阅读说明：本技术 一种电子膨胀阀控制系统及控制方法 (Electronic expansion valve control system and control method ) 是由 谈达伟 仇春伟 黄道德 王福龙 黄创寿 于 2021-10-11 设计创作，主要内容包括：本发明涉及控制阀体技术领域,具体涉及一种电子膨胀阀控制系统及控制方法。包括热泵组件、第一检测组件和第二检测组件,热泵组件执行热泵循环过程,其包括依次连接的压缩机、第一换热器,电子膨胀阀,第二换热器；第一检测组件获取回气过热度,电子膨胀阀根据回气过热度获得初始的节流开度；第二检测组件适于获取排气过热度,电子膨胀阀根据排气过热度进行自动补偿,调整节流开度。该控制系统使机组一方面能对工况变化做出及时响应,同时也降低对工况进行响应的波动程度,通过自动补偿将电子膨胀阀开度的波动范围控制在一定范围内,使机组在工况变化的情况下稳定工作,提高了机组对各种工况的适应能力,使得机组稳定性好,能效高。(The invention relates to the technical field of control valve bodies, in particular to an electronic expansion valve control system and a control method. The heat pump component executes a heat pump circulation process and comprises a compressor, a first heat exchanger, an electronic expansion valve and a second heat exchanger which are sequentially connected; the first detection component acquires the return air superheat degree, and the electronic expansion valve acquires the initial throttle opening according to the return air superheat degree; the second detection component is suitable for acquiring the exhaust superheat degree, and the electronic expansion valve performs automatic compensation according to the exhaust superheat degree and adjusts the throttle opening degree. The control system enables the unit to respond to the change of the working condition in time on the one hand, and simultaneously reduces the fluctuation degree of responding to the working condition, controls the fluctuation range of the opening of the electronic expansion valve in a certain range through automatic compensation, enables the unit to work stably under the condition of the change of the working condition, improves the adaptability of the unit to various working conditions, and enables the unit to be good in stability and high in energy efficiency.)

1. An electronic expansion valve control system, comprising:

the heat pump assembly is suitable for executing a heat pump cycle process and comprises a compressor (1), a first heat exchanger (2), an electronic expansion valve (3) and a second heat exchanger (4) which are connected in sequence;

the first detection component is suitable for acquiring the return air superheat degree, and the electronic expansion valve (3) acquires the initial throttle opening according to the return air superheat degree;

and the second detection component is suitable for acquiring the exhaust superheat degree, and the electronic expansion valve (3) performs automatic compensation according to the exhaust superheat degree and adjusts the throttle opening.

2. The electronic expansion valve control system according to claim 1, wherein the first detection assembly comprises a return air temperature sensing head (5), the return air temperature sensing head (5) being provided at a return air port of the compressor (1).

3. The electronic expansion valve control system according to claim 1, wherein the first heat exchanger (2) is a plate heat exchanger and the second heat exchanger (4) is a fin heat exchanger.

4. The electronic expansion valve control system of claim 3, wherein the second sensing assembly comprises:

the exhaust temperature sensing head (6) is arranged at an exhaust port of the compressor (1) and is suitable for acquiring exhaust temperature;

the fin temperature sensing head (7) is arranged on the second heat exchanger (4) and is suitable for acquiring the temperature of the fins;

and the temperature sensing head (8) behind the valve is arranged between the electronic expansion valve (3) and the first heat exchanger (2) and is suitable for acquiring the temperature behind the valve.

5. A control method, comprising:

s1, acquiring a target return air superheat degree according to the current environment temperature and water temperature;

s2, setting an initial throttle opening according to the target return air superheat degree;

and S3, carrying out automatic compensation according to the exhaust superheat degree, and adjusting the throttle opening degree.

6. The control method according to claim 5, characterized in that, in step S3, the degree of superheat of exhaust gas is adjusted by adjusting the target degree of superheat of return gas to thereby adjust the throttle opening degree at the time of automatic compensation.

7. The control method according to claim 6, characterized in that when the exhaust superheat degree is higher than a set threshold value, the current return superheat degree is adjusted to be low; and when the exhaust superheat degree is lower than a set threshold value, the current return air superheat degree is increased.

8. The control method according to any one of claims 5 to 7, wherein the degree of superheat of the exhaust gas is a difference between an exhaust gas temperature and a fin temperature when a refrigeration cycle is performed; when the heating cycle is executed, the exhaust superheat degree is the difference between the exhaust temperature and the post-valve temperature.

Technical Field

The invention relates to the technical field of control valve bodies, in particular to an electronic expansion valve control system and a control method.

Background

The electronic expansion valve is used as a throttling element and applied to an air energy heat refrigerating system and a heating system, and the flow of the refrigerant is controlled by controlling the opening degree of the electronic expansion valve so as to achieve the optimal refrigerating effect or heating effect.

The existing electronic expansion valve obtains a target superheat degree through an upper computer, and the electronic expansion valve adjusts the opening degree of the electronic expansion valve according to the target superheat degree, so that the operation control of the electronic expansion valve is realized. The target degree of superheat here may be the degree of superheat of return air, or the degree of superheat of exhaust air. When the control is carried out by singly using the return air superheat degree, the condition that the working condition of the unit is changed, such as in mass production or when the environment is changed, the system refrigerant flow and the flow distribution reach the preset return air superheat degree or the exhaust superheat degree cannot be ensured. In other words, the return air superheat degree cannot adapt to the working condition change in real time, the instantaneity of the control of the electronic expansion valve is poor, the performance of the unit cannot be normally exerted, and the refrigerating or heating effect is poor.

When the control is performed by singly using the exhaust superheat degree, the exhaust superheat degree fluctuates greatly along with the working condition when the working condition of the unit changes, in other words, the accuracy of the control of the electronic expansion valve is poor, so that the performance of the unit cannot be normally exerted, and the refrigerating or heating effect is poor.

Disclosure of Invention

The invention provides an electronic expansion valve control system and a control method, which aim to solve the problems that the unit performance cannot be normally exerted and the heating effect is poor under the condition that the working condition of the electronic expansion valve control in the prior art is changed.

The technical scheme of the invention is as follows:

an electronic expansion valve control system comprising: the heat pump component is suitable for executing a heat pump circulation process and comprises a compressor, a first heat exchanger, an electronic expansion valve and a second heat exchanger which are sequentially connected; the first detection component is suitable for acquiring the return air superheat degree, and the electronic expansion valve acquires the initial throttle opening according to the return air superheat degree; the second detection component is suitable for obtaining the exhaust superheat degree, and the electronic expansion valve carries out automatic compensation according to the exhaust superheat degree and adjusts the throttle opening degree.

Preferably, the first detection assembly comprises an air-return temperature sensing head, and the air-return temperature sensing head is arranged at an air-return port of the compressor;

preferably, the first heat exchanger is a plate heat exchanger, and the second heat exchanger is a fin heat exchanger.

Preferably, the second detection assembly comprises: the exhaust temperature sensing head is arranged at an exhaust port of the compressor and is suitable for acquiring exhaust temperature; the fin temperature sensing head is arranged on the second heat exchanger and is suitable for acquiring the temperature of the fins; the temperature sensing head behind the valve is arranged between the electronic expansion valve and the first heat exchanger and is suitable for acquiring the temperature behind the valve.

A control method, comprising:

s1, acquiring a target return air superheat degree according to the current environment temperature and water temperature;

s2, setting an initial throttle opening according to the target return air superheat degree;

and S3, carrying out automatic compensation according to the exhaust superheat degree, and adjusting the throttle opening degree.

Preferably, in the step S3, the throttle opening degree is adjusted by adjusting the target degree of superheat of the return air.

Preferably, when the exhaust superheat degree is higher than a set threshold value, the current return air superheat degree is reduced; and when the exhaust superheat degree is lower than a set threshold value, the current return air superheat degree is increased.

Preferably, when a refrigeration cycle is executed, the exhaust superheat degree is the difference between the exhaust temperature and the fin temperature; when the heating cycle is executed, the exhaust superheat degree is the difference between the exhaust temperature and the post-valve temperature.

The technical scheme of the invention has the following advantages:

the electronic expansion valve control system of the invention comprises: the heat pump component is suitable for executing a heat pump circulation process and comprises a compressor, a first heat exchanger, an electronic expansion valve and a second heat exchanger which are sequentially connected; the first detection component is suitable for acquiring the return air superheat degree, and the electronic expansion valve acquires the initial throttle opening according to the return air superheat degree; the second detection component is suitable for acquiring the exhaust superheat degree, and the electronic expansion valve performs automatic compensation according to the exhaust superheat degree and adjusts the throttle opening degree.

When the device works, the return air superheat degree is taken as the main part, and the exhaust superheat degree is monitored at the same time. When the unit is under the condition that the working condition changes, the return air superheat degree is compensated in real time through the exhaust superheat degree. The control stability of the electronic expansion valve is ensured by the superheat degree of the return air, the opening degree of the electronic expansion valve cannot fluctuate greatly, and the unit works stably; the exhaust superheat degree is used for automatically compensating the return air superheat degree in real time, the electronic expansion valve can adjust the throttle opening degree in real time according to the working condition change, and the real-time performance and the accuracy of the control of the electronic expansion valve are guaranteed.

Compared with the control by singly controlling the return air superheat degree or the exhaust superheat degree, the electronic expansion valve control system disclosed by the invention has the advantages that on one hand, the unit can respond to the working condition change in time, meanwhile, the fluctuation degree of the response to the working condition is also reduced, the fluctuation range of the opening degree of the electronic expansion valve is controlled within a certain range through automatic compensation, the unit can stably work under the condition of the working condition change, the adaptability of the unit to various working conditions is improved, and the unit is good in stability and high in energy efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of the electronic expansion valve control system of the present invention in a cooling mode;

FIG. 2 is a schematic view of the electronic expansion valve control system of the present invention in a heating mode;

fig. 3 is a flowchart of a control method of the present invention.

Description of reference numerals:

1-a compressor; 2-a first heat exchanger; 3-an electronic expansion valve; 4-a second heat exchanger; 5-return air temperature sensing head; 6-exhaust temperature sensing head; 7-fin temperature sensing head; 8-temperature sensing head behind the valve.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example one

The present embodiment provides an electronic expansion valve control system, as shown in fig. 1 to 3, including: the heat pump comprises a heat pump component, a first detection component and a second detection component, wherein the heat pump component is suitable for executing a heat pump circulation process and comprises a compressor 1, a first heat exchanger 2, an electronic expansion valve 3 and a second heat exchanger 4 which are connected in sequence; the first detection component is suitable for acquiring the return air superheat degree, and the electronic expansion valve 3 acquires the initial throttle opening according to the return air superheat degree; the second detection component is suitable for obtaining the exhaust superheat degree, and the electronic expansion valve 3 carries out automatic compensation according to the exhaust superheat degree and adjusts the throttle opening degree.

When the device works, the return air superheat degree is taken as the main part, and the exhaust superheat degree is monitored at the same time. When the unit is under the condition that the working condition changes, the return air superheat degree is compensated in real time through the exhaust superheat degree. The control stability of the electronic expansion valve 3 is ensured by the superheat degree of the return air, the opening degree of the electronic expansion valve 3 cannot fluctuate greatly, and the unit works stably; the exhaust superheat degree is used for automatically compensating the return air superheat degree in real time, the electronic expansion valve 3 can adjust the throttle opening degree in real time according to the working condition change, and the real-time performance and the accuracy of the control of the electronic expansion valve 3 are guaranteed.

Compared with the control by singly controlling the return air superheat degree or the exhaust superheat degree, the electronic expansion valve control system disclosed by the invention has the advantages that on one hand, the unit can respond to the working condition change in time, meanwhile, the fluctuation degree of the response to the working condition is also reduced, the fluctuation range of the opening degree of the electronic expansion valve 3 is controlled within a certain range through automatic compensation, the unit can stably work under the condition of the working condition change, the adaptability of the unit to various working conditions is improved, and the unit is good in stability and high in energy efficiency.

The first detection assembly comprises an air return temperature sensing head 5, and the air return temperature sensing head 5 is arranged at an air return opening of the compressor 1; the return air temperature sensing head 5 is used for detecting the return air temperature of the return air port of the compressor 1.

The first heat exchanger 2 is a plate heat exchanger, the second heat exchanger 4 is a fin heat exchanger, and it should be noted that the first heat exchanger 2 and the second heat exchanger 4 may also adopt heat exchangers with other structures.

The second detection assembly includes: the exhaust temperature sensing head 6, the fin temperature sensing head 7 and the temperature sensing head 8 behind the valve, the exhaust temperature sensing head 6 is arranged at the exhaust port of the compressor 1 and is suitable for acquiring the exhaust temperature; the fin temperature sensing head 7 is arranged on the second heat exchanger 4 and is suitable for acquiring the temperature of fins; the temperature sensing head 8 behind the valve is arranged between the electronic expansion valve 3 and the first heat exchanger 2 and is suitable for acquiring the temperature behind the valve.

Example two

The present embodiment provides a control method, as shown in fig. 1 to 3, including:

s1, acquiring a target return air superheat degree according to the current environment temperature and water temperature;

s2, setting an initial throttle opening according to the target return air superheat degree;

and S3, carrying out automatic compensation according to the exhaust superheat degree, and adjusting the throttle opening degree.

Specifically, in step S1, the return air superheat degree is obtained by the return air temperature sensing head 5 in the first embodiment.

In step S3, the degree of superheat of exhaust gas is adjusted by adjusting the target degree of superheat of return gas to thereby adjust the throttle opening degree at the time of automatic compensation.

When the unit works, the exhaust superheat degree responds to the change of working conditions, and when the exhaust superheat degree is higher than a set threshold value, the current return superheat degree is reduced; and when the exhaust superheat degree is lower than a set threshold value, the current return air superheat degree is increased. The specific process is as follows:

when the refrigeration cycle is executed, the exhaust superheat degree is the difference between the exhaust temperature and the fin temperature; if the exhaust superheat degree is higher than the set threshold value during refrigeration, the system can automatically compensate according to a compensation algorithm to reduce the current return superheat degree. If the exhaust superheat degree is lower than the set threshold value during refrigeration, the system can automatically compensate and improve the current return superheat degree value according to a compensation algorithm, and real-time adjustment of the temperature of the electronic expansion valve 3 under the refrigeration working condition is realized. The exhaust temperature is detected by the exhaust temperature sensing head 6 in the first embodiment, and the fin temperature is detected by the fin temperature sensing head 7 in the first embodiment.

When the heating cycle is executed, the exhaust superheat degree is the difference between the exhaust temperature and the post-valve temperature. If the exhaust superheat degree is higher than a set threshold value during heating, the system automatically compensates to reduce the current return air superheat degree according to a compensation algorithm; if the exhaust superheat degree is lower than the set threshold value during heating, the system can automatically compensate according to a compensation algorithm to improve the current return superheat degree value, so that the electronic expansion valve 3 can be adjusted in real time under the heating condition. Here, the temperature after the valve is detected by the valve body temperature sensing head in the first embodiment.

In this embodiment, the compensation algorithm adopts a proportional algorithm, that is, the return air superheat degree and the exhaust superheat degree are summed according to a certain proportion, so that the electronic expansion valve 3 has an ideal throttle opening degree under any working condition. It should be noted that, those skilled in the art may adjust the ratio of the return air superheat degree to the exhaust air superheat degree according to the actual working condition, and of course, other existing data algorithms may be adopted to implement the compensation algorithm of the present embodiment, and the variations of the compensation algorithms in different forms are within the protection scope of the present invention.