CN213335058U

CN213335058U - Throttle device and refrigeration device

Info

Publication number: CN213335058U
Application number: CN202022372381.XU
Authority: CN
Inventors: 赵明智; 罗炽亮; 张丙; 李莹; 钟丹艳; 王双亮
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Zhuhai Gree Green Control Technology Co ltd
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2021-06-01
Anticipated expiration: 2030-10-22

Abstract

The utility model relates to a throttle technical field, in particular to throttling arrangement and refrigerating plant. The utility model discloses a throttling arrangement, include: the throttling body comprises a shell and an adjusting piece, a cavity is arranged in the shell, the adjusting piece is connected with the shell, and the opening degree of the throttling body is adjusted by adjusting the flow area of the cavity; and a light detecting element located upstream of the regulating member in a direction in which the fluid flows through the chamber, and including a light generator that emits light toward the fluid flowing through the chamber, and a light receiver that receives the light coupled with the fluid and reaches the light receiver. Based on the control method, the opening degree of the throttling device can be adjusted based on the signal receiving rate of the light detection element, and the types of opening degree adjusting and controlling modes of the throttling device are effectively enriched.

Description

Throttle device and refrigeration device

Technical Field

The utility model relates to a throttle technical field, in particular to throttling arrangement and refrigerating plant.

Background

In an air conditioning system, a throttle device such as an electronic expansion valve is an important component, and the opening degree of the throttle device affects the flow rate of a refrigerant, and is an important factor for determining whether the air conditioning system can operate reliably, stably and efficiently.

In the related art, the opening degree of the throttling device is controlled based on the evaporation pressure, and a temperature sensor and a pressure sensor are required to be arranged at an evaporator, collect a superheat degree signal and perform feedback to adjust the opening degree of the throttling device.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a throttling arrangement and refrigerating plant.

The utility model provides a throttling arrangement, include:

the throttling body comprises a shell and an adjusting piece, a cavity is arranged in the shell, the adjusting piece is connected with the shell, and the opening degree of the throttling body is adjusted by adjusting the flow area of the cavity; and

and a light detection element located upstream of the regulating member in a direction in which the fluid flows through the chamber, and including a light generator that emits light toward the fluid flowing through the chamber, and a light receiver that receives the light coupled with the fluid and reaches the light receiver.

In some embodiments, the light generator is disposed on the same side of the chamber transverse central axis as the light receiver, or the light generator is disposed on opposite sides of the chamber transverse central axis as the light receiver.

In some embodiments, a through hole is provided on the housing, and the light generator is connected to the housing through the through hole.

In some embodiments, the first end of the light detecting element is located outside or inside the chamber, wherein when the light generator and the light receiver are disposed on the same side of the chamber transverse central axis, the first end of the light detecting element is the end of the light receiver facing the inside of the chamber; alternatively, when the light generator is disposed on both sides of the lateral central axis of the chamber opposite to the light receiver, the first end of the light detecting element is an end of the light generator facing the inside of the chamber.

In some embodiments, the first end of the light detecting element is located outside the chamber, and the flow restriction device further comprises a light transmissive element closing an end of the through hole facing the inside of the chamber.

In some embodiments, the end of the optically transparent member facing the interior of the chamber is located in the chamber, or the end of the optically transparent member facing the interior of the chamber is located outside the chamber.

In some embodiments, the housing includes a first shell section, a second shell section, and a third shell section connected in series along a direction of fluid flow through the chamber, the chamber includes a first cavity located within the first shell section, a second cavity located within the second shell section, and a third cavity located within the third shell section, a cross-sectional area of the second cavity is smaller than cross-sectional areas of the first cavity and the third cavity, and the adjustment member and the light detection element are disposed in the second shell section.

In some embodiments, the throttle body is an electronic expansion valve, and the housing and the regulating member are a valve body and a valve core of the electronic expansion valve, respectively.

In some embodiments, the light detection element is a photosensor or a fiber optic sensor.

The utility model discloses still provide a refrigerating plant in addition, a serial communication port, include the utility model discloses the throttling arrangement of each embodiment.

Through set up the light detection element who is located the regulating part upper reaches on throttling arrangement's casing, make the utility model discloses need not to confine throttle arrangement aperture regulation and control mode based on evaporating pressure again, but can adjust throttling arrangement's aperture based on light detection element's signal reception rate, effectively richen the kind of throttle arrangement aperture regulation and control mode.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.

Drawings

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

Fig. 1 is a schematic view of a throttle device according to some embodiments of the present invention.

Fig. 2 is a schematic view of a combination structure of the light detecting element and the light transmitting element in fig. 1.

Fig. 3 is a schematic view of a throttle device according to another embodiment of the present invention.

Fig. 4 is a schematic view of a combined structure of the light detecting element and the light transmitting element in fig. 3.

Fig. 5 is a schematic view of a throttle device according to still other embodiments of the present invention.

Fig. 6 is a schematic flow chart of a method for regulating a flow restriction device according to some embodiments of the present invention.

Fig. 7 is a flowchart illustrating step S200 in some embodiments.

In the figure:

10. a throttling device;

1. a throttle body; 11. a housing; 111. a first shell segment; 112. a second shell segment; 113. a third shell segment; 12. an adjustment member; 13. a chamber; 131. a first chamber; 132. a second chamber; 133. a third chamber; 14. a through hole;

2. a light detection element; 21. a light generator; 22. an optical receiver;

3. a light transmissive element.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by the ordinary skilled person in the art without developing the creative work belong to the protection scope of the present invention.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

In the description of the present invention, it should be understood that the terms "first", "second", etc. are used to define the components, and are only used for the convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, should not be interpreted as limiting the scope of the present invention.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

The utility model discloses based on to throttling arrangement's institutional advancement, realize the change to throttling arrangement regulation and control method for can provide an aperture regulation and control mode based on the signal reception rate of light detection element, this is one kind and the different regulation and control mode of aperture regulation and control mode based on evaporating pressure among the correlation technique, is a new regulation and control mode, thereby can effectively enrich throttling arrangement's aperture regulation and control mode.

Fig. 1 to 5 show an exemplary structure of the throttle device of the present invention. Fig. 6-7 exemplarily show a regulating method of the throttling device of the present invention.

Referring to fig. 1-5, in some embodiments of the present invention, a throttle device 10 includes a throttle body 1 and a light detecting element 2.

The throttle body 1 includes a housing 11 and an adjuster 12. A chamber 13 is provided in the housing 11. The adjuster 12 is connected to the housing 11, and adjusts the opening degree of the throttle body 1 by adjusting the flow area of the chamber 13. For example, in some embodiments, the throttle body 11 is an electronic expansion valve or a thermal expansion valve, and the housing 11 and the adjusting member 12 are a valve body and a valve cavity. However, the structure of the throttle body 1 is not limited to this, and for example, the throttle body 1 may be another throttle element than a throttle valve such as an orifice plate.

The light detecting element 2 is located upstream of the regulating member 12 in the direction in which the fluid flows through the chamber 13 (i.e., the direction of the arrow in fig. 1, 3, and 5), and includes a light generator 21 and a light receiver 22. The light generator 21 emits light towards the fluid flowing through the chamber 13. The light receiver 22 is used for receiving the light coupled with the fluid and arriving at the light receiver 22. The light detection element 2 may be a photoelectric sensor or an optical fiber sensor. The light coupled with the fluid and reaching the light receiver 22 may be light reflected by the fluid or light refracted by the fluid. I.e. coupling to the fluid, may include both reflection by the fluid and refraction by the fluid. For example, referring to fig. 1-4, in some embodiments, the light generator 21 is disposed on the same side of the lateral central axis of the chamber 13 as the light receiver 22, and the light receiver 22 receives light reflected by the fluid after being emitted by the light generator 21. For another example, referring to FIG. 5, in other embodiments, the light generator 21 is disposed opposite the light receiver 22 on both sides of the transverse central axis of the chamber 13, and the light receiver 22 receives light rays refracted by the fluid after being emitted by the light generator 21. It will be understood that the transverse central axis refers to the central axis of the chamber 13 in the direction of fluid flow through the chamber.

Based on the above arrangement, when a fluid such as a refrigerant flows through the throttle body 1, the supercooling degree of the fluid can be detected by using the light detection element 2, and the detection result of the light detection element 2 is used as the regulation and control basis of the opening degree of the throttle body.

The detection of the supercooling degree by the photodetection element 2 can be realized by detecting the density of the fluid upstream of the adjuster 12. Because, the density of the fluid can reflect the magnitude of the supercooling degree. When the supercooling degrees are different, the density of the fluid is changed correspondingly. The greater the supercooling degree, the greater the fluid density. The supercooling degree of the same fluid in different states is related to the fact that the gas state is less than the small-density liquid state and less than the large-density liquid state, namely, the supercooling degree is gradually increased from the gas state to the small-density liquid state and then to the large-density liquid state. In the pure gas state (or called as the gas-full state), the density is the minimum, the supercooling degree is the minimum, when the liquid state exists, compared with the pure gas state, the density is increased, the supercooling degree is increased, when the liquid state exists, the density is increased and the supercooling degree is increased along with the increase of the liquid fluid, for example, the density of the pure liquid state (or called as the liquid-full state) is greater than the density of the gas-liquid two-phase state, correspondingly, the supercooling degree of the pure liquid state is also greater than the supercooling degree of the gas-liquid two-phase state, and for example, when the gas-liquid two-phase state is more, the density is greater, and the supercooling degree is greater. As can be seen, the light detecting element 2 can detect the supercooling degree by detecting the density of the fluid.

The detection result of the fluid density by the photodetection element 2 can be characterized by the signal receiving rate a of the photodetection element 2. The signal receiving rate a is the product of the ratio of the number m of signals received by the optical receiver 22 to the number n of signals emitted by the optical generator 21 per at 0 times, and 100%, that is,

the larger the signal receiving rate a, the more signals the optical receiver 22 receives, the less the gaseous fluid, the more the liquid fluid, and the denseThe larger the degree, the larger the supercooling degree. This is mainly because, when the density of the fluid is higher, that is, the liquid fluid is higher, the light irradiated on the fluid by the light generator 21 is reflected or refracted to the light receiver 22 more, and the light is received by the light receiver 22, that is, the signal receiving rate a is higher.

For example, when the light receiver 22 and the light generator 21 are located on the same side of the lateral central axis of the chamber 13, and the light received by the light receiver 22 is the light reflected by the fluid, if the fluid is in a pure liquid state, the light generated by the light generator 22 on the liquid surface can be almost reflected back to the light receiver 22 and received by the light receiver 22, in other words, every time the light generator 22 generates a signal, the light receiver 22 can almost receive a signal, and at this time, the number m of the signals received by the light receiver 22 is equal to or approximately equal to the number n of the signals generated by the light generator 21 every t0, and the ratio of the number m of the signals received by the light receiver 22 to the number n of the signals generated by the light generator 21 is 1 or approximately 1, so the signal receiving rate a is; if the fluid is in a gas-liquid two-phase state, bubbles are entrained in the liquid fluid, and the bubbles change the light reflection angle, so that when light irradiates on the bubbles, the light receiver 22 cannot receive light any more, and the signal received by the light receiver 22 is intermittent, that is, the number m of signals received by the light receiver 22 is smaller than the number n of signals sent by the light generator 21, and the signal receiving rate a is smaller than 100%, and in this case, the more bubbles, the less signals received by the light receiver 22 in the Δ t0 time, the smaller the signal receiving rate a.

For another example, when the light generator 21 and the light receiver 22 are disposed on two sides of the lateral central axis of the chamber 13 opposite to each other, and the light received by the light receiver 22 is the light refracted by the fluid, if the fluid is in a pure liquid state, the light irradiated onto the liquid surface by the light generator 22 can almost all be irradiated onto the light receiver 22 through the liquid surface and received by the light receiver 22, in other words, every time the light generator 22 sends a signal, the light receiver 22 can almost receive a signal, at this time, the number m of the signals received by the light receiver 22 is equal to or approximately equal to the number n of the signals sent by the light generator 21 every Δ t0 time, the ratio of the two is equal to or approximately equal to 1, and therefore, the signal receiving rate a is equal to or approximately equal to 100%; if the fluid is in a gas-liquid two-phase state, bubbles are entrained in the liquid fluid, and when light irradiates an interface of the gas-liquid two-phase, the refraction angle changes and cannot reach the light receiver 22 any more, so that the light receiver 22 cannot receive light any more, and the signal received by the light receiver 22 is intermittent, that is, the number m of signals received by the light receiver 22 is smaller than the number n of signals sent by the light generator 21, and the signal receiving rate a is smaller than 100%, and in this case, the more bubbles, the less signals are received by the light receiver 22 in the Δ t0 time, and the smaller the signal receiving rate a is.

Therefore, the optical detection element 2 is additionally arranged on the throttling body 1, so that the degree of supercooling can be represented by the signal receiving rate a of the optical detection element 2, the opening degree of the throttling body 1 is adjusted based on the signal receiving rate a, a new opening degree adjusting and controlling mode based on the signal receiving rate a is realized, the supercooling degree of a unit is favorably fully utilized, the cold quantity of the unit is effectively improved, and the performance of the unit is changed.

Referring to fig. 6 to 7, when the opening degree is controlled based on the signal receiving rate a, the opening degree may be controlled according to the following steps:

s100, determining the signal receiving rate a of the light detection element 2;

and S200, adjusting the flow area of the chamber 13 by using the adjusting piece 12 according to the signal receiving rate a so as to adjust the opening degree of the throttling body 1.

In some embodiments, step S100 comprises:

recording the number m of signals received by the light receiver 22 and the number n of signals sent by the light generator 21 per Δ t0, and calculating the signal values according to the formula

The signal reception rate a is calculated.

In some embodiments, step S200 comprises:

s200', according to the size of the signal receiving rate a, the opening degree of the throttle body 1 is adjusted, so that the signal receiving rate a is smaller than or equal to a first threshold value q1 and larger than or equal to a second threshold value q 2.

Wherein the first threshold q1 is a percentage less than 100% and greater than 0; the second threshold q2 is a percentage greater than 0 and less than or equal to the first threshold q 1. The first threshold q1 and the second threshold q2 may be set according to actual requirements.

The step S200' forms feedback adjustment based on the signal receiving rate a, which can be controlled within the range of the first threshold q1 and the second threshold q2, and since the signal receiving rate a is a representation of the supercooling degree, this means that the supercooling degree can be controlled within a certain range, which is beneficial to implementing a finer flow control process.

Specifically, in some embodiments, step S200' further comprises:

s201, when the signal receiving rate a is larger than a first threshold value q1, the opening degree of the throttle body 1 is increased until the signal receiving rate a is smaller than or equal to a first threshold value q 1;

s202, when the signal receiving rate a is smaller than a second threshold value q2, the opening degree of the throttle body 1 is reduced until the signal receiving rate a is larger than or equal to the second threshold value q 2;

s203, when the signal reception rate a is less than or equal to the first threshold value q1 and greater than or equal to the second threshold value q2, the current opening degree of the throttle device 10 is maintained.

When the opening degree of the throttle body 1 is adjusted to be large in step S201, the opening degree of the throttle body 1 may be adjusted to be large by Δ O1% every Δ t1 seconds, so that the opening degree of the throttle body 1 is increased at a constant speed, the influence of the opening degree increasing process on the system working stability is reduced, and system impact caused by sudden increase of the opening degree is avoided.

In step S202, the opening degree of the throttle body 1 is reduced until the signal reception rate a becomes equal to or greater than the second threshold value q2, and the opening degree is stopped from being reduced and maintained.

In some embodiments, when the opening degree of the throttle body 1 is reduced in step S202, the opening degree of the throttle body 1 is reduced by Δ O2% every Δ t2 seconds, so that the opening degree of the throttle body 1 is reduced at a constant speed, the influence of the opening degree reduction process on the working stability of the system is reduced, and system impact caused by sudden reduction of the opening degree is avoided.

Where Δ t1 may be equal to Δ t 2.Δ O1% may be equal to Δ O2%. When Δ t1 is equal to Δ t2 and Δ O1% is equal to Δ O2%, the control parameters can be reduced, simplifying the control process.

Therefore, the optical detection element 2 is additionally arranged on the upper stream of the adjusting piece 12, the dynamic detection and recording are carried out on the state of the fluid flowing through the throttling body 1, the signal receiving rate a is calculated based on the detection and recording results, the supercooling degree condition is analyzed, the opening degree of the throttling body 1 is finely adjusted in an effective range, the supercooling degree of a unit can be accurately controlled, and the refrigerating capacity and the refrigerating performance of the unit are effectively improved under the condition of fully utilizing the supercooling degree. Tests show that the effective cold quantity of the unit can be improved by about 10 percent and the coefficient of refrigerating performance can be improved by about 1 percent after the regulation and control method of the utility model is adopted.

The way in which the light detecting element 2 is arranged is further described below with reference to fig. 1-5.

Referring to fig. 1-5, in some embodiments, a through hole 14 is provided in the housing 11, and the light generator 21 is connected to the housing 11 through the through hole 14. At this time, the light generator 21 is disposed on the housing 11. The through hole 14 facilitates the installation of the light generator 21 on the housing 11, and avoids the light emitted by the light generator 21, so that the light emitted by the light generator 21 can be smoothly irradiated into the chamber 13.

Also, referring to fig. 1-5, in some embodiments, the first end of the light detecting element 2 is located outside or inside the chamber 13. The first end of the light detecting element 2 refers to an end of the light receiver 22 facing the inside of the chamber 13 when the light generator 21 and the light receiver 22 are disposed on the same side of the lateral central axis of the chamber 13, and refers to an end of the light generator 21 facing the inside of the chamber 13 when the light generator 21 and the light receiver 22 are disposed opposite to each other on both sides of the lateral central axis of the chamber 13. That is, as shown in fig. 1-4, when the light generator 21 and the light receiver 22 are disposed on the same side of the lateral central axis of the chamber 13, the first end of the light detecting element 2 is the end of the light receiver 22 facing the inside of the chamber 13; alternatively, as shown in fig. 5, when the light generator 21 is disposed opposite to the light receiver 22 on both sides of the lateral central axis of the chamber 13, the first end of the light detecting element 2 is an end of the light generator 21 facing the inside of the chamber 13.

When the first end of the light detecting element 2 is located inside the chamber 13, referring to fig. 5, the first end of the light detecting element 2 is inserted into the chamber 13 through the through hole 14, at this time, the light emitted by the light generator 2 is reflected or refracted inside the liquid, and the detection position of the light detecting element 2 is located below the liquid level and close to the transverse central axis of the liquid, which is beneficial to obtaining a more accurate detection result.

When the first end of the light detecting element 2 is located outside the chamber 13, referring to fig. 1-4, in some embodiments the restriction device 10 further comprises a light transmissive element 3, the light transmissive element 3 closing an end of the through hole 14 facing the inside of the chamber 13.

Since the light transmitting element 3 closes the end of the through hole 14 facing the chamber 13, the fluid in the chamber 13 can be prevented from entering the through hole 14, which can prevent the fluid from fluctuating due to the provision of the through hole 14, thereby facilitating the improvement of the detection accuracy.

At the same time, since the light transmissive element 3 is capable of transmitting light, the light transmissive element 3 does not affect the coupling of the light generated by the light generator 21 with the fluid. The light-transmitting member 3 may be a transparent member.

Therefore, the light-transmitting element 3 can improve the detection accuracy of the light-detecting element 2 without affecting the detection function of the light-detecting element 2.

Referring to fig. 1-2, in some embodiments, the end of the optically transparent member 3 facing the inside of the chamber 13 is located outside the chamber 13. At this time, the end of the light-transmitting element 3 facing the inside of the chamber 13 is not inserted into the chamber 13 through the through hole 14, the light generated by the light generator 2 can be reflected or refracted on the outer surface of the fluid, and the detection position of the light-detecting element 2 is located on the outer surface of the fluid.

Referring to fig. 3-4, in other embodiments, the end of the optically transparent member 3 facing the interior of the chamber 13 is located in the chamber 13. At this time, one end of the light transmitting element 3 facing the inside of the chamber 13 is inserted into the chamber 13 through the through hole 14, the light generated by the light generator 2 is reflected or refracted inside the fluid, and the detection position of the light detecting element 2 is located below the outer surface of the fluid and close to the transverse central axis of the fluid, which is beneficial to obtaining a more accurate detection result.

The embodiments shown in fig. 1-5 are further described below.

The embodiment shown in fig. 1-2 will first be described.

As shown in fig. 1 to 2, in this embodiment, the throttle device 10 is provided in a refrigeration apparatus such as an air conditioner, and includes a throttle body 1, a light detection element 2, and a light transmission element 3.

The throttle body 1 includes a housing 11 and an adjuster 12. A chamber 13 is provided in the housing 11. The adjusting member 12 is liftably inserted into the chamber 13 to change an effective flow area of the chamber 13, thereby changing an opening degree of the throttle body 1. Specifically, the housing 11 includes a first housing section 111, a second housing section 112, and a third housing section 113 that are connected in series along a direction in which a fluid flows through the chamber 13 (i.e., in a right-to-left direction indicated by an arrow in fig. 1). Chamber 13 includes a first cavity 131 located within first shell section 111, a second cavity 132 located within second shell section 112, and a third cavity 133 located within third shell section 113. The first chamber 131, the second chamber 132, and the third chamber 133 are sequentially communicated in a direction in which the fluid flows through the chamber 13. The cross-sectional area of the second chamber 132 is smaller than the cross-sectional areas of the first chamber 131 and the third chamber 133 such that a necked-down segment is formed at the second chamber 132. The adjuster 12 is disposed on the second shell segment 112 and inserted into the second cavity 132.

The light detecting element 2 is also arranged on the second shell section 112 and is positioned at the right side of the regulating member 12, so that the light detecting element 2 is positioned at the upstream of the regulating member 12 along the direction of the fluid flowing through the chamber 13, and the state of the fluid can be detected when the fluid is not throttled by the throttling body 1, so as to obtain the supercooling degree information. Specifically, in this embodiment, the second case section 112 is provided with a through hole 14, and the light detecting element 2 is inserted into the through hole 14. At this time, the light generator 21 and the light detecting element 22 of the light detecting element 2 are located on the same side of the lateral central axis of the chamber 13, and the bottom end (i.e., the end facing the inside of the chamber 13) of the light generator 22 becomes the first end of the light detecting element 2, is located in the through hole 14, and is located outside the chamber 13.

The light-transmitting element 3 fills the portion of the through hole 14 located below the first end of the light-detecting element 2, at this time, the light-transmitting element 3 closes the end of the through hole 14 facing the inside of the cavity 13 (i.e., the bottom end of the through hole 14 in fig. 1), and the light-transmitting element 3 is smaller in thickness, and is located entirely in the through hole 14, with the end facing the inside of the through hole 14 (i.e., the bottom end of the light-transmitting element 3 in fig. 1) not inserted into the cavity 13.

With the arrangement of this embodiment, when the fluid flows through the chamber 13, the light generated by the light generator 21 can pass through the light-transmitting element 3 and irradiate on the outer surface of the fluid, wherein when the light irradiates on the surface of the fluid, the light is reflected, and the reflected light is received by the light receiver 22, and the light detecting element 2 generates a 1 signal; when the light is irradiated on the bubble, the light receiver 22 cannot receive the reflected light, and the light detecting element 2 sends a 0 signal. Thus, the reflected signal is counted and calculated to obtain the signal receiving rate a, and then the opening degree of the throttle body 1 can be adjusted by adopting the regulation and control method described above.

The embodiments shown in fig. 2-3 are described next. For simplicity of description, only the differences between this embodiment and the embodiment shown in fig. 1-2 will be described herein with emphasis.

As shown in fig. 2-3, this embodiment differs from the embodiment shown in fig. 1-2 mainly in that the light-transmitting element 3 is no longer entirely located in the through-hole 14, but the bottom end extends into the cavity 13. Specifically, in this embodiment, the light-transmitting member 3 is no longer a thin sheet having a thickness smaller than the depth of the through hole 14, but is changed into a block-like structure having a thickness larger than the depth of the through hole 14, and the top end of the light-transmitting member 3 is substantially flush with the top end of the through hole 14, and the bottom end of the light-transmitting member 3 is located below the bottom end of the through hole 14, within the chamber 13. Thus, light generated by the light generator 2 is reflected inside the liquid, and the detection position of the light detection element 2 is located below the outer surface of the liquid, close to the transverse central axis of the liquid.

The embodiment shown in fig. 5 is described next. Again, only the differences between this embodiment and the embodiment shown in fig. 1-2 will be emphasized to simplify the description.

As shown in fig. 5, this embodiment differs from the embodiment shown in fig. 1-2 mainly in that in this embodiment the light generator 21 and the light receiver 22 are no longer located on the same side of the transverse central axis of the chamber 13, but on opposite sides of the transverse central axis of the chamber 13. Specifically, as shown in fig. 5, in this embodiment, the light generator 21 is inserted into the chamber 13 via the through hole 14, the bottom end of the light generator 21 is located below the bottom end of the through hole 14, which becomes the first end of the light detecting element 2, and at the same time, the light receiver 22 is disposed on the inner wall of the housing 11 and located directly below the light generator 21. Thus, the light received by the light receiver 22 is refracted light, and the detection position of the light detecting element 2 is close to the fluid lateral central axis.

The above description is only exemplary embodiments of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A throttle device (10), characterized by comprising:

the throttle body (1) comprises a shell (11) and an adjusting piece (12), a cavity (13) is arranged in the shell (11), the adjusting piece (12) is connected with the shell (11), and the opening degree of the throttle body (1) is adjusted by adjusting the flow area of the cavity (13); and

the light detection element (2) is located upstream of the adjusting piece (12) along the direction of fluid flowing through the cavity (13) and comprises a light generator (21) and a light receiver (22), wherein the light generator (21) emits light to the fluid flowing through the cavity (13), and the light receiver (22) is used for receiving the light which reaches the light receiver (22) after being coupled with the fluid.

2. The throttling device (10) according to claim 1, wherein the light generator (21) is arranged on the same side of the lateral central axis of the chamber (13) as the light receiver (22), or the light generator (21) is arranged on both sides of the lateral central axis of the chamber (13) opposite to the light receiver (22).

3. The throttle device (10) according to claim 1 or 2, characterized in that the housing (11) is provided with a through hole (14), and the light generator (21) is connected with the housing (11) through the through hole (14).

4. A flow restriction device (10) according to claim 3, wherein the first end of the light detecting element (2) is located outside or inside the chamber (13), wherein the first end of the light detecting element (2) is the end of the light detecting element (2) facing the inside of the chamber (13) when the light generator (21) and the light receiver (22) are arranged on the same side of the lateral centre axis of the chamber (13); alternatively, when the light generator (21) is arranged opposite to the light receiver (22) on both sides of the lateral central axis of the chamber (13), the first end of the light detecting element (2) is the end of the light generator (21) facing the inside of the chamber (13).

5. The flow restriction device (10) according to claim 4, wherein the first end of the light detecting element (2) is located outside the chamber (13), and the flow restriction device (10) further comprises a light transmitting element (3), the light transmitting element (3) closing an end of the through hole (14) facing the inside of the chamber (13).

6. The flow restriction device (10) according to claim 5, characterized in that the end of the light transmitting element (3) facing the interior of the chamber (13) is located in the chamber (13) or the end of the light transmitting element (3) facing the interior of the chamber (13) is located outside the chamber (13).

7. The throttle device (10) according to claim 1, wherein the housing (11) comprises a first shell section (111), a second shell section (112) and a third shell section (113) which are connected in sequence along a direction of fluid flow through the chamber (13), the chamber (13) comprises a first cavity (131) located in the first shell section (111), a second cavity (132) located in the second shell section (112) and a third cavity (133) located in the third shell section (113), the cross-sectional area of the second cavity (132) is smaller than the cross-sectional areas of the first cavity (131) and the third cavity (133), and the adjusting member (12) and the light detecting element (2) are both arranged in the second shell section (112).

8. Throttling device (10) according to claim 1, wherein said throttling body (1) is an electronic expansion valve, and said housing (11) and said regulating member (12) are respectively a valve body and a valve spool of said electronic expansion valve.

9. Throttling device (10) according to claim 1, wherein said light detecting element (2) is a photosensor or a fiber optic sensor.

10. A refrigeration device, characterized by comprising a throttle device (10) according to any one of claims 1-9.