CN211501779U - Refrigeration cycle system and throttle valve thereof - Google Patents

Abstract

The utility model relates to a refrigeration cycle system and choke valve thereof. The throttle valve comprises a valve pipe, a valve seat, a seal head and a throttle component. The valve pipe is of a hollow structure. The valve seat is received and fixed in the valve pipe. The valve seat is of a hollow structure, and a valve port is formed in one end of the valve seat. The seal head is accommodated and fixed in the valve pipe. The head is the hollow structure of both ends open-ended, and the one end of head and the one end butt that the valve port was kept away from to the disk seat to form the throttle passageway with the disk seat intercommunication. The throttling assembly is accommodated in the throttling channel. The utility model provides a refrigeration cycle system and choke valve length is less, is convenient for realize the miniaturization.

Description

Refrigeration cycle system and throttle valve thereof

Technical Field

The utility model relates to a throttle technical field especially relates to a refrigeration cycle system and choke valve thereof.

Background

In the refrigeration cycle system, a throttle valve is generally provided to regulate the flow rate of the coolant. However, the throttle valve in the prior art has a long length, which results in a large volume occupied by the throttle valve during use, and is not favorable for realizing miniaturization.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a throttle valve with a smaller length in order to solve the problem of the longer length of the conventional throttle valve.

The valve pipe is of a hollow structure;

the valve seat is accommodated and fixed in the valve pipe and is of a hollow structure, and one end of the valve seat is provided with a valve port;

the end socket is accommodated and fixed in the valve pipe and is of a hollow structure with two open ends, and one end of the end socket is abutted against one end of the valve seat far away from the valve port so as to be communicated with the valve seat to form a throttling channel; and

the throttling assembly is accommodated in the throttling channel.

In one embodiment, the inner wall of the valve tube is provided with a first limiting part, and one end, far away from the valve seat, of the seal head is abutted against the first limiting part.

In one embodiment, the first limiting portion is an annular protrusion, one end, away from the valve seat, of the seal head penetrates through the annular protrusion, and the outer diameter of the end, away from the valve seat, of the seal head is gradually reduced along the direction from the valve seat to the seal head.

In one embodiment, the inner wall of the valve tube is provided with a second limiting portion, the outer wall of the valve seat forms a matching portion, and the matching portion is matched and fixed with the second limiting portion.

In one embodiment, the first position-limiting portion is an annular protrusion, and the matching portion is a slot.

In one embodiment, the throttling assembly includes a valve needle and an elastic member, the valve needle slidably penetrates through the valve port, two opposite ends of the elastic member respectively abut against the inner walls of the valve needle and the sealing head, and the elastic member provides an elastic restoring force directed to the valve port for the valve needle.

In one embodiment, the elastic element is a compression spring, the elastic element is sleeved at one end of the valve needle far away from the valve port, and the elastic element is partially accommodated in the sealing head.

In one embodiment, the valve seat includes a valve body and a seat body provided with a valve port, one end of the valve body abuts against the seal head, and the seat body is clamped in the valve body and located at one end of the valve body away from the seal head.

In one embodiment, the filter element extends along the axial direction of the valve tube, and is received and fixed in the valve tube and aligned with the valve port.

A refrigeration cycle system comprises the throttle valve. A refrigeration cycle system comprises the throttle valve.

Above-mentioned refrigeration cycle system and choke valve thereof, the one end of head and the one end butt that the valve port was kept away from to the disk seat, relative head and disk seat interval set up, and the length that head and disk seat occupy in the valve pipe is littleer. Furthermore, the throttling assembly is accommodated in the throttling channel, so that the length of the throttling assembly is overlapped with the length of the seal head and the valve seat, and the length of the seal head, the valve seat and the throttling assembly is only simplified into the length of the seal head and the valve seat, so that the occupied length of the seal head, the valve seat and the throttling assembly in the valve pipe can be further reduced, the length of the throttling valve is smaller, and the throttling valve is convenient to miniaturize.

Drawings

Fig. 1 is a cross-sectional view of a throttle valve according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a seat body of the throttle valve shown in FIG. 1;

fig. 3 is a schematic view of the structure of the valve needle in the throttle valve shown in fig. 1.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, the present invention provides a refrigeration cycle system. The utility model provides a refrigeration cycle system includes choke valve 100, condenser and evaporimeter.

The throttle valve 100 is provided with an inlet 111 and an outlet 112. The condenser communicates with the inlet 111 and the evaporator communicates with the outlet 112. The throttle valve 100 controls the flow rate of the refrigerant supplied from the condenser and outputs the refrigerant to the evaporator.

Throttle valve 100 includes valve tube 110, valve seat 120, head 130, and a throttle assembly (not shown).

The valve tube 110 has a hollow structure. The valve tube 110 may be installed and protected and used to house the valve seat 120, the head 130, and the throttling assembly. The opposite ends of the valve tube 110 are respectively provided with an inlet 111 and an outlet 112.

The inner wall of the valve tube 110 is provided with a first position-limiting portion 113, a second position-limiting portion 114 and a third position-limiting portion 115. The first position-limiting portion 113, the second position-limiting portion 114, and the third position-limiting portion 115 are sequentially disposed at intervals in the axial direction of the valve tube 110. The first stopper 113 is adjacent to the outlet 112. The third stopper 115 is adjacent to the inlet 111. Specifically, the first position-limiting portion 113, the second position-limiting portion 114 and the third position-limiting portion 115 may be a convex structure or a concave structure.

In the present embodiment, the first position-limiting portion 113, the second position-limiting portion 114 and the third position-limiting portion 115 are all annular protrusions, and are recessed from the outer wall of the valve tube 110. Compared with the operation in the valve tube 110, the valve tube 110 has a wider operation space outside, so that the first limiting portion 113, the second limiting portion 114 and the third limiting portion 115 are formed more simply.

The valve seat 120 is received and fixed in the valve tube 110, and extends in the axial direction of the valve tube 110. Specifically, the valve seat 120 may be secured within the valve tube 110 by fasteners, snaps, adhesives, or other means. In this embodiment, the outer wall of the valve seat 120 is formed with a matching portion 123, and the matching portion 123 is matched with the second limiting portion 114 to fix the valve seat 120.

Therefore, the valve seat 120 and the valve tube 110 can be fixed without using a fastener, so that the production cost of the throttle valve 100 can be reduced.

Further, in the present embodiment, the second position-limiting portion 114 is an annular protrusion, the matching portion 123 is a slot, and the annular protrusion is clamped in the slot.

Specifically, the outer wall of the valve seat 120 is recessed to form an annular groove 123, and the annular groove 123 is matched with the annular protrusion, so that the valve seat 120 can be clamped and fixed from the circumferential direction of the valve seat 120, the valve seat 120 is prevented from sliding along the axial direction of the valve tube 110, and the reliability of installation of the valve seat 120 is improved.

The valve seat 120 is a hollow structure, one end of the valve seat 120 is opened with a valve port 121, and the other end of the valve seat 120 is opened with a communication port 122 communicated with the valve port 121. The valve port 121 is positionally aligned with the inlet 111. The communication port 122 is positionally aligned with the outlet 112. The aperture of the valve port 121 is smaller than the aperture of the communication port 122. The axes of the valve port 121 and the communication port 122 coincide with the axis of the valve tube 110.

Referring also to FIG. 2, the valve port 121 includes a tapered section 1213, a straight section 1211 and a flared section 1212. The tapered section 1213, the straight section 1211 and the flared section 1212 of the valve port 121 are sequentially disposed along the direction from the inlet 111 to the outlet 112 and communicate with each other. In the direction from the inlet 111 to the outlet 112, the inner diameter of the flared section 1212 is gradually increased and larger than the inner diameters of the straight-mouth section 1211 and the tapered section 1213, the inner diameter of the straight-mouth section 1211 remains unchanged and is larger than the inner diameter of the tapered section 1213, and the inner diameter of the tapered section 1213 is gradually increased. In this embodiment, the valve seat 120 further includes a valve body 125 and a seat body 124. The valve body 125 and the seat 124 are hollow. The seat 124 is held in the valve body 125 and is located at one end of the valve body 125. The seat body 124 is provided with a valve port 121 penetrating through the seat body 124. An end of the valve body 125 remote from the valve port 121 forms a communication port 122.

If the valve body 125 and the seat body 124 are integrally formed, when the valve port 121 is formed on the valve seat 120, a drilling tool with a shape matching the valve port 121 is generally inserted into the valve body 125 from the communication port 122, and a flared section 1212, a straight section 1211, and a tapered section 1213 are sequentially drilled on the seat body 124. Generally, the valve body 125 has a long length, and if the drilling tool extends into the communication port 122 for a long distance to drill, the operation is relatively troublesome, and the drilling tool may not be aligned with the position of opening the valve port 121, so that the valve port 121 may be deviated, and the flow control accuracy may be poor.

In the present embodiment, by detachably connecting the seat body 124 and the valve body 125, the seat body 124 can be clamped in the valve body 125 by opening the valve port 121 on the seat body 124 in advance, and the valve port 121 and the communication port 122 are aligned to each other, so as to fix the valve seat 120 and the seat body 124. Compared with the conventional method of forming the valve body 125 and the valve seat 124 integrally, the operation of opening the valve port 121 is simpler and the valve port 121 is prevented from being displaced.

The sealing head 130 is received and fixed in the valve tube 110, and extends in the axial direction of the valve tube 110. The sealing head 130 is a hollow structure with two open ends. One end of the sealing head 130 abuts against one end of the valve seat 120 far away from the valve port 121 to communicate with the valve seat 120 to form a throttling channel 131. Specifically, the end surface of the end socket 130 abuts against the end surface of the valve body 125, and the seat body 124 is located at one end of the valve body 125 far away from the end socket 130.

Specifically, the end cover 130 abuts against the end of the valve seat 120 away from the valve port 121, and compared to the conventional case where the end cover 130 and the valve seat 120 are disposed in the valve tube 110 at an interval, a distance from the end of the end cover 130 away from the valve seat 120 to the end of the valve seat 120 where the valve port 121 is disposed is shorter, so that when the end cover 130 and the valve seat 120 are accommodated in the valve tube 110, a length of the valve tube 110 occupied by the end cover 130 and the valve seat 120 is reduced, and further, a length of the valve tube 110 can be reduced. Further, the length of the throttle valve 100 is made reducible, so that miniaturization of the throttle valve 100 is achieved.

The sealing head 130 and the valve tube 110 may be fixed by a fastener, a snap, an adhesive, or other means. Specifically, in this embodiment, one end of the sealing head 130 away from the valve seat 120 abuts against the first limiting portion 113 in the valve tube 110.

Therefore, the valve seat 120 and the valve tube 110 can be fixed with less fixing members, so as to reduce the production cost of the throttle valve 100.

Specifically, the first limiting portion 113 is an annular protrusion, one end of the sealing head 130, which is away from the valve seat 120, penetrates through the annular protrusion, and the outer diameter of the end of the sealing head 130, which is away from the valve seat 120, is gradually reduced along the direction from the valve seat 120 to the sealing head 130. Therefore, the first limiting portion 113 is an annular protrusion, and one end of the sealing head 130, which is away from the valve seat 120, penetrates through the annular protrusion, so that the first limiting portion 113 can clamp and fix the sealing head 130 in the circumferential direction of the sealing head 130, thereby preventing the sealing head 130 from sliding along the axial direction of the valve tube 110, and facilitating the improvement of the installation reliability of the sealing head 130.

In addition, the outer diameter of the end of the sealing head 130, which is far away from the valve seat 120, is gradually reduced along the direction from the valve seat 120 to the sealing head 130, so that the sealing head 130 can be conveniently inserted into the first limiting portion 113 and gradually clamped with the first limiting portion 113.

The opposite ends of the sealing head 130 are respectively abutted against the valve seat 120 and the first limiting portion 113, so that the sealing head 130 can be positioned and fixed.

Therefore, the opposite ends of the sealing head 130 are respectively abutted against the valve seat 120 and the first limiting portion 113, so that the positioning and fixing of the sealing head 130 can be realized.

The throttle assembly is received in the throttle channel 131. Therefore, the length of the throttling assembly overlaps with the length of the sealing head 130 and the valve seat 120, and the length of the sealing head 130, the valve seat 120 and the throttling assembly is only reduced to the length of the sealing head 130 and the valve seat 120, so that the occupied length of the sealing head 130, the valve seat 120 and the throttling assembly in the valve pipe 110 can be further reduced, the length of the throttling valve 100 is further reduced, and the throttling valve 100 is convenient to miniaturize.

Referring to fig. 3, specifically, the throttling assembly includes a valve needle 140 and an elastic member 150.

A valve needle 140 is slidably disposed through the valve port 121. Specifically, needle 140 includes a guide portion 141, a connecting portion 144, a tapered portion 142, and a needle portion 143, which are sequentially provided in the axial direction of valve tube 110. The guide portion 141 is closest to the outlet 112 and the needle portion 143 is closest to the inlet 111. The guide portion 141 and the connecting portion 144 are both cylindrical, but the outer diameter of the connecting portion 144 is larger than that of the guide portion 141. The tapered portion 142 is connected to the needle portion 143, the outer diameters of the tapered portion 142 and the needle portion 143 are gradually increased in the direction from the valve seat 120 to the closure 130, and the outer diameter of any position of the tapered portion 142 is larger than the outer diameter of the needle portion 143. The outer diameter of the connecting portion 144 is also larger than the outer diameters of the tapered portion 142 and the needle portion 143.

Specifically, the needle portion 143 and the cone portion 142 may be respectively clamped to the tapered mouth section 1213 and the flared mouth section 1212.

Valve needle 140 slides in the axial direction of valve tube 110, so that valve needle 140 can be inserted into valve port 121 or withdrawn from valve port 121.

Specifically, the valve needle 140 slides such that the needle portion 143 penetrates through the tapered opening section 1213 and is clamped with the tapered opening section 1213, and the tapered portion 142 penetrates through the flared end 1212 and is clamped with the flared end 1212. Alternatively, sliding of valve pin 140 may also cause needle portion 143 to withdraw from tapered section 1213 and tapered portion 142 to withdraw from flared section 1212. By providing the inner diameters of the flared section 1212 and the tapered section 1213 and the outer diameters of the tapered portion 142 and the needle portion 143 are gradually increased along the direction from the valve seat 120 to the end cap 130, the needle portion 143 and the tapered portion 142 can be conveniently inserted into the tapered section 1213 and the flared section 1212, respectively, and exit from the tapered section 1213 and the flared section 1212, respectively. Moreover, the flaring segment 1212 and the tapering segment 1213 are disposed at two ends of the seat body 124, so that when the valve needle 140 is inserted into the valve port 121, the seat body 124 can fix the throttle valve 100 at two positions of the valve needle 140, thereby making the installation of the valve needle 140 more stable.

In the present embodiment, when the tapered portion 142 and the needle portion 143 are inserted into the valve port 121, a gap exists between the needle portion 143 and the inner wall of the straight section 1211 and the tapered portion 142, so that the frictional force generated by the valve needle 140 sliding in the valve port 121 is reduced, and the wear rate of the valve needle 140 is reduced.

In the initial state, the needle 143 and the tapered portion 142 abut against the inner walls of the tapered end 1213 and the flared end 1212, respectively, and at this time, the valve port 121 is closed, and the throttle valve 100 does not have a flow rate regulating effect on the coolant. When the coolant is introduced from the inlet 111, the pressure of the coolant at the inlet 111 increases as the coolant accumulates, and the valve needle 140 is pushed to slide in a direction away from the valve seat 120, and the valve port 121 is gradually opened. The coolant enters the throttle passage 131 from the valve port 121 and flows out from the outlet 112. In the present embodiment, since the outer diameters of the tapered portion 142 and the needle portion 143 are gradually increased along the direction from the valve seat 120 to the end cap 130, the gaps between the needle portion 143 and the tapered portion 142 and the inner walls of the tapered section 1213 and the flared section 1212 are gradually increased during the sliding of the valve needle 140 in the direction away from the valve seat 120, the cross-sectional area through which the coolant can be introduced into the valve port 121 is increased, and the flow rate of the coolant entering the throttling channel 131 per unit time is also increased. The adjustment of the coolant flow rate is more diversified in the arrangement manner in the present embodiment than the case where the tapered portion 142 of the needle portion 143 is cylindrically arranged.

Opposite ends of the elastic member 150 are respectively abutted against the inner walls of the valve needle 140 and the sealing head 130. The elastic member 150 may provide an elastic restoring force to the valve needle 140 toward the valve port 121.

Specifically, the initial state of the elastic member 150 may be a compressed state or a natural extended state. Before the coolant is introduced into the inlet 111, the needle portion 143 and the tapered portion 142 are clamped to the tapered end section 1213 and the flared end section 1212, respectively.

When the inlet 111 is fed with coolant, the pressure of the coolant at the inlet 111 gradually increases, and the coolant may push the valve needle 140 to slide in a direction away from the valve seat 120. During the sliding of the valve needle 140, the cross-sectional area of the portion of the throttle bore 121 into which the coolant can be introduced increases, and the flow rate of the coolant also increases. And the valve needle 140 slides, so that the elastic member 150 is gradually compressed, and the elastic restoring force applied to the valve needle 140 is gradually increased. When the needle 143 and the tapered part 142 completely exit the valve port 121, the flow rate of the coolant supplied to the throttle valve 100 is maximized, and the compression amount of the elastic member 150 is also maximized.

When the flow rate of the coolant needs to be reduced, the input amount of the coolant at the inlet 111 can be reduced so that the pressure of the coolant is reduced. In turn, the elastic restoring force of the elastic member 150, which pushes the valve needle 140 to slide in a direction toward the valve seat 120, is greater than the pressure of the coolant, so that the cross-sectional area of the portion of the valve port 121 that can be open to the coolant is reduced. Finally, the valve port 121 reseals when the cone portion 142 and the needle portion 143 re-engage the cone section 1213 and the flared section 1212, respectively.

By providing the elastic member 150, the elastic restoring force applied by the elastic member 150 to the valve needle 140 can prevent the valve needle 140 from sliding in the direction away from the valve seat 120, so that the sliding of the valve needle 140 is slower, and therefore, the change rate of the cross-sectional area of the portion of the valve port 121 that can be accessed by the coolant per unit time is lower, and the precision of the coolant flow adjustment is higher. On the other hand, the elastic force exerted by the valve needle 140 may also drive the valve needle 140 to slide in a direction towards the valve seat 120, so that the valve needle 140 may automatically realize the sealing of the valve port 121. Moreover, when the inlet 111 stops inputting the coolant, the valve needle 140 may also slide in the direction toward the valve seat 120 by the elastic member 150 until the tapered portion 142 abuts the flared section 1212 and the needle portion 143 abuts the tapered section 1213. Specifically, the elastic member 150 may be a compression spring, an elastic silicone rubber, or an elastic member 150 made of other elastic materials.

In the present embodiment, the elastic element 150 is a compression spring, and one end of the elastic element 150 is sleeved at one end of the valve needle 140 away from the valve port 121, specifically, one end of the elastic element 150 is sleeved at the guiding portion 141 of the valve needle 140 and abuts against the connecting portion 144. The other end of the elastic member 150 is received in the sealing head 130.

By providing the elastic member 150 as a compression spring, the elastic member 150 can always apply an elastic restoring force to the valve needle 140 toward the valve port 121. Therefore, when the freeze cycle system is closed, under the action of the elastic restoring force, the contact between the needle portion 143 and the hole wall of the tapered mouth section 1213 and the contact between the tapered portion 142 and the hole wall of the flared mouth section 1212 are tighter, so as to prevent the valve needle 140 from being pulled out of the valve port 121 when the freeze cycle system is not in operation, which may result in abnormal operation of the throttle valve 100.

One end of the elastic member 150 is fitted over the guide portion 141 of the needle 140, and the other end of the elastic member 150 is accommodated in the interior of the cap 130. The guiding portion 141 and the inner wall of the sealing head 130 support and guide the compression and recovery of the elastic member 150, so as to prevent the elastic member 150 from shaking violently during the compression and recovery process.

In this embodiment, the throttle valve 100 further comprises a filter member 160, and the filter member 160 is received and fixed in the valve pipe 110 and aligned with the valve port 121. The filter member 160 extends in the axial direction of the valve tube 110.

The filter member 160 is received and fixed in the valve tube 110 and spaced apart from the valve seat 120. The coolant supplied from the inlet 111 is filtered by the filter member 160 and supplied to the valve port 121.

The filter member 160 serves to filter the coolant introduced from the inlet 111 to prevent the coolant from being clogged with impurities, which may cause the throttling passage 131 and the outlet 112 of the valve tube 110.

In particular, the filter element 160 may be a filter, a mesh, or other filtering device. In the present embodiment, the filter 160 has a hollow cylindrical structure and extends in the axial direction of the valve tube 110. The side wall of the filter member 160 is provided with filter meshes.

Specifically, the filter member 160 is formed by a filter mesh enclosure. The end faces of the two ends of the filter member 160 are aligned with the valve ports 121, respectively. Therefore, the coolant may sequentially pass through both end faces of the filter member 160 to perform secondary filtration. It should be noted that in other embodiments, the filter element 160 may have a hollow structure with one end open. The open end may face toward or away from the valve port 121.

The filter member 160 is fixed by a fixing member or a retaining member when the filter member 160 is installed in the valve tube 110, and in this embodiment, the filter member 160 is retained with the valve tube 110.

Therefore, the filter member 160 can be fixed in the valve tube 110 without using a fixing member, so that the use of parts can be reduced.

Further, in the present embodiment, the outer wall of the filter element 160 is recessed to form an annular limiting groove 161, the third limiting portion 115 is an annular protrusion, and the annular gas is held in the limiting groove 161, so that the valve tube 110 can fix the filter element 160 from the circumferential direction of the filter element 160, thereby preventing the filter element 160 from sliding along the axial direction of the valve tube 110, and facilitating the reliability of the installation of the filter element 160.

In the refrigeration cycle system and the throttle valve 100 thereof, one end of the sealing head 130 abuts against one end of the valve seat 120 far away from the valve port 121, and the length occupied by the sealing head 130 and the valve seat 120 in the valve pipe 110 is smaller compared with the arrangement that the sealing head 130 and the valve seat 120 are arranged at an interval. Further, the throttling assembly is accommodated in the throttling channel 131, so that the length of the throttling assembly is equal to or longer than the length of the sealing head 130 and the valve seat 120, and the length of the sealing head 130, the length of the valve seat 120 and the length of the throttling assembly are only reduced to the length of the sealing head 130 and the length of the valve seat 120, so that the occupied length of the sealing head 130, the occupied length of the valve seat 120 and the length of the throttling assembly in the valve pipe 110 can be further reduced, the length of the throttling valve 100 is smaller, and the throttling valve 100 is convenient to miniaturiz.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A throttle valve, comprising;

the valve pipe is of a hollow structure;

the valve seat is accommodated and fixed in the valve pipe and is of a hollow structure, and one end of the valve seat is provided with a valve port;

the end socket is accommodated and fixed in the valve pipe and is of a hollow structure with two open ends, and one end of the end socket is abutted against one end of the valve seat far away from the valve port so as to be communicated with the valve seat to form a throttling channel; and

the throttling assembly is accommodated in the throttling channel.

2. The throttling valve according to claim 1, wherein a first limiting part is arranged on the inner wall of the valve pipe, and one end, away from the valve seat, of the sealing head is abutted against the first limiting part.

3. The throttling valve according to claim 2, wherein the first limiting part is an annular protrusion, one end of the seal head, which is far away from the valve seat, penetrates through the annular protrusion, and the outer diameter of one end of the seal head, which is far away from the valve seat, is gradually reduced along the direction from the valve seat to the seal head.

4. The throttling valve according to claim 2, wherein the inner wall of the valve pipe is provided with a second limiting part, the outer wall of the valve seat forms a matching part, and the matching part is matched and fixed with the second limiting part.

5. The throttling valve of claim 4, wherein the first position-limiting portion is an annular protrusion and the mating portion is a slot.

6. The throttling valve according to claim 1, wherein the throttling assembly comprises a valve needle and an elastic member, the valve needle is slidably disposed through the valve port, two opposite ends of the elastic member are respectively abutted against the inner walls of the valve needle and the sealing head, and the elastic member provides an elastic restoring force for the valve needle, which is directed to the valve port.

7. The throttling valve according to claim 6, wherein the elastic member is a compression spring, one end of the elastic member is sleeved on one end of the valve needle far away from the valve port, and the other end of the elastic member is accommodated in the sealing head.

8. The throttling valve of claim 7, wherein the valve seat comprises a valve body and a seat body provided with a valve port, one end of the valve body is abutted against the sealing head, and the seat body is clamped in the valve body and is positioned at one end of the valve body far away from the sealing head.

9. The choke valve according to claim 1, further comprising a filter element extending axially along the valve tube, the filter element being received and secured within the valve tube and aligned with the valve port location.

10. A refrigeration cycle system comprising a throttle valve as claimed in any one of claims 1 to 9.

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