R290 high-temperature heat pump system

Abstract

The utility model relates to the technical field of heat pump systems, in particular to an R290 high-temperature heat pump system which comprises a compressor, a first heat exchanger, a throttling heat exchange device and a second heat exchanger which are sequentially connected through pipelines to form a refrigerant loop. When the safety assembly is used, the inner cavity of the second heat exchanger is provided with the first safety assembly, and the first safety assembly is used for detecting whether refrigerant leakage occurs in the inner cavity of the second heat exchanger or not and discharging the leaked refrigerant when the refrigerant leakage occurs; and when the safety system comprises the second safety assembly, the second safety assembly is arranged outside all the pipelines and used for detecting whether refrigerant leakage occurs outside the refrigerant loop or not and eliminating and diffusing the leaked refrigerant when the refrigerant leakage occurs, and through the arrangement of the safety system, the application safety of the R290 high-temperature heat pump can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump systems, in particular to an R290 high-temperature heat pump system. Background Art

[0002] At present, when it comes to producing high-temperature hot water (such as 90°C) at low ambient temperature, cascade heat pump units and heat pump series coupling are usually selected to achieve this (such as R410A / R134A, R32 / R515B, etc.). However, the system and control are complex, energy efficiency and reliability need to be improved, the product price is expensive, and maintenance is difficult. In terms of environmental protection, the GWP value of conventional refrigerants is still relatively large (such as R410A / R134A / R32 / R515B), and more environmentally friendly refrigerants are needed to replace them.

[0003] The existing R290 refrigerant can solve the above problems very well. It is highly environmentally friendly and has a wide range of heat pump operation. The application of R290 system can directly replace the above-mentioned cascade or heat pump coupling system, which has the advantages of higher energy efficiency, simpler maintenance, low cost and more reliable operation.

[0004] However, R290 is a Class A3 refrigerant, which is flammable and explosive. Currently, the application of R290 high-temperature heat pumps is relatively simple, with insufficient safety design and insufficient safety performance. Utility Model Content

[0005] The utility model aims to provide an R290 high-temperature heat pump system, which can improve the safety of R290 high-temperature heat pump application.

[0006] The technical solution of the utility model is achieved in this way:

[0007] An R290 high-temperature heat pump system comprises a compressor, a first heat exchanger, a throttling heat exchange device and a second heat exchanger which are sequentially connected by pipelines to form a refrigerant circuit, wherein the refrigerant circuit is used to circulate R290 refrigerant;

[0008] Also included is a safety system comprising at least one of a first safety component and a second safety component;

[0009] Wherein, when the safety system includes the first safety component, the first safety component is arranged in the inner cavity of the second heat exchanger, and the first safety component is used to detect whether there is refrigerant leakage in the inner cavity of the second heat exchanger and remove the leaked refrigerant when the refrigerant leaks;

[0010] When the safety system includes the second safety component, a second safety component is arranged outside all pipelines to detect whether there is refrigerant leakage outside the refrigerant circuit and to remove and diffuse the leaked refrigerant when the refrigerant leaks.

[0011] Furthermore, it also includes a four-way reversing valve and a gas-liquid separator, and the refrigerant output port of the compressor is connected to the refrigerant input port of the first heat exchanger through the four-way reversing valve, and the refrigerant output port of the second heat exchanger is connected to the first refrigerant input port of the compressor through the four-way reversing valve, and the gas-liquid separator is arranged between the four-way reversing valve and the first refrigerant input port of the compressor.

[0012] Further, the throttling heat exchange device includes an economizer and a main throttling valve;

[0013] The refrigerant outlet of the first heat exchanger is connected to the first refrigerant inlet of the economizer through a pipeline, the first refrigerant outlet of the economizer is connected to the refrigerant inlet of the second heat exchanger through a pipeline, and the main throttle valve is arranged on the pipeline between the economizer and the second heat exchanger.

[0014] Furthermore, the throttling heat exchange device also includes an auxiliary throttling valve;

[0015] The refrigerant outlet of the first heat exchanger is provided with a first branch pipe and a second branch pipe, the refrigerant outlet of the first heat exchanger is connected with the first refrigerant inlet of the economizer through the first branch pipe, the refrigerant outlet of the first heat exchanger is connected with the second refrigerant inlet of the economizer through the second branch pipe, and the auxiliary throttle valve is provided on the second branch pipe, and the second refrigerant outlet of the economizer is connected with the second refrigerant inlet of the compressor through a pipeline.

[0016] Furthermore, it also includes a first water pump, a second water pump and an energy storage water tank;

[0017] The water output port of the first heat exchanger is connected to the first water input port of the energy storage water tank through a pipeline, the first water output port of the energy storage water tank is connected to the use side through the first water pump, the use side is connected to the second water input port of the energy storage water tank through a pipeline, and the second water output port of the energy storage water tank is connected to the water input port of the first heat exchanger through the second water pump.

[0018] Furthermore, it also includes a water replenishment pipeline, which leads to the energy storage water tank.

[0019] Furthermore, the first safety component includes a first exhaust unit and a first sensor, the first sensor is arranged at the bottom of the inner cavity of the second heat exchanger, and is used to detect the concentration of R290 refrigerant, the first exhaust unit is arranged at the top of the cavity of the second heat exchanger, and the first exhaust unit and the first sensor are electrically connected to the central control system respectively.

[0020] Furthermore, it also includes a mounting shell, wherein the compressor, the first heat exchanger, the throttling heat exchange device and the pipes connected therebetween are located inside the mounting shell, and the second heat exchanger is located outside the mounting shell;

[0021] The second safety component includes a second exhaust unit and a second sensor. The second sensor is disposed at the bottom of the mounting shell. The second exhaust unit is mounted on the mounting shell. The second exhaust unit and the second sensor are electrically connected to a central control system respectively.

[0022] Furthermore, when the safety system includes the third safety component, the upper cavity of the energy storage water tank is provided with the third safety component for detecting whether there is refrigerant leakage in the upper cavity of the energy storage water tank and removing the leaked refrigerant when the refrigerant leaks.

[0023] Furthermore, it also includes an audible and visual alarm unit, which is electrically connected to the central control system.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] The present application provides an R290 high-temperature heat pump system, and in the main refrigerant circuit, the flow direction of the R290 refrigerant is: compressor → four-way reversing valve → first heat exchanger → throttling heat exchange device → second heat exchanger → four-way reversing valve → compressor, realizing a closed-loop cycle;

[0026] The invention also includes a safety system, which includes at least one of a first safety component, a second safety component and a third safety component. The first safety component can ensure the safety of the inner cavity of the second heat exchanger, the second safety component can improve the safety outside the system pipeline, and the third safety component can improve the safety inside the upper cavity of the energy storage water tank. No matter which of the first safety component, the second safety component and the third safety component the safety system includes, the system safety can be improved compared with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a schematic diagram of the process of the R290 high temperature heat pump system of the utility model;

[0029] Figure 2 For this utility model Figure 1A partial enlarged view of the structure inside the installation shell.

[0030] In the figure:

[0031] 1- compressor; 2- four-way reversing valve; 3- first heat exchanger;

[0032] 4-economizer; 5-main throttle valve; 6-second heat exchanger;

[0033] 7- auxiliary throttle valve; 8- first branch valve; 9- second branch valve;

[0034] 10-energy storage water tank; 11-first water pump; 12-second water pump;

[0035] 13-water supply pipeline; 14-first exhaust unit; 15-first sensor;

[0036] 16-second exhaust unit; 17-second sensor;

[0037] 18 - the third exhaust unit; 19 - the third sensor; 20 - the gas-liquid separator; 21 - the installation shell. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. 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.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0041] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0042] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0043] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0045] Example

[0046] Reference Figure 1 and Figure 2 This embodiment provides an R290 high temperature heat pump system, comprising a compressor 1, a first heat exchanger 3, a throttling heat exchange device and a second heat exchanger 6 connected in sequence by pipelines to form a refrigerant circuit, wherein the refrigerant circuit is used to circulate R290 refrigerant, that is, the refrigerant in the refrigerant circuit uses R290 refrigerant. Among them, the first heat exchanger 3 is a heat pump water heat exchanger, and the second heat exchanger 6 is an air heat exchanger.

[0047] Specifically, it also includes a four-way reversing valve 2, the refrigerant outlet of the compressor 1 is connected to the refrigerant inlet of the first heat exchanger 3 through the four-way reversing valve 2, the refrigerant outlet of the first heat exchanger 3 is connected to the refrigerant inlet of the throttling heat exchange device through a pipeline, the refrigerant outlet of the throttling heat exchange device is connected to the refrigerant inlet of the second heat exchanger 6 through a pipeline, and the refrigerant outlet of the second heat exchanger 6 is connected to the first refrigerant inlet of the compressor 1 through the four-way reversing valve 2.

[0048] The refrigerant circuit includes a refrigerant main circuit, and in the refrigerant main circuit, the flow direction of the R290 refrigerant is: compressor 1→four-way reversing valve 2→first heat exchanger 3→throttling heat exchange device→second heat exchanger 6→four-way reversing valve 2→compressor 1, realizing a closed-loop cycle; Figure 1 In the figure, the flow direction of R290 in the main refrigerant circuit is shown (direction of arrow).

[0049] In this embodiment, the throttling heat exchange device includes an economizer 4 and a main throttle valve 5; specifically: the refrigerant outlet of the first heat exchanger 3 is connected to the first refrigerant inlet of the economizer 4 through a pipeline, the first refrigerant outlet of the economizer 4 is connected to the refrigerant inlet of the second heat exchanger 6 through a pipeline, and the main throttle valve 5 is arranged on the pipeline between the economizer 4 and the second heat exchanger 6.

[0050] At this time, in the main refrigerant circuit, the flow direction of R290 refrigerant is: compressor 1→four-way reversing valve 2→first heat exchanger 3→economizer 4→main throttle valve 5→second heat exchanger 6→four-way reversing valve 2→compressor 1, realizing the closed-loop circulation of the main refrigerant circuit. Figure 1 In the figure, the flow direction of R290 in the auxiliary refrigerant circuit is shown (arrow direction). Figure 2 The structure is enlarged in the figure. The four-way reversing valve 2 has four interfaces, namely the first interface, the second interface, the third interface and the fourth interface. The refrigerant input port of the compressor 1 is connected to the first interface of the four-way reversing valve 2 through a pipeline, the second interface of the compressor 1 is connected to the refrigerant input port of the first heat exchanger 3 through a pipeline, the refrigerant output port of the second heat exchanger 6 is connected to the third interface of the four-way reversing valve 2 through a pipeline, and the fourth interface of the four-way reversing valve 2 is connected to the first refrigerant input port of the compressor 1 through a pipeline.

[0051] Preferably, a gas-liquid separator 20 is provided between the fourth interface of the four-way reversing valve 2 and the first refrigerant input port of the compressor 1 to achieve gas-liquid separation and improve the purity of R290.

[0052] On this basis, a refrigerant auxiliary circuit is added, that is, the R290 circuit also includes a refrigerant auxiliary circuit, and the throttling heat exchange device also includes an auxiliary throttling valve 7. Specifically, a first branch pipe 8 and a second branch pipe 9 are provided at the refrigerant output port of the first heat exchanger 3, and the refrigerant output port of the first heat exchanger 3 is connected with the first refrigerant input port of the economizer 4 through the first branch pipe 8 (the first branch pipe 8 belongs to the refrigerant main circuit), and the refrigerant output port of the first heat exchanger 3 is connected with the second refrigerant input port of the economizer 4 through the second branch pipe 9 (the second branch pipe 9 belongs to the refrigerant auxiliary circuit), and an auxiliary throttling valve 7 is provided on the second branch pipe 9, and the second refrigerant output port of the economizer 4 is connected with the second refrigerant input port of the compressor 1 through a pipeline.

[0053] In the auxiliary refrigerant circuit, the flow direction of R290 refrigerant is: compressor 1→four-way reversing valve 2→water heat exchanger→auxiliary throttle valve 7→economizer 4→compressor 1.

[0054] Among them, the economizer 4 is a heat exchanger and is used for heat exchange, the main throttle valve 5 is used for throttling on the main refrigerant circuit, and the auxiliary throttle valve 7 is used for throttling on the auxiliary refrigerant circuit.

[0055] Therefore, the R290 high-temperature heat pump system has two operating states, namely the first operating state and the second operating state; when the system is in the first operating state, it is a normal operating state, and the R290 refrigerant circulates only in the main refrigerant circuit; when the system is in the second operating state, the R290 refrigerant circulates in both the main refrigerant circuit and the auxiliary refrigerant circuit. In this operating state, the outlet water temperature is higher, mainly to increase the outlet water temperature for low ambient temperatures. Therefore, through the structural design of the auxiliary refrigerant circuit, a R290 low ambient temperature, high-temperature hot water heat pump system solution is provided.

[0056] Also included is a safety system, the safety system including at least one of a first safety component, a second safety component, and a third safety component;

[0057] Wherein, when the safety system only includes the first safety component, the first safety component is set in the inner cavity of the second heat exchanger 6, and the first safety component is used to detect whether there is refrigerant leakage in the inner cavity of the second heat exchanger 6 and remove the leaked refrigerant when the refrigerant leaks;

[0058] When the safety system only includes the second safety component, the second safety component is arranged outside all pipelines to detect whether there is refrigerant leakage outside the refrigerant circuit and to remove and diffuse the leaked refrigerant when the refrigerant leaks;

[0059] When the safety system only includes the third safety component, the upper cavity of the energy storage water tank 10 is provided with the third safety component for detecting whether there is refrigerant leakage in the upper cavity of the energy storage water tank 10 and removing the leaked refrigerant when the refrigerant leaks.

[0060] In this embodiment, the security system includes a first security component, a second security component and a third security component at the same time, which fully improves the security of the system.

[0061] In this embodiment, the first safety component includes a first exhaust unit 14 and a first sensor 15. The first sensor 15 is arranged at the bottom of the inner cavity of the second heat exchanger 6 and is used to detect the concentration of the R290 refrigerant. The first exhaust unit 14 is arranged at the top of the cavity of the second heat exchanger 6. The first exhaust unit 14 and the first sensor 15 are electrically connected to the central control system respectively. Since the density of R290 is greater than the density of air, the first sensor 15 for detecting the concentration of R390 is arranged at the bottom of the inner cavity of the second heat exchanger 6.

[0062] In this embodiment, a second safety component is set outside all pipelines of the system (including pipelines used to connect various components), mainly for possible leakage of the compressor 1, various pipelines or container cavities. It can detect whether there is refrigerant leakage outside the system pipeline and eliminate and diffuse the leaked refrigerant when it leaks, thereby improving the safety outside the system pipeline.

[0063] Specifically, it also includes an installation shell 21, wherein the compressor 1, the four-way reversing valve 2, the first heat exchanger 3, the throttling heat exchange device, the gas-liquid separator 20 and the pipelines connected therebetween in the heat pump system except the second heat exchanger 6 are all located in the installation shell 21 (such as Figure 1 and Figure 2 ), and the second heat exchanger 6 is located outside the installation shell 21. The second safety component includes a second exhaust unit 16 and a second sensor 17. The second sensor 17 is arranged at the bottom of the installation shell 21 (located at the lowest point of the entire system). The second exhaust unit 16 is installed in the installation shell 21, and the second exhaust unit 16 and the second sensor 17 are electrically connected to the central control system respectively.

[0064] In this embodiment, multiple second sensors 17 can be provided, which are respectively distributed at various positions in the installation shell 21, and are used to detect the concentration of R290 refrigerant outside all system pipelines in the installation shell 21, mainly for possible leakage of the compressor 1, pipelines, and various container cavities in the installation shell 21. Multiple second exhaust units 16 can also be provided, and multiple second exhaust units 16 are provided in a one-to-one correspondence with multiple second sensors 17. All second exhaust units 16 and all second sensors 17 are electrically connected to the central control system respectively. When any second sensor 17 detects R290 leakage, it sends a signal to the central control system (or central controller), and the central control system drives the corresponding second exhaust unit 16 to operate, eliminates the leaked R290, improves the safety outside the system pipeline, and improves the system safety.

[0065] In this embodiment, a third safety component is provided corresponding to the first heat exchanger 3. Specifically, a third safety component is provided in the upper cavity of the energy storage water tank 10, which is used to detect whether there is refrigerant leakage in the upper cavity of the energy storage water tank 10 and to remove the leaked refrigerant when the refrigerant leaks. It is mainly aimed at possible leakage of the first heat exchanger 3. Because when the first heat exchanger 3 leaks, the leaked R290 will enter the upper cavity of the upper part of the energy storage water tank 10 with the water flow, so whether the first heat exchanger 3 is leaking can be indirectly detected.

[0066] Specifically, the third safety component includes a third exhaust unit 18 and a third sensor 19. The third sensor 19 is arranged at the bottom of the upper cavity of the energy storage water tank 10, and is used to detect the concentration of R290 refrigerant in the upper cavity of the energy storage water tank 10. The third exhaust unit 18 is arranged at the top of the upper cavity of the energy storage water tank 10. The third exhaust unit 18 and the third sensor 19 are electrically connected to the central control system respectively.

[0067] In a preferred implementation of this embodiment, fans are used for the first exhaust unit 14, the second exhaust unit 16 and the third exhaust unit 18. The system also includes an audible and visual alarm unit, which uses an audible and visual alarm, and the audible and visual alarm is electrically connected to the central control system.

[0068] The first safety component, the second safety component and the third safety component in the system together constitute a safety system. The working principle of the safety system is: it is used to detect the concentration of R290. When the detected concentration is greater than the target value, the sound and light alarm is immediately activated and the fan is started at maximum operation to ensure the safety of the system. The safety system can operate independently and transmit to the central control system. This system design is suitable for high-temperature hot water demand scenarios with large heat demand.

[0069] When the first sensor 15 detects R290 leakage, it sends a signal to the central control system, and the central control system sends a command to the sound and light alarm to sound and light alarm, and at the same time sends a command to the first exhaust unit 14 to operate at maximum power and use the fan to remove the leaked R290.

[0070] When the second sensor 17 detects R290 leakage, it sends a signal to the central control system, and the central control system sends a command to the sound and light alarm to sound and light alarm, and at the same time sends a command to the second exhaust unit 16 to operate at maximum power and use the fan to remove the leaked R290.

[0071] When the third sensor 19 detects R290 leakage, it sends a signal to the central control system, and the central control system sends a command to the sound and light alarm to sound and light alarm, and at the same time sends a command to the third exhaust unit 18 to operate at maximum power and use the fan to remove the leaked R290.

[0072] This application utilizes a safety system to detect, alarm, and quickly eliminate R290, and the triple safety design ensures the safe operation of the system.

[0073] The system also includes a first water pump 11, a second water pump 12 and an energy storage water tank 10; the water output port of the first heat exchanger 3 is connected to the first water input port of the energy storage water tank 10 through a pipeline, the first water output port of the energy storage water tank 10 is connected to the use side through the first water pump 11, the use side is connected to the second water input port of the energy storage water tank 10 through a pipeline, and the second water output port of the energy storage water tank 10 is connected to the water input port of the first heat exchanger 3 through the second water pump 12.

[0074] It should be noted here that the energy storage water tank 10 provides hot water to the user side (user), and there are many ways for the user side to use it. When the user side does not consume water (such as using floor heating, etc.), the hot water in the energy storage water tank 10 returns to the energy storage water tank 10 after passing through the user side, completing the water circuit cycle. Specifically, when the energy storage water tank 10 supplies water, the first water pump 11 supplies the hot water in the energy storage water tank 10 to the user side; after the water on the user side returns to the energy storage water tank 10, the water returned to the energy storage water tank 10 is pumped to the first heat exchanger 3 for heat exchange under the action of the second water pump 12. After the water is heat exchanged, it continues to be pushed into the energy storage water tank 10 from the second water body input port of the energy storage water tank 10 under the thrust of the second water pump 12. When the use side needs to consume water (such as showering, washing, etc.), a water replenishment pipeline 13 is also provided in the system. The water replenishment pipeline 13 leads to the energy storage water tank 10. The water replenishment pump provides the water in the water replenishment tank to the energy storage water tank 10 through the water replenishment pipeline 13, so that the water in the energy storage water tank 10 always remains stable.

[0075] The beneficial effects of the technical solution of the utility model are:

[0076] 1. In view of the problems that the conventional cascade system for producing high-temperature hot water at low ambient temperature in the prior art is more complicated, more expensive, and has room for improvement in energy efficiency and operational reliability, the R290 high-temperature heat pump system provided in this application can produce 90°C high-temperature hot water at low ambient temperature. The system is simpler, more compact, lower in cost and more reliable in operation;

[0077] 2. In view of the problem that the environmental protection of refrigerants in the existing technology still needs to be improved, this system adopts environmentally friendly refrigerant R290, which has more environmentally friendly characteristics;

[0078] 3. In view of the problem that the R290 high-temperature heat pump in the prior art is relatively simple to apply, has insufficient safety design, and is not suitable for large-calorie heat pump applications, the solution of this application focuses on safety design, which can meet the needs of high-temperature heat pumps with large heat, large-heat fixed air outlet design, and triple safety design of the safety system to ensure safe operation of the system.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

[0080] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An R290 high temperature heat pump system, characterized in that: It comprises a compressor (1), a first heat exchanger (3), a throttling heat exchange device and a second heat exchanger (6) which are sequentially connected by pipelines to form a refrigerant circuit, wherein the refrigerant circuit is used to circulate R290 refrigerant; Also included is a safety system comprising at least one of a first safety component and a second safety component; Wherein, when the safety system includes the first safety component, the first safety component is arranged in the inner cavity of the second heat exchanger (6), and the first safety component is used to detect whether there is refrigerant leakage in the inner cavity of the second heat exchanger (6) and to remove the leaked refrigerant when the refrigerant leaks; When the safety system includes the second safety component, a second safety component is arranged outside all pipelines to detect whether there is refrigerant leakage outside the refrigerant circuit and to remove and diffuse the leaked refrigerant when the refrigerant leaks.

2. The R290 high temperature heat pump system according to claim 1, characterized in that: It also includes a four-way reversing valve (2) and a gas-liquid separator (20), and the refrigerant output port of the compressor (1) is connected to the refrigerant input port of the first heat exchanger (3) through the four-way reversing valve (2), and the refrigerant output port of the second heat exchanger (6) is connected to the first refrigerant input port of the compressor (1) through the four-way reversing valve (2), and the gas-liquid separator (20) is arranged between the four-way reversing valve (2) and the first refrigerant input port of the compressor (1).

3. The R290 high temperature heat pump system according to claim 1, characterized in that: The throttling heat exchange device comprises an economizer (4) and a main throttling valve (5); The refrigerant output port of the first heat exchanger (3) is connected to the first refrigerant input port of the economizer (4) via a pipeline, the first refrigerant output port of the economizer (4) is connected to the refrigerant input port of the second heat exchanger (6) via a pipeline, and the main throttle valve (5) is arranged on the pipeline between the economizer (4) and the second heat exchanger (6).

4. The R290 high temperature heat pump system according to claim 3, characterized in that: The throttling heat exchange device also includes an auxiliary throttling valve (7); The refrigerant outlet of the first heat exchanger (3) is provided with a first branch pipe (8) and a second branch pipe (9); the refrigerant outlet of the first heat exchanger (3) is connected to the first refrigerant inlet of the economizer (4) through the first branch pipe (8); the refrigerant outlet of the first heat exchanger (3) is connected to the second refrigerant inlet of the economizer (4) through the second branch pipe (9); the auxiliary throttle valve (7) is provided on the second branch pipe (9); the second refrigerant outlet of the economizer (4) is connected to the second refrigerant inlet of the compressor (1) through a pipeline.

5. The R290 high temperature heat pump system according to claim 1, characterized in that: It also includes a first water pump (11), a second water pump (12) and an energy storage water tank (10); The water output port of the first heat exchanger (3) is connected to the first water input port of the energy storage water tank (10) via a pipeline; the first water output port of the energy storage water tank (10) is connected to the use side via the first water pump (11); the use side is connected to the second water input port of the energy storage water tank (10) via a pipeline; the second water output port of the energy storage water tank (10) is connected to the water input port of the first heat exchanger (3) via the second water pump (12).

6. The R290 high temperature heat pump system according to claim 5, characterized in that: It also includes a water replenishment pipeline (13), wherein the water replenishment pipeline (13) leads to the energy storage water tank (10).

7. The R290 high temperature heat pump system according to claim 1, characterized in that: The first safety component comprises a first exhaust unit (14) and a first sensor (15); the first sensor (15) is arranged at the bottom of the inner cavity of the second heat exchanger (6) and is used to detect the concentration of the R290 refrigerant; the first exhaust unit (14) is arranged at the top of the cavity of the second heat exchanger (6); the first exhaust unit (14) and the first sensor (15) are respectively electrically connected to a central control system.

8. The R290 high temperature heat pump system according to claim 1, characterized in that: It also comprises a mounting shell (21), wherein the compressor (1), the first heat exchanger (3), the throttling heat exchange device and the pipelines connecting them are located inside the mounting shell (21), and the second heat exchanger (6) is located outside the mounting shell (21); The second safety component comprises a second exhaust unit (16) and a second sensor (17); the second sensor (17) is arranged at the bottom of the mounting shell (21); the second exhaust unit (16) is mounted on the mounting shell (21); and the second exhaust unit (16) and the second sensor (17) are respectively electrically connected to a central control system.

9. The R290 high temperature heat pump system according to claim 5, characterized in that: The safety system also includes a third safety component, which is arranged in the upper cavity of the energy storage water tank (10) and is used to detect whether there is refrigerant leakage in the upper cavity of the energy storage water tank (10) and to remove the leaked refrigerant when the refrigerant leaks.

10. The R290 high temperature heat pump system according to claim 1, characterized in that: It also includes an audible and visual alarm unit, which is electrically connected to the central control system.

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