Method for starting a heat pump system and heat pump system

Abstract

The present application relates to the technical field of heat pump system, and more particularly to a heat pump system starting method and a heat pump system. The heat pump system starting method comprises detecting an ambient temperature, detecting a shutdown time T1 of a compressor, starting a compressor stator heating mode when the ambient temperature is less than or equal to 25 DEG C and the shutdown time T1 of the compressor is greater than 0.5 h, detecting and recording a cavity temperature T3s of the compressor before the compressor stator heating mode is started, detecting a cavity temperature T3r of the compressor again every first preset time interval, calculating a cavity temperature change value AT3 of the compressor, AT3 = T3r-T3s, and determining whether to exit the compressor stator heating mode; and the compressor stator heating mode is exited when the cavity temperature change value AT3 of the compressor and / or a stator heating time T2 meet a preset condition. The heat pump system starting method can improve the stability and reliability of the heat pump system, prolong the service life, save costs, improve work efficiency, and improve the experience of customers.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump systems, in particular to a heat pump system starting method and a heat pump system. BACKGROUND

[0002] Currently, during the period from production completion to customer installation and use, or after the heat pump product has been stopped for a long time, a large amount of refrigerant will migrate to the compressor due to the migration of refrigerant in the heat pump system. When the heat pump system is started, liquid hammer or lubricating oil dilution will easily occur, which will cause bearing wear and damage the compressor, shorten the service life of the heat pump product, and increase the cost.

[0003] At present, the conventional method is to set a heating belt at the bottom of the compressor to preheat the cavity of the compressor. Since the temperature of the heat pump product environment is usually low, the power of the heating belt in the prior art is small, and it is difficult to evaporate the refrigerant migrated to the cavity of the compressor in a short time. In order to ensure the reliability of the heat pump system, a long heating time may be required, which reduces the work efficiency and the customer experience; if the heating time is not enough, the stable operation of the heat pump system cannot be guaranteed, the service life of the heat pump system is shortened, and the cost is increased.

[0004] Therefore, it is urgent to design a heat pump system starting method and a heat pump system to solve the above technical problems. SUMMARY

[0005] The first object of the present application is to provide a heat pump system starting method, which can improve the stability and reliability of the heat pump system operation, prolong the service life, save the cost, improve the work efficiency, and improve the customer experience.

[0006] To achieve this object, the present application adopts the following technical solutions:

[0007] The present application provides a heat pump system starting method, comprising:

[0008] detecting the ambient temperature;

[0009] detecting the downtime T1 of the compressor;

[0010] when the ambient temperature is ≤25℃ and the downtime T1 of the compressor is >0.5h, starting the compressor stator heating mode, and the stator heating time is T2, T1 and T2 satisfy the following relationship:

[0011] when 0.5h≤T1≤2h, T2=(2*T1) / 60min; when T1>2h, T2=4min;

[0012] Detect and record the cavity temperature of the compressor before starting the compressor stator heating mode as T3s, detect the cavity temperature of the compressor again every first preset time as T3r, calculate the cavity temperature change value of the compressor ΔT3, ΔT3=T3r-T3s;

[0013] Judge whether to exit the compressor stator heating mode;

[0014] When the cavity temperature change value of the compressor ΔT3 and / or the stator heating time T2 meets the preset condition, the compressor stator heating mode is exited.

[0015] As an optional technical solution of the heat pump system starting method, the preset condition comprises:

[0016] When the cavity temperature change value of the compressor ΔT3≥the first preset temperature, and the actual stator heating time≥the theoretical stator heating time, the compressor stator heating mode is exited; the theoretical stator heating time is the stator heating time T2.

[0017] As an optional technical solution of the heat pump system starting method, the first preset temperature is set to 0.5℃.

[0018] As an optional technical solution of the heat pump system starting method, the preset condition further comprises: when the cavity temperature change value of the compressor ΔT3≥the second preset temperature, the compressor stator heating mode is exited.

[0019] As an optional technical solution of the heat pump system starting method, the second preset temperature is set to 3℃.

[0020] As an optional technical solution of the heat pump system starting method, the preset condition further comprises: when the actual stator heating time≥twice the theoretical stator heating time, the compressor stator heating mode is exited; the theoretical stator heating time is the stator heating time T2.

[0021] As an optional technical solution of the heat pump system starting method, the first preset time is set to 5s.

[0022] As an optional technical solution of the heat pump system starting method, the condition of starting the compressor stator heating mode further comprises judging whether the heat pump system has a shutdown fault, and the compressor stator heating mode can be started only when the heat pump system has no shutdown fault and receives a starting instruction.

[0023] The second object of the application is to provide a heat pump system, which has high stability and reliability, prolongs the service life of the heat pump system, saves costs, improves work efficiency, and improves the experience of customers.

[0024] To achieve the object, the application adopts the following technical solutions:

[0025] The application provides a heat pump system adopting the heat pump system starting method, the heat pump system comprising a compressor, the compressor comprising a cavity, a temperature sensor being arranged in the cavity, and the temperature sensor being used for detecting the cavity temperature of the compressor.

[0026] As an optional technical scheme of the heat pump system, the temperature sensor is arranged at the middle part of the cavity.

[0027] The application has at least the following beneficial effects:

[0028] The application provides a heat pump system starting method, which is simple in steps, and judges whether the refrigerant migrated in the cavity of the compressor has been evaporated and heated away by judging the shutdown time T1 of the compressor, the stator heating time T2 and the cavity temperature change value DT3 of the compressor. The refrigerant in the cavity of the compressor is evaporated away quickly through the stator heating mode, so that the stability and reliability of the compressor operation are ensured, the service life of the heat pump system is prolonged, and the cost is saved. The problems of energy waste and long heating time caused by electric heating of the compressor cavity through the heating belt in the prior art are avoided, the heating time is saved, the work efficiency is improved, and the experience of customers is improved.

[0029] The application also provides a heat pump system, which is high in stability and reliability, prolongs the service life of the heat pump system, saves the cost, improves the work efficiency, and improves the experience of customers. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the description of the embodiments of the application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the contents of the embodiments of the application and the drawings.

[0031] Figure 1 The flowchart of the heat pump system starting method provided by the embodiments of the application is shown. DETAILED DESCRIPTION

[0032] In order to make the technical problems solved by the application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the application will be further described below with reference to the drawings and through specific embodiments.

[0033] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise explicitly specified and limited, "on" or "under" the first feature of the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] In the description of the present embodiment, the terms "up", "down", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in description and have no special meaning.

[0036] The present embodiment provides a heat pump system starting method, which is simple in steps, can improve the stability and reliability of the heat pump system operation, prolong the service life of the heat pump system, save cost, improve work efficiency, and improve the experience of customers.

[0037] As shown in Figure 1 The heat pump system starting method of the present embodiment mainly includes the following steps:

[0038] Detect the ambient temperature. Specifically, a thermometer for detecting the ambient temperature is arranged in the heat pump system, which can detect the ambient temperature in real time and feed back the ambient temperature to the control mainboard.

[0039] Detect the shutdown time T1 of the compressor.

[0040] Judge whether to enter the compressor stator heating mode: specifically,

[0041] When the ambient temperature is ≤25℃ and the compressor downtime T1>0.5h, the compressor stator heating mode is started, and the stator heating time is T2, T1and T2satisfy the following relationship: when 0.5h≤T1≤2h, T2=(2*T1) / 60min; when T1>2h, T2=4min. It should be noted that the unit of the compressor downtime T1in the embodiment is usually hours (h), and the unit of the stator heating time T2is usually minutes (min).

[0042] Specifically, when the downtime of the compressor is less than 0.5h, the compressor stator heating mode does not need to be started at this time, that is, the cavity of the compressor does not need to be heated, and the heat pump system can be started directly after receiving the start command and without downtime failure. Alternatively, when the ambient temperature is greater than 25℃, the compressor stator heating mode also does not need to be started at this time, and at this time, it can be defaulted that the refrigerant in the compressor cavity can evaporate naturally at the ambient temperature.

[0043] When the downtime of the compressor T1is between 0.5h and 2h, and the ambient temperature is ≤25℃, the compressor stator heating mode is started, and the stator heating time T2is 2 times the downtime of the compressor T1, to ensure that the refrigerant in the compressor cavity is completely evaporated, to avoid the phenomenon of liquid strike after the compressor is started, and to ensure the safety of the compressor. Of course, the working personnel can also set the relationship between the downtime of the compressor T1and the stator heating time T2according to the actual situation, and it is not limited to the relationship in the embodiment, for example, the stator heating time T2may be set to 1.5 times, 2.5 times, 3 times, etc. of the downtime of the compressor T1, and the like, which will not be described here.

[0044] When the downtime of the compressor is greater than 2h, the stator heating time T2is fixed at 4min, that is, when the compressor is powered on for the first time, the stator heating time T2is set to 4min, which can save time and improve work efficiency on the premise of ensuring that the refrigerant in the compressor cavity is evaporated. Of course, the working personnel can also flexibly set the value of the stator heating time T2when the downtime of the compressor is greater than 2h according to the actual needs, and the embodiment will not be described in detail.

[0045] The condition for starting the compressor stator heating mode also includes judging whether the heat pump system has downtime failure, and the compressor stator heating mode can be started only when the heat pump system has no downtime failure and receives the start command.

[0046] The compressor stator heating mode in the embodiment can give a command through the control mainboard, and excitation current is passed to the stator winding of the compressor, so that the compressor stator heating mode can be entered, and the heating effect can be adjusted by changing the size of the current in the stator.

[0047] In the above embodiment, the ambient temperature value and the compressor shutdown time are acquired, and it is determined whether to start the compressor stator heating mode. Since the stator is a component inside the compressor, the compressor stator heating mode will not fail as long as the compressor can operate normally. In addition, compared with the electric heating belt, the stator heating has smaller restrictions on temperature and power, and can improve the heating efficiency.

[0048] The cavity temperature of the compressor before starting the compressor stator heating mode is detected and recorded as T3s, and the cavity temperature of the compressor is detected again every first preset time to obtain T3r. The cavity temperature change value ΔT3 of the compressor (i.e., the cavity temperature rise of the compressor) is calculated as ΔT3=T3r-T3s.

[0049] Optionally, the first preset time can be set to 5s, 10s, 20s, 30s, etc.

[0050] It is determined whether to exit the compressor stator heating mode.

[0051] When the cavity temperature change value ΔT3 of the compressor and / or the stator heating time T2 meets the preset condition, the compressor stator heating mode is exited.

[0052] Specifically, optionally, the preset condition includes that when the cavity temperature change value ΔT3 of the compressor is greater than or equal to a first preset temperature, and the actual stator heating time is greater than or equal to a theoretical stator heating time, the compressor stator heating mode is exited; the theoretical stator heating time is the stator heating time T2.

[0053] Optionally, the first preset temperature can be set to 0.5°C.

[0054] When the cavity temperature change value ΔT3 of the compressor is greater than or equal to 0.5°C, and at the same time the stator heating time has reached the above-mentioned stator heating time T2, that is, when the above-mentioned two conditions are met at the same time, the heat pump system defaults that the refrigerant in the compressor cavity has evaporated, and at this time the heat pump system exits the compressor stator heating mode.

[0055] Optionally, the preset condition further includes that when the cavity temperature change value ΔT3 of the compressor is greater than or equal to a second preset temperature, the compressor stator heating mode is exited. The second preset temperature can be set to 3°C. That is, when the cavity temperature change value ΔT3 of the compressor is greater than or equal to 3°C, the heat pump system defaults that the refrigerant in the compressor cavity has evaporated, and at this time the heat pump system exits the compressor stator heating mode.

[0056] Optionally, the preset conditions further include exiting the compressor stator heating mode when the actual stator heating time is greater than or equal to twice the theoretical stator heating time; the theoretical stator heating time is the stator heating time T2. That is, when the actual stator heating time is greater than or equal to 2*theoretical stator heating time, the heat pump system defaults that the refrigerant in the compressor cavity has evaporated, and at this time the heat pump system exits the compressor stator heating mode.

[0057] It should be noted that in the present embodiment, as long as one of the above three preset conditions is met, the heat pump system exits the compressor stator heating mode at this time.

[0058] Compared with the prior art, the heat pump system starting method in the present embodiment is simple in steps, and by judging the compressor downtime T1, the stator heating time T2 and the cavity temperature change value AT3 of the compressor, it is further judged whether the refrigerant migrated in the cavity of the compressor has been evaporated and heated. The refrigerant in the compressor cavity is quickly evaporated by the stator heating mode, which guarantees the stability and reliability of the compressor operation, prolongs the service life of the heat pump system, and saves costs. The problem of energy waste and long heating time caused by electric heating of the compressor cavity by the heating belt in the prior art is avoided, the heating time is saved, the work efficiency is improved, and the customer experience is improved.

[0059] The present embodiment also provides a heat pump system, which is started by the above-mentioned heat pump system starting method. The heat pump system mainly comprises a compressor, and the compressor comprises a cavity, and a temperature sensor is arranged in the cavity, and the temperature sensor is used to detect the cavity temperature of the compressor.

[0060] Further, the temperature sensor is arranged at the middle part of the cavity, which is conducive to improving the accuracy of the temperature sensor in detecting the cavity temperature of the compressor and improving the work efficiency.

[0061] The heat pump system has high stability and reliability, can reduce or avoid the occurrence of liquid strike of the compressor, prolong the service life of the heat pump system, save costs, improve work efficiency, and improve customer experience.

[0062] Obviously, the above only describes the preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

[0063] Note that, in describing the present application, the description of the terms "some embodiments," "other embodiments," etc. means that the particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. Such descriptions are not necessarily referring to the same embodiment or example. Furthermore, the described features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A method of starting a heat pump system, characterized by, The method comprises: detecting an ambient temperature; detecting a shutdown time T1 of the compressor; starting a compressor stator heating mode when the ambient temperature is ≤25℃ and the shutdown time T1 of the compressor is >0.5h, and a stator heating time is T2, T1 and T2 satisfy the following relationship: T2=(2*T1) / 60min when 0.5h≤T1≤2h, and T2=4min when T1>2h; detecting and recording a cavity temperature T3s of the compressor before starting the compressor stator heating mode, detecting a cavity temperature T3r of the compressor again every first preset time, calculating a cavity temperature change value ΔT3 of the compressor, ΔT3=T3r-T3s; judging whether to exit the compressor stator heating mode; exiting the compressor stator heating mode when the cavity temperature change value ΔT3 of the compressor, and / or the stator heating time T2 satisfies a preset condition.

2. The heat pump system starting method according to claim 1, characterized by, The preset condition comprises: exiting the compressor stator heating mode when the cavity temperature change value ΔT3 of the compressor is ≥a first preset temperature, and an actual stator heating time is ≥a theoretical stator heating time; the theoretical stator heating time is the stator heating time T2.

3. The heat pump system starting method according to claim 2, wherein The first preset temperature is set to 0.5℃.

4. The heat pump system starting method according to claim 1, wherein The preset condition further comprises: exiting the compressor stator heating mode when the cavity temperature change value ΔT3 of the compressor is ≥a second preset temperature.

5. The heat pump system starting method according to claim 4, wherein The second preset temperature is set to 3℃.

6. The heat pump system starting method according to claim 1, wherein The preset condition further comprises: exiting the compressor stator heating mode when the actual stator heating time is ≥twice the theoretical stator heating time; the theoretical stator heating time is the stator heating time T2.

7. The heat pump system starting method according to claim 1, wherein The first preset time is set to 5s.

8. The heat pump system starting method according to claim 1, wherein The condition for starting the compressor stator heating mode further comprises judging whether the heat pump system has a shutdown fault, and starting the compressor stator heating mode if the heat pump system has no shutdown fault and receives a start-up instruction.

9. Heat pump system, characterized in that The heat pump system adopts the heat pump system starting method according to any one of claims 1-8, the heat pump system comprises a compressor, the compressor comprises a cavity, a temperature sensor is arranged in the cavity, and the temperature sensor is used for detecting a cavity temperature of the compressor.

10. The heat pump system of claim 9, wherein, The temperature sensor is arranged in a middle part of the cavity.

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