CN115682480A - Liquid separating tank for air-cooled heat pump unit - Google Patents

Abstract

The invention provides a liquid separating tank for an air-cooled heat pump unit, which comprises: the tank body is provided with an air inlet and a plurality of air outlets, and an accommodating cavity communicated with the air inlet and the plurality of air outlets is formed in the tank body; the air inlet pipe is communicated with the air inlet; one air outlet pipe is communicated with one air outlet; the orifice plate, with the inner wall fixed connection who holds the chamber to will hold the chamber and separate for first cavity and second cavity, first cavity and intake pipe intercommunication, and the cross sectional area of first cavity is crescent in the direction towards the outlet duct, second cavity and each outlet duct intercommunication run through on the orifice plate and seted up a plurality of gas pockets. By adopting the invention, the refrigerant enters the first cavity through the air inlet pipe, the cross section of the first cavity is increased, so that the flow velocity of the refrigerant is reduced, the dynamic pressure is reduced, the static pressure is increased, the initial stability is achieved, the refrigerant is further stably and uniformly distributed under the flow equalizing action of the pore plate in the process of entering the second cavity through the pore plate, and the liquid separating tank has compact integral structure and uniform liquid separation.

Description

Liquid separating tank for air-cooled heat pump unit

Technical Field

The invention relates to the technical field of air source heat pumps, in particular to a liquid separating tank for an air-cooled heat pump unit.

Background

When the air source heat pump heats, the air-cooled fin heat exchanger is an evaporator, a fin heat exchanger assembly of a common heat pump unit is composed of a plurality of same heat exchanger modules, and a liquid separation tank is needed to uniformly distribute two-phase refrigerant to each heat exchanger. The liquid separation tank in the prior art is a cylindrical barrel, and after entering from an inlet at the bottom, refrigerant spirally rises along the inner wall of the tank body in the liquid separation tank and enters the corresponding heat exchanger module through different outlets at the top. The higher the jar body, the bigger is the size, and its voltage-sharing effect is better, divides to the refrigerant of each heat exchanger module more even, but the higher the jar body is also higher with higher costs, and the unit structure restriction jar body can not be too high, so current market heat pump set has the uneven problem of liquid distribution in many occasions, influences the efficiency of unit.

Disclosure of Invention

In view of this, the invention provides a liquid separating tank for an air-cooled heat pump unit. The refrigerant gets into first cavity through the intake pipe, and the increase of first cavity cross section makes the refrigerant velocity of flow reduce, the dynamic pressure reduces, the static pressure increases, reaches preliminary stability, gets into the in-process of second cavity through the orifice plate, under the effect of flow equalizing of orifice plate, makes the refrigerant further stable and evenly distributed, discharges through each outlet duct again, and the liquid separating jar compact structure just divides the liquid even to overcome prior art's defect.

The liquid separating tank for the air-cooled heat pump unit provided by the invention comprises: the tank body is provided with an air inlet and a plurality of air outlets, and an accommodating cavity communicated with the air inlet and the plurality of air outlets is formed in the tank body; the air inlet pipe is communicated with the air inlet; one air outlet pipe is communicated with one air outlet; the pore plate is fixedly connected with the inner wall of the containing cavity and divides the containing cavity into a first cavity and a second cavity, the first cavity is communicated with the air inlet pipe, the cross section area of the first cavity is gradually increased towards the direction of the air outlet pipe, the second cavity is communicated with each air outlet pipe, and a plurality of air holes are formed in the pore plate in a penetrating mode.

Optionally, the liquid separating tank for the air-cooled heat pump unit further comprises: the baffle plate is fixedly connected with the inner wall of the second chamber and divides the second chamber into a first accommodating cavity and a second accommodating cavity, and the first accommodating cavity is arranged between the first chamber and the second accommodating cavity; each air outlet pipe penetrates through the partition board and is communicated with the first accommodating cavity, and each air outlet pipe penetrates through the second accommodating cavity and is provided with a pressure equalizing hole.

Optionally, the first chamber is circular in cross-section and gradually increases in cross-sectional area in a direction towards the outlet pipe.

Optionally, the second chamber is provided with a circular cross-section.

Optionally, the air inlet pipe is arranged coaxially with the tank.

Optionally, the orifice plate is arranged perpendicular to the inlet pipe.

Optionally, the plurality of air holes are arranged at equal intervals on the orifice plate.

Optionally, the aperture plate has an aperture ratio in the range of 0.2 to 0.25.

Optionally, the diameter d of the air hole ranges from: d is not less than 0.2 x D and not more than 0.6 x D; wherein D is the diameter of the intake pipe.

Optionally, the cross-sectional area s of the pressure equalizing hole ranges from: s is not less than 0.03 and not more than 0.033; wherein S is the area of the outer diameter cross section of the outlet pipe.

Compared with the prior art, the technical scheme provided by the invention at least has the following beneficial effects:

by adopting the liquid separating tank for the air-cooled heat pump unit, the refrigerant enters the first cavity through the air inlet pipe, the cross section of the first cavity is increased, so that the flow velocity of the refrigerant is reduced, the dynamic pressure is reduced, the static pressure is increased, the primary stability is achieved, in the process of entering the second cavity through the pore plate, the refrigerant is further stably and uniformly distributed under the flow equalizing action of the pore plate and then is discharged through each air outlet pipe, and the liquid separating tank has a compact integral structure and is uniform in liquid separation.

Drawings

FIG. 1 is a schematic structural view of a liquid separating tank for an air-cooled heat pump unit according to an embodiment of the present invention;

FIG. 2 is a sectional view of a liquid separation tank for the air-cooled heat pump unit shown in FIG. 1;

FIG. 3 is an enlarged partial view of the cross-sectional view of FIG. 2;

fig. 4 is a side view of the cross-sectional view shown in fig. 2.

Reference numerals:

1: a tank body; 2: an air inlet pipe; 3: an air outlet pipe; 31: a pressure equalizing hole; 4: an orifice plate; 41: air holes; 5: a first chamber; 6: a partition plate; 7: a first accommodating cavity; 8: a second accommodating cavity.

Detailed Description

The embodiments of the present invention will be further described with reference to the accompanying drawings. 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 of the present invention, and do not indicate or imply that the device or assembly referred to must have a specific orientation, be constructed and operated in a specific 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. Wherein the terms "first position" and "second position" are two different positions.

FIG. 1 is a schematic structural view of a liquid separating tank for an air-cooled heat pump unit according to an embodiment of the present invention; FIG. 2 is a sectional view of a liquid separation tank for the air-cooled heat pump unit shown in FIG. 1; FIG. 3 is an enlarged partial view of the cross-sectional view of FIG. 2; fig. 4 is a side view of the cross-sectional view shown in fig. 2.

As shown in fig. 1-4, the liquid separating tank for the air-cooled heat pump unit comprises a tank body 1, an air inlet pipe 2, a plurality of air outlet pipes 3 and an orifice plate 4. The tank body 1 is provided with an air inlet and a plurality of air outlets, and an accommodating cavity for communicating the air inlet with the plurality of air outlets is formed in the tank body 1; the air inlet pipe 2 is communicated with the air inlet; one of the outlet pipes 3 is communicated with one of the air outlets; the pore plate 4 is fixedly connected with the inner wall of the accommodating cavity and divides the accommodating cavity into a first cavity 5 and a second cavity, the first cavity 5 is communicated with the air inlet pipe, the cross section area of the first cavity 5 is gradually increased towards the direction of the air outlet pipe, the second cavity is communicated with each air outlet pipe, and a plurality of air holes 41 are formed in the pore plate 4 in a penetrating mode.

When the high-temperature high-pressure gas-liquid two-phase refrigerant enters the first cavity 5 of the liquid separation tank through the air inlet pipe 2, the cross section area of the first cavity 5 relative to the air inlet pipe 2 is increased, the cross section area is gradually increased towards the air outlet pipe 3, the flow speed of the refrigerant is greatly reduced, the dynamic pressure is reduced, the static pressure is increased, fluid can be preliminarily stabilized, the preliminarily stabilized refrigerant fluid penetrates through the pore plate 4 through the air holes 41 and enters the second cavity, the high-temperature high-pressure gas-liquid two-phase refrigerant fluid is balanced and adjusted under the flow equalizing effect of the air holes 41 in the process of penetrating through the pore plate 4, eddy flow is minimized, approximate ideal fluid is formed, therefore, the refrigerant in the second cavity is further stably and uniformly distributed, finally, the refrigerant enters the corresponding heat exchanger modules through the plurality of air outlet pipes 3 to complete heat exchange work, and the flow of the refrigerant discharged through each air outlet pipe 3 is the same.

By adopting the liquid separation tank for the air-cooled heat pump unit, the refrigerant enters the first cavity 5 through the air inlet pipe 2, the cross section of the first cavity 5 is increased, so that the flow velocity of the refrigerant is reduced, the dynamic pressure is reduced, the static pressure is increased, and the primary stability is achieved.

In this embodiment, as shown in fig. 1, fig. 2 and fig. 4, the tank body 1 is integrally provided with a hollow cylinder at the upper part and a hollow inverted cone at the lower part, the air inlet is arranged at the center of the bottom end of the conical part, the air inlet pipe 2 is communicated with the air inlet in the vertical direction, eight air outlets are arranged at the top end of the cylindrical part and are uniformly arranged, and one air outlet pipe 3 is communicated with one air outlet and is vertically connected with the top end face of the tank body 1. As shown in fig. 2 and 4, in this embodiment, the orifice plate 4 is a circular plate and is fixedly connected to an inner wall of a boundary between a cylindrical portion and a conical portion of the tank body 1, the first chamber 5 is disposed below the orifice plate 4, so that the first chamber 5 is integrally in an inverted cone shape, that is, the cross-sectional area of the first chamber 5 is gradually increased in a direction toward the outlet pipe 3, the first chamber 5 is communicated with the inlet pipe 2, and the cross-sectional area of the first chamber 5 is larger than that of the inlet pipe 2, so that the flow velocity of the refrigerant entering the first chamber 5 through the inlet pipe 2 is greatly reduced, the dynamic pressure is reduced, and the static pressure is increased, thereby preliminarily stabilizing the air flow. The upper part of the pore plate 4 is the second chamber, and the whole pore plate is a cylinder and communicated with the gas outlet pipes 3. A plurality of circular air holes 41 are uniformly distributed on the pore plate 4, the direction indicated by the arrow in fig. 2 is the flowing direction of the refrigerant in the liquid separation tank, after the refrigerant enters the second chamber through the pore plate 4, the refrigerant is further stably and uniformly distributed under the flow equalizing effect of the pore plate 4, and enters the corresponding heat exchanger module through each air outlet pipe 3 at the top. In this embodiment, the inner diameter of the second chamber is 250mm, 220 air holes 41 are formed in the orifice plate 4 in a penetrating manner, the diameter of each air hole 41 is 8mm, the distance between the air holes is 14mm, and the height of the liquid separation tank can be reduced to about one third of the existing height on the premise that liquid separation is uniform. According to the practical application, the specific shape and size of the tank body 1, the specific number of the air outlet pipes 3, the specific connection position of the pore plate 4 in the tank body 1, and the size and number of the air holes 41 can be adjusted.

Optionally, the liquid separating tank for the air-cooled heat pump unit further comprises a partition plate 6, the partition plate 6 is fixedly connected with the inner wall of the second chamber and divides the second chamber into a first accommodating cavity 7 and a second accommodating cavity 8, and the first accommodating cavity 7 is arranged between the first chamber 5 and the second accommodating cavity 8; each air outlet pipe 3 penetrates through the partition board 6 and is communicated with the first accommodating cavity 7, and each air outlet pipe 3 penetrates through the second accommodating cavity 8 and is provided with a pressure equalizing hole 31. Due to the arrangement, the air outlet pipes 3 are communicated with each other in the second accommodating cavity 8, the purpose of automatically equalizing the pressure in the air outlet pipes 3 is achieved, and the flow equalizing effect is further achieved.

In this embodiment, as shown in fig. 3, each of the outlet pipes 3 has one pressure equalizing hole 31 penetrating through the second accommodating cavity 8, so that the second accommodating cavity 8 is communicated with each of the outlet pipes 3, and the pressure in the second accommodating cavity 8 is an average value of the pressures in the outlet pipes 3. When the pressure in a certain air outlet pipe 3 is slightly small, the second accommodating cavity 8 automatically supplies air to the air outlet pipe 3; when the pressure in a certain outlet pipe 3 is larger, the outlet pipe 3 automatically exhausts to the second accommodating cavity 8, and the pressure in each outlet pipe 3 is automatically and uniformly distributed. The direction of the arrows in fig. 3 is the direction of flow of the refrigerant into and out of the outlet pipe 3. Because the refrigerant enters the outlet pipe 3, that is, a certain vortex disturbance exists at the bottom end of the outlet pipe 3 relative to the other positions in the extending direction of the outlet pipe 3 in fig. 3, the pressure equalizing hole 31 should be as far away from the bottom end of the outlet pipe 3 as possible, and in this embodiment, the pressure equalizing hole 31 is opened at a position of the outlet pipe 3 close to the top end face of the tank body 1, and the hole diameter is 6mm. According to the practical application, the opening position and the aperture size of the pressure equalizing hole 31 on the air outlet pipe 3 can be adjusted.

Alternatively, the first chamber 5 is provided with a circular cross-section and the cross-sectional area increases gradually in a direction towards the outlet tube 3. With the arrangement, the flow velocity of the refrigerant entering the first chamber 5 is further reduced along with the increase of the space in the process of flowing towards the orifice plate 4, and the obstruction to the flow of the refrigerant is reduced to the maximum extent by the inner wall with the circular cross section, so that the smooth flow of the refrigerant is facilitated.

In this embodiment, as shown in fig. 2 and 4, the first chamber 5 is an inverted cone as a whole, and the cross-sectional area is gradually increased in a direction toward the outlet pipe 3, that is, in an upward direction in fig. 2. The specific size of the first chamber 5 can be adjusted according to the actual application.

Optionally, the second chamber is provided with a circular cross-section. By the arrangement, when the refrigerant flows through the second chamber, the inner wall with the circular cross section can reduce the flowing obstruction of the refrigerant to the greatest extent, and the smooth flowing of the refrigerant is facilitated.

In this embodiment, as shown in fig. 2 and 4, the second chamber is generally cylindrical with an inner diameter of 250mm. The specific size of the second chamber may be adjusted according to the actual application.

Optionally, the air inlet pipe 2 is arranged coaxially with the tank 1. Due to the arrangement, the air inlet pipe 2 is positioned at the center of the tank body 1, so that the refrigerant can be uniformly dispersed to the periphery to the maximum extent after entering the tank body 1 through the air inlet pipe 2, and the uniform liquid distribution of the refrigerant when being discharged through the air outlet pipes 3 is facilitated.

In this embodiment, as shown in fig. 1, the tank 1 is integrally formed as an upper cylinder and a lower inverted cone, and the air inlet pipe 2 is communicated with the tank 1 at the center of the bottom end of the inverted cone.

Optionally, the orifice plate 4 is arranged perpendicular to the inlet pipe 2. With the arrangement, the refrigerant entering the first cavity 5 through the air inlet pipe 2 vertically passes through the pore plate 4 to the maximum extent, so that the refrigerant and the air holes 41 have the maximum passing cross section, and the refrigerant can smoothly flow in the tank body 1.

In this embodiment, as shown in fig. 2 and 4, the orifice plate 4 is perpendicular to the axial direction of the tank body 1, and the air inlet pipe 2 is coaxial with the tank body 1, so that the orifice plate 4 and the air inlet pipe 2 are perpendicular to each other.

Alternatively, a plurality of the air holes 41 are arranged at equal intervals on the orifice plate 4. With the arrangement, the refrigerant in the first chamber 5 can be dispersed more uniformly when entering the second chamber through the orifice plate 4.

In this embodiment, as shown in fig. 2 and 3, the circular air holes 41 are uniformly distributed on the entire surface of the orifice plate 4. The distance between the air holes 41 can be adjusted according to the practical application.

Optionally, the aperture plate 4 has an aperture ratio in the range of 0.2-0.25.

Through tests and simulation analysis, the influence of the relative thickness (pore plate thickness/pore diameter) of the pore plate and the flow velocity of the refrigerant on the resistance of the pore plate is small, the influence of the aperture ratio (total pore area/pore plate area) on the resistance coefficient is large, the resistance coefficient of the pore plate is increased along with the reduction of the aperture ratio, when the aperture ratio is larger than 0.2, the resistance reduction speed is very slow along with the continuous increase of the aperture ratio and tends to be stable, and if the aperture ratio is too large, the flow equalizing effect is weakened. Therefore, the aperture ratio is set to be 0.2-0.25, which not only sufficiently reduces the resistance coefficient of the orifice plate 4, but also achieves better flow equalizing effect. In the present embodiment, the aperture ratio was selected to be 0.225.

Optionally, the diameter d of the air hole 41 ranges from: d is not less than 0.2 and not more than 0.6; where D is the diameter of the inlet pipe 2.

Through experimental analysis, the diameter of the air hole 41 is selected within the range, so that a good flow equalizing effect of the refrigerant can be achieved, and within the diameter range, the smaller the aperture is, the better the flow equalizing effect is. In this embodiment, the diameter of the air hole 41 is 8mm.

Optionally, the cross-sectional area s of the pressure equalizing hole 31 ranges from: s is not less than 0.03 and not more than 0.033; wherein S is the outer diameter cross-sectional area of the outlet tube 3.

Through experimental analysis, the cross-sectional area of the pressure equalizing hole 31 is selected within the range, and a better refrigerant flow equalizing effect can be achieved. In this embodiment, the diameter of the pressure equalizing hole 31 is 6mm.

The working principle of the liquid separating tank for the air-cooled heat pump unit is further described as follows:

when the high-temperature high-pressure liquid-gas two-phase refrigerant separating device is used, the high-temperature high-pressure liquid-gas two-phase refrigerant enters the first cavity 5 of the liquid separating tank through the air inlet pipe 2, the cross section area of the first cavity 5 relative to the air inlet pipe 2 is increased, and the cross section area of the first cavity is gradually increased in the direction towards the air outlet pipe 3, so that the flow speed of the refrigerant is greatly reduced, dynamic pressure is reduced, static pressure is increased, and fluid can be initially stabilized. The initially stabilized refrigerant fluid passes through the pore plate 4 through the air holes 41 and enters the first accommodating cavity 7, and in the process of passing through the pore plate 4, under the flow equalizing effect of the air holes 41, the high-temperature and high-pressure gas-liquid two-phase refrigerant fluid is balanced and adjusted, the vortex is minimized, and an approximately ideal fluid is formed, so that the refrigerant in the first accommodating cavity 7 is further stably and uniformly distributed. The refrigerant fluid which is further stably and uniformly distributed enters the plurality of outlet pipes 3 respectively, when the refrigerant fluid flows through the second accommodating cavity 8 in the outlet pipes 3, the pressure in the outlet pipes 3 is automatically and uniformly distributed again through the pressure equalizing holes 31 formed in the outlet pipes 3, so that the refrigerant in the outlet pipes 3 is further uniformly distributed, finally, the refrigerant in the outlet pipes 3 enters the corresponding heat exchanger modules to complete heat exchange, and the flow of the refrigerant discharged through each outlet pipe 3 is the same.

By adopting the liquid separating tank for the air-cooled heat pump unit, the refrigerant enters the first cavity 5 through the air inlet pipe 2, the cross section of the first cavity 5 is increased, so that the flow rate of the refrigerant is reduced, the dynamic pressure is reduced, and the static pressure is increased, thereby achieving preliminary stability.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides an air-cooled heat pump set is with separating liquid jar which characterized in that includes:

the tank body is provided with an air inlet and a plurality of air outlets, and an accommodating cavity communicated with the air inlet and the plurality of air outlets is formed in the tank body;

the air inlet pipe is communicated with the air inlet;

one air outlet pipe is communicated with one air outlet;

the pore plate is fixedly connected with the inner wall of the containing cavity and divides the containing cavity into a first cavity and a second cavity, the first cavity is communicated with the air inlet pipe, the cross section area of the first cavity is gradually increased towards the direction of the air outlet pipe, the second cavity is communicated with each air outlet pipe, and a plurality of air holes are formed in the pore plate in a penetrating mode.

2. The liquid separating tank for the air-cooled heat pump unit according to claim 1, further comprising:

the baffle plate is fixedly connected with the inner wall of the second chamber and divides the second chamber into a first accommodating cavity and a second accommodating cavity, and the first accommodating cavity is arranged between the first chamber and the second accommodating cavity;

each air outlet pipe penetrates through the partition board and is communicated with the first accommodating cavity, and each air outlet pipe penetrates through the second accommodating cavity and is provided with a pressure equalizing hole.

3. The liquid separating tank for the air-cooled heat pump unit according to claim 1 or 2, wherein:

the cross section of the first chamber is arranged to be circular, and the area of the cross section is gradually increased in the direction towards the air outlet pipe.

4. The liquid separating tank for the air-cooled heat pump unit according to claim 1 or 2, wherein:

the cross section of the second chamber is provided in a circular shape.

5. The liquid separating tank for the air-cooled heat pump unit according to claim 1 or 2, wherein:

the air inlet pipe and the tank body are coaxially arranged.

6. The liquid separating tank for the air-cooled heat pump unit according to claim 1 or 2, wherein:

the pore plate is perpendicular to the air inlet pipe.

7. The liquid separating tank for the air-cooled heat pump unit according to claim 1 or 2, wherein:

the plurality of air holes are arranged on the pore plate at equal intervals.

8. The liquid separating tank for the air-cooled heat pump unit according to claim 1 or 2, wherein:

the aperture plate has an aperture ratio in the range of 0.2 to 0.25.

9. The liquid separating tank for the air-cooled heat pump unit according to claim 1 or 2, wherein the diameter d of the air hole is within the range of:

0.2*D≤d≤0.6*D；

wherein D is the diameter of the intake pipe.

10. The liquid separating tank for the air-cooled heat pump unit according to claim 1 or 2, wherein the range of the cross-sectional area s of the pressure equalizing hole is as follows:

0.03*S≤s≤0.033*S；

wherein S is the area of the outer diameter cross section of the outlet pipe.

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