and the opposite end is connected to the steam injection and enthalpy increase pump. The steam injection and enthalpy increase pump injects gaseous refrigerant into the compression chamber of the compressor.

[0015] With the above preferred solution, the refrigerant can be quickly and effectively injected into the compression chamber of the compressor.

[0016] As a preferred solution, a pressure gauge and a pressure sensor are provided on the refrigerant pipe. The pressure sensor is connected to the steam injection and enthalpy increase pump. The steam injection and enthalpy increase pump adjusts its output pressure and flow rate according to the pressure value collected by the pressure sensor and the exhaust pressure of the compressor.

[0017] With the above preferred solution, the pressure value of the refrigerant pipe is controllable.

[0018] As a preferred solution, the steam injection and enthalpy increase pump can inject gaseous refrigerant into the exhaust chamber of the compressor. The exhaust chamber of the compressor is a part of the chamber that can communicate with the exhaust passage of the compressor and is close to the compression mechanism of the compressor.

[0019] With the above preferred solution, the exhaust temperature is further reduced.

[0020] As a preferred solution, the injection quantity and injection pressure of the refrigerant injected into the compression chamber and / or the exhaust chamber can be adjusted by the steam injection and enthalpy increase pump.

[0021] With the above preferred solution, it is adjusted by the steam injection and enthalpy increase pump.

[0022] As a preferred solution, the steam injection and enthalpy increase pump is one or more of a variable speed pump, a constant speed pump, a metering pump, and a variable pump.

[0023] With the above preferred solution, it is selected according to specific requirements.

[0024] As a preferred solution, the compressor can be a scroll compressor, a rotary compressor, or a screw compressor.

[0025] With the above preferred solution, the application range of this refrigeration system is wide.

[0026] As a preferred solution, when the compressor is a scroll compressor, the scroll compressor includes: a housing, a moving scroll plate, a stationary scroll plate, and a driving assembly. A compression chamber is formed between the moving scroll plate and the stationary scroll plate. The moving scroll plate, the stationary scroll plate, and the driving assembly are arranged in the housing. A refrigerant passage is provided on the stationary scroll plate. One end of the refrigerant passage is communicated with the refrigerant pipe, and the other end is communicated with the inlet of the compression chamber. The refrigerant pipe is connected to the steam injection and enthalpy increase pump.

[0027] With the above - mentioned preferred solution, when the compressor is a scroll compressor, the structure is simple, and the refrigerant can be smoothly injected into the compression chamber of the compressor.

[0028] As a preferred solution, when the compressor is a scroll compressor, the scroll compressor includes: a housing, a moving scroll disk, a stationary scroll disk, and a driving assembly. A compression chamber is formed between the moving scroll disk and the stationary scroll disk. The moving scroll disk, the stationary scroll disk, and the driving assembly are arranged in the housing. A refrigerant passage is provided on the stationary scroll disk. One end of the refrigerant passage is communicated with the refrigerant pipe, and the other end is respectively communicated with the compression chamber inlet and the compressor exhaust port. The refrigerant pipe is connected to the steam - injection enthalpy - increase pump.

[0029] With the above - mentioned preferred solution, when the compressor is a scroll compressor, the structure is simple, and the refrigerant can be smoothly injected into the exhaust chamber of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can be obtained based on these drawings.

[0031] Figure 1 It is a structural block diagram of a heat pump system with a strong steam - injection enthalpy - increase function provided by an embodiment of the present invention.

[0032] Figure 2 It is a schematic structural diagram of a connection component provided by an embodiment of the present invention.

[0033] Figure 3 It is a left view of the connection component provided by an embodiment of the present invention.

[0034] Figure 4 It is a right view of the connection component provided by an embodiment of the present invention.

[0035] Figure 5 It is a schematic structural diagram of the connection between the connection component and the refrigerant passage provided by an embodiment of the present invention.

[0036] Figure 6 It is a curve graph of the heating capacity change of each system when the indoor condition is 20 / - and the outdoor condition ranges from - 15°C to 15°C provided by an embodiment of the present invention.

[0037] Wherein: 1 - compressor, 11 - refrigerant channel, 2 - first condenser, 3 - first expansion valve, 4 - second expansion valve, 5 - heat exchanger, 6 - refrigerant pipe, 7 - steam injection enthalpy increase pump, 8 - evaporator, 9 - second condenser, 10 - connection assembly, 101 - first connecting pipe, 102 - second connecting pipe, 103 - internal thread, 104 - strengthening assembly. Specific embodiments

[0038] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0040] Using ordinal numbers such as "first", "second", "third", etc. to describe ordinary objects only represents different instances of similar objects, and does not intend to imply that the objects so described must have a given order in terms of time, space, sorting, or any other way.

[0041] In addition, the expression "including" an element is an "open" expression, and this "open" expression only means that there is a corresponding component, and should not be construed as excluding additional components.

[0042] In some embodiments of a heat pump system with a strong steam injection enthalpy increase function in order to achieve the purpose of the present invention, as Figure 1 shown, the refrigeration system includes: a first condenser 2, an evaporator 8, a first expansion valve 3, a second expansion valve 4, a heat exchanger 5, a compressor 1, and a steam injection enthalpy increase pump 7;

[0043] The compressor 1, the first condenser 2, the heat exchanger 5, the second expansion valve 4, the evaporator 8, and the compressor 1 are connected in sequence to form a first main circuit for completing the refrigeration or heating process;

[0044] The first condenser 2 is also connected to the steam injection enthalpy increase pump through the first expansion valve 3 and the heat exchanger 5, and the steam injection enthalpy increase pump 7 injects the gaseous refrigerant condensed by the first condenser 2 into the compression chamber of the compressor 1.

[0045] The present invention discloses a heat pump system with a strong steam injection enthalpy increase function. The first condenser 2, the first expansion valve 3, the heat exchanger 5, the steam injection enthalpy increase pump, and the compressor 1 form a steam supply circuit for forcibly injecting refrigerant into the compression chamber of the compressor 1 at a specific time. The present invention can effectively improve the refrigeration or heating effect of the entire heat pump system.

[0046] The suction pressure drop of the steam-injected enthalpy-increasing pump can be utilized to lower the evaporation temperature of the first expansion valve 3, thereby further reducing the subcooling temperature of the refrigerant before the second expansion valve 4 through the heat exchanger 5, and thus improving the operating range and refrigerating capacity of the refrigeration system.

[0047] Since this refrigeration system is equipped with a steam-injected enthalpy-increasing pump with strong injection, the heating capacity of the system can theoretically be significantly higher than that of the traditional steam-injected enthalpy compressor system.

[0048] To further optimize the implementation effect of the present invention, in some other embodiments, with the remaining characteristic technologies being the same, the difference lies in that the refrigeration system further includes: a second condenser 9, the second condenser 9 is connected to the steam-injected enthalpy-increasing pump 7, and the steam-injected enthalpy-increasing pump injects the gaseous refrigerant condensed by the first condenser 2 and the second condenser 9 into the compression chamber of the compressor 1.

[0049] By adopting the above preferred scheme, the refrigerant injected into the compression chamber of the compressor 1 can be further cooled.

[0050] As Figure 2 shown, to further optimize the implementation effect of the present invention, in some other embodiments, with the remaining characteristic technologies being the same, the difference lies in that a refrigerant pipe 6 is provided on the compressor 1, one end of the refrigerant pipe 6 communicates with the compression chamber of the compressor 1, and the opposite end thereof is connected to the steam-injected enthalpy-increasing pump 7, and the steam-injected enthalpy-increasing pump 7 injects the gaseous refrigerant into the compression chamber of the compressor 1.

[0051] By adopting the above preferred scheme, the refrigerant can be quickly and effectively injected into the compression chamber of the compressor 1.

[0052] To further optimize the implementation effect of the present invention, in some other embodiments, with the remaining characteristic technologies being the same, the difference lies in that a pressure gauge and a pressure sensor are provided on the refrigerant pipe 6, the pressure sensor is electrically connected to the steam-injected enthalpy-increasing pump 7, and the steam-injected enthalpy-increasing pump 7 adjusts its output pressure and flow rate according to the pressure value collected by the pressure sensor.

[0053] By adopting the above preferred scheme, the pressure value of the refrigerant pipe 6 can be controlled.

[0054] To further optimize the implementation effect of the present invention, in some other embodiments, with the remaining characteristic technologies being the same, the difference lies in that the steam-injected enthalpy-increasing pump 7 can inject the gaseous refrigerant into the compressor exhaust chamber, and the compressor exhaust chamber is a partial chamber that can communicate with the compressor exhaust passage and is close to the compressor compression mechanism.

[0055] By adopting the above preferred scheme, the exhaust temperature is further reduced. It should be noted that as long as the area that can be connected to the exhaust port is within the protection scope of the present invention.

[0056] Further, on the basis of the above-described embodiments, the injection amount and injection pressure of the refrigerant injected into the compression chamber and / or the exhaust chamber can be adjusted by the steam-injected enthalpy-increasing pump 7.

[0057] With the above preferred solution, the injection amount and injection pressure can be controlled by the steam-injected enthalpy-increasing pump 7.

[0058] In order to further optimize the implementation effect of the present invention, in some other embodiments, the remaining characteristic technologies are the same, and the difference lies in that the steam-injected enthalpy-increasing pump 7 is one or more of a variable-speed pump, a constant-speed pump, a metering pump, and a variable-displacement pump.

[0059] With the above preferred solution, it is selected according to specific requirements.

[0060] The above-mentioned multiple embodiments can be implemented in a cross-parallel manner.

[0061] The above-mentioned compressor 1 can be, but is not limited to, a scroll compressor, a rotary compressor, or a screw compressor. Of course, it can also be other types of compressors, and the present invention does not make any limitations.

[0062] For the traditional gas replenishment method, in the working conditions with a particularly large compression ratio, such as when the compression ratio exceeds 10, the gas replenishment amount is insufficient or after the temperature of the gas replenishment passes through heat exchange, the temperature of the gas replenishment is relatively high, and the cooling effect is not obvious. In the heat pump system with a strong steam-injected enthalpy-increasing function of the present invention, the steam-injected enthalpy-increasing pump 7 injects the gaseous refrigerant condensed by the first condenser 2 into the compression chamber of the compressor 1, with a good cooling effect, ensuring the gas replenishment amount and energy efficiency. At the same time, the exhaust temperature is reduced, and the safety factor is higher, producing unexpected beneficial effects.

[0063] Hereinafter, a scroll compressor will be taken as an example for description.

[0064] In some embodiments, when the compressor 1 is a scroll compressor, the compressor includes: a housing, a moving scroll disk, a stationary scroll disk, and a driving assembly. A compression chamber is formed between the moving scroll disk and the stationary scroll disk. The moving scroll disk, the stationary scroll disk, and the driving assembly are arranged in the housing. A refrigerant passage 11 is provided on the stationary scroll disk. One end of the refrigerant passage 11 is communicated with the refrigerant pipe 6, and the other end is communicated with the compression chamber inlet. The refrigerant pipe 6 is connected to the steam-injected enthalpy-increasing pump 7.

[0065] When the compressor is a scroll compressor, the structure is simple, and the refrigerant can be smoothly injected into the compression chamber of the compressor.

[0066] In some other embodiments, when the compressor 1 is a scroll compressor, the compressor includes: a housing, a moving scroll plate, a stationary scroll plate, and a driving assembly. A compression chamber is formed between the moving scroll plate and the stationary scroll plate. The moving scroll plate, the stationary scroll plate, and the driving assembly are disposed within the housing. A refrigerant passage 11 is provided on the stationary scroll plate. One end of the refrigerant passage 11 is connected to the refrigerant pipe 6, and the other end thereof is respectively connected to the compression chamber inlet and the compressor exhaust port. The refrigerant pipe 6 is connected to the jet enthalpy pump 7.

[0067] When the compressor is a scroll compressor, the structure is simple, and the refrigerant can be smoothly pumped into the exhaust chamber of the compressor, resulting in better refrigeration effect.

[0068] Furthermore, the diameter of the refrigerant pipe 6 is not greater than the diameter of the refrigerant passage 11 connected thereto.

[0069] As Figure 2-5 described, furthermore, the refrigerant pipe 6 is connected to the refrigerant passage 11 through a connection assembly 10. The connection assembly 10 includes:

[0070] A first connecting pipe 101. One end of the first connecting pipe 101 is connected to the refrigerant pipe 6 through its internal thread 103, and the other opposite end thereof is connected to the second connecting pipe 102. The inner cavity structure of the first connecting pipe is along the refrigerant transmission direction, and the cross-section of its inner cavity transitions from a circular shape to a flat rectangular shape;

[0071] A second connecting pipe 102 for connecting the first connecting pipe 101 and the refrigerant passage 11.

[0072] Using the above connection assembly 10 can transport the refrigerant to the corresponding compression chamber and / or exhaust chamber more smoothly and quickly.

[0073] Furthermore, the inner wall of the second connecting pipe 102 is smooth and rounded, and the caliber at its outlet is larger than the caliber at its inlet to ensure the smooth transmission of the refrigerant.

[0074] Furthermore, the first connecting pipe 101 and the second connecting pipe 102 are connected through a strengthening assembly 104 to ensure the connection strength between the two.

[0075] In order to better demonstrate the beneficial effects of the heat pump system with a powerful jet enthalpy function of the present invention, the present invention is compared with a common system and a common enthalpy increase system in terms of standard heating performance. The experimental results are shown in Table 1 and Figure 6 as shown.

[0076] Table 1 is a comparison table of the heating performance of three products of the same displacement and different types of a certain brand

[0077]

[0078] Through Table 1 and Figure 6It can be found that under various working conditions, the heating capacity of the heat pump system with a strong steam injection and enthalpy increase function according to the present invention is increased by about 700 W compared with the heating capacity of the ordinary enthalpy increase system, and is increased by more than 5%.

[0079] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement it. It cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A heat pump system with a strong steam enthalpy increase function, characterized in that, Comprising: A first condenser, a second condenser, an evaporator, a first expansion valve, a second expansion valve, a heat exchanger, a compressor, and an injection enthalpy increase pump; The compressor, the first condenser, the heat exchanger, the second expansion valve, the evaporator, and the compressor are connected in sequence to form a first main circuit for completing the refrigeration or heating process; The first condenser is further connected to the injection enthalpy increase pump through the first expansion valve and the heat exchanger, and the injection enthalpy increase pump injects the gaseous refrigerant condensed by the first condenser into the compression chamber of the compressor; The second condenser is connected to the injection enthalpy increase pump, and the injection enthalpy increase pump injects the gaseous refrigerant condensed by the second condenser into the compression chamber of the compressor; The injection enthalpy increase pump can inject the gaseous refrigerant into the exhaust chamber of the compressor, and the exhaust chamber of the compressor is a partial chamber that can communicate with the exhaust passage of the compressor and is close to the compression mechanism of the compressor; The injection amount and injection pressure of the refrigerant injected into the compression chamber and / or the exhaust chamber can be adjusted by the injection enthalpy increase pump; A refrigerant pipe is provided on the compressor, one end of the refrigerant pipe is communicated with the compression chamber of the compressor, and the other opposite end is connected to the injection enthalpy increase pump, and the injection enthalpy increase pump injects the gaseous refrigerant into the compression chamber of the compressor; A pressure gauge and a pressure sensor are provided on the refrigerant pipe, the pressure sensor is connected to the injection enthalpy increase pump, and the injection enthalpy increase pump adjusts its output pressure and flow rate according to the pressure value collected by the pressure sensor and the exhaust pressure of the compressor.

2. The heat pump system with a strong steam enthalpy increase function according to claim 1, characterized in that, The injection enthalpy increase pump is one or more of a variable speed pump, a constant speed pump, a metering pump, and a variable pump.

3. The heat pump system with a strong steam enthalpy increase function according to claim 1, characterized in that The compressor can be a scroll compressor, a rotary compressor, or a screw compressor.

4. The heat pump system with a powerful steam injection enthalpy increase function according to claim 1, characterized in that: When the compressor is a scroll compressor, the scroll compressor includes: a housing, a moving scroll disk, a stationary scroll disk, and a driving assembly. A compression chamber is formed between the moving scroll disk and the stationary scroll disk. The moving scroll disk, the stationary scroll disk, and the driving assembly are arranged in the housing. A refrigerant passage is provided on the stationary scroll disk. One end of the refrigerant passage is communicated with the refrigerant pipe, and the other end is communicated with the inlet of the compression chamber. The refrigerant pipe is connected to the injection enthalpy increase pump.

5. The heat pump system with a strong steam enthalpy increase function according to claim 1, characterized in that, When the compressor is a scroll compressor, the scroll compressor includes: a housing, a moving scroll disk, a stationary scroll disk, and a driving assembly. A compression chamber is formed between the moving scroll disk and the stationary scroll disk. The moving scroll disk, the stationary scroll disk, and the driving assembly are arranged in the housing. A refrigerant passage is provided on the stationary scroll disk. One end of the refrigerant passage is communicated with the refrigerant pipe, and the other end is respectively communicated with the inlet of the compression chamber and the exhaust port of the compressor. The refrigerant pipe is connected to the injection enthalpy increase pump.

Images