CN110844315A

CN110844315A - Spray pump head

Info

Publication number: CN110844315A
Application number: CN201911291136.1A
Authority: CN
Inventors: 沈利庆
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-24
Filing date: 2019-12-16
Publication date: 2020-02-28
Also published as: CN110053862A

Abstract

The invention relates to a spray pump head capable of controlling spray pressure to be uniform, which consists of a pump core, a middle cover and a nozzle head, wherein the pump core comprises a pump core main body, an upper piston, a reverse push plug, a sealing ring and the like; the center of the piston is provided with a connecting groove, the lower cavity is connected with the upper cavity through the connecting groove, and the tail end of the connecting groove is provided with a damping hole. The cross-sectional area of the bottom of the upper cavity is larger than that of the top of the lower cavity; a pressure relief hole is arranged in a lower cavity of a pump core main body, and a pressure relief groove is arranged in the lower half section of the lower cavity. The spraying pressure of the device is not affected by the speed of finger action and strength, and the device can stably realize better spraying effect and avoid the phenomenon of water flowing at the nozzle opening.

Description

Spray pump head

Technical Field

The invention relates to the field of household articles, in particular to a spray pump head capable of controlling spray pressure to be uniform.

Background

In the field of household articles such as cosmetics, washing articles, plant planting and the like, the spray pump head is a very common and very good auxiliary accessory for a liquid container. The liquid sprayer is used for spraying the liquid in a bottle in a pressing mode to enable the mixed fluid of air and the liquid to be sprayed out from the tiny micropores at high pressure. Because the pressure near the small hole is small, the air pressure above the liquid level in the container is strong, the liquid rises along the thin tube below the small hole, flows out from the upper opening of the thin tube, is impacted by the airflow, and is diffused in the air in a spray mode to form small-particle air suspended matters.

The prior mature spray pump head is internally provided with a novel spray pump mechanism as a patent No. CN201521117894.9, which comprises a lock bottle cap, a pump body mounting part is arranged at the upper end of the lock bottle cap, a pump chamber is arranged in the pump body mounting part, a liquid inlet is arranged at the lower end of the pump chamber, a pump bead is arranged in the liquid inlet, an upper pump rod is arranged in the pump chamber, the upper end of the upper pump rod extends out of the pump chamber, the upper end of the upper pump rod is connected with a button, a liquid spraying channel is arranged in the button, a fog point is arranged on the button and is communicated with the liquid spraying channel, the outer wall of the lower part of the upper pump rod is provided with a positioning ring platform, the upper end of the pump chamber is provided with a locking cover, a lower pump rod is movably connected in the upper pump rod, a suction plug is arranged between the upper pump rod and the lower pump rod, an auxiliary spring is, an outer cover is sleeved outside the convex connecting ring.

The spray pressure of such a spray pump is entirely dependent on the finger pressure applied to the button, the greater the pressure applied, the greater the spray pressure. The pressure and the action of the hand-press pump head are divided into light weight and speed, so that the spraying effect is poor, and the formed atomization is unstable. When the hand-pressing pump head is light, even the undesirable phenomena of water drops directly flowing out of the nozzle and the like occur, and the spraying effect is poor.

For another example, CN201710844435.8, "a high-efficiency atomizer pump head structure" discloses a high-efficiency atomizer pump head structure, which includes a pump core, a pressing cover and a tooth cover; the pump core is coaxially arranged on the inner side of the tooth cover; the gland is movably arranged on the tooth cover, and the spray nozzle of the gland is communicated with the liquid outlet of the pump core; the pump core comprises a pump shell, an upper valve and a main piston, wherein a liquid inlet is formed in the lower end of the pump shell, and a one-way valve opened by negative pressure is further arranged at the liquid inlet; the lower section of the main piston is a cylinder, the lower end of the cylinder can be movably inserted into a shell cavity of the pump shell up and down, a valve column is arranged in the cylinder, and the outer wall of the valve column is integrally connected with the inner wall of the cylinder through a connecting part; the pump core is divided into two areas by arranging an upper channel and a lower channel between an upper valve and a main piston, the two areas are connected through a through hole arranged on the main piston, pressure difference is generated by utilizing different liquid contact areas between the upper channel and the lower channel, and when the pressure difference is greater than a certain preset value, a valve column at the center of the main piston is separated from a closed opening of the upper valve, so that high-pressure liquid in the upper channel is sprayed to form atomization.

However, the pump core has some defects, the structure of the first upper channel is small, the liquid flowing speed between the upper channel and the lower channel is high, after the pressure in the upper channel is released, the liquid in the lower channel quickly goes upwards to supplement the pressure in the upper channel, the pressure difference between the upper channel and the lower channel is generated, the spray can be formed again, and when people do not need the spray, a small amount of spray or overflow can influence the use feeling of people.

Second, its lower passageway is pressing down the biggest stroke after, and the inner chamber can keep higher pressure, loosens finger pressure this moment, and the in-process that the spring resets, this pressure still can exert pressure to the inlet pump pearl of pump core lower extreme, influences inlet speed and feed liquor volume for the pump core resets the back liquid is difficult for filling completely, can sneak into a small amount of air. Since the liquid is heavier relative to the air, the liquid sinks in the lower channel and the gas enters the upper channel. Therefore, after the pump core is placed for a long time, the pump core has less fog output when spraying for the first time, and even can not generate fog, so that the use feeling is influenced.

Disclosure of Invention

The invention aims to solve the technical problem of providing an efficient atomizing spray pump head, the spray pressure of which is not influenced by the speed of finger action and the strength of finger action, better spray effect can be stably realized, the overflow phenomenon of a nozzle opening is avoided, the problems can be better solved, and more comfortable spray experience is provided for users.

The technical scheme adopted by the invention for solving the problems is as follows: a spray pump head with balanced spray pressure comprises a pump core, a middle cover and a nozzle head, wherein the pump core is fixed in the center of the middle cover, the nozzle head is arranged on the upper side of the middle cover and moves up and down relative to the middle cover, and the upper end of the pump core is connected with the nozzle head through a spray channel; the pump core comprises a pump core main body, an upper piston, a reverse push plug and a sealing ring, wherein the pump core main body is of a cylindrical structure of a hollow barrel with a multilayer stepped structure, the pump core main body is in sliding fit with the upper piston and the reverse push plug, and the reverse push plug is limited between the pump core main body and the upper piston; the reverse push plug and the lower half part of the pump core main body form a lower cavity, an elastic component is arranged below the reverse push plug, a steel ball is arranged at the bottom of the elastic component, and the elastic component, the steel ball and a conical liquid inlet pipe at the bottom of the pump core main body form a one-way valve; the method is characterized in that: an upper cavity is formed between the reverse push plug and the upper piston, the reverse push plug is arranged in the center of the upper part of the reverse push plug, the top of the reverse push plug is a cone, a circular table surface is arranged in the center of the upper piston, and the circular table surface is matched with the cone of the reverse push column to form a reverse one-way valve; the center of the piston is provided with a connecting groove, the lower cavity is connected with the upper cavity through the connecting groove, and the tail end of the connecting groove is provided with a damping hole.

The cross-sectional area of the bottom of the upper cavity is larger than that of the top of the lower cavity.

A pressure relief hole is formed in the lower cavity of the pump core main body, and a pressure relief groove is formed in the lower half section of the lower cavity.

The middle cover is in threaded fit with the pump core main body.

Further, the circular table surface at the center of the upper piston is close to the bottom of the upper piston.

A movable sealing ring is arranged between the upper piston and the reverse thrust plug; the movable closed ring consists of an inner ring positioned on the upper piston and an outer ring positioned on the lower piston, and the outer ring and the inner ring are in sliding fit.

The bottom of the piston skin of the upper piston is provided with a conical notch, when the upper piston and the reverse push plug are mutually extruded, the top of the piston skin of the reverse push plug is extruded by the conical notch to expand outwards, and the piston of the reverse push plug is tightly matched with the pump core main body; when the upper piston and the reverse plug are not mutually extruded, the piston skin of the reverse plug is loosely matched with the pump core main body.

The pump core main body is provided with an air pressure balancing hole which is communicated with the air in the liquid bottle.

Compared with the prior art, the invention has the advantages that:

firstly, a set of reverse one-way valve structure is added in a pump core of the existing spraying pump head, the reverse one-way valve consists of a reverse push plug and a circular table surface positioned in a connecting column, and when a finger presses a nozzle head downwards and the pressure in an upper cavity does not reach the preset pressure, the reverse one-way valve cannot be opened.

Only when the pressure difference between the pressure in the upper cavity and the pressure difference in the lower cavity is greater than the preset pressure, the reverse thrust plug integrally sinks, so that the reverse one-way valve at the top of the upper cavity is opened, the pressure in the upper cavity is already large at the moment, and the spraying effect is good.

When the pressure of the upper cavity is reduced, the return spring in the lower cavity pushes the reverse push plug to move upwards to close the reverse one-way valve, and water in the upper cavity enters the pressure relief cavity due to the instantaneous pressure generated by the return of the spring. Because the liquid with lower pressure is sealed in the chamber and does not enter the nozzle head any more, the dripping phenomenon of the nozzle head caused by lower pressure can be avoided.

And secondly, the piston is controlled by only one set of elastic component, and two sets of elastic component structures are not needed, so that fewer parts are needed, and the processing is convenient.

And thirdly, the pressure difference between the upper cavity and the lower cavity is controlled and formed through a connecting groove in the center of the reverse thrust plug and a damping hole arranged at the tail end of the connecting groove.

Four, it has set up pressure release groove and pressure release hole, and at the end of compression stroke, can release the fluid pressure of intracavity down rapidly, helps the spring to reset, and gaseous lower intracavity cohesion of pump head is avoided through the mode of quick pressure release to this structure also, influences the spraying effect after placing for a long time.

Drawings

Fig. 1 is an external view of the invention.

Fig. 2 is a sectional view a-a in fig. 1.

Fig. 3 shows the structure of the pump cartridge (rest state).

Fig. 4 is a block diagram of a first process of the pump cartridge.

Fig. 5 is a block diagram of a second process of the pump cartridge.

Fig. 6 is a block diagram of a third process of the pump cartridge.

Fig. 7 is an enlarged view of the pressure relief groove.

Fig. 8 is an enlarged view of a damper hole and coupling groove portion.

Fig. 9 is a structural diagram of design two.

Fig. 10 is a block diagram of a design of two resting states.

Fig. 11 is a partially enlarged view of fig. 10 at B.

FIG. 12 is a structural view showing a second liquid discharge state.

Fig. 13 is a partial enlarged view of fig. 12 at C.

Fig. 14 is a structural view of the second design in a pressure relief state.

Fig. 15 is a partial enlarged view of fig. 14 at D.

The pump comprises a pump core 1, a middle cover 2, a nozzle head 3, a pump core main body 11, an upper piston 12, a reverse push plug 13, a sealing ring 14, an elastic component 15, a steel ball 16, a cone 17, a circular table top 18, a damping hole 19, a pressure relief hole 20, a pressure relief groove 21, an upper cavity 22, a lower cavity 23, a connecting groove 24, a movable sealing ring outer ring 25, a movable sealing ring outer ring inner ring 26, a movable sealing ring outer ring 27, an outer cavity 28, a conical notch 29, a pressure relief cavity 30, an air pressure balance hole 31 and an air pressure balance cavity 31.

Detailed Description

Embodiments of the present invention are further described below with reference to the accompanying drawings.

The invention relates to an efficient spray pump head. As shown in figure 1, the pump core consists of a pump core 1, a middle cover 2 and a nozzle head 3, wherein the pump core is fixed in the center of the middle cover, the nozzle head is arranged on the upper side of the middle cover and moves up and down relative to the middle cover, the upper end of the pump core is connected with the nozzle head through a spraying channel, and the lower part of the pump core extends into the liquid level of a bottle cavity through a hose.

As shown in fig. 2, the pump core comprises a pump core main body 11, an upper piston 12, a reverse thrust plug 13, a sealing ring 14 and the like, wherein the pump core main body is a hollow cylindrical structure with a multilayer stepped structure, the pump core main body is in sliding fit with the upper piston and the reverse thrust plug, and the reverse thrust plug is limited between the pump core main body and the upper piston; the lower cavity 23 is formed by the reverse push plug and the lower half part of the pump core main body, the elastic component 15 is arranged below the reverse push plug, the steel ball is arranged at the bottom of the elastic component, the elastic component 15, the steel ball 16 and the conical liquid inlet pipe at the bottom of the pump core main body form a one-way valve, and the one-way valve structure can prevent liquid entering the lower cavity from flowing back into the bottle body under the action of gravity. The liquid bottle is not shown in the figure. The reverse push plug, the upper piston and the working part of the pump core main body jointly form an upper cavity 22, the center of the upper part of the reverse push plug is provided with the reverse push plug, the top of the reverse push plug is a cone 17, the center of the upper piston is provided with a circular table surface 18, and the circular table surface is matched with the cone of the reverse push plug to form a reverse single valve; the bottom center of the reverse push plug is provided with a connecting groove 24, the lower cavity is connected with the upper cavity through the connecting groove, the tail end of the connecting groove is provided with a damping hole 19, the connecting groove allows liquid in the lower cavity to go up to the damping hole, the cross section area of the damping hole is less than one tenth of that of the connecting groove, and the upper cavity are prevented from fast flowing back to the lower cavity.

The cross-sectional area of the bottom of the upper chamber 22 is larger than the cross-sectional area of the top of the lower chamber 23. The difference in area between the top and bottom will result in a pressure at the bottom of the upper chamber that is greater than the pressure at the top of the lower chamber at the same pressure. In the process of compressing the pump core, the pressure of the upper cavity and the lower cavity cannot be rapidly balanced due to the existence of the damping holes, and the pressure of the upper cavity can be rapidly higher than that of the lower cavity.

A pressure relief hole 20 is arranged in the lower cavity of the pump core main body, and a pressure relief groove 21 is arranged in the lower half section of the lower cavity.

Above-mentioned well lid and pump core main part screw-thread fit make things convenient for the pump core main part to fix and cover in to be connected with the bottle of splendid attire liquid through well lid.

The resilient member 15 below the thrust plug is a spring.

In a static state, as shown in fig. 3, under the action of the gravity of the steel ball, the steel ball and the conical liquid inlet pipe at the bottom of the pump core main body form a one-way valve for sealing, and the bottom of the spring limits the steel ball to prevent the steel ball from falling off. The bottom of the spring is pressed on the step, the top of the spring upwards jacks the reverse thrust plug, and the cone at the top of the reverse thrust plug is matched with the circular table surface of the upper piston to form the reverse one-way valve. Under the action of the spring, the reverse check valve is also closed. As the spring returns, the volume of the lower chamber increases and the pressure decreases, drawing water from the bottle body along the straw. Because the upper cavity is communicated with the lower cavity through the connecting groove and the damping hole, the upper cavity is filled with liquid.

The action after pressing down the spray pump head is divided into three processes:

in the first process, as shown in fig. 4, when a finger presses a nozzle head, a connecting column is pressed to move downwards, a cone part of a reverse push plug is contacted with a circular truncated cone part of the connecting column, the pressure of an upper cavity and the pressure of a lower cavity are both small, the connecting column drives a piston to move downwards, the volumes of the upper cavity and the lower cavity are compressed at the same time, the pressure is greater than the elastic force of a spring, the spring starts to tighten, a steel ball is pressed, a check valve at the bottom of the lower cavity is sealed.

In the second process, as shown in fig. 5, as the fingers continue to press the nozzle, the connecting column continues to move downwards, the pressure in the upper cavity gradually increases, because the diameter of the bottom of the upper cavity is larger than that of the top of the lower cavity, the pressure in the upper cavity increases faster than that in the lower cavity, and because of the existence of the damping hole, the pressure in the upper cavity cannot be rapidly transmitted to the lower cavity, so that the pressure in the upper cavity is larger than that in the lower cavity, the spring is further compressed, and the downward speed of the reverse plug is faster than that of the upper piston. The cone of the reverse push plug in the upper cavity is separated from the circular table surface of the upper piston, namely the reverse one-way valve is opened, the upper cavity is communicated with the nozzle head, and the high-pressure liquid is rapidly decompressed through the nozzle head to generate an atomization effect.

Third, as shown in FIG. 6, when the finger further depresses the nozzle, the high pressure liquid in the upper chamber rapidly drains out of the reverse check valve; when the pressure of the upper cavity and the pressure of the lower cavity are close to balance, the spring pushes the reverse pushing plug reversely, so that the piston moves upwards, the reverse one-way valve moves upwards, and an outlet at the top of the upper cavity is sealed. The reverse thrust plug continues to descend, the piston of the reverse thrust plug descends below the pressure relief groove of the pump core main body, the liquid pressure in the lower cavity rapidly passes through a gap outside the reverse thrust plug piston from the pressure relief groove and reaches the pressure relief hole of the pump core main body, the pressure is relieved from the pressure relief hole, and the pressure of the lower cavity is recovered.

When the fingers loosen the nozzle head, the spring pushes the reverse push plug and the upper piston to move upwards, negative pressure occurs in the lower cavity and the upper cavity, the one-way valve at the bottom of the lower cavity is opened, and the lower cavity of the pump core sucks liquid. And in the process of the upward movement of the back-pushing plug, the pressure relief groove is closed. After the upper cavity passes through the connecting groove and the damping hole is filled with liquid, the state of the figure 3 is restored.

The invention has the advantages that firstly, the volume of the upper cavity is increased, and through the design of the damping holes between the upper cavity and the lower cavity, the liquid in the upper cavity is sprayed out during high-speed spraying, and the liquid in the lower cavity cannot rapidly enter the upper cavity, so that the phenomenon that the pressure of the upper cavity rises too fast to cause secondary spraying is avoided.

And secondly, a pressure relief structure of the lower cavity is added, and through the design of the pressure relief groove and the pressure relief hole, redundant high-pressure liquid in the lower cavity is allowed to be discharged through the pressure relief hole when the nozzle descends to the maximum stroke, so that the pressure of the lower cavity is reduced. The liquid inlet one-way valve above the suction pipe is prevented from being opened difficultly when the pressure of the lower cavity is higher. The liquid is more smoothly sucked by the pump core through the suction pipe.

And the upper cavity is communicated with the lower cavity through a damping hole, and the liquid in the lower cavity slowly flows into the upper cavity, so that the phenomenon that the pressure in the upper cavity is increased too fast to cause the reverse check valve to be opened is avoided, and the phenomena of water overflow and water seepage of a nozzle opening can be effectively avoided.

Further, the implementation of the above scheme has the following disadvantages: when the finger is released, the return member spring pushes the reverse plug upwards, and the pressure in the upper chamber rises, causing the upper piston port of the cone 17 to be opened for a short period of time, causing a small number of droplets to flow out of the spray outlet.

In order to solve the problem, in the second design, when the spring is reset, the design that the water pressure of the upper cavity can be quickly discharged is made. The design includes the following two parts.

1. The height of the cone is reduced, and because the water level on the two sides of the upper cavity is higher than the circular table surface 18 of the cone, when the spring is reset from a compressed state, the upper cavity can be closed more quickly, and the possibility of liquid flowing out of the spray nozzle is reduced.

2. A pressure relief channel is established in the upper cavity, and the high pressure generated after the pressure in the upper cavity is pressed is relieved. The channel consists of a movable closed ring, a pressure relief cavity and a mechanism for controlling the pressure relief of the reverse plug. In particular, the inner ring 26 of the mobile closing ring is arranged on the upper piston and the outer ring 25 is arranged on the counterpiston. When the upper piston is pressed, the pressure in the upper cavity is increased, the inner ring and the outer ring of the movable sealing ring are dislocated, and a channel which enters the pressure relief cavity from the upper cavity is established. And at the moment, the piston skin of the reverse push plug is influenced by the conical cut of the upper piston and is expanded outwards to seal a channel from the pressure relief cavity to the outer cavity. Therefore, the high-pressure water in the upper cavity enables the conical head of the cone to leave the circular table surface 18 of the upper piston, the reverse one-way valve is opened, and the liquid reaches the spray nozzle from the upper cavity to be sprayed out; on the other hand, as the pressure in the upper cavity rises, the distance between the upper piston and the reverse push plug is increased, so that the movable sealing ring is closed, and a gap channel from the upper cavity to the pressure relief cavity is cut off. As shown in fig. 12 and 13. When this structure had guaranteed the spraying, the liquid of going up the intracavity can only pass through the nozzle blowout, can not enter into the pressure release intracavity.

When the finger is released and the spring is reset, the reverse push plug pushes the upper piston to reset, the movable sealing ring is opened, the liquid in the upper cavity flows into the pressure relief cavity, and the pressure in the upper cavity is reduced. When the pressure in the pressure relief cavity is too high, the space between the upper piston and the reverse push plug is expanded, the piston skin of the reverse push plug exits from the conical notch of the upper piston to form a loose fit structure, water in the pressure relief cavity enters the outer cavity along the gap and then flows back into the bottle through the pressure relief hole 20, and therefore the pressure in the pressure relief cavity is reduced. As shown in fig. 14 and 15.

Therefore, when the spring is reset and the reverse push plug is pushed to move upwards, the movable closing ring is firstly opened due to overhigh pressure of the upper cavity, and the upper cavity is firstly decompressed to the pressure relief cavity. When the pressure in the pressure relief cavity continues to rise, the piston skin of the reverse push plug leaves the conical notch of the upper piston to form loose fit, and the liquid in the pressure relief cavity is relieved to the outer cavity 27 along the piston skin gap of the reverse push plug. The water in the outer cavity flows back to the bottle from the pressure relief hole 20.

The design can ensure that when the spring is reset, the pressure in the upper cavity is always lower than the pressure of the circular table top for opening the cone, and the liquid in the upper cavity cannot overflow from the spray nozzle.

Further, in order to avoid the reduction of liquid in the bottle and the reduction of air pressure along with spraying, the design II is additionally provided with an air pressure balance hole and an air pressure balance cavity, when the spring is reset, the upper piston moves upwards, and air is sucked from the top of the upper piston to enter the air pressure balance cavity 31. When the piston is pressed, the air in the air pressure balancing cavity enters the bottle body along the air pressure balancing hole 30, and the air pressure loss generated by liquid outflow is compensated.

The invention is a spray pump head structure with better stability and uniform spray pressure, which has good spray effect, constant spray pressure and no liquid overflow at the spray nozzle, is a high-quality spray pump head design and can be widely used in the fields of household, medical treatment and cosmetics.

Claims

1. A spray pump head comprises a pump core (1), a middle cover (2) and a nozzle head (3), wherein the pump core is fixed in the center of the middle cover, the nozzle head is arranged on the upper side of the middle cover and moves up and down relative to the middle cover, and the upper end of the pump core is contacted with the nozzle head; the pump core comprises a pump core main body (11), an upper piston (12), a reverse thrust plug (13) and a sealing ring, wherein the pump core main body is of a hollow cylindrical structure with a multilayer stepped structure, the pump core main body is in sliding fit with the upper piston and the reverse thrust plug, and the reverse thrust plug is limited between the pump core main body and the upper piston; the reverse push plug and the lower half part of the pump core main body form a lower cavity (23), an elastic component (15) is arranged below the reverse push plug, a steel ball (16) is arranged at the bottom of the elastic component, and the elastic component, the steel ball and a conical liquid inlet pipe at the bottom of the pump core main body form a one-way valve; the method is characterized in that: an upper cavity (22) is formed between the reverse push plug and the upper piston, the reverse push plug is arranged in the center of the upper part of the reverse push plug, a cone (17) is arranged at the top of the reverse push plug, a circular table surface (18) is arranged in the center of the upper piston, and the circular table surface is matched with the cone of the reverse push column to form a reverse single valve; the center of the piston is provided with a connecting groove, the lower cavity is connected with the upper cavity through the connecting groove, and the tail end of the connecting groove is provided with a damping hole.

2. A spray pump head according to claim 1, wherein: the cross-sectional area of the bottom of the upper cavity (22) is larger than that of the top of the lower cavity (23).

3. A spray pump head according to claim 1, wherein: a pressure relief hole (20) is formed in the lower cavity of the pump core main body.

4. A spray pump head according to claim 1, wherein: the circular table surface (18) at the center of the upper piston (12) is close to the bottom of the upper piston (12).

5. A spray pump head according to claim 1, wherein: a movable closed ring is arranged between the upper piston (12) and the reverse thrust plug (13); the movable closing ring is composed of an inner ring (26) positioned on the upper piston and an outer ring (25) positioned on the lower piston, and the outer ring and the inner ring are in sliding fit to establish a channel from the upper cavity to the pressure relief cavity.

6. A spray pump head according to claim 1, wherein: the bottom of the piston skin of the upper piston (12) is provided with a conical notch (28), when the upper piston and the reverse push plug are mutually extruded, the top of the piston skin of the reverse push plug is extruded by the conical notch to expand outwards, and the piston of the reverse push plug is tightly matched with the pump core main body; when the upper piston and the reverse plug are not mutually extruded, the piston skin of the reverse plug is loosely matched with the pump core main body.

7. A spray pump head according to claim 1, wherein: the pump core main body (11) is provided with an air pressure balancing hole (30) which is communicated with the gas in the liquid bottle.